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1
Fletcher, Jane. "Regenerative Dental Enamel." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525455.
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Fong, Hanson Kwok. "Towards enamel biomimetics : structure, mechanical properties & biomineralization of dental enamel /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10606.
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Obeidi, Ali. "Enhancement of bonding to enamel and dentin prepared by Er,Cr:YSGG Laser." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2009r/obeidi.pdf.
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Hung, Cheung-sing Tony. "Bonding of dental alloys to enamel." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/HKUTO/record/B39558150.
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孔祥陞 and Cheung-sing Tony Hung. "Bonding of dental alloys to enamel." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B39558150.
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Williams, David Michael. "Psychological impact of dental enamel opacities." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/55569/.
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Conclusion: Implicit measures of attitude can be used to identify variation in the strength of attributions made about different dental conditions. Explicit measures may measure the valence of attitudes. This study suggests that mild fluorosis may be perceived more favourably than untreated dental caries. It has also shown that traditional approaches to assessing the perception of fluorosis may have exaggerated its impact.
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Lihong, He. "Mechanical behaviour of human enamel and the relationship to its structural and compositional characteristics." Connect to full text, 2008. http://hdl.handle.net/2123/3536.
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Thesis (Ph. D.)--University of Sydney, 2008.Title from title screen (viewed 9 October 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Biomaterials Science Research Unit, Faculty of Dentistry. Includes bibliographical references. Also available in print form.
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Walsh, Paula. "Acid permeation into dental enamel and hyroxyapatite." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317283.
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King, Nigel Martyn. "Prevalence and characteristics of developmental defects of dental enamel in Hong Kong." Thesis, Hong Kong : Dept. of Children's Dentistry & Orthodontics, University of Hong Kong, 1990. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12838007.
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鄭存革 and Cunge Zheng. "Relationship between dental caries in the primary teeth and developmental defects of enamel in the permanent successors." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B30331109.
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Peck, S. "Acoustic microscopy of caries in human dental enamel." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375312.
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Wong, Hai Ming. "Developmental defects of enamel." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36269815.
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Benson, Philip Edward. "Measurement of enamel demineralisation." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368002.
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Kirkham, J. "The mineralisation of dental enamel : An investigation into the role of developing enamel proteins." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354310.
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Gonçalves, Soraya Cheier Dib. "Influência de bebidas ingeridas rotineiramente por crianças na microdureza do esmalte de dentes decíduos: avaliação in vitro." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/58/58135/tde-13112007-112340/.
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O objetivo deste estudo foi avaliar, in vitro, a influência do refrigerante de limão (Sprite®), do suco à base de soja sabor maçã (Ades®) e do suco de morango (Kapo®), empregadas rotineiramente na alimentação de crianças na microdureza superficial e profunda do esmalte de dentes decíduos em função do tempo de exposição. Foram utilizadas quarenta coroas de incisivos decíduos humanos hígidos, acomodados em bases de acrílico mantendo as superfícies vestibulares expostas. Os conjuntos dente/base de acrílico foram impermeabilizados com esmalte cosmético, deixando exposta uma área de 3 mm de diâmetro na face vestibular, na qual foram realizadas as medidas de microdureza superficial Knoop (50 gf, 10 segundos e 5 endentações). Os espécimes foram divididos aleatoriamente em 4 grupos (n=10), de acordo com as bebidas empregadas (Sprite®, Ades®, Kapo®) e controle (mantidos em saliva artificial). Os ciclos de imersão foram realizados sob agitação, durante 5 minutos, 3 vezes ao dia, com intervalos de 4 horas durante 60 dias. As medidas de microdureza superficial foram realizadas após 7, 15, 30, 45 e 60 dias. Obtidas as medidas superficiais, os espécimes foram cortados no sentido longitudinal, lixados e polidos para a avaliação das medidas de microdureza a 30, 60, 90, 120, 150, 200 e 300?m de profundidade em relação à superfície exposta das bebidas. Os dados da microdureza superficial e profunda foram analisados estatisticamente pelos testes ANOVA e Tukey. Foi realizada a microscopia eletrônica de varredura em 20 coroas de incisivos decíduos humanos hígidos submetidos ao mesmo protocolo de imersão dos espécimes utilizados para a análise de microdureza. Nos resultados da porcentagem de variação de microdureza superficial (%VMS), observou-se que o Sprite® apresentou a maior variação de micro dureza superficial (62,02%), sendo estatisticamente diferente do Kapo®morango (49,05%) do Ades®maçã (40,56%) e da saliva (-11,31%). Houve perda progressiva da microdureza ao longo dos períodos estudados. Os resultados da microdureza em profundidade mostraram que houve diferença estatisticamente significante entre o refrigerante de limão (117,98 KHN), o suco de maçã à base de soja (188,18 KHN) e o suco de morango (157.27 KHN). Apenas na profundidade de 300 ?m é que ocorreu semelhança entre as quatro soluções estudadas. Concluiu-se que todas as bebidas avaliadas alteraram a microdureza do esmalte de dentes decíduos tanto superficialmente quanto em profundidade. A alteração em profundidade foi evidente até 200?m, sendo que o Sprite® alterou o esmalte de maneira mais intensa. Observou-se ainda que a alteração na microdureza do esmalte foi diretamente proporcional ao tempo de exposição a essas bebidas. As soluções deste estudo influenciaram negativamente a dureza do esmalte.The aim of this study was to assess, in vitro, the influence of a lemon soft drink (Sprite®), an apple soya juice (Ades®) and a strawberry juice (Kapo®) routinely utilized in children\'s diet on the superficial and deep microhardness of primary teeth enamel, as a function of the exposure time. Forty crowns of caries-free human primary incisors were included in acrylic bases, keeping the buccal surfaces exposed. The ensembles tooth/acrylic base were rendered waterproof by coating them with cosmetic nail varnish, leaving exposed a 3-mm area on the buccal surface, in which superficial Knoop microhardness measurements were performed (50 gf, 10 sec and 5 indentations). The specimens were randomly assigned to 4 groups (n=10), according to the beverages employed (Sprite®, Ades®, Kapo®) and the control group (kept in artificial saliva). The immersion cycles were performed under agitation for 5 minutes, 3 times a day, with 4 hours intervals, during a 60-day period. The superficial microhardness measurements were done after 7,15,30,45 and 60 days. Once the superficial measurements were performed, the specimens were longitudinally cut, ground and polished for the deep measurements to be accomplished. Microhardness measurements were done at 30, 60, 90, 120, 150, 200 e 300?m deep from the surface exposed to the beverages. Superficial and deep microhardness data were statistically analyzed using ANOVA and Tukey statistical tests. Scanning electron microscopy was performed in 20 crowns of caries-free human primary incisors submitted to the same imersion regimen as that of specimens utilized for microhardness testing. The results of superficial microhardness variation percentage (%VMS) showed that Sprite® (62, 02%) yielded the greatest microhardness, being statistically different from Kapo® (49, 05%); Ades® (40, 56%) and saliva (-11, 31%). There was a gradual and significant microhardness loss on superficial microhardness in all periods evaluated. The results of deep microhardness showed that there was statistically significant difference between the lemon soft drink (117, 98 KHN), apple soya juice (188, 18 KHN) and the strawberry juice (157.27 KHN). There was similarity between the beverages evaluated only at 300 ?m depth. It may be concluded that all beverages evaluated altered both the superficial and the deep microhardness of enamel of primary teeth. The alteration in deep microhardness was evident up to the 200?m depth. Sprite® affected the enamel more aggressively. It was also observed that the alteration on the enamel microhardness was directly proportional to the time of exposure to the beverages. The beverages of the reported study presented a negative impact on the enamel surface and depth of primary teeth.
