Дисертації з теми "Dental restoration permanent"
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Wallman, Catarina. "On mutans streptococci in margins of restorations." Göteborg, [Sweden] : Dept. of Cariology, Faculty of Odontology, Göteborg University, 1994. http://catalog.hathitrust.org/api/volumes/oclc/32080686.html.
Повний текст джерелаTeitelbaum, Heather K. Walker Mary P. "Effects of simulated functional loading conditions on dentin, composite, and laminate structures." Diss., UMK access, 2007.
Знайти повний текст джерела"A dissertation in oral biology and engineering." Advisor: Mary P. Walker. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed July 30, 2008. Includes bibliographical references (leaves 110-126). Online version of the print edition.
Trentin, Élcio Ferreira 1967. "Análise do custo de materiais utilizados em restaurações dentárias posteriores diretas em resina composta." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290801.
Повний текст джерелаDissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O custo dos materiais faz parte do cálculo do valor dos honorários odontológicos. As resinas compostas são materiais usualmente utilizados em restaurações dentárias diretas de dentes posteriores. O objetivo desse trabalho foi determinar o valor total do custo dos materiais diretos e indiretos utilizados em restaurações de dentes posteriores em resina composta. O cálculo dos custos foi baseado no método de sistema de custeio variável. As repetições foram obtidas de preparos classes I e II em dentes pré-molares e molares artificiais. A lista dos materiais foi obtida por meio de consulta a uma banca de juízes e baseada nos padrões de excelência comprovados na literatura. Os valores dos materiais foram obtidos de uma média dos valores consultados no mercado fornecedor. Os materiais foram quantificados para cada tipo de preparo com uso de balança de precisão. Os dados foram avaliados por estatística descritiva e pelos testes de Mann-Whitney e Kruskal-Wallis. A análise foi feita para os materiais utilizados em biossegurança (Capítulo 1) e para a realização da restauração (Capítulo 2). O custo encontrado para a biossegurança foi de R$ 8,85. Para os demais materiais para restauração de Classe I foi de R$ 8,69 e para a de Classe II de R$ 8,86. Não houve diferença estatística no custo entre os tipos de preparos para restauração, sendo a média total dos materiais de R$ 17,63. Os valores encontrados podem ser utilizados no cálculo do valor final do procedimento restaurador, auxiliando na gestão de serviços odontológicos públicos ou privados
Abstract: The cost of the materials is part of the calculation of the value of dental fees. The composite resins are materials commonly used in direct posterior dental restorations. The aim of this study was to determine the total value of the cost of the direct and indirect materials used in composite resin posterior dental restorations. The calculation of costs was based on the method of variable costing system. The repetitions were obtained from classes I and II cavities in artificial premolars and molars teeth. A list of the materials was obtained by an experts panel and based on the excellence standards established in the literature. The values of the materials were obtained from an average of the values founded in the supplier market. The materials were quantified for each type of cavity with the use of precision balance. The data were assessed by descriptive statistics and by Mann-Whitney and Kruskal-Wallis tests. The analysis was performed for the materials used in biosafety (Chapter 1) and on the restoration (Chapter 2). The founded cost (Brazilian current coin) was R$8.85 for biosafety. The others materials for Class I restorations was R$8.69 and for Class II restorations was R$ 8.86. There was no statistically significant difference in cost between the types of cavities, with an average of total materials of R$ 17.63. These values might be used in the calculation of the final value of the restorative procedure, aiding in the management of public or private dental care services
Mestrado
Mestre em Odontologia em Saúde Coletiva
Felber, Leo. "Automatische Verfahren zur Konstruktion von Inlays in der computergestützten Zahnrekonstruktion /." [S.l.] : [s.n.], 1996. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11648.
Повний текст джерелаRagain, James Carlton. "Matching the optical properties of direct esthetic dental restorative materials to those of human enamel and dentin." The Ohio State University, 1998. http://catalog.hathitrust.org/api/volumes/oclc/48036279.html.
Повний текст джерелаAdvisor: William M. Johnson, Oral Biology Program. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
Hernandes, da Fonseca Natália Maria Aparecida 1986. "Influência da espessura da resina de baixa viscosidade e da técnica restauradora na infiltração marginal em restaurações realizadas com compósito dental /." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288870.
Повний текст джерелаDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo deste estudo in vitro foi avaliar quantitativamente a infiltração marginal ao redor de restaurações dentais, realizadas com compósito resinoso microhíbrido, variando a espessura, a resina de baixa viscosidade e a técnica restauradora. As superfícies proximais de cento e trinta incisivos bovinos foram preparadas e divididas de acordo com a resina de baixa viscosidade (Filtek Z350 Flow - Z350F e SureFil®SDRTM Flow - SUR), espessura da resina de baixa viscosidade (0,5 mm, 1,0 mm ou 2,0 mm) e técnica restauradora (resina de baixa viscosidade aplicada na parede gengival, até o ângulo cavo-superfícial - CS; resina de baixa viscosidade aplicada na parede gengival, até a junção amelo-dentinária - JAD) (n=10). Um grupo controle foi realizado sem o uso de resina de baixa viscosidade. Após os procedimentos restauradores (resina microhíbrida Filtek Z250) e termociclagem, os dentes foram imersos em azul de metileno por 2 horas. As amostras foram trituradas e o pó foi preparado para a análise de absorbância em espectrofotometria. Os resultados foram lidos e interpretados através da análise estatística ANOVA (p=0,05) em esquema fatorial 2 x 3 x 2 com 1 tratamento adicional e teste de Tukey (p=0,05). A comparação com o grupo controle foi realizada pelo teste de Dunnett (p ?0,05). Os resultados mostraram que não houve diferença estatística entre os compósitos de baixa viscosidade testados. Para SUR, não houve diferença estatística entre as técnicas restauradoras. Para Z350F, a técnica JAD apresentou menor infiltração marginal quando utilizou-se camada de 1,0 ou 2,0 mm de espessura. E para ambas as técnicas e compósitos de baixa viscosidade, 0,5 mm de espessura apresentou menor infiltração que 2,0 mm. Comparando com o grupo controle, Z350F (0,5 mm para técnica CS e JAD, e 1,0 mm para técnica JAD) e SUR (0,5 mm para a técnica JAD) apresentaram menor infiltração marginal. É possível concluir que o uso de menor espessura de resina de baixa viscosidade proporcionou menor infiltração marginal, sugerindo melhor selamento da interface dente restauração
Abstract: The aim of this in vitro study was to evaluate the microleakage in Class II cavities, restored with dental composite, varying the thickness of two flowable composite resins and the restorative technique. One hundred and thirty cavities were prepared on proximal surfaces of bovine teeth, and were randomly divided according to the flowable composite resin (Filtek Z350 Flow - Z350F and SureFil®SDRTM Flow - SUR), thickness of flowable composite (0.5, 1.0, or 2.0 mm) and restorative technique (flowable composite applied until cavosurface angle - CS; or flowable composite applied until amelo-dentinal junction - ADJ) (n=10). A control group was performed without using flowable composite. Following restorative procedures (microhibrid composite Filtek Z250) and the thermocycling, the samples were immersed in methylene blue for 2 hours. The samples were ground and the powder was prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed by three-way ANOVA and Tukey test, and Dunnett test were applied to comparisons with control group (p?0.05). Results showed that there was no statistical difference between the flowable composite tested. For SUR, there is no statistical difference between the restorative techniques. For Z350F, the restorative technique ADJ showed lower microleakage than technique CS only when the flowable composite was applied to 1.0 and 2.0 mm thickness. And for both techniques and flowable composite resins, 0.5 mm sample thicknesses showed lower microleakage than 2.0 mm thickness. Comparing with the control group, the lower thickness of Z350F (0.5 mm for technique CS and 2 and 1.0 mm for JAD) and SUR (0.5 mm for technique ADJ) showed lower microleakage. It is possible to conclude that a lower thickness of flowable composite resin provided lower microleakage, suggesting better sealing tooth-restoration interface
Mestrado
Dentística
Mestre em Clínica Odontológica
Girotto, Aline Carvalho. "Avaliação da adaptação interna, resistência de união e resistência à fratura da associação entre resinas bulk-fill e adesivos simplificados em dentes tratados endodonticamente /." Araraquara, 2019. http://hdl.handle.net/11449/181831.
Повний текст джерелаResumo: O objetivo do presente estudo foi avaliar a adaptação interna (AI), resistência de união (RU) e resistência à fratura (RF) da associação entre resinas bulk-fill de alta viscosidade e adesivos simplificados, quando utilizados para restaurar dentes que foram endodonticamente tratados. Foram avaliados 4 sistemas restauradores comerciais, sendo eles Grupo Controle (GC): Scotchbond Multi-Purpose + Filtek Z350XT (3M/ESPE); (SBU/FBF) Single Bond Universal + Filtek Bulk-fill (3M/ESPE); (OBA/SF) OptBond All-in-one + Sonic Fill (Kerr) e (TBU/TBF)Tetric-N- Bond Universal + Tetric-N-Ceram Bulk-Fill (Ivoclar/Vivadent). Em 32 pré-molares humanos, a superfície oclusal foi planificada, cavidades classe I padronizadas foram confeccionadas e os dentes foram tratados endodonticamente .A irrigação foi feita com hipoclorito de sódio (NaOCl) 2,5% e EDTA 17%. Após a obturação (AH Plus, Dentsply, De Trey, Konstanz, Germany) e a limpeza da câmara pulpar com álcool 99%, foi aplicada uma fina camada de cimento de ionômero de vidro modificado por resina Ionoseal (VOCO, GmbH, Vuxhaven, Alemanha). Os dentes foram então divididos nos grupos experimentais (n=8), e as restaurações foram realizadas. Após 24 horas, os espécimes receberam um corte centralizado, as metades obtidas foram polidas e réplicas em resina epóxi para a avaliação da AI em microscopia eletrônica de varredura foram confeccionadas. Em 40 terceiros molares humanos, um corte foi feito para exposição da dentina profunda. Após a padronização da... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective of this study was to evaluate internal adaptation (IA), bond strength (BS), and fracture resistance (FR) of the combination of high-viscosity bulk-fill resins and simplified adhesives in the restoration of endodontically-treated teeth. Four commercial restoration systems were evaluated, which were the control group (CG) in which Scotchbond Multi-Purpose + Filtek Z350XT (3M/ESPE) was used, (SBU/FBF) Single Bond Universal + Filtek Bulk-fill (3M/ESPE); (OBA/SF) OptBond All-in-one + Sonic Fill (Kerr), and (TBU/TBF)Tetric-N- Bond Universal + Tetric-N-Ceram Bulk-Fill (Ivoclar/Vivadent). In 32 human pre-molars, the occlusal surface was flattened, standard class I cavities were created, and the teeth were treated endodontically. Irrigation was performed using 2.5% sodium hypochlorite (NaOCl) and 17% EDTA. After the fillings (AH Plus, Dentsply, De Trey, Konstanz, Germany) and cleaning of the pulp chamber with 99% ethanol, a thin layer of ionoseal resin-modified glass iomer luting cement was applied (Voco, GmbH, Vuxhaven, Germany). The teeth were then divided into the experimental groups (n=8) and the restorations were performed. After 24 hours, the specimens were sectioned in the middle and the halves obtained were polished, and replicas were made in epoxy resin to evaluate IA using scanning electron microscopy. In 40 human molar thirds, a cut was made to expose the deep dentin. After standardization of the smear layer (file # 600), the tissue was treated with 2.5% NaOCl... (Complete abstract click electronic access below)
Doutor
Sonbul, Helal. "On caries risk profile and prevention in an adult Saudi population /." Göteborg : Department of Cariology, Institute of Odontology at Sahlgrenska Academy, University of Gothenburg, 2010. http://hdl.handle.net/2077/21947.
