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Alyassin, Waleed. "The influence of heat production relative to drill wear during osteotomy preparation by different implant drill systems a comparison study between ceramic and conventional implant drill systems /." Morgantown, W. Va. : [West Virginia University Libraries], 2010. http://hdl.handle.net/10450/11068.
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Thesis (M.S.)--West Virginia University, 2010.Title from document title page. Document formatted into pages; contains vi, 41 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 37-41).
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Pihlaja, J. (Juha). "Treatment outcome of zirconia single crowns and fixed dental prostheses." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212029.
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Abstract Metal ceramic restorations have been used in fixed prosthodontics since the 1950s, but the lack of aesthetics, the inclination to use metal-free materials, possible allergic reactions to metals, and the high cost of high noble alloys have increased the use of all-ceramic materials. The ongoing development of ceramic materials led to the introduction of zirconia to fixed prosthodontics over a decade ago. The mechanical properties of zirconia have proven to be excellent, but the clinical outcome of conventional fixed zirconia restorations over the long term is unclear. This retrospective clinical study evaluated two- to seven-year outcomes, early complications during prosthetic treatment and short-term failures during the first year of use of zirconia single crowns and fixed dental prostheses (FDPs). The usefulness and durability of zirconia single crowns in abutment teeth of partial removable dental prostheses (RDPs) was also evaluated. The material consisted of 173 patients treated with zirconia single crowns or FDPs by undergraduate dental students between 2007 and 2010. Of these patients 94 were women and 79 men (mean age 55 years, range 18–79 years). Altogether 268 zirconia single crowns (mean 3 crowns, range 1–12 crowns per patient) had been fabricated for 88 patients and 120 zirconia FDPs (range 3–12 units, mean 4.5 units) for 102 patients. Seventeen patients had received both crown(s) and FDP(s). The results show that zirconia single crowns and FDPs are a suitable treatment alternative in fixed prosthodontics. Early complications during prosthetic treatment and short-term failures during the first year of use were few. The survival rate of the zirconia single crowns after 3.9 years (2–6 years) was 89% and the success rate was 80%. The survival rate of zirconia FDPs after 4.9 years (3–7 years) was 100% and the success rate was 89%. Zirconia single crowns perform well as abutment teeth of partial RDPs with a metal framework, but fractures in the veneering porcelain remain a problemTiivistelmä Metallokeraamisia rakenteita on käytetty kiinteässä protetiikassa 1950-luvulta lähtien, mutta puutteet estetiikassa, pyrkimys metallittomiin materiaaleihin, mahdolliset allergiset reaktiot ja jalojen metallien korkea hinta ovat lisänneet kokokeraamisten materiaalien käyttöä. Kokokeraamisten materiaalien kehitystyö on tuonut zirkonian kiinteän protetiikan materiaaliksi. Zirkonian mekaaniset ominaisuudet ovat osoittautuneet erinomaisiksi, mutta hammaskantoisten kiinteiden zirkonia-runkoisten proteesien kliiniset pitkäaikaistulokset puuttuvat. Tämän retrospektiivisen kliinisen tutkimuksen tarkoituksena oli selvittää zirkonia-runkoisten yksittäisten kruunujen ja zirkonia-runkoisten siltojen menestymistä 2–7 vuoden aikavälillä sekä kartoittaa niiden valmistuksen aikaiset ongelmat ja varhaiset epäonnistumiset ensimmäisen vuoden aikana. Lisäksi tutkittiin zirkonia-runkoisten yksittäisten kruunujen käyttökelpoisuutta ja kestävyyttä metallirunkoisten rankaproteesien tukihampaina. Materiaali koostui 173 potilaasta, joille hammaslääketieteen opiskelijat olivat tehneet zirkonia-runkoisia yksittäisiä kruunuja tai zirkonia-runkoisia siltoja vuosina 2007–2010. Potilaista 94 oli naisia ja 79 miehiä (keski-ikä 55 vuotta, jakauma 18–79 vuotta). Kaiken kaikkiaan 268 zirkonia-kruunua (keskimäärin 3 kruunua, jakauma 1–12 kruunua potilasta kohti) oli valmistettu 88 potilaalle ja 120 siltaa (keskimäärin 4,5 yksikköä, jakauma 4,5 yksikköä) 102 potilaalle. Seitsemälletoista potilaalle oli tehty sekä kruunuja että siltoja. Tulokset osoittavat, että zirkonia-runkoiset kruunut ja sillat ovat käyttökelpoisia kiinteässä protetiikassa. Valmistuksenaikaiset ongelmat ja varhaiset epäonnistumiset ovat vähäisiä. Yksittäisten kruunujen selviytymisprosentti 3,9 vuoden jälkeen (2–6 vuotta) oli 89 % ja onnistumis-prosentti 80 %. Siltojen selviytymisprosentti 4,9 vuoden jälkeen (3–7 vuotta) oli 100 % ja onnistumisprosentti 89 %. Zirkonia-runkoiset kruunut toimivat hyvin rankojen tukihampaina, mutta niiden ongelmana ovat päällepolttoposliinin lohkeamat
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Costa, Anna Karina Figueiredo [UNESP]. "Comportamento biomecânico de estruturas multicamadas em restaurações protéticas." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/138191.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
O objetivo desse trabalho foi identificar por meio da utilização de geometrias complexas (pela análise de elemento finito) e simplificadas, se novas tecnologias (sistema CAD/CAM) resultam em um comportamento biomecânico mais favorável na cerâmica de cobertura quando comparado à técnica de aplicação convencional (estratificação). Foram modelados três diferentes estruturas de prótese parcial fixa de três elementos com diferentes técnicas de fabricação: convencional, Rapid Layer (feldspática, cimento resinoso e zircônia) e CAD-on (dissilicato, material vítrio de baixa fusão e zircônia) a fim de analisar a distribuição tensão de tração gerada durante um ensaio mecânico pelo método por elementos finitos. Discos (cerâmica de cobertura e zircônia) foram unidos seguindo as três diferentes técnicas (convencional, Rapid Layer e CAD-on). Foram também confeccionadas próteses parciais fixas de 3 elementos pela técnica de multicamada seguindo as mesmas configurações dos modelos utilizados na análise por elementos finitos. Essas coroas foram cicladas durante 2x106 ciclos para analisar falhas na cerâmica de cobertura, como trincas, lascamento, delaminação e falha catastrófica. Os resultados mostraram que as coroas confeccionadas com cerâmica de dissilicato de lítio e material vítreo na interface infraestrutura/cerâmica de cobertura apresentaram menor concentração de tensão de tração quando comparadas aos modelos confeccionados pela técnica convencional, que demonstraram maior concentração de tensão de tração entre as camadas (cerâmica de cobertura, interface e infraestrutura). Para os discos, o acréscimo de material na interface cerâmica de cobertura e infraestrutura mostrou maior resistência à fratura biaxial e menor propagação da trinca entre as camadas de cerâmica. As coroas cicladas não apresentaram falhas como: trincas, lascamento, delaminação e catastrófica nos primeiros 500.000 ciclos. Porém, as próteses confeccionadas com cerâmica feldspática apresentaram trincas a partir de 1x106 ciclos, diferentemente das coroas confeccionadas na técnica Rapid Layer e CAD-on. As coroas confeccionadas pela técnica RL e CAD-on podem ser consideradas um sistema favorável por prevenir a propagação de trincas radiais em direção à superfície da restauração e melhorar a tenacidade à fratura do material.