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Shabanian-Borojeni, Mitra. "Wear studies of enamel and some restorative materials." Title page, contents and summary only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phs5241.pdf.
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Includes bibliographical references (leaves [1-20]). A systematic analysis of wear involving the in vitro analysis of the wear of standard composite resin and glass ionomer cements restorations under controlled conditions; and, the qualitative and quantitative investigation of wear over a range of pH's and loads which might be encountered clinically in order to develop a "wear map" of the micromorphology of wearing teeth and restorations and a systematic modeling of wear rates.
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湯翠明 and Sui-ming Lily Tong. "The clinical and microscopic effects of vital bleaching and enamel micro-abrasion on surface enamel." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B30433204.
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Tong, Sui-ming Lily. "The clinical and microscopic effects of vital bleaching and enamel micro-abrasion on surface enamel /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21129678.
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Creanor, Stephen Leonard. "Remineralisation of the incipient enamel lesion." Thesis, University of Glasgow, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305637.
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Ghiz, Matthew A. "Effects of sealant and self etching primer on enamel decalcification in vivo." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=46.
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Thesis (M.S.)--West Virginia University, 2004.Title from document title page. Document formatted into pages; contains viii, 113 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 66-81).
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Alharthy, Nutayla Said Amran. "In vitro investigation of dental erosion in enamel and dentine." Thesis, University of Glasgow, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479105.
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Wong, Hai Ming, and 王海明. "Developmental defects of enamel." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36269815.
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Choi, Yuen-ling Ruth. "The prevalence of enamel defects in Hong Kong Children in 1983 and 1991 a thesis submitted to the University of Hong Kong in partial fulfilment of the requirements for the degree of Master of Dental Surgery /." Click to view the E-thesis via HKUTO, 1993. http://sunzi.lib.hku.hk/HKUTO/record/B38628508.
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Riordan, Paul J. "Dental fluorosis diagnosis, epidemiology, risk factors and prevention /." Perth : Health Dept. of Western Australia, Dental Services, 1994. http://books.google.com/books?id=LO5pAAAAMAAJ.
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Itthagarun, Anut. "Effect of dentifrices on the fluoride uptake, de/ remineralization and morphology of sound enamel and initial enamel lesions /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2112971X.
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Itthagarun, Anut. "Effect of dentifrices on the fluoride uptake, de/ remineralization andmorphology of sound enamel and initial enamel lesions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31238622.
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Zhu, Jiajun, and 朱嘉珺. "Ultra-structural aspects of human enamel surface pretreatments." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208558.
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Conceição, Juliana Mendonça da [UNESP]. "Ação de géis fluoretados, suplementados ou não com hexametafosfato de sódio, no processo de erosão do esmalte dentário: estudo in situ." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/98358.
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000738501.pdf: 2167689 bytes, checksum: ca5a906678957479e48f0ebe5bdfe7ed (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Há evidência de que a suplementação de soluções de bochecho, dentifrícios e vernizes fluoretados com hexametafosfato de sódio (HMP) resulta em um menor desgaste do esmalte dental após um desafio erosivo. Uma vez que a associação entre flúor (F) e HMP ainda não foi testada em géis, o objetivo do presente estudo foi avaliar a ação de géis fluoretados, suplementados ou não com HMP, na erosão do esmalte dentário, associada ou não a abrasão in situ. Voluntários adultos jovens saudáveis (n=12) foram aleatoriamente divididos em 4 grupos, de acordo com os seguintes géis: Placebo (sem F ou HMP), NaF 1%, NaF 2% e NaF 1% + HMP 9%. Os voluntários fizeram uso de dispositivos palatinos contendo 4 discos de esmalte bovino, selecionados após polimento e análise de dureza de superfície. Os discos foram tratados uma única vez com os respectivos géis antes de cada período experimental, os quais tiveram duração de 5 dias, com intervalo de 7 dias entre cada período, seguindo um protocolo duplo-cego e cruzado. O desafio erosivo (ERO) foi realizado nos 4 discos de esmalte, por imersão ex vivo do dispositivo palatino em ácido cítrico pH 3,2 (4x/dia, 5 minutos cada). O desafio abrasivo foi produzido em apenas 2 blocos, imediatamente após os desafios erosivos (ERO+ABR), por meio de escovação com dentifrício fluoretado durante 30 segundos. O desgaste dos blocos foi analisado por perfilometria, enquanto que a perda mineral foi avaliada por meio de análise de dureza de superfície e em secção longitudinal. Os resultados foram analisados por ANOVA a 2 critérios e teste de Student-Newman-Keuls (p<0,05). O gel NaF 1% + HMP 9% promoveu desgaste significativamente menor para ERO em comparação aos demais grupos, sendo estatisticamente menor que os grupos NaF 1% e Placebo para ERO+ABR. Com relação à perda mineral, os menores valores de área integrada da lesão...