Повний текст джерелаTrevisan, Tamara Carolina [UNESP]. "Avaliação da resistência de união de reparos em resinas compostas convencionais e bulkfill." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/138571.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Técnicas de reparos de restaurações vêm sendo amplamente utilizadas como um tratamento alternativo e conservador á substituição de restaurações defeituosas. O conhecimento do material a ser reparado e de um protocolo ideal, permitiria uma melhor relação biomecânica entre dente e material restaurador e possibilitaria técnicas eficazes e menos invasivas. O objetivo do presente estudo foi avaliar a resistência de união de reparo de diferentes resinas compostas, sob a influência de tratamentos de superfície, especialmente em relação a uma nova proposta comercial denominada de resinas "bulk fill". Para isso, foram confeccionados corpos de prova com diâmetro de 8mm por 4mm de altura, de diferentes classes de resinas compostas: Z350XT, Z250XT, Grandio, Epricord, Tetric Bulkfill, Xtra Fill e Sonic Fill (n=15). Estes passaram por processo de envelhecimento artificial, realizado por meio de armazenamento em estufa com saliva artificial por 3 meses, sendo realizada a troca da saliva semanalmente, e finalizado com termociclagem 5o e 55ºC por 20 segundos em água para 1000 ciclos. Foram distribuídos aleatoriamente em três subgrupos, de acordo com o tratamento de superfície (n=5): G1- Controle- sem tratamento prévio; G2- Jateamento óxido alumínio; G3- Jateamento óxido de sílica. Após a aplicação dos respectivos tratamentos de superfície, cada espécime foi reparado com resina composta Z100 em incrementos de aproximadamente 2mm e fotopolimerizado em um aparelho de fotopolimerização convencional (Bluephase, Ivoclar Vivadent, Liechtenstein) até obtenção 4 mm de altura. A seguir os espécimes foram submetidos a novo ciclo de envelhecimento artificial por uma semana em estufa com saliva artificial, e termociclagem 5o e 55ºC por 20 segundos em água para 1000 ciclos. As amostras foram seccionadas em seu longo eixo em máquina de corte (Isomet 1000, Buehler Ltd, Lake Bluff, IL, EUA), a fim de se obter espécimes no formato de paralelepípedo, com a linha de união localizada centralmente. Cada espécime foi individualmente fixado em máquina de microtração Micro Tensile Tester- MTT (BISCO, Inc. 1100 W. Irving Park Rd. Schaumburg, IL 60193 USA 1- 800-247-3368), e submetido a teste de microtração com velocidade de 0,5 mm/min e célula de carga de 500N. Realizou-se análise de variância para avaliar a influência dos diferentes materiais e tratamentos de superfície na resistência de união de reparos. O padrão de fratura observado nos reparos foi analisado por meio do teste de qui-quadrado( 2 ), para uma com significância estatística de 5%. A análise de variância mostrou que existe diferença estatisticamente significativa (p=0,001) entre a resistência coesiva dos materiais, e para interação material e tratamento de superfície sobre a resistência de união dos reparos (p=0,001). O teste de quiquadrado( 2 ) também mostrou que existe associação entre o tipo de fratura e as variáveis materiais e tratamentos de superfície (p=0.001). Concluindo que, as diferentes classes de resinas compostas testadas respondem de maneira diferente frente aos tratamentos de superfície aplicados, não sendo possível estabelecer um protocolo clínico ideal para procedimentos de reparo. Além disso, as resinas bulkfill testadas possuem resistência de união aceitável, semelhante às demais classes de resinas compostas, demonstrando que procedimentos de reparo são indicados para esses materiais.
Restoration repair techniques have been widely used as an alternative and conservative treatment for replacement of defective restorations. The knowledge of the material to be repaired and an ideal protocol would allow a better biomechanical relationship between tooth and restorative material and would allow techniques effective and less invasive. The aim of this study was to evaluate the repair's bond strength of different composite resins under the influence of surface treatments, especially in relation to a new commercial proposal called Bulk-fill Resin-based Composites. For this, specimens were prepared with 8 mm diameter by 4 mm in height, of different classes of composite resins: Z350XT, Z250XT, Grandio, Epricord, Tetric Bulkfill, Xtra Fill e Sonic Fill (n=15). These were submitted to artificial aging process by storing in an oven with artificial saliva for 3 months, and their exchange performed weekly and finished 5 o and 55°C thermocycling for 1000 cycles. They were randomly divided into three subgroups, according to the surface treatment (n=5): Control group- without treatment (G1), Aluminum oxide blasting (G2), Silica oxide blasting (G3). After applying the respective surface treatments, each specimen was repaired with composite resin (Z-100, 3M ESPE) in increments of 2mm, approximately, and light cured in a conventional light-curing unit (Bluephase, Ivoclar Vivadent, Liechtenstein) to obtain 4 mm height. Then specimens were subjected to a new cycle of artificial aging for one week incubated in artificial saliva and thermal cycling 5 and 55°C for 1000 cycles. The samples were sectioned in their long axis in a cutting machine (Isomet 1000, Buehler Ltd, Lake Bluff, IL, USA) in order to obtain the specimens in parallelepiped shape with union line centrally located. Each specimen was individually set at a micro-tensile machine Micro Tensile Tester - MTT (BISCO, Inc. 1100 W. Irving Park Rd. Schaumburg, IL 60193 USA 1-800-247-3368), and submitted to micro-tensile test at 0.5 mm/min speed with a 500 N load cell. It was performed variance analysis for there is influence of different materials and surface treatments on the bond strength of repair. The fracture pattern observed in repairs was analyzed using the chi-square test ( 2 ) with 5% statistical significance level. Analysis of Variance showed that there was a statistically significant difference (p=0.001) between the tensile strength of materials, and for interaction materials and surface treatment on bond strength of repair (p=0.001). There was association between the type of fracture and the variables material and surface treatments (p=0.001). It can be concluded that the different classes of composites tested respond differently compared to the applied surface treatment and it is not possible to establish a clinical protocol for repair procedures. Moreover, the tested bulk fill resins have acceptable bond strength, similar to other classes of composites, demonstrating that these materials are suitable for repair procedures.
Sunnegårdh-Grönberg, Karin. "Calcium aluminate cement as dental restorative : mechanical properties and clinical durability /." Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-270.
Повний текст джерелаAlonso, Roberta Caroline Bruschi. "Formação de fendas em restaurações de composito : tecnicas de avaliação, efeito de metodos de fotoavaliação e relação com a resistencia da união." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288115.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A formação de fendas em restaurações de compósito foi caracterizada neste estudo, abrangendo-se técnicas de avaliação, fatores modificadores e a relação com a resistência de união das restaurações à estrutura dental. No capítulo 1, objetivou-se validar a técnica do corante para avaliação das fendas através da comparação com a observação em Microscopia Eletrõnica de Varredura (MEV). Vinte incisivos bovinos foram selecionados e desgastados até expor uma área plana em dentina, onde duas cavidades foram preparadas e restauradas com o compósito Filtek 2250 ou Filtek Flow. As amostras foram polidas e réplicas foram obtidas em resina epóxica. As réplicas foram observadas em MEV para determinar a porcentagem de fenda ao longo da margem cavitária. Na técnica do corante, Caries Detector (Kuraray) foi aplicado sobre as restaurações durante 5s. A imagem digital das restaurações coradas foi analisada com o software Image Tool para determinar a porcentagem de fendas. Os dados foram submetidos a ANOVA e teste de correlação de Pearson. Filtek Flow apresentou 35,54% e 33,52%, e Filtek 2250 26,68% e 29,11% de fendas, quando avaliadas em MEV e pela técnica do corante, respectivamente. Não houve diferença significativa entre os compósitos independente do método de avaliação, havendo forte correlação positiva (r=0,83) entre eles. Concluiu-se que a técnica do corante pode ser utilizada para avaliação das fendas com confiabilidade dos resultados. No capítulo 2, o efeito de métodos de fotoativação modulados na' adaptação marginal e intema de restaurações confeccionadas com diferentes compósitos foi determinado. Sessenta terceiros molares foram selecionados, seccionados (2 fragmentos) e tiveram a superfície vestibular ou palatina ou lingual desgastada para expor uma área plana em esmalte, onde uma cavidade foi confeccionada. Os dentes foram distribuídos em 12 grupos (n=lO), segundo o compósito restaurador (Filtek 2250, Herculite XRV e Heliomolar) e o método de foto ativação (Luz continua; Soft-Start; Pulse delay; Luz intermitente). O teste de adaptação marginal (técnica do corante) foi conduzido da mesma maneira descrita anterionnente. Após, os espécimes foram seccionados dividindo a restauração em 4 fatias, que foram coradas e o mesmo procedimento de avaliação da adaptação marginal foi realizado para determinar a adaptação intema. Assim, põde-se observar que todas as restaurações apresentaram perfeito selamento das margens extemas. Considerando as fendas intemas, os métodos modulados geraram redução significativa nas fendas quando comparados à luz contínua, independe do compósito empregado. Filtek 2250 apresentou a melhor adaptação interna, independente do método de fotoativação. A interação tipo de compósito e método de fotoativação não foi significativa. Conclui-se que os métodos de fotoativação modulados são eficientes na redução da formação de fendas internas e que podem ser indicados para a prática clínica, independente do compósito empregado. No capítulo 3, o objetivo foi relacionar a resistência da união à adaptação marginal e interna de restaurações fotoativadas por diferentes métodos. A resistência da união foi mensurada em cavidades tronco-conicas confeccionadas em dentes bovinos através do teste push-out (Instron). A adaptação marginal e interna das restaurações foi verificada da mesma maneira descrita anteriormente. Em ambos os testes, as cavidades foram restauradas com o compósito Esthet-X, sendo as amostras distribuídas em 5 grupos (n=10), de acordo com o método de fotoativação: G 1 - Luz contínua; G2 - Luz contínua baixa intensipade; G3 - Soft-start; G4 - Luz Intermitente; G5 - Pulse Delay. A dose de energia foi padronizada em 14J. Os dados foram submetidos a ANOVA e teste de Tukey. Considerando resistência da únião, G5 (7,2 MPa) apresentou resultados significativamente melhores que G 1 (4,6 MPa). G2, G3 e G4 tiveram médias intermediárias, não havendo diferenças significativas entre esses grupos e entre eles e G 1 ou G5. Considerando adaptação marginal, não houve diferença significativa entre os grupos. Na adaptação interna (que incluía o substrato dentinário), o resultado foi inverso ao do teste de resistência de união, ou seja, G5 (2,8%) teve menor média de fendas que G 1 (10,1%). Concluiu-se que a modulação da energia luminosa pode acarretar em aumento da resistência da união e redução na formação de fendas internas, havendo relação inversa entre resistência da união e formação de fendas internas
Abstract: Gap formation in composite restorations has been characterized in this dissertation by way of evaluation techniques, modifying factors and the relationship between bond strength of the restorations and the dental structure. In Chapter 1 the objective was to compare the dye staining technique to Scanning Electron Microscopy (SEM) evaluation of gap formation in order to validate the dye technique. Twenty bovine incisors were selected and ground so as to expose a flat dentin area in which two circular cavities were prepared and restored using Filtek 2250 or Filtek Flow. The specimens were polished and replicas were obtained in epoxy resin. Replicas were observed in SEM to determine the percentage of gap fonnation in the margins of the restorations. In dye staining technique, the Caries Detector was applied on each restoration for 5 seconds. Digital images of the stained restorations were analyzed using Image Tool to determine gap percentage. Data were submitted to ANOVA and Pearson's correlation. Filtek Flow showed 35.54% and 33.52% of gap and Filtek 2250 showed 26.68% and 29.11%, when evaluated using SEM and Dye staining technique, respectively. There was no difference between the composites, regardless of the evaluation technique. There was a strong positive correlation (r=0.83) between the results obtained through the tested methods to assess marginal gap. This led to the conclusion that dye staining technique can be reliably employed to evaluate the gap fonnation in composite restorations. Chapter 2 aims at determining the effect of modulated photoactivation methods on gap fonnation of restorations using different composites. Sixty third molars were selected, sectioned (2 fragments) and ground so as to expose a flat enamel area in which a cavity was prepared. The specimens were distributed into twelve groups (n=10), according to the restorative composite (Filtek 2250, Herculite XRV, and Heliomolar) and the photoactivation method (Continuous Light, Soft-Start, Pulse Delay, and Intermittent Light) applied. Marginal adaptation test was conducted in the same way described before (dye staining technique). The specimens were then sectioned in 4 slices, all of which were stained, and the same evaluation procedure used to determine marginal adaptation was employed to evaluate internal gap fonnation. All restorations showed perfect sealing of the enamel outer margins. With regards to internal adaptation, modulated photoactivation methods showed a significant reduction on gap fonnation when compared under continuous light, regardless of the composite. Filtek 2250 showed the best internal adaptation, regardless of the photoactivation method. The interaction between restorative composite and photoactivation method was not significant. The conclusion was that modulated photoactivation methods decrease the internal gap formation of composite restorations and should thus be encouraged on clínical practice, regardless of the type of composite. In Chapter 3, the aim was to evaluate the relationship between bond strength and marginal and internal adaptation of composite restorations photocured by different methods. Bond strength was measured in conical cavities prepared in bovine incisors using push-out test (Instron). Marginal and internal adaptation testswere conducted in the same way as before (dye staining technique). For both tests, cavities were filled with Esthet X resin composite. The specimens were distributed into 5 groups (n= 1 O) according to photoactivation method: G 1 - continuous light; G2 low intensity continuous light; G3 - soft start; G4 - intermittent light; G5 - pulse delay. 14J was the standard energy dose. Data were submitted to ANOVA and Tukey's test. Regarding bond strength, G5 (7.2 MPa) was statistically superior to Gl (4.6 MPa). G2, G3 and G4 showed intermediate mean values, which were not different from each other or from G 1 or G5. Regarding marginal adaptation, there was no statistical difference among the groups. Internal adaptation results (that included dentin substrate) were the opposite of bond strength results. G5 (2.8%) showed a reduction on gap formation when compared to Gl (10.1%). In conclusion, it may be said that the modulated photocuring methods can increase bond strength while decreasing internal gap formation. An opposite relationship was observed regarding push-out bond strength and internal adaptation of composite restorations
Doutorado
Materiais Dentarios
Doutor em Materiais Dentários
Celiberti, Paula. "Novas possibilidades de manejo e monitoramento de lesões de cárie em superfícies proximais." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23132/tde-11092012-120532/.