The aim was to identify whether the CAD/CAM approach resulted in more favourable stressing patterns in the veneer-ceramic when compared with a conventionally sintered Y-TZP core/veneer-ceramic. Three different designs crowns of prosthesis with three elements and different manufacturing techniques were modeled: conventional technique, Rapid Layer (feldspathic ceramic, resin cement and zirconia) and CAD-on (disilicate, fusion glass ceramic and zirconia) techniques to analyze the distribution stress tensile generated during a mechanical test by the finite element method. Moreover, were made feldspathic ceramic discs, lithium disilicate discs and Y-TZP zirconia discs to analyze the influence of biaxial flexure stress of these three different techniques. These discs (veneer ceramic and zirconia ceramic) were joined following the three different techniques (conventional, Rapid Layer and CAD-on). They were also made FPDs 3 elements: following the same design of models used in finite element analysis. These crowns were cycled during 2x106 cycles to analyze failure at veneer ceramic, such as cracks, chipping, delamination and catastrophic failure. The results showed that the crowns made from ceramic lithium disilicate and low fusion glass ceramic at the interface veneer ceramic/infraestructure showed low concentration of tensile stress when compared to models made by the conventional technique, which showed a greater concentration of tensile stress between layers (veneer ceramic, interface and infrastructure). For the discs samples, the multilayer materials showed lower crack propagation between the ceramic layers. The cycled crowns showed no failure as cracks, chipping, delamination and catastrophic failure for the first 500,000 cycles. However, the prostheses made with feldspathic ceramic showed cracks from 1.106 cycles. The incorporation of functionally and aesthetically graded layers would be realisable, considerable research would be required before the feasibility of the conceptual approach could be accurately assessed.
FAPESP: 2012/11095-0
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Salih, Mayson. "Disinfection Procedures: Effects on the dimensional accuracy of Gypsum casts." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3067_1257931628.
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The aim of the study was to assess the dimensional accuracy of Gypsum models following chemical disinfection of the impressions and to compare it with the accuracy of gypsum models exposed to microwave irradiation disinfection. Results indicated that the dimensional accuracy of the gypsum models disinfected in a microwave oven did not differ significantly from models in the control group. Except for models produced from SS white (SS White group, England) impressions where models irradiated in microwave exhibit significant improvement in the dimensional accuracy when compared with control group...
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Allport, David M. "Evaluation of two reference planes to the horizon in the natural head position." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2565.
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Thesis (M.S.)--West Virginia University, 2002.Title from document title page. Document formatted into pages; contains vii, 35 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 29-30).
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Zeiaei-Nafchi, Saeid. "Dimensional changes of poysulfide [sic] impression materials over time." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1300.
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Thesis (M.S.)--West Virginia University, 2000.Title from document title page. Document formatted into pages; contains vii, 47 p. : ill. (some col.) Vita. Includes abstract. Includes bibliographical references (p. 41-46).
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Chan, Hung-chiu Kingsley. "Cast keepers for dental magnets : effects of laboratory procedures /." View the Table of Contents & Abstract, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31490335.
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Begg, Tasneem. "Photoelastic stress patterns produced by the angled distal implants in the All-on-Four concept." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3791_1254295343.
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The purpose of this study was to investigate the stress produced around the angled distal implants under simulated occlusal loading in the All-on-Fourª
concept by means of two-dimensional photoelastic stress models.
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陳鴻釗 and Hung-chiu Kingsley Chan. "Cast keepers for dental magnets: effects of laboratory procedures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B45007706.
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Abu-Hammad, Osama Abdalla M. "The influence of some factors on compressive stress levels around dental implants." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337637.
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Bagewitz, Ingrid Collin. "Prosthodontics, care utilization and oral health-related quality of life." Malmö [Sweden] : Malmö högskola, Dept. of Prosthetic Dentistry, Dept. of Oral Public Health, Faculty of Odontology, 2007. http://catalog.hathitrust.org/api/volumes/oclc/122895139.html.
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O'Sullivan, Dominic. "The effect of implant geometry upon the primary stability of dental implants." Thesis, University of Bristol, 2001. http://hdl.handle.net/1983/339010c1-63ee-4eb9-b03c-b3a2b9b89dbf.
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Khan, Saadika B. "Mechanical and handling properties of light-cured acrylic resin custom tray material." Thesis, University of the Western Cape, 2007. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_4268_1227009157.
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Both light-cured (LC) and chemically-cured (CC) acrylic resin custom tray materials are used at the Oral Health Centre, Faculty of Dentistry, University of the Western Cape. At present, the CC acrylic is the standard for formal undergraduate teaching and training. The LC material is not part of routine didactic teaching as little evidence-based scientific information is available with regards to its properties and its usage in the clinical environment. Negative effects have caused researchers to focus on alternatives and to research for other materials with more advantageous properties. The objectives of this study was to determine the linear dimensional shrinkage and fracture toughness of light-cured acrylic custom tray materials and compare it to the chemically-cured type. Also to evaluate the acceptance of light-cured acrylic resin custom trays by undergraduate students.
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Overturf, Jan Hendrik. "The effects of diferent reinforcements on the fracture toughness of provisional restorative materials." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2033_1254998751.
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One of the most critical aspects of successful crown and bridgework is temporary restorations. Failure of temporary restoratins often affects the patient's confidence and mau result in unscheduled appointments for repair. This study compared the the fracture toughness of two materials commonly used to fabricate provisional restorations, namely Coldpac, a polymethyl methacrylate and Protemp 3 Garant, a bis-acryl composite. It also compard the fracture toughness of the two materials when reinforced with stainless steel wire, glass fibers and polythylene fibers.
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Mackie, Andrew, and n/a. "Mandibular two-implant overdentures : prosthodontic maintenance using different matrices with different loading strategies." University of Otago. School of Dentistry, 2007. http://adt.otago.ac.nz./public/adt-NZDU20071221.142609.