There is evidence that the addition of sodium hexametaphosphate (HMP) to fluoridated mouthwashes, toothpastes and varnishes promotes lower enamel wear after erosive challenges. Since the association of fluoride (F) and HMP has not been tested in gels, the aim of this study was to evaluate the effects of fluoride gels, supplemented or not with HMP, on the erosion of tooth enamel, followed or not by abrasion in situ. Twelve healthy young adult volunteers were randomly divided into 4 groups according to the following gels: Placebo (no F or HMP), 1% NaF, 2% NaF, and 1% NaF + 9% HMP. Volunteers wore palatal appliances containing 4 bovine enamel discs, which were selected after polishing and surface hardness analysis. The discs were treated only once with the respective gels prior to each experimental phase, which lasted for five days, with an interval of 7 days between each period. The erosive challenge (ERO) was performed on the 4 enamel discs by ex vivo immersion of the device in citric acid, pH 3.2 (4 times/day, 5 min each). The abrasive challenge was produced in only two blocks immediately after the erosive challenges (ERO+ABR) by brushing the discs for 30 seconds. Enamel wear was analyzed by profilometry, while the mineral loss was assessed by surface and cross-sectional hardness analysis. The results were analyzed by 2-way ANOVA, followed by Student-Newman-Keuls tests (p<0.05). The fluoridated gel supplemented with HMP promoted significantly lower enamel wear for ERO when compared to the other groups, and statistically lower than 1% NaF and Placebo for ERO+ABR. Regarding mineral loss, the lowest values of integrated area of the lesion were found for the 1% NaF + 9% HMP and 2% NaF, respectively for ERO and ERO+ABR. It was concluded that the addition of HMP to the 1% NaF gel led to a higher protective effect against ERO and ERO+ABR when compared to the gel with same F content without HMP. This effect was similar or superior to the 2% NaF gel.
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Bertoldo, Carlos Eduardo dos Santos 1986. "Evaluation of physicochemical properties of enamel after application of different bleaching products = Avaliação das propriedades físico-químicas do esmalte após diferentes tipos de clareamento." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289475.
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Orientador: José Roberto LovadinoTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A técnica de clareamento dental consiste em aplicar, sobre a superfície do esmalte, um gel que pode apresentar diferentes composições, mas que apresentam como princípio ativo o peróxido de hidrogênio. Há alguns anos, pesquisadores têm adicionado diferentes compostos químicos à composição visando diminuir os efeitos adversos causados pelo clareamento. Este estudo in vitro teve como objetivo avaliar as propriedades físico-químicas do esmalte dental após utilização de peróxido de hidrogênio com e sem cálcio e sequente aplicação do flúor neutro ou imersão em saliva artificial. Foram utilizados 40 blocos de esmalte e dentina (25mm2) obtidos de dentes incisivos bovinos que foram divididos em 4 grupos (n=10): G1- peróxido de hidrogênio (PH) a 35% com cálcio (Whiteness HP Blue/FGM) seguido da aplicação de flúor neutro a 2% por 2 minutos, G2 - PH a 35% com cálcio e armazenamento em saliva artificial por 7 dias, G3 - PH a 35% (Whiteness HP Maxx/FGM) seguido da aplicação de flúor neutro a 2% por 2 minutos, e G4 - PH a 35% e armazenamento em saliva artificial por 7 dias. Leituras de microdureza, rugosidade e composição química pela análise em EDS foram realizadas nos tempos: L1 - inicial, L2 - após a realização do clareamento e L3 após aplicação de flúor ou imersão em saliva artificial. Os dados obtidos foram submetidos a análise estatística pelo teste PROC MIXED de medidas repetidas, seguida pelo teste Tukey (?=5%). Em relação a análise física do esmalte, observou-se que os clareadores testados diminuíram a microdureza e aumentaram sua rugosidade superficial de maneira significante. Em L2, os grupos G1 e G2 apresentaram maiores valores de microdureza em relação a G3 e G4. L3 apresentou maior dureza em relação a L2 para todos os grupos testados. Os grupos com e sem flúor não diferiram estatisticamente entre si para dureza (p=0,6892) e rugosidade (p=0,3169). Em relação a análise química do substrato para o elemento Cálcio, em L1, não foram observadas diferenças estatísticas entre os grupos testados. Em L2, observou-se redução das taxas para os grupos G3 e G4. Em L3 não foram observadas diferenças estatísticas significantes entre os grupos. Para o elemento Fósforo, não houve diferença entre os grupos em L1 e em L2, entretanto em L3 observou-se aumento da taxa de maneira semelhante entre os grupos. Pode-se concluir que, para ambos os clareadores, a rugosidade superficial do esmalte aumentou e não se alterou após imersão em saliva ou flúor. Quanto à microdureza, sua redução foi menor para o clareador com cálcio. A aplicação de flúor neutro ou imersão em saliva artificial, após o clareamento, foi eficaz na recuperação dos valores de dureza iniciais, mas foi ineficaz em relação a rugosidade. Conclui-se ainda que o agente clareador com cálcio afetou de forma significante a concentração de Cálcio do esmalte em comparação ao grupo tratado com agente comum.