Повний текст джерелаAim: This thesis is composed of six studies, which aimed at evaluating (1) the efficacy of prophylaxis methods used, professionally and at home, on approximal surfaces, in contact with the adjacent tooth, (2) and after simulation of tooth separation; (3) the intrinsic fluorescence of sealing materials and their ability of these materials to clock the fluorescence of the underlying surface; (4) the performance of a laser fluorescence (LF) device in detecting and quantifying approximal caries in primary molars under the sealant; (5) access the microleakage and penetration ability of sealing materials on cavitated approximal lesions; and (6) access, in vivo, the success rate of approximal sealant when compared to the conventional restorative procedure. Materials and Methods: For the aims (1) and (2), eight pairs of primary molars were used to evaluate the efficacy of prophylaxis methods on approximal surfaces. For that, two dispositives were idealized, one allowed the teeth to be in approximal contact and the other aimed to mimic the temporary tooth separation, which a 0,5mm space between the approximal surfaces. A marker, in form of spray, was applied on the approximal surfaces and the different methods were applied. All methods were tested on the same teeth, after complete removal of the marker and its re-application. Afterwards, the surfaces were photographed by an optic microscope and analyzed. For the aim (3), standardized cavities of 0,5 and 1 mm in depth, bored in clear acrylic boards and filled with different resinous materials, were used to evaluate their intrinsic fluorescence and their ability to block the fluorescence of the underlying surface. The cavities were accessed by the LF device (DIAGNOdent pen - DDpen) when empty, and right after filling. The subsequent measurements were done at 24 hrs, one week and one month after filling. For the aim (4), thirty primary molars with non-cavitated approximal caries lesions, scored ICDAS 1 and 2, were chosen for the evaluation of the influence of a fissure sealant and a dental adhesive on the detection of these lesions. For that, the teeth were mounted in a dispositive, which allows a close approximal contact, and the surfaces with caries were measured with the DDpen after cleaning (baseline) and right after sealing. The 14 measurements were repeated after 24 hrs, one week and one month. The teeth were, afterwards, sectioned and their histopathology analyzed. For the aim (5), forty-five primary molars and forty permanent molars with cavitated approximal caries lesions, scored ICDAS 3, 4 or 5, were sealed with or without an adhesive intermediate layer. After sealing, the teeth were thermocycled (1000 cycles) and inserted in methylene blue 2% for 24 hrs. Afterwards, the teeth were sectioned and microleakage and penetration ability were accessed. For the aim (6), an in vivo pilot study, which assessed the success rate of approximal sealant on cavitated lesions compared to the conventional restorative treatment. Eight children, aged 5-9 years, with 22 cavitated approximal lesions, were included in this study. Lesions treatment was raffled by the children, and therefore, 13 lesions were sealed and 9 were restored. All lesions were controlled radiograph and clinically up to 18 months. Results: (1) In primary molars in approximal contact, the dental floss was the most efficient method on cleaning the area of interest, removing 83,1% of the marker. On the buccal and lingual interdental spaces, the toothbrush presented the best results, removing approximately 100% of the marker. (2) On primary molars simulating tooth temporary separation, the median and large interdental brushes were able to remove more marker from the area of interest. The flat bristle brush was the most effective method, removing 84-100% of the marker from the buccal and lingual interdental spaces, and extending its efficacy to the area under the contact point, removing 48,2% of the marker. All methods failed at removing the marker from the cavity. Even with the tooth separation, the interdental brushes removed the marker to a maximum of 20%. (3) On the acrylic boards, the two-bottle dental adhesive was more stable, exhibiting less intrinsic fluorescence alterations on the reading up to one month after sealing, and influencing the least the measurement of the underlying surfaces fluorescence. Among the fissure sealants, the clear and highly filled material presented the most acceptable results. (4) On non-cavitated approximal lesions in primary molars sealed with the two-bottle dental adhesive, the LF reading showed a good correlation to lesion depth, histologically accessed. (5) On the sealing of cavitated approximal lesions in permanent and primary molars, the use of an adhesive intermediate layer and the filler content of the sealant did not influence the microleakage and penetration ability into the cavities. Lesions ICDAS 5 were less filled than lesions ICDAS 3 or 4. (6) On the in vivo study, after 18 months, 69,2% of the approximal sealants have failed, against to 11,1% of the restorations. This difference was shown to be statistically significant. Regarding progression, 53,8% of sealed 15 lesions have progressed, against 11,1% of the restored ones. Conclusions: In cavitated approximal caries lesions, the prophylaxis methods failed to remove the marker from the cavity. In non-cavitated lesions, the daily tooth brushing, by Fones method, associated with flossing, was shown to be the most efficacious method of removing effectively the biofilm from the approximal surfaces. The most efficacious methods indicated to the pre-sealing prophylaxis on approximal surfaces with or without cavitation are the flat bristle brush associated with an interdental brush larger than the space obtained after tooth separation, in diameter. On the approximal sealant of non-cavitated lesions, the two-bottle dental adhesive allowed a better correlation between LF readings and lesion depth, for exhibiting less intrinsic fluorescence alterations with aging and for exerting less influence on LF measurements from the underlying surface, and therefore, can be indicated for approximal sealant on non-cavitated lesions to be controlled by the LF method. However, when a filled material is needed, sealants with opacifiers should be avoided. When sealing cavitated lesions, the use of an adhesive intermediate layer and a highly filled sealant did not contribute to a decrease in microleakage and in an increase of penetration ability into the cavities. The in vivo study suggests that the sealant is not a viable alternative for the treatment of cavitated approximal lesions, for exhibiting higher failure rates.
Azzam, Mai Ahmed. "Flexural strength comparison of monolayer resin composite to bilayer resin/ liner composite." Thesis, Connect to resource online, 2009. http://hdl.handle.net/1805/2077.
Повний текст джерелаTitle from PDF t. p. (viewed Feb. 5, 2010) Advisor(s): Jeffrey A. Platt, Chair of the Research Committee, Joseph Legan, Carl J. Andres, David Brown, Burak Taskonak . Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 45-52).
De, Waal Andre Stephanus. "Comparison of an intra-oral approach using a contra-angle hand piece with the transbuccal technique for mandibular angle fracture repair." Thesis, University of the Western Cape, 2010. http://hdl.handle.net/11394/2540.
Повний текст джерелаPurpose: To compare the intra-oral approach using a contra-angled hand piece with the standard transbuccal approach in the treatment of mandibular angle fractures. Patients and Methods: Thirty patients with isolated fractures of the mandibular angle were treated by open reduction and internal fixation using one three-dimensional “strut” or “geometric” Synthes® angle plate. Patients were selected randomly for placement of two-millimeter self-threading screws, either through the standard transbuccal technique or with an intra-oral approach using a contra-angle hand piece. None of the patients were placed into post-surgical maxillomandibular fixation (MMF). Swelling and pain were measured pre-operatively and again twenty-four hours after surgery. The actual cutting time from first incision to placement of last suture was documented, as well as the perception of difficulty of the specific case by a single operating surgeon. Results: No statistically significant difference in perception of pain was experienced between the two groups of patients during the first twenty-four hours after surgery. There was also no statistically relevant difference in cutting time between the two placement techniques. A small statistically relevant difference (p-value = 0.089) was found in the amount of swelling post-operatively between the two groups, with more swelling in the control group. Conclusion: The use of a contra-angle hand piece to place screws in the compression band area in a mandible angle fracture is an acceptable alternative to the transbuccal approach.
South Africa
Persson, Anitha. "In vivo evaluations of the neutralizing effect of a hydroxyl ion-releasing resin composite and a prophylactic gel on plaque acidogenicity : measured by the microtouch method." Doctoral thesis, Uneå : Univ, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-945.
Повний текст джерелаIvana, Kantardžić. "Uticaj restaurativnih procedura na biomehaničke karakteristike premolara – analiza realnog trodimenzionalnog modela zuba primenom metode konačnih elemenata." Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2014. https://www.cris.uns.ac.rs/record.jsf?recordId=87352&source=NDLTD&language=en.
Повний текст джерелаLoss of tooth structure from caries, trauma or extensive preparation decreases fracture resistance of tooth. The main goal of restorative procedure is to rebuild lost structures and to protect remaining tooth structures from unfavorable responses from masticatory forces. Aim of thesis was to investigate the influence of different restorative procedures on biomechanical properties of premolar with extensive cavities. Materials and Methods: Three dimensional model of intact maxillary second premolar, based on computerized tomography scan images of extracted tooth, was designed using SolidWorks software. Using this model, 48 models were designed and divided in two groups: models of vital premolars with MOD cavities (group I), and models of premolars with root canal treatment with MOD cavities (group II). In each group use of four restorative materials (direct composite resin restoration, direct composite resin restoration with resin modified glass-ionomer cement as base, indirect composite resin restoration, ceramic restoration), three cavity preparation designs (without cusp coverage, 2mm palatal cusp coverage, 2mm palatal and buccal cusp coverage) and two isthmus width (1/2 and 2/3 intercuspal width) were simulated. After applying static load of 200N, von Mises stresses in enamel, dentin and restoration were calculated using finite element analysis. Results: Cavity preparation design showed the most significant influence on von Mises stress values in tooth structures. Cusp coverage in general decreased stress values in enamel, while palatal and buccal cusp coverage decreased stress values in dentin only in group I. Restorative material affected stress values in enamel, were ceramic restoration contributed to minimal stress values. In dentin, indirect composite resin and ceramic restoration showed no difference in reducing von Mises stress values, but only for models in group I. Cavity isthmus width had influence on stress values in tooth structures only in group I. 1/2 isthmus width decreased stress values in enamel, while 2/3 isthmus width showed same effect in dentin. Conclusion: In order to provide optimal biomechanical characteristics of tooth structures, premolars with MOD cavity should be restored with ceramic overlay covering both palatal and buccal cusp.
Oliveira, Carlos Rangel de Moura. "Resistência à fratura de diferentes núcleos de preenchimento com compósitos bulk fill em dentes com extensa destruição coronária /." Araraquara, 2019. http://hdl.handle.net/11449/183249.
Повний текст джерелаResumo: Este estudo objetivou avaliar a resistência máxima e o padrão de fratura de diferentestécnicas para núcleo preenchimento associados a pinos de fibra de vidro em incisivoslaterais inferiores bovinos com extensa destruição coronária. Quarenta dentes forampreparados endodonticamente, divididos aleatoriamente em 4 grupos experimentais(n=10) e um pino de fibra de vidro (Whitepost DC0,5) foi cimentado com LuxaCore Zpara todos os grupos. A confecção dos núcleos de preenchimento foi realizada, apósobtenção de férula cervical de 1,0 mm, com: FOBF-Filtek One Bulk Fill; FZ350- FiltekZ350 XT; FBFF-Filtek Bulk Fill Flow; e LCZ-LuxaCore Z. Coroas totais de zircônia (YTZP) produzidas em CAD/CAM foram cimentadas com RelyX U200. Apósarmazenamento em água destilada a 37°C por 48 h, os corpos-de-prova foramsubmetidos a ciclos térmicos (10.000 ciclos, 5-55ºC, banhos de 30s) e, posteriormente,ao ensaio mecânico de resistência à fratura por força compressiva aplicada (1,0mm/min) em 135º ao longo eixo do dente em máquina eletromecânica (EMIC DL2000).A força máxima suportada por cada espécime foi registrada em Newton. O modo defratura foi classificado por meio de análise em lupa estereomicroscópica (30X). Osdados de resistência à fratura foram analisados pelo teste não paramétrico de KruskalWallis, seguido pelo post-hoc teste de Dunn. Os dados dos padrões de fratura foramanalisados pelo teste exato de Fisher (α=0,05). Não foram observadas diferençassignificativas (p>0... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This study aimed to evaluate the ultimate fracture strength and failure modes of different core techniques associated with intraradicular fiberpost in bovine mandibular lateral incisors with extensive coronary destruction. Forty teeth were prepared endodontically, randomly divided into 4 experimental groups (n=10) and a fiberpost (Whitepost DC0.5) was cemented with LuxaCore Z for all groups. The core was confeccioned, after obtaining a 1.0 mm cervical ferrule, with: FOBF-Filtek One Bulk Fill; FZ350- Filtek Z350 XT; FBFF-Filtek Bulk Fill Flow; and LCZ-LuxaCore Z. Total zirconia crowns (Y-TZP) produced by CAD/CAM were cemented with RelyX U200. After storage in distilled water at 37ºC for 48 h, the specimens were submitted to thermal cycling (10,000 cycles, 5- 55ºC, 30 s dwell time) and, afterwards, to the mechanical test of compressive strength fracture (1.0 mm / min) at 135º along the tooth axis in electromechanical machine (EMIC DL2000). The ultimate load supported by each specimen was recorded in Newton. The fracture mode was classified by means of stereomicroscopic loupe analysis (30X). The fracture strength data were analyzed by the non-parametric Kruskal-Wallis test, followed by the post-hoc Dunn test. The data of the fracture modes were analyzed by Fisher's exact test (α=0.05). No significant differences (p>0.05) were observed among the FOBF, FZ350 and FBFF groups (mean ranks= 20.30, 12.20 and 23.20, respectively). LCZ (mean rank= 26.30) produced similar results to those... (Complete abstract click electronic access below)
Mestre
Carvalho, Paulo Roberto Marão de Andrade [UNESP]. "Desempenho clínico de diferentes estratégias de adesão de restaurações de lesões cervicais não cariosas." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/148789.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Introdução: O objetivo deste estudo clínico controlado, prospectivo, randomizado e com avaliadores cegos foi avaliar o desempenho clínico de restaurações cervicais não cariosas frente às diferentes estratégias de adesão ao substrato dental. Métodos: foram utilizados um sistema restaurador adesivo (Single Bond Universal/Z350XT) com e sem condicionamento seletivo do esmalte e um cimento de ionômero de vidro modificado por resina (Vitremer) com e sem tratamento prévio com EDTA, seguindo as instruções do CONSORT. Um total de 200 restaurações foram realizadas por dois operadores em 50 pacientes voluntários. Previamente à execução das restaurações e em cada tempo de avaliação foram avaliados os índices de sangramento gengival, placa visível e CPOD. Todas as restaurações foram avaliadas por meio do sistema de avaliação do USPHS modificado. Dois examinadores calibrados, cegos e diferentes dos operadores realizaram as avaliações nos seguintes intervalos de tempo: inicial imediato (baseline), 6, 12 e 24 meses. Ao final de 24 meses os dados foram analisados pelos testes estatísticos de Friedman, Qui-quadrado, Kappa, Cochran, Wilcoxon e análise de regressão logística múltipla, adotando-se nível de significância a 5%. Resultados: a amostra foi composta de 34 homens e 16 mulheres com idade média de 61,8 anos. Em relação ao CPOD, houve um aumento gradativo e significante ao longo do tempo, havendo diferença entre os quatro tempos de avaliação (p≤0,001). Não teve diferença entre os tempos para o índice de placa visível (p=0,28). No entanto, houve uma redução significativa do índice de sangramento gengival entre o baseline e os demais tempos (p≤0,001). Não houve diferença estatisticamente significante entre os 4 grupos em cada tempo de avaliação em nenhum dos critérios avaliados (p>0,05), assim como não houve entre os 4 tempos de avaliação para todos os grupos (p>0,05). Em relação à regressão logística, embora não tenha apresentado nenhuma variável isolada como estatisticamente significante, o modelo como um todo apresentou-se estatisticamente significante (p=0,034). Conclusão: As quatro diferentes estratégias de adesão em restaurações cervicais não cariosas apresentaram similar desempenho clínico após 24 meses de acompanhamento.