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Objective: To determine the long-term prosthodontic maintenance requirements of mandibular unsplinted, two-implant overdentures, using different attachment systems and loading protocols.
Materials and Methods: An original total of 106 participants were randomly allocated to one of four different implant systems (Brånemark, Steri-Oss, Straumann and Southern Implant systems). Three different loading strategies were used (2-weeks, 6-weeks and 12-weeks). A total of six different unsplinted attachment systems for mandibular two-implant overdentures were used with the four implant systems. These attachment systems included; the Brånemark gold matrix, Straumann gold matrix, Straumann titanium matrix, Southern Implants plastic matrix, Southern Implants palladium matrix and the Steri-Oss rubber matrix. Each matrix group was allocated to one or more loading strategies and data related to prosthodontic maintenance events was collected prospectively from overdenture insertion (baseline) to year eight, according to predefined categories. Data were analysed using SPSS, and levels of statistical significance were set at P < 0.05. To test for significance between multiple groups, ANOVA was used. Where a statistically significant difference existed, a one way ANOVA with Post Hoc tests was performed.
Results: A total of 90 participants from all matrix groups were followed for six-years and loading comparisons could only be made up to this time. The Southern palladium matrix was followed for only six-years therefore it could not be included in the eight year analysis. A total of 69 participants remained in the randomised controlled trial after eight years. Mandibular two-implant overdentures fitted with the Steri-Oss rubber matrix displayed the highest mean number of maintenance events at 32.2 (SD 14.5) followed by the Brånemark matrix group at 28.8 (SD 12.6), the Straumann titanium matrix group at 24.9 (SD 10.7) and the Straumann gold matrix group at 12.8 (SD 8.2), over an eight year period. The Southern plastic matrix group had the lowest average number of maintenance events (8.7 SD 4.2) over the eight-year period and this was significant compared with all other groups (P < 0.05). Over six years, there were no significant differences found between the number of prosthodontic maintenance events and the loading strategy used. On average, the Straumann gold matrix lasted for 3.9 (SD 2.1) years which was significantly longer than all other matrices (P < 0.05) over six years. The Southern palladium (3.1 SD 1.7), Brånemark gold (2.7 SD 1.5) and Southern plastic (2.5 SD 1.4) matrices all lasted significantly longer than the Straumann titanium (1.7 SD 0.8) and the Steri-Oss rubber (1.4 SD 0.7) matrices over six years.
Conclusions: Mandibular two-implant overdentures using the Southern Implants plastic cap required significantly less prosthodontic maintenance events compared with all other matrix groups. The Straumann gold matrix required significantly less prosthodontic maintenance compared with the Steri-Oss rubber matrix (P<0.05). The Straumann gold matrix also demonstrated the greatest longevity compared with all other matrices (P<0.05). There was no significant difference in the number of prosthodontic maintenance events of two-implant overdentures when loaded at 2, 6 or 12-weeks after implant placement. The prosthodontic maintenance requirements of unsplinted mandibular two-implant overdentures are dependant upon the attachment system chosen.
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Shaw, Andrew John. "The durability of indirect composite veneers : a clinical and laboratory study." Thesis, University of Newcastle Upon Tyne, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366546.
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Carneiro, Lorna Celia. "Surface characteristics and in vitro bio-acceptability of machined and cast pure titanium and titanium alloy." Thesis, Access to E-Thesis, 2003. http://upetd.up.ac.za/thesis/available/etd-09302005-135346/.
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Coco, Suzanne Kemp. "A mechanical and histological study of functionally graded hydroxyapatite implant coatings." View the abstract Download the full-text PDF version, 2008. http://etd.utmem.edu/ABSTRACTS/2008-009-Coco-index.html.
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Thesis (M.S.)--University of Tennessee Health Science Center, 2008.Title from title page screen (viewed on June 10, 2008). Research advisor: Joo Leng Ong, Ph.D. Document formatted into pages (vi, 34 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 31-34).
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Kelly, Philip G. "Long-term survival and cost-effectiveness of fixed prostheses in continuously attending patients at three private dental practices /." Title page, contents and summary only, 1998. http://web4.library.adelaide.edu.au/theses/09DM/09dmk29.pdf.
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Brandt, Paul Dieter. "Shear bond strength, microleakage and anti-bacterial properties of self-etching bonding systems." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-02182010-110040/.
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Selecman, Audrey Marie. "Evaluation of osseointegration between two different modalities of hydroxyapatite implant surface coatings plasma sprayed HA coated implants and electrophoresis deposited nano HA coated implants /." View the abstract Download the full-text PDF version, 2007. http://etd.utmem.edu/ABSTRACTS/2007-008-Selecman-index.html.
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Thesis (M.S. )--University of Tennessee Health Science Center, 2007.Title from title page screen (June 30, 2008). Research advisor: Joo L. Ong, Ph.D. Document formatted into pages (vi, 47 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 41-46).
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Latief, Abduraghman. "Sorption and solubility of a denture base acrylic." Thesis, Cape Peninsula University of Technology, 2012. http://hdl.handle.net/20.500.11838/1533.