Abstract: The bleaching technique consists in applying a gel on enamel surface. The gel can have different compositions, but it's active ingredient is hydrogen peroxide. A few years ago, researchers have been adding different chemicals components to the composition in order to decrease the adverse effects caused by bleaching. This in vitro study aimed to evaluate the enamels physicochemical properties after using hydrogen peroxide with and without calcium and consequent application of neutral fluoride or immersion in artificial saliva. Forty enamel and dentin blocks (25mm2) obtained from bovine incisors were divided into 4 groups (n = 10): G1 - hydrogen peroxide (HP) 35 % Calcium ( Whiteness HP Blue / FGM ) followed by application of neutral 2% fluorine (2 minutes), G2 - PH 35% calcium and storage in artificial saliva (7 days) , G3 - PH 35 % ( Whiteness HP Maxx / FGM) followed by application of neutral 2% fluorine (2 minutes) and G4 - PH 35% and storage in artificial saliva (7 days). Microhardness, roughness and chemical composition analysis by EDS readings were performed on: L1 - initial; L2 - after bleaching; and L3 - after fluoride application or immersion in artificial saliva. Data were statistically analyzed by PROC MIXED with repeated measures test followed by Tukey test (? = 5%). Regarding physical analysis, it was observed that bleaching decreased hardness and increased surface roughness from all groups. In L2 , G1 and G2 presented higher hardness values compared to G3 and G4 . L3 was presented better results in relation to L2 for all groups. Groups treated with fluorine or artificial saliva didn't differ statistically for hardness (p = 0.6892) and roughness (p = 0.3169). Regarding the chemical analysis, for Calcium element in L1 , there were no statistical differences between the groups tested. In L2 , there were a reduction in rates for groups G3 and G4. In L3 there were no statistically significant differences between groups. For the Phosphorus element, there were no difference between groups in L1 and L2, but in L3 there were an increase in rate similarly between groups. It can be concluded that for both bleaching agents, the enamel's surface roughness increased and did not change after immersion in saliva or fluoride application. About microhardness, the values reduction was smaller for bleaching with calcium. The neutral fluoride application or immersion in artificial saliva after bleaching was effective in recovery of baseline values, but was ineffective against the roughness. Bleaching agent with calcium significantly affect the concentration of enamel's calcium compared to group treated with common agent.
Doutorado
Dentística
Doutor em Clínica Odontológica
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Santos, Luciana Floriani Thives Freitas [UNESP]. "Efeito da escovação utilizando dentifrícios com diferentes graus de abrasividade no desgaste do esmalte após o uso de agentes clareadores com e sem cálcio, em diferentes intervalos de tempo." Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/123707.
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000828037.pdf: 381697 bytes, checksum: eac0b0271a911a66df24071eb1f73ae3 (MD5)O objetivo deste estudo foi avaliar os efeitos da escovação, utilizando dentifrícios com diferentes graus de abrasividade após a exposição ao agente clareador peróxido de hidrogênio (PH) 7,5% com ou sem a adição de gluconato de cálcio em diferentes intervalos de tempo (imediatamente e após 1 h). Foi analisada a alteração no tecido dental decorrente destas interações no desgaste de superfície do esmalte. Neste estudo foram utilizados 144 espécimes de esmalte bovino, os quais foram distribuídos em 12 grupos (n = 12) de acordo com o gel clareador utilizado (com e sem cálcio), o grau de abrasividade (alto ou baixo) e o intervalo de tempo decorrido após a utilização do gel clareador (imediatamente e após 1 h). Para o controle, 4 grupos não foram expostos ao gel clareador, apenas passaram pelos ciclos de abrasão, de acordo com o tipo de abrasivo e o intervalo de tempo. O gel clareador foi aplicado por 1 h e após este período, os grupos que foram escovados imediatamente, passaram para o ciclo de abrasão e os do intervalo de 1 h permaneceram na saliva artificial antes da realização dos ciclos abrasivos. Os espécimes foram submetidos a 45 ciclos de escovação, correspondentes a 3x ao dia (135 ciclos por dia - 1 min e 30 s). Estes procedimentos foram repetidos por 7 dias, totalizando 945 ciclos ao final do estudo. O desgaste da superfície do esmalte foi medido (μm) por perfilometria. Para verificação dos resultados foi aplicado o teste ANOVA três fatores e o teste de Tukey. O nível de significância foi de 5%. Foram observadas diferenças estatisticamente significantes (p=0,0001) para os três fatores testados. Os valores de média (± DP) e os resultados do teste de Tukey para o fator clareamento foram: SC- 0,45(± 0,01)a, PH+Ca- 0,51(± 0,03)b, PH- 0,82(± 0,01)c. Para o fator abrasivo, foram: Baixo- 0,44(± 0,01)a e Alto- 0,74(± 0,05)b e para o intervalo de tem...
The objective of this study was to evaluate the effects of brushing, using toothpastes with different degrees of abrasiveness after exposure to bleaching agent hydrogen peroxide (HP) 7.5% with or without the addition of calcium gluconate in different time intervals (immediately and after 1 h). The alteration in dental tissue resulting from these interactions on enamel surface wear was analyzed. In this study 144 bovine enamel specimens were divided into 12 groups (n = 12) according to the whitening gel used (with and without calcium), the grade of abrasive (high or low) and the time interval elapsed after use of the bleaching gel (immediately and after 1h). For the control, four groups were not exposed to the bleaching gel and were just submitted to abrasion cycles according to the type of abrasive and the time interval. The bleaching gel was applied for 1 h and after this period, the groups that were brushed immediately were submitted to abrasion cycle, and the ones tested after 1h, remained in artificial saliva before the performance of abrasive cycles. The specimens were subjected to 45 cycles of brushing, corresponding to 3x a day (135 cycles per day - 1 min 30 s). These procedures were repeated for 7 days, totaling 945 cycles at the end of the study. The enamel wear was measured (μm) by profilometry. To check the results, three-way ANOVA and Tukey's test was applied. The significance level was 5%. Statistically significant differences (p =0.0001) for the three tested factors were observed. Mean values (± SD) and results of Tukey test for whitening factor were: NB- 0.45(± 0.01)a, HP+Ca- 0.51(± 0.03)b, HP - 0.82(± 0.01)c. For the abrasive factor were: Low- 0.44(± 0.01)a and High- 0.74(± 0.05)b and for the time interval, were: 1h- 0.41(± 0.01)a, immediately- 0.77(± 0.05) b. It can be concluded that: a) HP 7.5% bleaching increased the enamel susceptibility to abrasion, b) the...
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Song, Rhan-Ju. "Developmental defects of enamel in the Maya of Altun Ha, Belize implications for Ancient Maya childhood health." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21702.pdf.
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Hodnett, Spencer. "The protective potential of paste containing casein phosphopeptide-amorphous calcium phosphate as measured by confocal microscopy an in vitro study /." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5051.
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Thesis (M.S.)--West Virginia University, 2007.Title from document title page. Document formatted into pages; contains ix, 113 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 69-79).
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Kantorowitz, Zvi. "The feasibility of bonding orthodontic brackets to laser treated enamel surfaces." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0012/MQ32148.pdf.