Introduction: the aim of this study, prospective, randomized controlled clinical trial and with blind evaluators was to evaluate the clinical performance of non-carious cervical restorations to different strategies of adhesion for the dental substrate. Methods: we used a restorative adhesive system (Universal/Z350XT Single Bond) with and without selective etching of enamel and a modified glass ionomer luting cement for resin (Vitremer) with and without previous treatment with EDTA, following the instructions of the CONSORT. 200 in total restorations were performed by two operators in 50 patients. Prior to the execution of the restorations and each time, we evaluated the evaluation indexes of gum bleeding, visibly Board and CPOD. All restorations were evaluated using the evaluation system USPHS modified. Two calibrated examiners, blind and different operators, performed the evaluations in the following time intervals: immediate initial (baseline), 6, 12 e 24 months. At the end of 24 months data were analyzed by statistical tests Friedman, Qui-quadrado, Kappa, Cochran, Wilcoxon and multiple logistic regression analysis, adopting the significance level 5%. Results: the sample was composed of 34 men and 16 women with an average age of 61.8 years. Concerning the CPOD, there was a gradual and significant increase over time, difference between the four evaluation times (p≤0,001). There was no difference between the time the visible card index (p=0,28). However, there was a significant reduction of gingival bleeding index between the baseline and other times (p≤0,001). There was no statistically significant difference among the 4 groups in each time any of the assessment criteria evaluated (p>0,05), just as happened with the 4 times of evaluation for all groups (p>0,05). With regards to the logistic regression, although it has not presented any isolated variable as statistically significant, the model as a whole showed statistically significant (p=0,034). Conclusion: The four different adhesive strategies in non-carious cervical restorations showed similar clinical performance after 24 months of follow-up.
FAPESP: 2014/07086-0
Tatjana, Maravić. "Uticaj endodontske instrumentacije i restaurativnih procedura na biomehaničke karakteristike endodontski lečenih premolara." Phd thesis, Univerzitet u Novom Sadu, Medicinski fakultet u Novom Sadu, 2019. https://www.cris.uns.ac.rs/record.jsf?recordId=108805&source=NDLTD&language=en.
Повний текст джерелаBackground. Restoration of an endodontically treated premolar with a wide and deep mesial-occlusal-distal (MOD) cavity is often complex due to biomechanical weakening of the tooth. There are no definitive recommendations on the optimal restoration in these cases. The aim of this study was to determine the effects of different endodontic and restorative procedures on von Mises stress values and distribution in dental tissues and restorative materials using finite element analysis (FEA). Methods. Based on CT scans of an second upper premolar, extracted for orthodontic reasons, 135 3D endodontically treated tooth models were created. Each model was subjected to a summary force of 150 N on the occlusal surface simulating the normal biting pattern and maximal von Mises stresses were calculated. Results. MODP cavity design seems to reduce von Mises stress values in dental tissues and P seems to transfer some of the stresses from dental tissues to the composite filling in the MOD cavity when direct restorations are used. Indirect restorations caused lower stresses within dentin. Apical terminus of 0.5 mm induces lower, while the terminus of 1.5 mm induces the highest stresses in dentin in models restored with direct composite and post. It seems that from the aspect of the tooth tissue, it is more recommended to use smaller endodontic instruments sizes. Conclusions. Stiffer restorative materials cause lower stresses in dentin of an endodontically treated structurally weakened tooth, and if a direct restoration is to be used, palatal cuspal reduction could be beneficial for the longevity of the tooth and the restoration. Further, in a wide and deep MOD cavity, without cuspal reduction, the use of a FRC post is recommended in order to reduce the stresses in the enamel and dentin. Moreover, it seems that it is beneficial for the stresses in the tooth tissue to place the apical terminus closer to the root apex as well as to use smaller size endodontic instruments.
Salas, César Felipe Chuquillanqui. "Avaliação da perda mineral decorrente do processo cariogênico e erosivo ao redor de restaurações de cimento de ionômero de vidro." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/23/23132/tde-18112010-104953/.
Повний текст джерелаThe glass ionomer cements (GIC) has more than 40 years been used in clinical practice, with good qualities and properties as dental material of liner and restoration. Since the main reason of restoration replace is secondary caries lesion, the ability of the GIC in inducing remineralization and inhibiting demineralization are important characteristics of this type of material. Furthermore, it is still unclear if the fluoride released by the GIC is able to inhibit the erosive process. Therefore, the aim of this study was to evaluate the ability of inhibition of cariogenic challenge in teeth restored with different types of GIC, as well as to evaluate the inhibition of the same materials concerning erosive challenge. One hundred and twenty samples of bovine teeth were prepared and randomly divided in 6 groups, in order to be submitted to restorative procedures with different types of GIC: High viscous GIC (Fuji IX), resin-modified GIC (Vitremer), resin-modified GIC with nanoparticles (N100), encapsulated resinmodified GIC (Riva Light Cure),encapsulated high viscous GIC (Riva Self Cure) and a control group with resin (Filtek Z350). Knoop microhardness evaluations were initially performed. After performing restorations with standardized dimensions and according to the manufacturers instructions, the samples were submitted to cariogenic challenge (pH cycling) and erosive challenge (citric acid). After 24 h of erosive challenge, and 5 days of pH cycling, new microhardness assessments were performed to evaluate mineral loss around of restorations. For statistical analysis, it was used Anderson-Darling test to test the normality and Levene test to check the homogeneity of the data. To compare the different groups, it was used Analysis of variance and Student-Newman-Keuls post-hoc test, considering the level of significance of 5 %. Erosive challenge significantly reduced enamel surface hardness, but no significant difference was observed irrespectively restorative materials (p>0.05). For enamel analyses, significant differences were observed with respect to the different materials (p<0.001) and distances (p=0.023).Specimens restored with the composite resin presented higher mineral loss and specimens restored with the conventional high viscous GIC and the encapsulated resin-modified GIC presented the lowest values for mineral loss. In conclusion, the GICs exert protective effect only for cariogenic challenge.
Vieira, Rodrigo Monteiro. "Avaliação clínica retrospectiva de restaurações estéticas : classe III, IV e V." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/125809.
Повний текст джерелаThe aim of this study was to evaluate direct composite restorations Class III, IV, V in anterior teeth and premolars through the USPHS and FDI methods. Eighty-seven patients were selected through a search of the patients’ records present in the School of Dentistry. Restorations performed between 2000 to 2013 which a minimum of six months in mouth were selected. Adult patients of both sexes were included, who received treatment with restorations class III, IV or V with the follow composites: Charisma, Z350 XT, Durafill VS, Esthet-X HD, Fillmagic and Opallis; all restorations with total etch adhesive system; on vital and non-vital teeth. Patients with poor oral hygiene or special needs were not included in the study. Clinical evaluation was performed by USPHS and FDI modified methods, by one calibrated examiner. The survival of the restorations was analyzed using the Kaplan-Meier method and log-rank test to compare the groups, and multivariate Cox regression and hazard ratio were employed to identify factors associated with the failure of the restorations. The significance level was 5%. 272 restorations were evaluated with a time interval in service from 8 months to 13 years (mean 4.8 years). 120 class III restorations were evaluated, among them, 15 had failures (12.5%), with an annual failure rate of 2.74%. For the class IV type, 80 restorations were evaluated, 38 demonstrated failures (47.5%), with an annual failure rate of 12.6%. And for the class V, 72 restorations were analyzed, being observed the presence of failures in 27 of them (37.5%), with annual failure rate of 9.3% .The most common reason for failure was fracture or retention loss, for the three types of classes, occurring in 73 cases. Non-vital teeth showed 50% of failure in an average of 4.8 years, with an annual failure rate of 13.4%; while the vital teeth showed 28.1% of failure, with an annual failure rate of 6.6%. Cox regression revealed an association between brands, class type and tooth vitality with failures of the restorations. It was concluded that composite restorations showed a satisfactory clinical performance over time, with success in 70.6% of cases in a mean time of 4.8 years. Class III showed better clinical performance than class IV and V. Non-vital teeth restorations had 2.37 times the risk of failures than vital teeth. The main reasons for failure for all types of restoration was fracture and / or retention loss. Both methods (USPHS and FDI) demonstrated efficient in the process of clinical evaluation for anterior teeth.
Grullón, Patrícia Grau. "Analise ‘in vitro’ do efeito do agente silano em uma resina laboratorial de segunda geração na resistência adesiva ao do substrato dentinário utilizando dois sistemas de cimentos resinosos, por meio do teste de micro-tração." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2005. http://tede2.uepg.br/jspui/handle/prefix/1773.
Повний текст джерелаThe aim of this investigation was to analyze the bond strength between a Second Generation Laboratorial Resin and dentin structure, verifying the effect of the internal treatment with silano agent, using two resin cement systems. The oclusal surface of twenty third human molars was removed and later polished. Blocks were constructed using the Second Generation Laboratorial Resin GradiaTM directly on the dentin structure. The 4 evaluated groups were: I) chemical resin cement sandblasting/silano; II) chemical resin cement sandblasting; III) dual resin cement sandblastings/silano/ and IV) dual resin cement sandblasting. Bonded sticks (0.9 mm² ± 0.2 mm²) were gotten by means of parallel and perpendicular cuts in the bonding interface. Each stick was fixed by its extremities to the modified device for the micro-tensile test in order to locate the area of adhesion perpendicular to the long axle of the force, in the universal assay machine (EMIC) crosshead speed 1mm/min. The final values of bond strength were express in MPa. The fracture modes were analyzed under 40X magnification. The data were submitted to two-way ANOVA and Tukey´s test (α=0.05). Results: The average values in MPa presented by each group were: I) 19.10±2.88; II) 13.67±3.31, III) 11.95±3.96; IV) 25.14±5.66. The analysis two-way ANOVA showed that the factor Treatment was significant (p=0.05), as well as the interaction of the factors Treatment and Type of cement (p=0.0001). The factor Type of cement was not significant (p=0.25). Conclusion: They were not statistical differences between the bond strength of the two resin cements, the internal treatment was significant, for the dual cement the application of the silano agent lowed the values of bond strength in the chemical cement the application of the silano increased the values of adhesive resistance, being not significant. The fracture modes were predominantly adhesive between the Second Generation Laboratorial Resin of and the resin cement.