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Thesis submitted in fulfilment of the requirements for the degree
Master of Technology: Dental Technology
in the Faculty of Health and Wellness Sciences
at the Cape Peninsula University of Technology, 2012Statement of problem It is well documented that water sorption and water solubility by auto-polymerizing resins have a negative impact on their physical properties and may lead to harmful tissue reactions. The presence of residual monomer is often identified as the main cause for adverse tissue reactions. To optimize the polymerization reaction, the use of the proper powder/liquid ratio is recommended in the fabrication of a dental appliance. It is also recommended that a dental appliance should be soaked in water for at least 24 hours before delivery to a patient, in order to reduce the possible adverse effect. For auto-polymerizing resins, associated with higher residual monomer levels than heat-cured resins, soaking the appliance at elevated temperatures (65ºC for 60 minutes), would reduce the residual monomer content more efficiently than at room temperature. This requires additional processing conditions from the technician or dentist. Changing the powder/liquid ratios, deliberately or not, may modify the residual monomer content of the final product. A relationship exists between the levels of residual monomer and water sorption. Also, residual monomer leaching into the oral fluids may lead to adverse effects such as, oral tissue irritation or a delayed hypersensitivity reaction. Aim of the study The aim of this study was to evaluate the effect of different powder/liquid ratios and different water temperatures on the levels of sorption and solubility of an auto-polymerizing resin material used for denture bases. The null-hypothesis tested was that there is no difference in sorption and solubility among groups of specimens made from an auto-polymerizing resin material soaked in water at different temperatures and/or fabricated with different powder/liquid ratios. Material and methods Specimens were made from cold-cure pour-type denture base resin (Type 2, Class 2) using different powder/liquid ratios and soaked at different soaking temperatures. One group of specimens fabricated with the manufacturer’s recommended powder/liquid ratio and soaked in water at 37ºC, served as the control group for both experiments. Custom-made stainless steel moulds were used to fabricate resin disks, with a diameter of 50mm and a thickness of 0.5mm. For the temperature-controlled experiment, identical specimens were prepared and stored in distilled water at 37ºC; 45ºC; 55ºC and 67ºC. For the ratio-controlled experiment, the ratios were increased incrementally for each group, starting with a 10% increase, followed by a 15%; 20% and 25% increase in monomer. Water sorption and solubility were tested in accordance with ISO Standard 1567 (1999). Specimens were weighed before and after water immersion, and desiccation. Water sorption and solubility were calculated using the difference in wet and dry mass and the volume of the specimens. The water sorption and solubility results were analyzed by means of analysis of variance. For multiple comparisons, Bonferroni simultaneous confidence intervals (α=0.05) were applied. Results For the ratio-controlled experiment, water sorption mean values varied from 24.148 μg/mm3 to 25.1333 μg/mm3. Statistically significant differences in mean values were found between the following groups: 0%-10%; 0%-15%; 0%-25%; 10%-20%; 15%-20% and 20%-25% ratio groups (P<.0001). Water solubility mean values varied from 0.616μg/mm3 to 0.932μg/mm3. Statistically significant differences in mean values were found between the following groups: 0%-15%; 0%-20%; 0%-25% and 10%-25% and 20%-25% ratio groups (P<.0001). For the temperature-controlled experiment, water sorption mean values varied from 24.185μg/mm3 to 26.434μg/mm3. Statistically significant differences in mean values were found between the following groups: 37ºC-45ºC; 37ºC-55ºC; 37ºC-67ºC; 45ºC-67ºC and 55ºC-67ºC temperature-controlled experiments (P<.0001). Water solubility mean values, for the same experimental groups, varied from 0.616μg/mm3 to 2.752μg/mm3. Statistically significant differences in mean values were found among all the 6 pairs of groups (P<.0001). Despite statistical differences, the water sorption and water solubility values of the tested resin for both experiments and all groups were within the ISO Standard 1567 (1999) specification limits. Conclusion For the ratio-controlled experiment, there was an inverse relationship between the mean sorption and solubility values with an increase in liquid in the mixture: low water sorption levels are associated with high solubility levels. The lower water sorption and higher solubility results for more fluid mixtures could be related to initial and residual high monomer content characteristic of auto-polymerizing materials. These higher levels of free monomer are consequently released upon immersion in water; hence the higher water solubility levels. For the temperature-controlled experiment, a higher soaking temperature resulted in an increase in water solubility levels. The higher solubility levels could be attributed to the higher soaking temperatures causing higher or faster monomer diffusion from the resin material. Except for the 67ºC group, sorption is also lower with higher temperatures. It may be assumed that an additional polymerization process takes place and a subsequent more inaccessible polymer matrix is produced. For the 67ºC group, thermal expansion may explain the higher sorption level. Clinical Implications In terms of the sorption and solubility results, this auto-polymerizing pour-type resin may be used as a denture base resin. Even though statistical differences were demonstrated, the material satisfies the ISO 1567 (1999) requirements not only for auto-polymerizing but also for heat-polymerizing resins. Therefore, within limits, the mixture may be prepared more fluidly in order to improve flow of the material, without negatively affecting its sorption and solubility properties. Because solubility is higher at higher soaking temperatures, this property can be used to minimize monomer content of the appliance. Therefore, it is recommended that the dental appliance be soaked in warm water, below 67ºC, prior to delivery to the patient.
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Aroso, Ribeiro Carlos Manuel. "Retención y desgaste de tres sistemas de "attachment" para prótesis totales mandibulares sobre implantes - Estudio in Vitro." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/401680.
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Mandibular overdentures retained by two implants are recognised as the first option for treating patients without teeth, as stated by the McGill University (Canada) in its consensus statement in 2002 and the British Society to the prosthodontics study, in your consensus statement of York, published in 2009. Compared to conventional full prosthesis, they provide greater satisfaction for the patient, greater chewing ability and preservation of the residual crest height.
Purpose: This in vitro study was investigated and compare the durability and retention capacity of 3 types of attachments. Our working hypothesis states that there is no significant retention loss in different systems "attachments" tested and used in implant supported overdentures over the time and no wear in the metal components that`s requiring replacement during the same period.
Materials and Methods: Three commercially available attachments were investigated:(Clix®: Preat Corporation, Santa Ynez, CA, United States; Dalbo-Plus®: Cendres+ Métaux, Biel/Bienne, Switzerland; Locator®: Zest Anchors,Inc ,Escondido, United States), 3 different abutments inclinations (0°, 10° and 20°) . The 72 attachments were placed in acrylic resin form and they were then subjected to mechanical testing (5400 cycles of insertion and removal) over the respective ball or Locator abutments immersed in artificial saliva at pH7 and 37°C, and retention values recorded at eight different times (at the beginning, one month, six months, a year, two years, three years, four years and five years).
Results: The results revealed that there were significant differences in the average values of insertion/removal force due to the angulation (F (2, 48) =343619, p<0.05) and the type of attachment (F (7, 48) = 23.220, p < 0.05). An analysis of the results showed that the retention average (insertion and removal) for attachments was always more in inclination of 0° than inclination of 20°.
Conclusions: All attachments were tested lose the maximum value of retention force. The abutment inclination influences the intrinsic strength value of each attachment and have effect on its durability over the period of time.Las sobredentaduras mandibulares retenidas por dos implantes son reconocidas como la primera opción de tratamiento para pacientes edéntulos, tal como recoge la Universidad McGill (Canadá) en su declaración de consenso publicada en 2002 y la sociedad británica para el estudio de la odontología protésica, en su declaración de consenso de York, publicada en 2009. Al compararlas con prótesis completas convencionales, proporcionan una mayor satisfacción del paciente, una mayor capacidad masticatoria y una preservación de altura de la cresta residual. El objetivo de este trabajo es evaluar la durabilidad y capacidad de retención de attachments a largo del tiempo en inclinación de 0°, 10° e 20° y en saliva artificial a 37°C.El diseño experimental tomó en cuenta la existencia de 3 tipos distintos de sistemas de attachments (Clix®: Preat Corporation, Santa Ynez, CA, United States; Dalbo-Plus®: Cendres+ Métaux, Biel/Bienne, Suiza; Locator®: Zest Anchors,Inc ,Escondido, United States), 3 inclinaciones diferentes y uno tipo de saliva artificial ( pH 7). Los 72 attachments fueron testados en una máquina de ensayo de fatiga durante 5400 ciclos (cinco años) y se registraron los valores de retención en ocho momentos diferentes (inicio, un mes, seis meses, un año, dos años, tres años, cuatro años, cinco años).El análisis de los resultados demostró que la media de retención (inserción y desinserción) de los attachments fue siempre mayor en inclinación de 0° do que en inclinación de 20°. Todos los attachments del estudio han perdido valor máximo de retención.La inclinación influye en el valor de la fuerza intrínseca de cada attachment y tiene influencia en su durabilidad a lo largo del tiempo.