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Kendzior, Bradley F. "A comparison of the effects of different wavelengths of argon laser irradiation on the solubility of human enamel an in vitro study /." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1918.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains viii, 97 p. : ill. Includes abstract. Includes bibliographical references (p. 75-83).
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Al-Hiyasat, Ahmad Saleh. "An investigation of the wear of human enamel and dental ceramics." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360928.
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蔡苑玲 and Yuen-ling Ruth Choi. "The prevalence of enamel defects in Hong Kong Children in 1983 and 1991: a thesis submitted to the University ofHong Kong in partial fulfilment of the requirements for the degree ofMaster of Dental Surgery." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B38628508.
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Adebayo, Olabisi. "The influence of surface characteristics on adhesion to enamel and dentine." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/6618.
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This body of research investigated the bonding efficiency of self-etching primer adhesives to enamel and dentine with various surface characteristics. A series of preliminary experiments was carried out to determine the effect of operator experience, dentine tubule orientation, bond strength test method and resin composite material used on bond strengths. The results of the preliminary tests concluded that it is essential to develop skills in material handling and the test methods used; 2-step self-etching primer adhesives exhibit higher but more variable microshear bond strengths (µSBS) than ‘all-in-one’ adhesives on dentine at different depths and tubule orientations; fracture toughness and bond strength test results suggest that the fracture toughness of a resin composite may not be of significant influence on microtensile and µSBS tests outcomes for nano-filled hybrid materials.An investigation of the bonding ability of self-etching primer adhesives under various tooth preparation conditions was carried out. Enamel and dentine specimens were prepared from human teeth and finished with various rotary cutting instruments and the erbium, chromium:yttrium, scandium, gallium, garnet laser. Specimens were bonded with two 2-step self-etching primer adhesives and two ‘all-in-one’ adhesives with a resin composite. The results showed that one of the 2-step adhesives exhibited higher but more variable µSBS than the ‘all-in-one’ adhesives and a silorane-based self-etching primer adhesive system to enamel and dentine.
The relationship between enamel microhardness and µSBS was evaluated. Enamel specimens were prepared and finished with one half of the surface tested for hardness using the Vickers test. The other half of the enamel surface was bonded using either a 2-step self-etching primer adhesive or an ‘all-in-one’ adhesive and a hybrid resin composite. Mean Vickers hardness numbers and µSBS for each enamel surface were calculated. Analysis using Pearson’s parametric test for regression analysis evaluated the correlation between Vickers hardness and µSBS. The results revealed a weak negative insignificant correlation between VHN and µSBS for the 2-step adhesive and no correlation for the ‘all-in-one’ adhesive.
The effect of conditioning and casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) on bonding to bleached and unbleached enamel was investigated. Four groups of enamel specimens: untreated control; bleaching with 16% carbamide peroxide gel for 90 min daily x 14 days; treated with CPP-ACP paste (Tooth Mousse, GC Corp., Japan) for 60 min daily x 7 days and bleached and CPP-ACP-treated were used. The specimens were divided into a further two groups and bonded with a total-etch adhesive or a 2-step self-etching primer adhesive. Specimens bonded with the self-etching primer adhesive were sub-divided into four conditioning subgroups before bonding: no conditioning; 30 – 40% phosphoric; 15% EDTA; 20% polyacrylic acid. Specimens were tested in shear mode until failure and analysed by 2-way ANOVA, one-way ANOVA and Tukey’s post-hoc test. The µSBS of the total-etch adhesive was not affected by enamel treatment. Bleaching reduced the µSBS of the self-etching primer adhesive but preconditioning with phosphoric acid and polyacrylic acid improved bond strengths after CPP-ACP application. Bond failure analysis revealed a predominance of adhesive failures after bleaching, but prior conditioning reduced the proportion of adhesive failures. Scanning electron microscopy (SEM) revealed that the interfacial morphology produced by the 2-step self-etching primer adhesive was independent of enamel treatment except after bleaching. Phosphoric acid etching was not inhibited by CPP-ACP treatment. Resin tag formation was observed with prior phosphoric acid and polyacrylic acid conditioning.
The effect of conditioning and CPP-ACP application on dentine bonding was also investigated. Dentine specimens with and without the smear layer were prepared and divided into a further two groups, CPP-ACP paste applied to one group for 60 min daily x 7 days and the other group was untreated. The two groups were divided into three subgroups for conditioning: no conditioning; 30 - 40% phosphoric acid; 20% polyacrylic acid. The dentine was bonded using a 2-step self-etching primer adhesive and an ‘all-in-one’ adhesive, and tested as previously described. Statistical analysis was carried out using one-way ANOVA and Tukey’s post-hoc test at α = 0.05. The results showed that the µSBS of both adhesives were not significantly affected on smear-covered dentine but was affected on smearless dentine. Conditioning did not improve bond strengths. Bond failure analysis showed more adhesive failures for the ‘all-in-one’ adhesive, particularly on smearless dentine and with prior polyacrylic acid conditioning. SEM revealed a similar morphology of the bonded interface for the 2-step self-etching primer adhesive regardless of conditioning; and areas of bond failures for the ‘all-in-one’ adhesive.
The 2-step self-etching primer adhesives exhibited higher bond strength and more regular bond integrity than the ‘all-in-one’ adhesives, as shown on the SEM observations. However, the ‘all-in-one’ adhesives exhibited less variability in bond strengths to tooth surface characteristics.
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Berger, Sandrine Bittencourt. "Efeitos de agentes clareadores de alta concentração para tratamento em consultorio na microdureza, morfologia e composição quimica do esmalte humano." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287820.