O objetivo deste trabalho foi analisar a resistência adesiva entre o substrato dentinário e uma Resina Laboratorial de Segunda Geração, verificando o efeito do tratamento interno da peça com agente silano, utilizando dois sistemas de cimentos resinosos. A superfície oclusal de vinte terceiros molares humanos foi removida, e posteriormente polida. Foram confeccionadas peças em forma de blocos, utilizando a resina Laboratorial de Segunda Geração GradiaTM, diretamente sobre a estrutura dentinária. Os 4 grupos avaliados foram: I) jateamento/silano/cimento resinoso químico; II) jateamento/cimento resinoso químico; III) jateamento/silano/cimento resinoso dual e IV) jateamento/cimento resinoso dual. Os espécimes em forma de “palitos” de 0,9 mm² ± 0,2 mm² foram obtidos mediante cortes paralelos e perpendiculares a interface de união. Os “palitos” foram fixado pelas suas extremidades a um dispositivo de modo a posicionar a área de adesão perpendicular ao longo eixo da força de tração em uma máquina de ensaio universal (EMIC) a uma velocidade de 1mm/min. Os modos de fratura foram analisados com lupa esteroscópica (40X). Os dados obtidos foram submetidos à análise de variância para dois critérios e teste de Tukey (α=0,05). Resultados: Os valores médios em MPa apresentados por cada grupo foram: I) 19,10±2,88; II) 13,67±3,31, III) 11,95±3,96; IV) 25,14±5,66. A análise de variância de dois fatores demonstrou que o fator Tratamento da peça foi estatisticamente significante (p=0,05), assim como a interação dos fatores Tratamento da peça e Tipo de cimento (p=0,001). O fator Tipo de cimento não foi estatisticamente significante (p=0,25). Conclusão: Não houve diferenças estatísticas entre os cimentos resinosos testados, o tratamento interno da peça foi estatisticamente significante, para o cimento dual a aplicação do agente silano diminuiu estatisticamente os valores de resistência adesiva e no cimento químico os valores de resistência adesiva foram aumentados pela aplicação do agente silano não sendo estatisticamente significante. As modos de fratura foram predominantemente adesivas entre a Resina Laboratorial de Segunda Geração e o Cimento Resinoso.
Lindberg, Anders. "Resin composites : Sandwich restorations and curing techniques." Doctoral thesis, Umeå : Umeå University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-510.
Повний текст джерелаPaula, Alexandra Mara. "As restaurações em lesões cervicais não cariosas pela “técnica sanduíche” apresentam taxas de retenção superiores à técnica restauradora com resina composta? uma revisão sistemática e meta-análise." Universidade Estadual de Ponta Grossa, 2018. http://tede2.uepg.br/jspui/handle/prefix/2629.
Повний текст джерелаMade available in DSpace on 2018-09-12T13:54:13Z (GMT). No. of bitstreams: 2 license_rdf: 811 bytes, checksum: e39d27027a6cc9cb039ad269a5db8e34 (MD5) Alexandra Mara de Paula.pdf: 3202848 bytes, checksum: 71c3b52dd4c90886639413fccf850cdb (MD5) Previous issue date: 2018-01-20
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Objetivos: Esta revisão sistemática e meta-análise comparou as taxas de retenção de restaurações em lesões cervicais não cariosas (LCNCs) restauradas com a “técnica sanduíche” (uma base de cimento de ionômero de vidro [CIV] ou cimento de ionômero de vidro modificado por resina [CIVMR] + resina composta [RC]) ou restaurações de RC. Desfechos secundários como descoloração marginal, adaptação marginal, estabilidade de cor e cáries adjacentes às margens das restaurações também foram analisados. Métodos: Este estudo incluiu ensaios clínicos randomizados (ECRs) que compararam as taxas de retenção de LCNCs restauradas com a “técnica sanduíche” com restaurações de RC. A busca foi realizada na Biblioteca Cochrane, PubMed, Scopus e Web of Science, entre outras bases de dados. A literatura cinza foi inspecionada, bem como os resumos da IADR (1990-2017), em andamento e não publicados. A qualidade dos estudos foi avaliada usando a ferramenta de risco de viés Cochrane Collaboration. Os dados dos desfechos primários e secundários foram avaliados por meta-análise em diferentes seguimentos (um, dois e três anos). A qualidade do corpo de evidências foi avaliada usando a abordagem GRADE Resultados: Inicialmente, um total de 3.645 artigos foram selecionados. Após a seleção por títulos, resumos e textos completos, foram encontrados 6 artigos, mas três foram acompanhamentos do mesmo ECR e, portanto, um total de quatro estudos permaneceu para análise. Todos os estudos apresentaram risco de viés indefinido. De todos os desfechos, apenas a perda de retenção foi menor para a “técnica sanduiche” no seguimento de três anos (RR = 7,5; CI95% 2,1 a 27,2; p = 0,002). Conclusões: Maiores taxas de retenção em LCNCs restauradas com a “técnica sanduíche” foram observadas em comparação com restaurações de RC após três anos de avaliação. A descoloração marginal, estabilidade de cor, adaptação marginal e cáries adjacentes às margens das restaurações não foram influenciadas pela técnica restauradora. Com exceção das taxas de retenção, classificadas como moderadas, a qualidade das evidências dos outros desfechos foi classificada como baixa.
Objectives: This systematic review and meta-analysis compared the retention rates of non-carious cervical restorations (NCCLs) restored with the sandwich technique (a lining of glass ionomer cement [GIC] or resin-modified glass ionomer cement [RMGIC] + composite resin [CR]) or CR restorations. Secondary outcomes such as marginal discoloration, marginal adaptation, color match and secondary caries were also analyzed. Methods: This study included randomized clinical trials (RCTs) that compared the retention rates of NCCLs restored with the “sandwich technique” with CR restorations. The search was performed in Cochrane Library, PubMed, Scopus and Web of Science among other databases. Grey literature was inspected as well as the abstracts from the IADR (1990-2017), ongoing and unpublished. The quality of the studies was evaluated using the Cochrane Collaboration bias risk tool. Data of primary and secondary outcomes were meta-analyzed at different follow-ups (one; two and three-year) using the random effects model. The quality of the body of evidence was assessed using the GRADE approach Results: Initially, a total of 3.645 articles were selected. After selection by titles, abstracts and full texts, 6 articles were found, but three were follow-ups of the same RCT and therefore a total of four studies remained for analysis. All studies were at unclear risk of bias. From all outcomes, only loss of retention was lower for the “sandwich technique” at the three-year follow-up (RR = 7.5; 95% CI 2.1 to 27.2; p = 0.002). Conclusions: Higher retention rates in NCCLs restorations were observed with the sandwich technique compared to CR restorations after three years of evaluation. Marginal discoloration, color match, marginal adaptation and secondary caries were not influenced by the restorative technique. Except from retention rates, graded as moderate, the quality of the evidence of the other outcomes was graded as low.
Souza, Fábio Herrmann Coelho de. "Efeito da técnica restauradora, do tipo de preparo e do envelhecimento de restaurações de resina composta sobre a resistência à fratura dental, resistência adesiva e vedamento marginal." Universidade Federal de Pelotas, 2006. http://repositorio.ufpel.edu.br/handle/ri/2307.
Повний текст джерелаThe aim of this study was to evaluate, in vitro, the effect of composite resin restoration techniques, bevel and storage time on the fracture strength, restoration retention and gap formation. For the fracture strength test, standard MOD cavities were prepared in 100 upper premolars, which were divided in two storage times (24 hours and 6 months with 1000 thermocycles), and in each group, sub-groups were randomly formed as follow: group 1 direct composite resin restoration(Filtek Z250 and Adper Single Bond 3M/ESPE) without bevel (butt joint); group 2 beveled direct composite resin restoration; group 3 indirect composite resin inlay (Z250 and Rely X ARC 3M/ESPE) without bevel(butt joint); group 4 beveled indirect composite resin inlay; group 5 sound teeth; group 6 teeth with MOD preparations (no restorations). For the retention test, the incisal edge of 90 lower incisors was sectioned, and divided in the same restorative groups as described above (except group 6). To evaluate gap presence or absence, proximal box cavities were prepared in 24 human third molars, which were restored with direct or indirect composite restorations, with or without bevel, similar to above described and examined under SEM evaluation. Data was statistically analysed by A NOVA, Tukey and t-student tests for fracture strength and retention tests, and Fisher s exact test for gap formation (=0,05). At the 24 hours, beveled restorations exhibited higher fracture strength values than non beveled restorations and most of the tested groups showed resistance similar or superior than sound teeth. After 6 months, the best results were obtained for beveled inlays and the worst values were observed for butt joint direct restorations. In the retention test,beveled restorations had superior performances than non-beveled restorations, in both periods of time. For both tests, a 6-month storage time and thermal cycling produced significant properties decrease in groups 1, 2 and 4 showed. Under SEM examination, no difference was observed among groups after 24 hours. However,after 6 months, beveled restotations remained without gap formation and they had better performance than butt joint restorations. Pearson correlation test showed positive correlation between fracture strength and retention tests. Within the limitations of the study, it was concluded that aging impaired adhesive properties, bevel improved the performance in all tests and generally indirect restorations were not superior to direct restorations.
O objetivo do presente trabalho foi avaliar in vitro o efeito da técnica restauradora, da confecção de bisel e do tempo de armazenamento de restaurações de resina composta sobre a resistência à fratura dental, resistência à fratura de restaurações (resistência adesiva) e formação de fenda marginal. Para o teste de resistência à fratura dental, foram utilizados 100 pré-molares superiores, submetidos a preparos cavitários MOD, divididos em 2 tempos de armazenamento (24 horas e 6 meses com termociclagem 1000 ciclos), subdivididos nos seguintes grupos: grupo 1 restaurados com resina composta direta (Filtek Z250 e Adper Single Bond 3M/ESPE) sem bisel; grupo 2 resina composta direta com bisel; grupo 3 resina composta semi-direta (Z250 e Rely X ARC 3M/ESPE) sem bisel; grupo 4 resina composta semi-direta com bisel; grupo 5 dentes hígidos; e grupo 6 dentes apenas preparados (n=10). Para o teste de resistência à fratura de restaurações, foram utilizados 90 incisivos inferiores, que receberam desgaste do bordo incisal e foram divididos nos mesmos grupos citados acima (exceto o grupo 6). Para a avaliação de presença ou ausência de fenda marginal,foram empregados 24 terceiros molares, que receberam preparos proximais, divididos nos mesmos grupos acima (exceto os grupos 5 e 6). Os dados foram submetidos à análise estatística (=0,05) através dos testes ANOVA, Tukey e t-student para resistência à fratura dental e resistência à fratura de restaurações e teste exato de Fisher para formação de fenda marginal. Os resultados mostraram que, para resistência à fratura dental, no tempo de 24 horas, as restaurações com bisel foram superiores às demais, enquanto as sem bisel não diferiram dos dentes hígidos. Após 6 meses, as restaurações semi-diretas com bisel foram superiores às demais, não diferindo das semi-diretas sem bisel; as restaurações diretas sem bisel foram inferiores às demais. Para resistência à fratura de restaurações, as restaurações com bisel foram superiores às demais para ambos os tempos de armazenamento, e não diferiram dos dentes hígidos em 24 horas. Para os 2 testes citados, os grupos 1, 2 e 4 apresentaram redução significativa do seu desempenho após 6 meses de armazenamento e termociclagem. A avaliação de fenda em esmalte mostrou que em 24 horas não houve diferença entre os grupos. Após 6 meses, as restaurações com bisel continuaram livres de fenda, enquanto as sem bisel apresentaram fenda na maioria dos espécimes. A análise de correlação de Pearson mostrou resultado significativamente positivo para os 2 testes de resistência. Concluiu-se que o tempo de armazenamento e termociclagem foram fatores significativos na redução da performance adesiva; a realização de bisel influenciou de forma positiva na melhora do desempenho das restaurações em todos os testes empregados; as restaurações semi-diretas de resina composta, de modo geral, não foram superiores às diretas.
Neves, Ricardo Simões. "Estudo de parâmetros eletrocardiográficos e de pressão arterial durante procedimento odontológico restaurador sob anestesia local com e sem vasoconstritor em portadores de doença arterial coronária." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-06022007-142629/.