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Oliveira, José Luiz Góes de. "Avaliação da tensão formada na região periimplantar após a instalação de próteses parciais fixas parafusadas e cimentadas." Universidade Federal de Sergipe, 2013. https://ri.ufs.br/handle/riufs/3570.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorPassivity fit of an implant fixed partial denture (FPD) is one of major factor in treatment success. Among various factors that influence the passive fit of a prostheses is the kind of retained. Thus, the aim of this study was to evaluate, with the aid of linear strain gages (gauges), the tension generated around two implants after installation of a three-unit implant FPD. Five groups were analyzed (n = 5): 1. Control (only the abutments on implants); 2. Cement-retained prosthesis; 3. Screw-retained prosthesis made from plastic cylinders; 4. Screw-retained prosthesis made from Co-Cr machined collar abutments; 5. Hybrid prosthesis (cemented / screwed). For the investigation, homogeneous polyurethane experimental model with two parallel external hexagon implants was used. From this model, transfer impression and one master stone cast was made on which all frameworks were made accompanying a wax pattern. Aiming to measure the tensions, four strain gauges for each implant placed in the mesial, distal, buccal and lingual were glued on the top surface of the experimental block. The tests were performed by installing the samples on the implants according to the characteristics of each group. Five repetitions of readings for each specimen were performed. One-way ANOVA and Tukey test were applied to the average values (p <.05). The mean and standard deviation were obtained: Group 1 (48.71 με ± 0.29), Group 2 (60.03 με ± 22.65) and group 3 (254.15 με ± 46.23), Group 4 (215,42 με ± 30.48), Group 5 (70.05 με ± 13.78). These results showed that the cement-retained prostheses have the ability to produce less stress on the peri-implant area when compared to the screw-retained prosthesis (p≤.05). It was observed that the hybrid group had similar performance to the cement-retained prostheses and the control group (p>.05). Furthermore, the screw-retained prosthesis made from plastic cylinders showed similar performance to the Co-Cr machined collar abutments (p>.05). Finally, these results demonstrated that the generated tension to the peri-implant tissues is directly related to the type of retention.
A passividade de assentamento de uma prótese parcial fixa sobre implantes é um fator primordial para o sucesso no tratamento. Dentre vários fatores que interferem na adaptação passiva de uma prótese está o tipo de retenção utilizado. Desta forma, o objetivo deste estudo foi avaliar, com o auxílio de extensômetros elétricos lineares (strain gauges), a tensão gerada ao redor de dois implantes após assentamento de uma prótese parcial fixa implantossuportada de 3 elementos. Cinco grupos foram analisados (n=5): 1. Controle (apenas os munhões sobre os implantes); 2. Prótese Cimentada; 3. Prótese Parafusada confeccionada com cilindros plásticos; 4. Prótese Parafusada confeccionada com cilindros com base de Co-Cr; 5. Prótese híbrida (cimentada/parafusada). Para a investigação, foi utilizado um modelo experimental homogêneo a base de poliuretano com dois implantes hexágono externo paralelos entre si. Visando medir as tensões, foram colados na superfície superior do bloco experimental quatro strain gauges para cada implante, posicionados nas faces mesial, distal, vestibular e lingual. Os testes foram executados instalando os corpos de prova sobre os implantes de acordo com as características de cada grupo. Realizou-se 5 repetições de leituras para cada corpo de prova. Análise de variância e teste de Tukey foram aplicados sobre os valores médios obtidos, utilizando um nível de significância de 0,05. A média e desvio-padrão obtidos foram: Grupo 1 (48,71 με ± 0,29); Grupo 2 (60,03 με ± 22,65); Grupo 3 (254,15 με ± 46,23), Grupo 4 (215,42 με ± 30,48), Grupo 5 (70,05 με ± 13,78). Esses resultados mostraram que as próteses cimentadas geraram menos tensão à região periimplantar quando comparadas às próteses parafusadas (p=0,0004/p=0,0008). Observou-se que o grupo híbrido teve desempenho semelhante às próteses cimentadas e ao grupo controle (p=0,9540/p=0,3402). Além disso, as próteses parafusadas confeccionadas com cilindros plásticos apresentaram desempenho semelhante às confeccionadas com cilindros com a base de Co-Cr (p=0,1580). Por fim, estes resultados demonstraram que a tensão gerada aos tecidos perimplantares está diretamente relacionada ao tipo de retenção.
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Kern, M., W. Att, E. Fritzer, S. Kappel, R. G. Luthardt, T. Mundt, D. R. Reissmann, et al. "Survival and Complications of Single Dental Implants in the Edentulous Mandible Following Immediate or Delayed Loading: A Randomized Controlled Clinical Trial." Sage, 2018. https://tud.qucosa.de/id/qucosa%3A35799.
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It was the aim of this 24-mo randomized controlled clinical trial to investigate whether the survival of a single median implant placed in the edentulous mandible to retain a complete denture is not compromised by immediate loading. Secondary outcomes were differences in prosthetic complications between the loading principles. Each of the 158 patients who received an implant was randomly assigned to the immediate loading group (n = 81) or the delayed loading group (n = 77). Recall visits were performed 1 mo after implant placement (for only the delayed loading group) and 1, 4, 12, and 24 mo after implant loading. Nine implants failed in the immediate loading group, all within the first 3 mo of implant loading, and 1 implant failed in the delayed loading group prior to loading. Noninferiority of implant survival of the immediate loading group, as compared with the delayed loading group, could not be shown (P = 0.81). Consistent with this result, a secondary analysis with Fisher exact test revealed that the observed difference in implant survival between the treatment groups was indeed statistically significant (P = 0.019). The most frequent prosthetic complications and maintenance interventions in the mandible were retention adjustments, denture fractures, pressure sores, and matrix exchanges. There was only 1 statistically significant difference between the groups regarding the parameter “fracture of the denture base in the ball attachment area” (P = 0.007). The results indicate that immediate loading of a single implant in the edentulous mandible reveals inferior survival than that of delayed loading and therefore should be considered only in exceptional cases (German Clinical Trials Register: DRKS00003730).