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Orientador: Marcelo GianniniDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Vários estudos têm se preocupado com os efeitos adversos produzidos pelos agentes clareadores de uso caseiro e de consultório. Este estudo tem como objetivo avaliar os efeitos de agentes clareadores de alta concentração (peróxido de hidrogênio a 35%) utilizados em consultório na dureza, composição química e estrutural do esmalte humano. Sessenta e cinco terceiros molares humanos hígidos foram utilizados. Dois fragmentos de esmalte (4x4x3mm) foram removidos das faces vestibular e lingual de cada dente. As amostras foram divididas em 10 grupos (n=10). Antes do clareamento, foram polidas e submetidas ao teste de microdureza Knoop (KHN) e análise em Espectroscopia Raman Transformada de Fourier (ERTF) para determinação da relação de fosfato (PO4) e carbonato (CO3) presente no esmalte não tratado. O grupo controle (GC) não foi submetido ao tratamento clareador. Nos grupos experimentais foram utilizados três diferentes agentes clareadores (Whiteness HP Maxx - W; Pola Office ¿ P e Opalescence Xtra - O) bem como três formas de irradiação (sem irradiação - SI; irradiação com lâmpada halógena ¿ LH, irradiação com LED + Laser Diodo - L). Após os tratamentos, os géis clareadores foram coletados com a solução de enxágüe para avaliação da concentração de cálcio, utilizando espectrofometria de absorção atômica. Em seguida, as amostras foram submetidas à ERTF, ao teste de microdureza superficial e interna, observadas em microscopia eletrônica de varredura para analisar as alterações na superfície e avaliadas em microscopia de luz polarizada para analisar os efeitos das técnicas de clareamento na desmineralização superficial do esmalte. As médias de microdureza superficial variaram de 297,48±16,29 (O-SI) a 317,86±9,62 (P-L) antes do tratamento clareador e 260,94±17,17 (OSI) a 291,68±16,20 (W-LH, pós-clareamento). Para a microdureza interna as médias variaram de 69,55±42,02 (O-L, 20ìm) a 288,13±53,16 (GC, 80ìm). Na determinação da composição química do esmalte através de ERTF, para o fosfato a média da área do pico de fosfato variou entre 14,50± 0,32 (O-SI) a 14,90 ± 0,28 (P-LH) antes do tratamento, sendo que após o tratamento variaram entre 14,24 ± 0,72 (P-L) a 15,03 ± 0,23 (P-LH). Para o carbonato valores de: 3,60 ± 0,52 (W-LH) a 4,41 ± 0,67 (P-SI) antes do tratamento foram encontrados. Após o tratamento variaram entre: 3,69 ± 0,29 (GC) a 4,41 ± 0,13 (P-LH). A concentração de cálcio presente na solução de enxágüe variou entre 0,32 (W-SI) a 1,61 (O-L). Na microscopia eletrônica de varredura, com exceção do grupo controle, todos os grupos apresentaram alterações morfológicas na superfície. Em microscopia de luz polarizada, os grupos Whiteness sem irradiação, com luz halógena e LED/laser, Pola Office com LED/laser e Opalescence com luz halógena e LED/laser apresentaram desmineralização em profundidade. Observamos alterações no conteúdo mineral pela diminuição significativa dos valores de microdureza, perda de cálcio e desmineralização visualizada em microscopia de luz polarizada, além de alterações morfológicas na superfície do esmalte visualizadas em microscopia eletrônica de varredura. Concluímos que a utilização do peróxido de hidrogênio a 35% empregado no tratamento clareador em consultório requer cautela uma vez que, causa alterações na estrutura do esmalte como mostrado no presente estudo
Abstract: Several studies have been concerned with the adverse effects produced by home applied and in-office bleaching treatments. The aim of this study is to evaluate the effects of highconcentrated bleaching agents (35% hydrogen peroxide) on human enamel microhardness, chemical and structural composition. Sixty and five human third molars human were used. Two enamel blocks (4x4x3mm) were obtained from bucal and lingual surfaces of each tooth. The samples were divided in 10 groups (n=10). Before the bleaching treatment, samples were polished and submitted to microhardness test (Knoop) and Fourier Transform Raman Spectroscopy (FTRS) analysis in order to determine the concentration of phosphate (PO4) and carbonate (CO3) present the enamel. Control group (CG) was not submitted to the bleaching treatment. In the remaining experimental groups three different bleaching agents were used (Whiteness HP Maxx - W; Pola Office ¿ P and Opalescence Xtra - O) and three ways of irradiation (no light irradiation - N; irradiation with halogen light - HL and irradiation with LED + Diode Laser - L). After the treatments, the rinsing water solution was to evaluate the concentration of calcium, by means of atomic absorption spectrometry analysis. Afterwards, the samples were re-submitted to FTRS and to surface and cross-sectional microhardness measurement. Samples were observed in scanning electron microscopy to observe surface alterations and in polarized light microscopy to examine the effects of the bleaching techniques in the demineralization of the enamel. The average surface microhardness values microhardness ranged from 297.48±16.29 (O-N) to 317.86±9.62 (P-L) before the bleaching treatment and 260.94±17.17 (O-N) to 291.68±16.20 (W-HL) after bleaching. The mean values obtained after cross-sectional microhardness measurement ranged from 69.55±42.02 (O-L, 20µm) to 288.13±53.16 (CG, 80 µm). The phosphate concentration on enamel determined by means of FTRS ranged from 14.50±0.32 (O-N) to 14.90±0.28 (P-HL) before the treatment. After the treatment the phosphate concentration ranged from 14.24±0.72 (P-L) to 15.03±0.23 (P-HL). The concentration of carbonate present on treated enamel ranged from 3.60±0.52 (WHL) to 4.41±0.67 (P-N) before the treatment and after the treatment, the concentration varied from 3.69±0.29 (CG) to 4.41±0.13 (P-LH). The concentration of calcium in the rinsing water solution ranged from 0.32 (W-N) to 1.61 (O-L). The scanning electron microscopy showed that all groups presented morphologic alterations in the surface, except for the control group. The images obtained after polarized light microscopy showed that Whiteness without irradiation, with halogen light and LED/diode laser, Pola Office with LED/diode laser and Opalescence with halogen light and LED/diode laser presented demineralization. Alterations on enamel mineral content, significant decrease of enamel microhardness and calcium concentration, demineralization observed by means of polarized light microscopy and morphological alterations on enamel observed by means of scanning electron microscopy were observed in the present study. In conclusion, the use of the 35% hydrogen peroxide as a bleaching agent in clinical situations requires caution, since it may cause alterations on enamel structure as observed in the present study
Mestrado
Mestre em Materiais Dentários
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Scatena, Camila. "Efeito erosivo de medicamentos pediátricos de uso prolongado no esmalte de dentes decíduos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/58/58135/tde-08062011-161811/.