Повний текст джерелаWe enrolled 62 patients with positive exercise stress test who presented with stable angina and were receiving drug therapy. All had a coronary angiography screening showing >70% obstruction in at least one of the main coronary arteries. The study aimed to compare electrocardiographic and blood pressure parameters during restorative dentistry procedure under local anesthesia, both with and without vasoconstrictor, in the presence of coronary artery disease. Ages ranged from 39 to 80, (mean ± SD) 58.7±8.8 years, 51 (82.3%) of them were male. Thirty patients were randomly assigned to receive 2% lidocaine local anesthesia with 1:100,000 epinephrine, the others receiving 2% lidocaine without vasoconstrictor. All the patients underwent ambulatory blood pressure and 24-hour Holter monitoring, beginning two hours ahead of the dental procedure. Recording were made during (1) baseline - 60-minute period before dental procedure began; (2) procedure - from beginning of anesthesia until the end of the procedure; and (3) subsequent 24-hour period. Analysis of variance with repeat measures showed significant diastolic and systolic blood pressure increases from baseline to the period of the procedure, in the two study groups (approximately 14 mm Hg, and 5 to 7 mm Hg, respectively); both in a separate analysis and in a comparative analysis no significant difference between them could be confirmed. Heart rate did not change in neither of the two groups. ST-segment >1 mm depression was detected in 10 (17.9%) patients; all these events occurred at least two hours after the end of the dentistry procedure. Premature supraventricular systoles and/or premature ventricular systoles in a greater number than 10/hour were seen in 17 (30.4%) patients in the 24-hours period after the procedure; during the procedure they occurred in 7 (12.5%) patients, of whom 4 (13.8%) were in the group without, and 3 (11.1%) in the group with vasoconstrictor. The Fisher\'s exact test revealed no difference between the groups. We concluded that there was no difference of blood pressure, heart rate, evidence of ischemia or arrhythmia episodes between the groups. Thus, the associated use of vasoconstrictor proved to be safe within the limits of this study
Costa, Thays Regina Ferreira da. "AVALIAÇÃO CLÍNICA E LABORATORIAL DE RESTAURAÇÕES COM RESINA BULK FILL INSERIDAS DE FORMA INCREMENTAL OU EM INCREMENTO ÚNICO." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2016. http://tede2.uepg.br/jspui/handle/prefix/1706.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Objectives: In the experiment 1, an in vitro study, the aim was to evaluate the microtensile bond strength (μTBS), nanoleakage (NL) and degree of conversion (DC) of different bulk-fill resin-based materials placed in bulk [BUL] or incrementally [INC] and in the experiment 2, a double blind randomized clinical trial, split mouth for each adhesive system, was conducted to compare the postoperative sensitivity of a bulk-fill resin-based material placed in BUL or INC in posterior composite resin restorations bonded with two different adhesive strategies (self-etch and etch-and-rinse). In the experiment 3, the objective was to describe the clinical steps involved in the placement of posterior composite resin restorations with bulk-fill resins. Materials and methods: In experiment 1, flat dentin surfaces of thirty extracted teeth were exposed and then were randomly assigned into 6 experimental conditions (n = 5). Composite buildups were constructed according to the combination of the main factors filling technique (BUL [single 4-mm thick layer] and INC [two 2-mm thick layers]) and composite resin (Filtek Bulk Fill Flow [FIL], 3M ESPE, Tetric N-Ceram Bulk Fill [TET], Ivoclar Vivadent and SureFil SDR Flow [SDR], Dentsply Caulk) with their respective conventional adhesive systems. Teeth were sectioned to obtain bonded sticks (0.8 mm2) to be tested in tension (0.5 mm/min) for μTBS. For NL, two bonded sticks from each tooth were placed in 50% silver nitrate and polished with SiC paper and then analyzed using scanning electron microscopy. For DC, three specimens per tooth were analyzed in micro-Raman spectroscopy. The mean μTBS (MPa) NL (%) and DC (%) data were submitted to a two-way ANOVA and Tukey´s test (α = 0.05). In experiment 2, a total of 236 posterior dental cavities with a cavity depth of at least 3 mm (72 participants) were randomly divided in four groups (n=59). Restorations were bonded either with the etch-and-rinse Tetric N-Bond (Ivoclar Vivadent) or with the self-etch Tetric N-Bond SE (Ivoclar Vivadent). The composite resin TET (Ivoclar-Vivadent) was placed either INC or in BUL techniques. Two experienced and calibrated examiners performed the evaluation of the restorations using the FDI criteria after one week of clinical service. Spontaneous postoperative sensitivity was assessed using a 0-4 and a 0-100 numerical rating scale (NRS), and a 0-10 visual analog scale (VAS) up to 48 h after the restorative procedure and one-week later. Results: In experiment 1, higher μTBS values (mean ± SD) were observed for FIL (57.5 ± 3.5) in the BUL technique when compared to other groups inserted in BUL (TET 52.6 ± 7.8; SDR 54.9 ± 4.3) or INC filling (FIL 51.8 ± 4.1; TET 47.9 ± 4.5; SDR 49.7 ± 3.8) - p > 0.05. No statistically significant difference was observed among the materials tested (p > 0.05). No significant difference was 9 detected in NL (FIL [7.6 ± 1.9 INC and 10.3 ± 2.3 BUL]; TET [10.9 ± 3.3 INC and 12.8 ± 4.0 BUL]) and DC (FIL [87.9 ± 7.0 INC and 85.6 ± 8.4 BUL]; TET [92.2 ± 3.4 INC and 83.3 ± 5.4 BUL]) between filling technique (p > 0.05). Higher NL values (13.0 ± 3.6 INC and 14.8 ± 2.5 BUL [p = 0.001]) and lower DC (49.7 ± 8.3 INC and 48.6 ± 4.0 BUL [p = 0.003]) were found when SDR was used. In experiment 2, neither the restorative technique nor the adhesive strategy affected the risk (p > 0.49) and intensity of spontaneous postoperative sensitivity (p > 0.38). The overall risk of postoperative sensitivity observed was 20.3% (95% CI 15.7 to 25.9) and occurred practically within the 48 h after the restorative procedure. Conclusions: The filling technique did not affect the μTBS, NL and DC of the bulk fill materials tested in this study. Clinically, the use of single increment of this new bulk-fill material, even in deep restorations, did not generate more postoperative sensitivity when compared to the incremental filling technique.
Objetivos: No experimento 1, um estudo in vitro, o objetivo foi avaliar a resistência de união (RU), nanoinfiltração (NI) e grau de conversão (GC) de diferentes resinas compostas bulk fill inseridas de forma incremental (INC) ou em incremento único (UNI) e no experimento 2, um ensaio clínico randomizado duplo-cego de boca dividida para cada sistema adesivo, foi comparar a sensibilidade pós-operatória em restaurações realizadas com resina bulk fill em dentes posteriores variando a técnica de inserção (UNI e INC) e a estratégia adesiva (convencional e autocondicionante). No experimento 3, o objetivo foi realizar um relato de caso clínico demonstrando os passos clínicos envolvidos na execução de restaurações posteriores com uma resina bulk fill. Material e métodos: No experimento 1, trinta terceiros molares tiveram sua dentina planificada e exposta, foram divididos aleatoriamente em seis condições experimentais (n=5) e restaurados de acordo com a combinação dos fatores: técnica de inserção (UNI [uma camada de 4 mm] ou INC [2 camadas de 2 mm cada]) e resina composta (Filtek Bulk Fill Flow [FIL], 3M ESPE, Tetric N-Ceram Bulk Fill [TET], Ivoclar Vivadent e SureFil SDR [SDR], Dentsply Caulk) com seus respectivos sistemas adesivos convencionais. Os dentes foram seccionados para obtenção de palitos (0,8 mm2) para serem testados em microtração (0,5 mm/min) para RU. Para NI, dois palitos de cada dente foram infiltrados com nitrato de prata amoniacal 50%, revelados, polidos com lixas de carbeto de silício com granulação crescente e avaliados em microscopia eletrônica de varredura. Para GC, três palitos por dente foram levados ao micro-Raman para análise do grau de conversão. As médias de RU (MPa), NI (%) e GC (%) foram submetidos a uma análise de variância de dois fatores e Teste de Tukey (α = 0,05). No experimento 2, setenta e dois participantes tiveram 236 cavidades com profundidade mínima de 3 mm randomicamente divididas em 4 grupos experimentais (n=59). Os sistemas adesivos utilizados foram o convencional Tetric N-Bond (Ivoclar Vivadent) ou o autocondicionante Tetric N-Bond SE (Ivoclar Vivavent). A resina composta utilizada foi TET (Ivoclar Vivadent), que foi inserida de forma INC ou UNI. Dois avaliadores experientes e calibrados avaliaram as restaurações utilizando os critérios da FDI uma semana após a inserção das restaurações. A sensibilidade pós-operatória imediata foi mensurada utilizando duas escalas numéricas, de 0-4 e de 0-100 e uma escala VAS de 0-10 até 48 horas após o procedimento restaurador e uma semana após. Resultados: No experimento 1, maiores valores de RU (média ± DP) foram observados para a FIL inserida na técnica UNI (57,5 ± 3,5) em comparação com os outros grupos: UNI (TET 52,6 ± 7,8; SDR 54,9 ± 4,3) ou INC (FIL 51,8 ± 4,1; TET 47,9 ± 4,5; SDR 49,7 ± 3,8) - p > 0,05. Não foi observada diferença estatisticamente 7 significante entre os materiais (p > 0,05). Para NI (%) (FIL [7,6 ± 1,9 INC e 10,3 ± 2,3 UNI]; TET [10,9 ± 3,3 INC e 12,8 ± 4,0 UNI]) e GC (%) (FIL [87,9 ± 7,0 INC e 85,6 ± 8,4 UNI]; TET [92,2 ± 3,4 INC e 83,3 ± 5,4 UNI]), não foram observadas diferenças entre as técnicas de inserção do material (p > 0,05). Maiores valores de NI (13,0 ± 3,6 INC e 14,8 ± 2,5 UNI [p = 0,001]) e menores valores de GC (49,7 ± 8,3 INC e 48,6 ± 4,0 UNI [p = 0,003]) foram encontrados para resina SDR. No experimento 2, nem a técnica de inserção e nem a estratégia adesiva alterou o risco de sensibilidade pós-operatória (p > 0,49) e a intensidade da sensibilidade (p > 0,38). O risco geral de sensibilidade pós-operatória observado foi de 20,3% (IC 95% 15,7 - 25,9) e ocorreu praticamente dentro das 48 horas após o procedimento restaurador. A técnica operatória mostrou-se simples e mais rápida de execução que a realizada de acordo com o protocolo de inserção incremental. Conclusões: A técnica de inserção não afeta a RU, NI e GC dos materiais utilizados no presente estudo. Clinicamente, o uso de resinas bulk fill inseridas em incremento único, mesmo em cavidades profundas, não aumenta a sensibilidade pós-operatória quando comparado com a inserção incremental, independentemente da estratégia adesiva utilizada.
Correr-Nolasco, Gisele Maria. "Degradação de materiais restauradores resinosos e do esmalte deciduo e permanente em soluções simuladoras da dieta." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288592.
Повний текст джерелаTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A cavidade bucal é considerada um ambiente agressivo onde a estrutura dentária e os materiais restauradores estão constantemente sujeitos a desafios térmicos, mecânicos e quÃmicos. A associação destes fatores está diretamente relacionada à longevidade/estabilidade das restaurações, bem como à preservação da estrutura dentária. A exposição da estrutura dentária e dos materiais restauradores resinosos aos agentes da dieta pode causar erosão dental, amolecimento e aumento da rugosidade de restaurações resinosas, deixando-as mais susceptÃveis ao desgaste. Dessa forma, os objetivos desta tese fundamentada em três capÃtulos foram: (1) avaliar o efeito do armazenamento em longo prazo em diferentes soluções simuladoras da dieta na rugosidade superficial de materiais restauradores resinosos; (2) avaliar o efeito da associação dos desafios erosivo e abrasivo no desgaste do esmalte decÃduo e permanente; (3) avaliar o efeito da associação dos desafios corrosivo e abrasivo no desgaste de materiais restauradores resinosos. No capÃtulo 1, sessenta amostras de diferentes materiais restauradores (Filtek Z250, Esthet X, Filtek Flow, Dyract AP e Vitremer) foram armazenadas em 5 lÃquidos simuladores da dieta (água destilada, ácido lático, ácido cÃtrico, refrigerante a base de cola (Coca-Cola) e álcool) por até 6 meses. A rugosidade superficial das amostras foi mensurada após o polimento (baseline), 1 semana, 1 mês, 3 meses e 6 meses de armazenamento. Houve aumento significativo na rugosidade superficial apenas para Esthet X armazenado em Coca-Cola e em ácido cÃtrico após 1 e 3 meses, respectivamente; e para Dyract AP armazenado em água destilada após 6 meses. No capÃtulo 2, foram obtidas amostras planas de esmalte decÃduo e permanente (n=10), as quais foram submetidas ao desgaste (100.000 ciclos a 1,9 Hz) em meio neutro (água deionizada) e meio ácido (ácido cÃtrico). Antes e após o desgaste, as amostras foram analisadas em perfilÃ'metro (MTS 3D Profiler). A alteração do volume e a profundidade máxima do desgaste foram quantificadas utilizando o software Ansur 3D. O esmalte decÃduo apresentou maior desgaste que o esmalte permanente, independentemente do meio. O meio ácido proporcionou maior desgaste do que o meio neutro (p<0,05). Diferença significativa entre meio neutro e ácido foi observada apenas para o esmalte decÃduo. No capÃtulo 3, dez amostras de cada material [Filtek Supreme (S), Point 4 (P), Dyract AP (D) e Fuji II LC (F)] foram confeccionadas e submetidas ao desgaste (100.000 ciclos a 1,9 Hz) em meio neutro (água) e meio ácido (ácido cÃtrico). Antes e após o desgaste, as amostras foram analisadas em perfilÃ'metro (MTS 3D Profiler). A alteração do volume e a profundidade máxima do desgaste foram quantificadas utilizando o software Ansur 3D. Diferença significativa no desgaste dos materiais foi observada (S=P
Materiais Dentarios
Doutor em Materiais Dentários
Neves, Itamara Lucia Itagiba. "Monitorização materno-fetal da portadora de doença valvar reumática durante procedimento odontológico sob anestesia local." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-18042007-090959/.