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Rocha, Elissa Almeida. "Avaliação do destorque do parafuso protético de diferentes tipos de conexões com coroas longas." Universidade Federal de Juiz de Fora (UFJF), 2014. https://repositorio.ufjf.br/jspui/handle/ufjf/5333.
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CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
O objetivo deste estudo foi avaliar a influência de diferentes conexões no destorque do parafuso Neotorque sobre implantes com proporção coroa - implante (2:1), estudo in vitro, após ciclagem mecânica. Trinta implantes de 9 mm x 3,75 mm (Neodent®-Curitiba, Paraná, Brasil) foram utlizados, sendo 10 de cada tipo de conexão (CM,HE, HI) com seus respectivos munhões universais: (CM) ( 3,3/6/3,5), HE e HI ( 4,5,6,3) (Neodent®-Curitiba, Paraná, Brasil). Os implantes foram inseridos individualmente em resina acrílica (JET, Clássico, São Paulo, Brasil) com auxílio de um cilindro calcinável padronizado ( 2,5x1,5). O torque nos parafusos foi feito com torquímetro digital (Lutron TQ – 680, Impac, São Paulo), o grupo HE recebeu 30 N.cm, o grupo CM 15 N.cm e o grupo HI 20N.cm. Posteriormente a aplicação do torque, as coroas foram posicionadas sobre os pilares protéticos com vaselina sólida (Farmax, Divinópolis, Brasil) e em seguida foram submetidos à ciclagem mecânica (Simulador de Fadiga Mecânica, ERIOS, modelo ER – 11000), com aplicação de uma carga de 120N, 75 ciclos/s por 1.000.000 ciclos a 1 Hz, submersos em água destilada. Por fim, o destorque foi mensurado com o auxílio de um torquímetro digital (Lutron TQ-680, Impac, São Paulo/SP). Os valores de média de destorque (desvio padrão) obtidos após ciclagem mecânica foram: CM - 13,4 (1,83) N.cm, HI – 17 (1,69) N.cm e HE – 25,6 (1,95) N.cm. O teste de ANOVA (p<0,05) mostrou que não houve diferença estatisticamente significante entre os grupos (p=0,526) com relação aos diferentes tipos de conexão pilar - implante e a proporção coroa (2) – implante (1) após ciclagem mecânica. Para avaliar cada grupo independentemente em relação a perda de carga do torque de fechamento após ciclagem mecânica, foi realizada o teste t de student independente (p<0,05), obteve-se resultado estatisticamente significante para perda de torque inicial dentro de cada grupo: CM (0,022), HI (0,00) e HE (0,00). Concluiu-se que o tipo de conexão pilar - implante e da proporção coroa – implante (2:1) não influenciou na perda de torque após a ciclagem mecânica; a ciclagem mecânica influenciou na perda de torque dentro de cada grupo de conexão pilar – implante.
The aim of this study was to evaluate the influence of different connections in detorque Neotorque screw implant with crown ratio - implant (2:1), in vitro study, after mechanical cycling. Thirty of 9 mm x 3.75 mm (Neodent®-Curitiba, Paraná, Brazil) were utlizados implants, 10 of each connection type (CM, HE, HI) with their universal posts: (CM) ( 3, 3/6 / 3,5), HE and HI ( 4,5,6,3) (Neodent®-Curitiba, Paraná, Brazil). The implants were inserted individually in acrylic resin (JET, Classic, São Paulo, Brazil) using a standardized burn-cylinder ( 2,5x1,5). The torque on the bolts was done with digital torque meter (Lutron TQ - 680, Impac, São Paulo), the HE group received 30 N.cm, the CM group and 15 N.cm the HI group 20N.cm. Subsequently the application of torque, the crowns were placed on the abutments with petrolatum (Farmax, Divinópolis, Brazil) and then were subjected to mechanical cycling (Simulator Mechanical Stress, Erios, ER Model - 11000), with application of a 120N load, 75 cycles / sec per 1 million cycles at 1 Hz, immersed in distilled water. Finally, the detorque was measured with the aid of a digital torque meter (Lutron TQ-680, Impac, São Paulo / SP). The (standard deviation) values of average detorque obtained after mechanical cycling were: CM - 13.4 (1.83) N.cm, HI - 17 (1.69) and HE N.cm - 25.6 (1, 95) N.cm. The ANOVA test (p <0.05) showed no statistically significant difference between groups (p = 0.526) with respect to different types of abutment connection - implant and the crown ratio (2) - implant (1) after cycling mechanics. To evaluate whether each group compared to the pressure drop in torque after mechanical closure cycling, independent Student t (p <0.05) was performed, there was a statistically significant result for loss of initial torque in each group : CM (0.022), HI (0.00) and HE (0.00). It was concluded that the type of abutment connection - implant and crown ratio - implant (2: 1) no effect on the loss of torque after mechanical cycling; mechanical cycling effect on the loss of torque within each group of connection pillar - implant.
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Júnior, Clebio Domingues da Silveira. "Estudo clínico prospectivo utilizando implantes curtos unitários posteriores." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-12072011-162011/.