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O objetivo deste estudo foi avaliar o efeito in vitro de três medicamentos líquidos orais pediátricos de uso prolongado no esmalte de dentes decíduos. Sessenta incisivos superiores decíduos hígidos, recentemente esfoliados, foram seccionados de forma a expor a superfície vestibular e foram fixados em bases acrílicas. As superfícies foram polidas e os conjuntos dente/base acrílica foram impermeabilizados com duas camadas de esmalte cosmético para unhas, deixando exposta uma área de 2 mm² na superfície vestibular, na qual as medidas de Microdureza Superficial Knoop foram realizadas (25 gf, 30 s e 3 penetrações). Os espécimes foram divididos aleatoriamente em 4 grupos (n=15) de acordo com os medicamentos empregados (Guaifenesina- Xarope Vick®-Mel; Sulfato Ferroso- Sulferrol®; Sulfato de Salbutamol) e o grupo controle (Saliva Artificial). Os ciclos de imersão foram realizados durante um período de 28 dias, sob leve agitação por 1 min, 3 vezes ao dia, com 6 horas de intervalo, quando espécimes eram mantidos em saliva artificial. As medidas de microdureza superficial foram realizadas após 7, 14, 21 e 28 dias e os dados obtidos foram estatisticamente analisados. A Microscopia Eletrônica de Varredura foi realizada em 20 espécimes, após o período de 28 dias de exposição em cada solução. A ANOVA, seguida pela decomposição da soma dos quadrados e o teste de Tukey mostraram diferenças estatisticamente significantes na microdureza superficial entre os 3 medicamentos: Sulfato Ferroso (236,7 KHN); Sulfato de Salbutamol (118,5 KHN); Guaifenesina (231,6 KNH); quando comparados ao grupo controle (305,7 KNH). Não houve diferença significante entre os grupos de Sulfato Ferroso e Guaifenesina. Todos os medicamentos avaliados reduziram os valores de microdureza do esmalte e o menor valor de microdureza foi encontrado no grupo do Sulfato de Salbutamol. Concluiu-se que todos os medicamentos relatados no estudo apresentaram efeito erosivo à superfície do esmalte de dentes decíduos.The aim of this study was evaluate in vitro the erosive effect of 3 pediatric long-term relief syrups on enamel of primary teeth. Sixty sound exfoliated deciduous superior incisors were sectioned in order to expose the buccal surface and fixed in acrylic bases. The surfaces were flat and ground and the ensembles thooth/acrylic base were rendered waterproof by coating them with cosmetic nail varnish, leaving exposed a 2-mm² area on the buccal surface, in which superficial Knoop microhardness measurements were performed (25 gf, 30 sec and 3 indentations). The specimens were randomly assigned to 4 groups (n=15) according to the medications employed (Guaifenesin - Vick®-Mel Syrup; Ferrous Sulfate - Sulferrol®-; Salbutamol Sulfate) and the control group (Artificial Saliva). The immersion cycles were performed during a 28-day period, under low agitation for 1 min, 3 times a day, with 6 hours interval, when specimens were kept in artificial saliva. The superficial microhardness measurements were performed after 7, 14, 21 and 28 days and the data were statistically analyzed. Scanning electron microscopy was performed after the 28-day of exposition in each solution. The two-way ANOVA, followed by sum of squares decomposition and Tukeys test showed significant differences in superficial microhardness between the 3 medicaments: Ferrous Sulfate (236.7 KHN); Salbutamol Sulfate (118.5 KHN); Guaifenesin (231.6 KNH); compared with control group (305.7 KNH). There was no significant difference between the groups of Ferrous Sulfate and Guaifenesin. All the syrups evaluated reduced the final enamel microhardness and the lowest microhardness value was Salbutamol Sulfate. It may be concluded that the syrups of the reported study presented erosive effect on the enamel surface of primary teeth.
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Schouten, John Robert. "The effect of argon laser irradiation on etched and pumiced human enamel an in vitro study /." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=542.
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Thesis (M.S.)--West Virginia University, 1999.Title from document title page. Document formatted into pages; contains ix, 123 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 71-82).
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PEREIRA, THIAGO M. "Determinacao da difusividade termica do esmalte e dentina em funcao da temperatura, utilizando termografia no infravermelho." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9449.
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Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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吳婉慧 and Yuen-wai Ng. "Effects of calcium phosphate lozenges on enamel lesions: an in vitro study." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B45007767.
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Malinowski, Marina. "In situ studies with fluoridated milk for the remineralisation of dental enamel." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540571.
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Chatfield, Stuart R. "A study of pore structure of human dental enamel using radiotracer techniques." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389134.
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Miles, E. M. "Post-eruptive maturation of dental enamel : development of an in vitro model." Thesis, University of Liverpool, 2016. http://livrepository.liverpool.ac.uk/3006415/.
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Dental caries is a highly prevalent chronic disease, the treatment of which, forms a significant financial burden. Furthermore, due to the invasive nature and relatively high long-term failure rate of established treatments, focus has been placed on effective prevention strategies in order to instead circumvent the problem before it occurs. Prevalence of dental caries is particularly high in adolescents due to the increased susceptibility of newly erupted teeth to acid dissolution. A transient vulnerability that is gradually lost with time through a post-eruptive maturation process. Post-eruptive maturation (PEM) refers to chemical and physical changes that occur in the outer enamel layers following exposure of newly erupted teeth to the oral environment. Whilst little is known about the underlying mechanism, it is believed to be a result of the natural fluctuation between de- and remineralising states within the oral cavity. To date, most literature regarding PEM places focus on measuring the outcomes of the process (Which include increased surface hardness, decreased porosity and a decrease in susceptibility to acid dissolution) as opposed to investigating the reasoning behind such changes. One reason for this focus is the difficulties faced when initially approaching the study of PEM, as there is currently no established model or protocol for recreating the process in vitro. In order to address this problem, the current work outlines the development process of a proposed pH-cycling model for use in the study of PEM. The efficacy of the model was initially assessed though its ability to reduce acid dissolution and then also through its effect on surface microhardness. The often speculated role of repeated sub-clinical caries events as the basis to PEM was confirmed through the observation of significantly reduced mineral loss in enamel previously exposed to plaque-fluid-relevant pH-cycling conditions. Further to this, the ability of Fluoride, Zinc and Strontium to supplement this effect was demonstrated, in addition their ability to replicate the increased surface microhardness observed during PEM. The 20-day, plaque-fluid-relevant, pH-cycling model proposed within this work has the potential to allow much greater insight into the underlying chemical mechanisms underpinning PEM, particularly the potential incorporation of ions such as F and Zn, in addition to allowing the testing and identification of agents to enhance the observed effects. As such, this work provides a much-needed springboard from which the clinical potential of PEM can be unlocked.