Повний текст джерелаDuring pregnancy, the organic systems of a woman are subjected to physiological modifications consequential to hormonal, anatomic and metabolical alterations. The most significant modification in the circulatory system is an increased cardiac output from the first three months of gestation. Women with heart disease may present with severe complications during the gestational period, because of inappropriate adaptation of her body to this hemodynamic overload, even those patients who are thought to have an appropriate functional capacity during early pregnancy. There are scant studies in the literature on the effects of local anesthetics, with and without vasoconstrictor, used in dental procedures on the cardiovascular variables of pregnant women with valvar disease, as well as on their concepti. Driven by this shortage, we decided to have this subject studied, by assessing and analyzing cardiotachographic parameters, such as heart rate, fetal motility and uterine contractions, in addition to blood pressure and electrocardiographic variables, in pregnant women with rheumatic valvar disease who undergo local anesthesia with lidocaine, with and without vasoconstrictor, during restorative dental procedure. For this, 31 rheumatic heart disease patients who were in their 28th to 37th week of gestation, had 24-hour ambulatory monitoring of their blood pressure (BP) and Holter electrocardiography (Holter-ECG), and cardiotocography (CTG), performed during: (1) baseline - 60 minutes before the procedure for BP and Holter- ECG monitoring, and 20 minutes before the procedure for CTG; (2) procedure - 56±15.5 minutes (mean±SD); (3) post-procedure - 20 minutes; and (4) mean 24-hour heart rate and extrasystoles measurement, and mean wake and sleeping periods BP monitoring. Variation of the above variables was analyzed in two groups, one with infusion of a 2% solution of lidocaine with vasoconstrictor, and the other with infusion of a 2% solution of lidocaine with epinephrine 1:100.000. The maternal heart rate values obtained during the procedure showed a significant reduction only in comparison with the other time periods (P<0.001). The comparison of the two groups did not reveal any significant difference (P>0.05). Cardiac arrhythmia was detected in 9 (29.0%) patients, 7 of them (41.8%) from the group who received anesthetics with epinephrine. Maternal blood pressure did not show any significant difference neither between time periods, nor between groups (P>0.05). The same occurred in the comparative analysis of the fetal parameters obtained during CTG -number of contractions, level and variability from baseline, number of fetal heart rate accelerations and fetal reactivity pattern. Our conclusion was that the use of 2% solution of lidocaine in association with epinephrine proved safe during dental procedure in pregnant women with rheumatic valvar cardiopathy.
Martins, Thiago Marchi [UNESP]. "Resposta dos tecidos periodontais frente ao recobrimento de cavidades radiculares restauradas por materiais resinosos: estudo histomorfométrico em cães." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/96160.
Повний текст джерелаUniversidade Estadual Paulista (UNESP)
O objetivo do trabalho foi avaliar histomorfometricamente em cães a resposta dos tecidos periodontais frente ao recobrimento de cavidades radiculares classe V restauradas ou não com materiais resinosos. Após levantamento de retalho mucoperiostal, defeitos ósseos de 5 x 5 mm foram criados na face vestibular de 15 caninos de 4 cães, seguidos de preparos cavitários de 3 x 3 x 1 mm na superfície radicular. Antes do reposicionamento do retalho para sua posição original com o objetivo de recobrir o defeito ósseo, as cavidades do grupo teste foram restauradas com resina composta micro-híbrida (RC) ou cimento de ionômero de vidro modificado por resina (RMGIC) e as do grupo controle (CO) permaneceram sem restauração. O sacrifício dos animais foi realizado aos 90 dias pós-operatórios. Foram obtidos cortes histológicos seriados vestíbulo-linguais, corados com HE e Tricrômico de Masson. As secções mais centrais foram selecionadas para a análise histomorfométrica. As medidas histológicas foram submetidas à análise estatística por meio dos testes: teste exato de Fisher, teste de Friedman, ANOVA e teste de Kruskal Wallis, considerando o nível de significância de 5%. Histologicamente observou-se migração apical do tecido epitelial (TE) sobre os materiais restauradores (RMGIC e RC). O grupo CO apresentou inserção conjuntiva (IC) significativamente maior (p<0.05) em relação aos grupos testes RMGIC e RC e regeneração óssea significativamente maior (p<0.05) em relação ao grupo teste RMGIC. Em todos os grupos observou-se histologicamente um infiltrado inflamatório crônico mais pronunciado no terço cervical (TC). Os resultados deste estudo permitiram concluir que os materiais restauradores resinosos empregados mostraram-se biocompatíveis, podendo ser uma alternativa na restauração de abrasões cervicais e/ou cáries profundas previamente ao procedimento cirúrgico de recobrimento radicular.
This study analyzed the periodontal tissue response to coverage of root cavities filled with resin materials in dogs by histomorphometric evaluation. A mucoperiosteal flap was raised on 15 canines teeth of 4 dogs and bone defects measuring 5x5mm were created on the buccal aspect of canines, followed by cavity preparations measuring 3x3x1mm on the root surface. Before repositioning of the flap in its original position to cover the bone defect, the cavities of the study group were filled with microhybrid composite resin (CR) or resin-modified glass ionomer cement (RMGIC), and the control group (CO) was not filled. The animals were sacrificed at 90 days postoperatively. Serial buccolingual histological sections were achieved and stained with HE and Masson trichrome. The most central sections were analyzed for histomorphometric analysis. The histological measurements were submitted to statistical analysis by the Fisher's exact test, Friedman test, ANOVA and Kruskal Wallis test, at a significance level of 5%. Histological analysis revealed apical migration of the epithelial tissue (ET) over the restorative materials (RMGIC and CR). Group CO presented significantly larger (p<0.05) connective tissue attachment (CTA) than study groups RMGIC and CR, and significantly larger bone regeneration (p<0.05) compared to the study group RMGIC. All groups revealed chronic inflammatory infiltrate, more remarkably at the cervical third (CT). The results of this study allowed the conclusion that resin restorative materials employed were biocompatible and may be an option for restoration of cervical abrasions and/or deep caries before surgical procedure for root coverage.
Favarão, Jamille. "Estudo clínico randomizado de diferentes adesivos autocondicionantes. Análise da resistência de união." Universidade Estadual do Oeste do Parana, 2015. http://tede.unioeste.br:8080/tede/handle/tede/660.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
Purpose: Evaluate the bond strength to dentin of three different bonding system (conventional 3 steps, two steps and universal self-etching) after 1 week and 6 months in oral environment. Methods: Class I cavities were prepared in third molars of 30 patients, that were randomly divided into 3 groups according to the adhesive system used, Scotchbond Multipurpose (SM), Clearfil Protect Bond (CF) and Scotchbond Universal (UN) and subdivided in two groups according to the length of stay in the oral environment, 1 week (1S) and 6 months (6M). After standing in the oral environment, teeth were extracted, cut into sticks and subjected to microtensile test. Data were submitted to Shapiro-Wilk test and ANOVA (two-way), followed by Tukey post hoc, significance level of 5 % and the fracture pattern analyzed. Results: Average values (MPa ± SD) of the groups were SM-1S: 39.50 ± 7.92; 6M-MS: 29.68 ± 1.82; CF-1S: 30.48 ± 1.44 CF-6M: 28.59 ± 4.13; UN-1S: 30.62 ± 3.24; UN-6M: 26.71 ± 2.05. There was significant difference for both, the adhesive system factor and the time factor. The SM -1S group showed resistance values significantly higher than the other groups, with no differences between them. The fracture analysis showed predominance of mixed fracture for group 1 and adhesive fracture to the other groups. Clinical Significance; The findings of this study indicate that the studied adhesive systems presented similar bond strength after 6 months in the oral environment
Objetivo: Avaliar a resistência de união à dentina de três diferentes sistemas adesivos (convencional de 3 passos, autocondicionante de 2 passos e universal) após 1 semana e 6 meses em meio bucal. Métodos: Foram prepararas cavidades Classe I em terceiros molares de 30 pacientes, distribuídos aleatoriamente em 3 grupos de acordo com o sistema adesivo utilizado, Scotchbond Multipurpose (SM), Clearfil Protect Bond (CF) e Scotchbond Universal (UN) e, subdividos em dois grupos de acordo com o tempo de permanência em meio bucal, 1 semana (1S) e 6 meses (6M). Após permanência em meio bucal os dentes foram extraídos, seccionados em palitos e submetidos ao teste de microtração. Os dados foram submetidos ao teste de Shapiro-Wilk e ao teste de ANOVA (dois critérios), seguidos do teste post hoc de Tukey, nível de significância de 5% e o padrão de fratura analisado. Resultados: Os valores médios (MPa ± DP) dos grupos foram, SM-1S: 39,50 ± 7,92; SM-6M: 29,68 ± 1,82; CF-1S: 30,48 ± 1,44 CF-6M: 28,59 ± 4,13; UN-1S: 30,62 ± 3,24; UN-6M: 26,71 ± 2,05. Houve diferença significante tanto para o fator sistema adesivo, como para o fator tempo. O grupo SM-1S apresentou valores de resistência a microtração significativamente maiores que os demais grupos, que não apresentaram diferenças entre si. A análise de fratura mostrou predominância de fratura mista para o grupo SM-1S e fratura adesiva para os demais grupos. Significado Clínico: Os achados desse estudo indicam que os sistemas adesivos estudados apresentaram resistência de união semelhante após 6 meses em meio bucal.
Jardim, Juliana Jobim. "Remoção parcial de tecido cariado em lesões de cárie profundas de dentes permanentes." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/24665.
Повний текст джерелаSilva, Rafael Menezes. "Avaliação clínica randomizada de restaurações de classe II em dentes permanentes de ART e de resina composta." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/25/25148/tde-24052018-180804/.
Повний текст джерелаThis study evaluated the effectiveness of Class II restorations through the Atraumatic Restorative Treatment (ART) technique, with additional retentions in the proximal boxes, in permanent teeth, using high viscosity glass ionomer cement (HVGIC), as compared to restorations of composite resin. An epidemiological examination was conducted in a larger and representative population of the participants of study. One hundred and thirty three participants, aged 8 to 28 years, with good general health with 1 to 2 class II cavities in permanent teeth without pulp involvement and tooth pain were included in this study, with was approved by the Ethics Committee under the number: CAAE: 24012913.0.1001.5417. Seventy-seven restorations were made with each restorative material (Equia Fil-GC Corporation and Z350-3M). Restorations were evaluated at 6, 12, and 24 months by the criteria of ART and the modified United States Public Health Service (USPHS). Spearman Correlation and Multiple Linear Regression were performed between the variables tooth pain, visible plaque index (VPI), gingival bleeding index (GBI) and the CAST (The Caries Assessment Sprectrum and Treatment) and DMFT (Decayed, Missing and Filled teeth) obtained at the epidemiological survey using the Statistica program 7.1. As for restorative effectiveness, data were analyzed using the Mann-Whitnney, Chi-square, Fisher\'s Exact, Chi-square tests with linear trend and Logistic Regression by Enter method, where relevant (p<0.050). The Kaplan-Meier test evaluated the survival rates of the restorations in relation to the ART and modified USPHS criteria. The Log-Rank test compared the survival curves. From the CAST index (1.53; 2.17) it was possible to extract the DMFT (0.58; 1.32) which presented lower specificity and sensitivity in caries detection. The success rates for composite resin restorations were 100% (6 months), 98.7% (12 months) and 91.5% (24 months) for both assessment criteria and for ART restorations were the same for 6 months (98.7%) and 12 months (95.8%) and for 24 months were 92% when using the criteria of modified USPHS and 90.3% when using the criteria of ART, and no statistical difference was observed (p=0.466). The variables gender, locality, age, DMFT, VPI, GBI, toothache, occlusion, proximal contact, cavity size, anesthesia and cooperation of the participant did not present a statistical association with the success rates of the restorations (p>0.050). After 24 months, the VPI and GBI variables did not present a statistically significant odds ratio (OR) for ART restorations (p>0.050). ART restorations presented a lower survival rate by the criteria of ART (83.7%) when compared to the criteria of USPHS modified (87.8%), after 24 months (p=0.051). The survival of composite resin restorations was 90.7% for both evaluation criteria. It was concluded that there is no difference in the success rate of class II restorations of ART with HVGIC, in permanent teeth, with proximal retention grooves, compared to class II resin composite restorations, after 24 months.
Valera, Fabiano Bassalobre. "Influência do bisel na resistência à fratura de dentes restaurados com resina composta." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/25/25131/tde-05032008-143223/.