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O objetivo deste estudo foi avaliar clínica e radiograficamente implantes curtos com 5 e 6 mm de comprimento (Titamax WS Neodent/ Curitiba-Brasil) unitários instalados em região posterior de mandíbula e maxila com pouca altura óssea. Foram instalados 10 implantes em 8 pacientes devidamente selecionados a partir de critérios de inclusão pré-determinados. Os mesmos receberam carregamento protético somente após o tempo convencional de espera para a osseointegração. Seis implantes foram instalados em mandíbula e 4 implantes em maxila. Tomadas radiográficas foram realizadas para avaliação das perdas ósseas verticais e horizontais nos tempos T0 (Instalação cirúrgica), T1 (Reabertura), T2 (Instalação protética) e T3 (Acompanhamento de 6 meses). Foram avaliados parâmetros biológicos como, sangramento gengival, índice de mucosa ceratinizada, índice de placa e índice de inflamação gengival. Também foram avaliados parâmetros protéticos como proporção coroa-implante e distância mesiodistal. Apenas um implante (Titamax WS Cortical 5.0x6.0) foi perdido ainda no período de osseointegração portanto o índice de sucesso foi de 90% no período avaliado. A alteração do nível ósseo foi analisada em três períodos diferentes, da instalação cirúrgica à cirurgia de reabertura (período 1), da reabertura à instalação protética (Período 2) e da instalação protética ao controle de seis meses (Período 3). Avaliando-se a perda óssea vertical nos três períodos separadamente foram encontrados valores muito semelhantes, inclusive iguais estatisticamente (ANOVA, p<0,05). O valor de perda óssea no período 1 foi de 0,32mm; no período 2 foi de 0,22mm e no período 3 foi de 0,29mm. Isso significa que os procedimentos cirúrgicos foram igualmente causadores de perda óssea marginal mesmo tomando-se alguns cuidados na execução destas etapas. A média de perda óssea vertical e horizontal no período total de acompanhamento foi de 0,87 ±0,46 e 0,24± 0,34 respectivamente. Estes valores foram considerados dentro do intervalo de perda óssea esperado. A boa condição de saúde gengival e higiene oral descartaram a possibilidade de associação entre os índices periodontais e a perda óssea periimplantar. O teste estatístico de Regressão Linear (p<0,05) mostrou não haver relação de causa/efeito entre perda óssea e os parâmetros protéticos, apesar de elevada proporção coroa/implantes (média 1,88). Com base nos resultados encontrados neste trabalho, concluiu-se que os implantes curtos, mesmo os de comprimento 5 e 6mm, devem ser considerados como uma importante alternativa de tratamento para casos unitários. Sugere-se porém, um maior tempo clínico de acompanhamento para que seja possível traçar um perfil do comportamento destes implantes a longo prazo.The aim of this study was to evaluate clinically and radiographically short unit implants with 5 and 6 mm in length (Titamax WS - Neodent / Curitiba, Brazil) installed in the posterior mandible and maxilla with little bone height. Ten implants were installed in eight carefully selected patients from inclusion criteria pre-determined. They received prosthetic loading only after the conventional time waiting for the osseointegration. Six implants were placed in the mandible and four implants in the maxilla. Radiographs were performed to evaluate the vertical and horizontal bone loss in T0 (surgery installation), T1 (uncovering), T2 (prosthetic installation) and T3 (follow-up of 6 months). Biological parameters were evaluated such as gingival bleeding index, keratinized mucosa amount, plaque index and gingival inflammation index. Prosthetic parameters were also evaluated as crown-implant ratio and mesiodistal distance. Only one implant (Titamax WS Cortical 5.0x6.0) was lost, it occurred during the healing fase. Therefore the success rate was 90% in the period. Bone level change was analyzed in three different periods, from surgical installation to uncovering surgery (1st period), from uncovering to prosthetic installation (2nd Period) and from prosthetic installation prosthetic to six months control (3rd Period ). Vertical bone loss values were very similar when evaluated in the three periods separately, even the same statistically (ANOVA, p <0.05). The amount of bone loss in 1st period was 0.32 mm in the 2nd period was 0.22 mm and in the 3rd period was 0.29 mm. This means that surgical procedures were also cause marginal bone loss even taking some care in implementing these steps. The average vertical and horizontal bone loss in the total period of observation was 0.87 ± 0.46 and 0.24 ± 0.34 respectively. These values were considered within the range of bone loss expected. The gingival good condition of health and oral hygiene ruled out the possibility of an association between periodontal indices and bone loss. Statistical analysis of linear regression (p <0.05) showed no cause and effect relationship between bone loss and prosthetic parameters, despite the high crown / implant ratio (average 1.88). Based on the findings of this study, it was concluded that short implants, even the 5 and 6 mm in length, should be considered as an important alternative treatment for single crows. It is suggested a longer clinical follow-up to make it possible to trace a pattern of behavior of these implants over the long term.
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Martins, Maria Elizabeth Marques Nogueira. "Efeito de diferentes soluções na limpeza sônica dos precipitados do ácido fluorídrico sobre a resistência de união entre uma cerâmica feldspática e um cimento resinoso." Universidade Federal de Juiz de Fora (UFJF), 2009. https://repositorio.ufjf.br/jspui/handle/ufjf/2739.
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O objetivo deste trabalho foi avaliar a hipótese: diferentes soluções utilizadas na limpeza sônica dos precipitados do ácido fluorídrico influenciam os valores de resistência de união entre uma cerâmica feldspática e um cimento resinoso. Foram confeccionados 20 blocos cerâmicos (VITA VM7®), os quais foram duplicados em resina composta (W3D®). Os blocos foram aleatoriamente divididos em quatro grupos (n = 5): G1 – AFL 9,6% (Dentsply®) por 20 segundos seguido pela lavagem jato ar-água (60 segundos) e secagem (Controle); G2 – AFL 9,6% por 20 segundos + limpeza sônica (Vitasonic®) com água destilada por 4 minutos e secagem; G3 – AFL 9,6% por 20 segundos + limpeza sônica com acetona 99,5% e secagem; G4 – AFL 9,6% por 20 segundos + limpeza sônica com álcool 70% por 4 minutos e secagem. Posteriormente, cada bloco cerâmico, foi silanizado Porcelain Primer (Dentsply®) e unido, com o cimento resinoso Rely XTM ARC, ao seu correspondente de resina composta. Cada conjunto cerâmica-cimento-resina composta foi seccionado no sentido X e Y, obtendo-se amostras (áreas reduzidas e padronizadas), com 1,0 mm2 de área adesiva. As amostras foram fixadas em um paquímetro adaptado, que foi acoplado em uma máquina de ensaios universal (EMIC) com célula de carga de 10 Kgf, velocidade de 1,0 mm/minuto e submetidos ao ensaio de tração. Os dados foram submetidos à análise de variância (ANOVA) e ao teste de Tukey com níveis de significância de 5%. Os valores de resistência de união e os desvios-padrão (MPa) para os grupos foram: G1) 16,60 ± 0,52a; G2) 18,75 ± 0,37b; G3) 16,09 ± 0,92a e; G4)15,75 ± 1,38a. A limpeza sônica póscondicionamento resultou em diferenças significantes (p < 0.05) entre os grupos. Com base nos resultados obtidos foi possível concluir que a limpeza sônica dos precipitados do ácido fluorídrico com água destilada, aumentou os valores de resistência de união. A limpeza sônica não alterou os valores de resistência de união quando se utilizou como solução acetona 99,5% e álcool 70%.