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Anderson, Anissa Monseau. "The effectiveness of argon laser irradiation of pumiced and etched enamel on decalcification during orthodontic treatment an in vivo study /." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1869.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains viii, 118 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 65-73).
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Clement, John Gerald. "The development, structure and chemistry of elasmobranch skeletal tissues." Thesis, Queen Mary, University of London, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250089.
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Hassanali, Linda. "Quantitative measurements of the demineralisation rates and mineral masses of deciduous and permanent enamel." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/42506.
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Human deciduous and permanent enamel samples were simultaneously exposed to 0.1 M acetic acid pH 4.0 solution with an increasing calcium and phosphate concentration. Demineralisation rates at each calcium and phosphate increment were measured by scanning microradiography (SMR) to monitor in real-time the demineralisation trend. No significant differences (p > 0.05) were observed between baseline demineralisation rates of each enamel type. Similarities in the demineralisation trend as a function of increasing calcium and phosphate concentration were also observed. SMR detected a halt in demineralisation rate at 30 mM and 32.5 mM calcium concentration for permanent and deciduous enamel equilibrium between the solution and enamel samples had been achieved. Comparisons of the SMR data with a speciation software program indicated the solubility product of deciduous and permanent enamel is 121 in pH 4.0 and 25 ⁰C conditions. X-ray Microtomography (XMT) results of the mineral concentrations of each enamel type showed no significant differences (p > 0.05) and Confocal laser scanning microscopy (CLSM) image analysis of rhodamine B dye infiltration showed no significant differences between the interprismatic regions of each enamel type (p >0.05), complementing the SMR data. Permanent enamel exhibited significantly larger prism head diameters near to the surface of enamel compared to near the EDJ, whereas prism head diameters in deciduous enamel remained relatively constant throughout enamel. Thus the high caries incidence rates amongst children may be due to a lower level of protection offered by saliva and the oral environment of a child compared to an adult rather than the structure and the physical chemistry of the tissue itself.
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Andrade, Alessandra Pereira de. "Monitoramento do processo de desmineralização e remineralização do esmalte dental humano durante e após o clareamento dental." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/23/23134/tde-24102009-110644/.
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Este estudo in situ tem como proposta geral monitorar os processos de desmineralização e remineralização do esmalte dental humano durante e após o clareamento dental e como objetivos específicos: avaliar se o processo de desmineralização e remineralização do esmalte dental é influenciado pela utilização de agentes clareadores com diferentes composições e estimar o período necessário para que o esmalte dental clareado atinja os níveis de mineralização evidenciados anteriormente ao início do tratamento clareador. Dez voluntários participaram deste estudo utilizando dispositivos intra-orais contendo quatro fragmentos de esmalte dental humano cada que foram submetidos aos seguintes tratamentos: G1 - peróxido de hidrogênio 35% (Pola Office, SDI); G2 - peróxido de hidrogênio 7,5% (Pola Day, SDI); G3 - peróxido de hidrogênio 7,5% (Day White ACP, Discus Dental); G4 - ácido fosfórico 35% (Condicionador de ácido fosfórico 3M ESPE Scotchbond 3M ESPE). O período do estudo compreendeu 21 dias entre tratamento e monitoramento que foi realizado pelo método de fluorescência do tecido dental com o auxílio do equipamento QLF System. A análise estatística realizada pelo teste estatístico de ANOVA 2 fatores para mensurações repetidas e o teste de Tukey revelou haver diferenças estatísticas entre os tratamentos realizados e entre os tempos de mensuração. Após a realização do monitoramento do conteúdo mineral do esmalte dental durante e posteriormente ao término do tratamento clareador pode-se constatar que os agentes clareadores que apresentam composições químicas distintas ocasionaram diferentes níveis de desmineralização no esmalte dental humano, sendo que o composto ACP presente em um dos géis clareadores utilizados foi capaz de reduzir o processo de desmineralização durante o período de tratamento clareador. O período necessário para que o esmalte dental clareado atingisse os níveis de mineralização iniciais variaram em função do clareador utilizado, porém apenas o agente clareador que contém o composto ACP foi capaz de remineralizar completamente após 21 dias.The overall proposal of this in situ study is to monitor the demineralization and remineralization process of human enamel during and after dental bleaching and its specific objectives are: to assess whether the process of demineralization and remineralization of enamel is influenced by the use of bleaching agents with different composition and estimate the time required to bleached enamel reaches the levels of mineralization observed prior to bleaching treatment. Ten volunteers participated of this study wearing intraoral devices containing four fragments of human enamel submitted to the following treatments: G1 - 35% hydrogen peroxide (Pola Office, SDI), G2 - 7.5% hydrogen peroxide (Pola Day, SDI); G3 - 7.5% hydrogen peroxide (Day White ACP, Discus Dental); G4 - 35% phosphoric acid (Scotchbond 3M ESPE, 3M ESPE). The study period comprised 21 days of treatment and monitoring. Monitoring was conducted by the quantitative light fluorescence method, with QLF System. Statistical analysis performed by the statistical two-way ANOVA for repeated measurements and Tukey tests demonstrated differences between treatments and between measurement times. Monitoring the enamel mineral content during and after the end of the bleaching treatment revealed that the bleaching agents with different chemical compositions resulted in different levels of human enamel demineralization and that, the ACP compound present in one of the bleaching agents used was able to reduce the demineralization process during the bleaching treatment. Time required for the bleaching human enamel reaches the initial levels of mineralization varied depending on the bleaching agent used, but only the bleaching agent containing ACP was able to completely remineralize enamel after 21 days.
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Verma, Shefalee. "Effects of fluoridated milk on artificial enamel carious lesions." Thesis, Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B41758201.
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