Повний текст джерелаThe fracture resistance of upper premolar teeth with and without cavosurface bevel, restored with composite resin material was evaluated. Ninety upper premolar teeth were divided into 9 groups. The group 1, considered as a positive control, was composed of sound teeth. Groups 2 to 9 receive Class II MOD preparation cavities with standardized measures. Groups from 6 to 9 had the roof of the pulp chamber removed. In groups 2, 3, 6, and 7, the cavosurface angle was evident and without bevel; groups 4 and 8, a concave bevel around the entire cavity; groups 5 and 9, the bevel was only placed in the oclusal portion of the cavity. Teeth in groups 2 and 6 were not restored, and considered as negative controls. In the other groups, cavities were directly restored with an adhesive resin system. All specimens were evaluated until load to fracture in a Universal Testing Machine (Emic DL 2000), with a load cell of 500Kgf, maximum load of 450Kgf, and 0,05kgf of standard error. Results were submitted to one-way analysis of variance and Tukey\'s test for group comparisons. There was a significant difference among the studied groups regarding the different treatments on the cavosurface angle (independent variable) and the fracture resistance (dependent variable) (p<0.05). Removal of tooth structure through cavity preparation diminished the fracture resistance values, being that in more extensive preparation (removal of the roof of pulp chamber), this value was lower. The bevel placed around the entire cavosurface angle in Class II cavities significantly increased the fracture resistance, when compared to teeth with a clear cavosurface angle but without bevel, either in teeth with or without removal of the roof of pulp chamber. Besides, teeth with bevel around the entire cavosurface angle with or without endodontic therapy showed the best fracture patterns, almost completely preserving tooth integrity.
Trevisan, Tamara Carolina. "Avaliação da resistência de união de reparos em resinas compostas convencionais e bulkfill /." Araraquara, 2016. http://hdl.handle.net/11449/138571.
Повний текст джерелаBanca: Weber Adad Ricci
banca: Gustavo Moncada
Resumo: Técnicas de reparos de restaurações vêm sendo amplamente utilizadas como um tratamento alternativo e conservador á substituição de restaurações defeituosas. O conhecimento do material a ser reparado e de um protocolo ideal, permitiria uma melhor relação biomecânica entre dente e material restaurador e possibilitaria técnicas eficazes e menos invasivas. O objetivo do presente estudo foi avaliar a resistência de união de reparo de diferentes resinas compostas, sob a influência de tratamentos de superfície, especialmente em relação a uma nova proposta comercial denominada de resinas "bulk fill". Para isso, foram confeccionados corpos de prova com diâmetro de 8mm por 4mm de altura, de diferentes classes de resinas compostas: Z350XT, Z250XT, Grandio, Epricord, Tetric Bulkfill, Xtra Fill e Sonic Fill (n=15). Estes passaram por processo de envelhecimento artificial, realizado por meio de armazenamento em estufa com saliva artificial por 3 meses, sendo realizada a troca da saliva semanalmente, e finalizado com termociclagem 5o e 55ºC por 20 segundos em água para 1000 ciclos. Foram distribuídos aleatoriamente em três subgrupos, de acordo com o tratamento de superfície (n=5): G1- Controle- sem tratamento prévio; G2- Jateamento óxido alumínio; G3- Jateamento óxido de sílica. Após a aplicação dos respectivos tratamentos de superfície, cada espécime foi reparado com resina composta Z100 em incrementos de aproximadamente 2mm e fotopolimerizado em um aparelho de fotopolimerização convencion... (Resumo completo, clicar acesso eletrônico abaixo)
Mestre
Hesse, Daniela. "Selamento de lesões de cárie em dentina de dentes decíduos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/23/23132/tde-08052012-160034/.
Повний текст джерелаThe aim of this in vivo study was to assess the effect of pit and fissure sealants in arresting dentinal caries lesions compared to conventional restorative treatment. Forty two primary teeth from thirty six patients had been selected. Inclusion criteria considered the presence of one or more primary molars with occlusal carious lesion reaching dentine with an opening in enamel not wider than 3 mm diameter, measurement obtained with a millimeter probe. Radiographically, the lesion should be in the outer half of dentine. The patients were randomly allocated in two groups: restoration with composite resin, after partial removal of the carious dentine (control group) and sealant application (experimental group). The patients were submitted to clinical and radiographic (bitewing) evaluation after 6, 12 and 18 months. The scores for clinical assessment were: total retention, considered as success or partial and total loss considered as failure. When integrity failures were found during the follow-up visits, the reapplication (repair) of the sealant was done, but the tooth was excluded from future analysis. In radiographic method, teeth were classified as absence or presence of caries progression. One tooth per patience was randomly selected for statistical analysis. Six exfoliated teeth were collected and processed for scanning electron microscopy (SEM) analysis. Kaplan-Meier survival analysis, Fisher\'s Exact test and logistic regression test were calculated in each evaluation period (p<0.05). Control group showed better results after 18 months with regard to clinical evaluation (p=0.0025). In both groups, all cases showed no signs of carious progress in the radiographic exam for all periods of assessment. The interface tooth / restorative material analysis by SEM allowed a qualitative evaluation of the hybrid layer and adhesive system tags formation, as well as the visualization of bacteria in infected and affected dentin. The experimental group showed more areas of interfacial gaps between the sealant and dentin, while in the control group we observed the formation of more homogeneous hybrid layer tags of adhesive system in affected dentin. We conclude that, although failures were observed, the pit and fissures sealant may contribute to dentinal caries lesion arrestment in primary teeth, as long as it is repaired, consisting in a more conservative treatment than conventional restoration.
Quaresma, Sergio Eduardo Tricta. "Efeitos do vasoconstritor em procedimentos dentais de restaurações e extrações em IC: resultados de um estudo prospectivo, randomizado, duplo-cego (Teeth-HF Study)." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/5/5131/tde-07022019-152400/.
Повний текст джерелаBackground: The number of patients with heart failure (HF) increases annually over the world. Oral diseases have been related to, and have shown high prevalence among this population. These patients need dental care. Using local anesthesia with vasoconstrictor for dental treatments is still controversial in patients with HF because it may generate adverse cardiovascular effects. Goal: To analyze pain and hemodynamic changes in patients with heart failure submitted to a dental procedure under local anesthesia with or without epinephrine. Methods: Prospective, parallel group, controlled, double-blind study , with heart failure patients, ejection fraction < 45%, NYHA class II and III / IV and with optimized therapy, were randomized to dental procedures (dental extraction or restoration) using 1,8 to 3.6ml of lidocaine without epinephrine (LSE) or lidocaine with epinephrine (LCE). ( Lidocaine 2% epinephrine 1:100.000). Results: Seventy two patients (50 ± 10 years, 62% male, 27% ischemic) were allocated to LSE (n = 36) or LCE (n = 36). It was observed a significant increase in pain , among patients that had dental extractions in the LSE group in comparison to LCE. No differences were observed in blood pressure, heart rate and pain scores before, during and after dental procedures in both groups. However, blood pressure increased and heart rate significantly reduced in relation to the baseline phase during and after the procedure in both groups when they were analyzed separately. Conclusion: Lidocaine with epinephrine (LCE) has shown to be more effective for pain control in heart failure patients. Concerning hymodinamic changes there was no difference between groups with or without epinephrine, and the treatment did not cause undesirable adverse cardiovascular effects.
Diaz-Siohl, Jesus Alfredo. "An evaluation of solder joints of palladium-based alloys produced by infrared energy." 1988. http://books.google.com/books?id=oEY_AAAAMAAJ.
Повний текст джерелаWiley, Paul M. "Evaluation of cervical retention in Class V composite restorations using a new dentin adhesive." 1989. http://books.google.com/books?id=q4U9AAAAMAAJ.
Повний текст джерелаZajía, Regina M. "Clinical effectiveness of bonded amalgam restorations for cracked tooth syndrome a thesis submitted in partial fulfillment ... for the degree of Master of Science in Restorative Dentistry /." 2000. http://catalog.hathitrust.org/api/volumes/oclc/68896422.html.
Повний текст джерелаVinci, Richard C. "Stability of proximal relationships in class 2 composite resin restorations a clinical study : a thesis submitted in partial fulfillment ... restorative dentistry, operative ... /." 1985. http://books.google.com/books?id=jJE9AAAAMAAJ.
Повний текст джерелаGolnick, Jason M. "Comparison of microleakage in restorations subjected to thermal and mechanical stresses a thesis submitted in partial fulfillment ... for the degree of Master of Science in Pediatric Dentistry ... /." 2003. http://catalog.hathitrust.org/api/volumes/oclc/68962474.html.
Повний текст джерелаWang, Jen-Chyan. "Quantitative evaluation of proximal contacts in Class 2 composite resin restorations a clinical study : a thesis submitted in partial fulfillment ... restorative dentistry, operative ... /." 1988. http://books.google.com/books?id=QXc9AAAAMAAJ.
Повний текст джерелаKeall, Christopher L. "Quality assessment of complex restorative procedures." 1985. http://books.google.com/books?id=_pM9AAAAMAAJ.
Повний текст джерелаKoukopoulou, Elisabeth. "Shade matching with the use of the intraoral video camera a thesis submitted in partial fulfillment ... for the degree of Master of Science in Restorative Dentistry ... /." 1997. http://catalog.hathitrust.org/api/volumes/oclc/68799845.html.
Повний текст джерелаAlRasheed, Rawan S. "In vitro evaluation of polymerization energy for bulk fill composites." Thesis, 2016. http://hdl.handle.net/1805/10275.
Повний текст джерелаRecently, the concept of “bulk-fill” resin-based composites (RBCs) has been re-emphasized, with claimed improvements in depth of cure (DOC) with similar mechanical properties and comparable adaptation to walls and margins relative to conventional composite. More research is needed to carefully examine the properties of these new materials. The objective of this study was to measure the light energy, microhardness (VHN), and elastic modulus across the depth of one conventional and three bulk-fill RBCs. Materials and Methods: Three commercially available bulk-fill RBCs (Tetric EvoCeram Bulk Fill [TE], SonicFill [SF], X-tra fill[XF]) and one conventional RBC (Premise [PR]) were evaluated (n = 10). DOC (using Vickers’s microhardness), elastic modulus (using atomic force microscopy), and the mean irradiance and total light energy transmitted through different thicknesses of RBC were measured by a spectrometer. The effects of group, location, and curing depth on VHN were analyzed using mixed-model ANOVA. Elastic modulus and light energy comparisons were made using two-way ANOVA, with a significance level of 5 percent. Results: There was a significant difference in the depths for the mean irradiance and total energy between different depths in all materials. All materials achieved the manufacturers’ claimed DOC. XF had the highest DOC with 7 mm and a light energy of 0.56± 0.02 J/cm2 at 7 mm. PR had the lowest DOC with 3 mm and a light energy of 0.84 ±0.12 J/cm2 at 3 mm. The elastic modulus showed significant variation in depth profiles that were different than the DOC. Significance: The manufacturers’ claims for bulk-fill DOC were achieved using a microhardness method. However, this method failed to detect the quality of the polymerization. Assessment of the elastic modulus using AFM is a promising method for greater understanding of the polymerization.
Waal, Andre Stephanus de. "Comparison of an intra-oral approach using a contra-angle hand piece with the transbuccal technique for mandibular angle fracture repair." Thesis, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_9093_1298958860.
Повний текст джерелаCarvalho, Inês Filipa Alves de. "Revisão sistemática do desempenho clínico de restaurações unitárias executadas em CAD-CAM." Master's thesis, 2016. http://hdl.handle.net/10400.14/23841.
Повний текст джерелаIntroduction: Owing to an increased demand for safe and esthetically pleasing dental materials, ceramic materials have been developed and optimized to rehabilitate anterior and posterior teeth. This evolution in ceramic materials is directly related to the development of sophisticated processing technologies and systems into Dental Medicine, particularly – CAD-CAM technology. The aim of this work is to do a systematic review outlining long-term clinical survival rates of single-tooth restorations fabricated with CAD-CAM technology with a minimum follow-up of 3 years. This study sought to determinate and to compare the frequency of failures of partial and full-coverage CAD-CAM crowns, as well as the CAD-CAM ceramic materials with the highest survival rates. Methodology: A bibliographic search until November 2015 was performed using two databases: Medline (PubMed®) and Embase. Selected keywords and well-defined inclusion and exclusion criteria guided the search of relevant results. All articles were first reviewed by title, then by abstract, and subsequently by a full text reading. Data were assessed and extracted through a standardized form. The pooled results were statistically analyzed and the overall failure rate was calculated by random-effects model. Reported failures were analyzed by CAD-CAM system, type of restoration, restorative material, and luting agent. Results: From a total of 2628 single-tooth restorations with a mean exposure time of 7.3 years and 274 failures, the failure rate was 1.86% per year, estimated per 100 restoration years (95% CI: 1.08% to 3.19%). The estimated total survival rate after 5 years was 90.0% (95% CI: 88.8% to 91.2%). The KaVo ARCTICA system revealed a higher failure rate when compared with Cerec 2 system (p<0.001; 17.21% versus 1.95%); glass-ceramic restorations had a failure rate higher when compared with polycrystalline ceramics restorations (p<0.001; 1.18% versus 3.22%); full-coverage restorations (p<0.001; 1.99%) and endocrowns (p<0.001; 2.57%) showed a higher failure rate when compared with inlays/onlays (1.57%); chemically-cured lutings (p<0.001; 2.80%) had a higher failure rate when compared with dual-cured lutings while light-cured lutings had a lower failure rate. Conclusion: The overall survival rate of single-tooth restorations fabricated with CAD-CAM technology was similar to conventional ones.
Lattuf, Andreina Castro. "Microleakage of an intermediate restorative material in primary and permanent teeth a thesis submitted in partial fulfillment ... for the degree of Master of Science in Pediatric Dentistry ... /." 1998. http://catalog.hathitrust.org/api/volumes/oclc/68800173.html.
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