The objective of this study was to evaluate the hypotheses: different ultrasonic cleaning media of the hydrofluoric acid precipitates influence the values of union resistance between ceramic feldspatic and resinous cement. Twenty blocks of Vita VM7 ceramic (VITA ® ) were obtained. The cementation surface of each block was duplicated in resin composite (W3D ® ). Ceramic blocks were randomly assigned in to 4 groups (n = 5/per group): G1 – etching with 9,6% AFL (Dentsply ® ) for 20s + rinsing with water spray for 60s + drying (Control); G2 – 9,6% AFL for 20s + rinsing with water spray for 60s + ultrasonic cleaning (Vitasonic ® ) in distilled water for 4 min + drying; G3 – 9,6% HF for 20s + rising with water spray for 60s + ultrasonic cleaning in acetone 99,5% 4 min + drying; G4 – 9,6% AFL for 20s + rinsing with water spray for 60s + ultrasonic cleaning in alcohol 70% for 4 min + drying . The ceramic blocks were silanized Porcelain Primer (Dentsply ® ) and cemented to the composite blocks using the resin cement RelyXTM ARC. The cemented blocks were sectioned in to axes (X and Y) with a diamond disk under coolant irrigation in order to obtain microbars with 1,0 mm² of bonding area. Each bar was attached to an adapted device and the microtensile test was performed using a universal testing machine (crosshead speed: 1 mm/min. The bond strengths and SD in Mpa were as follows: G1) 16,60 ± 0,52a; G2) 18,75 ± 0,37b; G3) 16,09 ± 0,92a e; G4)15,75 ± 1,38a. Utrasonic cleaning media after etching resulted in signifant difference among the groups (p < 0,05) (One-way ANOVA and Tuckey test). Only ultrasonic cleaning in distilled water demonstrated the highest bon strength with the tested resin-cement to feldspatic ceramic. Ultrasonic cleaning in acetone 99,5% and alcohol 70% did not affect the bond results.
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Franca, Danilo Gonzaga Bernardo de. "Influ?ncia da t?cnica de fabrica??o e dos materiais sobre o ajuste da interface pilar/implante em infraestruturas implantossuportadas." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17828.
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Previous issue date: 2013-03-22The aim of this study was to compare the misfit vertical, horizontal and passivity of zirconia and cobalt-chromium frameworks fabricated for CAD / CAM technology and conventional method of casting. Sixteen frameworks in one-piece, were obtained from a metallic matrix containing three Br?nemark compatible implants with regular platform (Titamax Cortical Ti, Neodent). Eight frameworks were fabricated by CAD / CAM system (NeoShape, Neodent): four in zirconia (ZirCAD) and four cobalt-chromium (CoCrcad). Eight other frameworks were obtained by conventional casting method: four cobalt-chromium with UCLA abutment premachined Co-Cr (CoCrUCci) and four cobalt-chromium with UCLA abutment castable (CoCrUCc). The fit vertical, horizontal and passivity by one-screw test were measured using scanning electron microscopy with magnification of 250x. Initially evaluated the passivity by one-screw test and subsequently to assess the vertical and horizontal misfit, tightened all the screws with a torque of 20 Ncm. Mean, standard deviation, minimum and maximum values were calculated for each group. Measurements of horizontal misfit were transformed into cumulative frequency for categorization of the variable and the group later comparison groups. To evaluate the existence of quantitative differences between the groups tested for vertical misfit and passivity, we used the Kruskal-Wallis test. The Mann-Whitney test was used to compare group to group statistical differences (p <0.05). Were observed the respective mean and standard deviation for vertical misfit and passivity in micrometers: ZirCAD (5.9 ? 3.6, 107.2 ? 36), CoCrcad (1.2 ? 2.2, 107.5 ? 26 ), CoCrUCci (11.8 ? 9.8, 124.7 ? 74), CoCrUCc (12.9 ? 11.0, 108.8 ? 85). There were statistical differences in measures of vertical misfit (p = 0.000). The Mann-Whitney test revealed statistical differences (p <0.05) between all groups except between CoCrUCci and CoCrUCc (p = 0.619). No statistical difference was observed for the passivity. In relation to the horizontal misfit groups ZirCAD and CoCrcad did not show best values in relation to CoCrUCci and CoCrUCc. Based on the results it can be concluded that frameworks fabricated by CAD / CAM technology had better values of vertical fit than those manufactured by the casting method, nevertheless, the passivity was not influenced by manufacturing technique and material used. The horizontal fit obtained by frameworks manufactured by CAD / CAM was not superior to those manufactured by casting. A lower variability in vertical adjustment and passivity was observed when frameworks were fabricated by CAD / CAM technology
O objetivo deste estudo foi comparar o desajuste vertical, horizontal e a passividade de infraestruturas fabricadas em zirc?nia e cobalto-cromo por tecnologia CAD/CAM e pelo m?todo da fundi??o convencional. Dezesseis infraestruturas em monobloco, foram obtidas a partir de uma matriz met?lica contendo tr?s implantes Br?nemark compat?veis de plataforma regular (Titamax Cortical Ti, Neodent). Oito infraestruturas foram confeccionadas pelo sistema CAD/CAM (NeoShape, Neodent): quatro em zirc?nia (Zircad) e quatro em cobalto-cromo (CoCrcad). Outras oito infraestruturas foram obtidas pelo m?todo da fundi??o convencional: quatro em cobalto-cromo com pilar UCLA cinta Co-Cr (CoCrUCci) e quatro em cobalto-cromo com pilar UCLA calcin?vel (CoCrUCc). O ajuste vertical, horizontal e a passividade pelo teste do parafuso ?nico foram mensurados usando microscopia eletr?nica de varredura com aumento de 250x. Inicialmente avaliou-se a passividade pelo teste do parafuso ?nico e posteriormente para avaliar o desajuste vertical e horizontal, apertou-se todos os parafusos, com torque de 20Ncm. M?dia, desvio padr?o, valor m?nimo e m?ximo foram calculados para cada grupo. As medidas de desajuste horizontal foram transformadas em frequ?ncia cumulativa para categoriza??o da vari?vel e posterior compara??o grupos a grupo. Para avaliar a exist?ncia de diferen?as quantitativas entre os grupos testados para desajuste vertical e passividade, foi usado o teste Kruskal-Wallis. O teste Mann-Whitney foi usado para comparar as diferen?as estat?sticas grupo a grupo (p<0,05). Foram observados os respectivos valores de m?dia e desvio padr?o em micr?metros para desajuste vertical e passividade: Zircad (5,9 ? 3,6; 107,2? 36), CoCrcad (1,2 ? 2,2; 107,5? 26), CoCrUCci (11,8 ? 9,8; 124,7? 74), CoCrUCc (12,9 ? 11,0; 108,8? 85). Observaram-se diferen?as estat?sticas para medidas de desajuste vertical (p=0,000). O teste Mann-Whitney revelou diferen?as estat?sticas (p<0,05) entre todos os grupos, exceto entre CoCrUCci e CoCrUCc (p=0,619). Nenhuma diferen?a estat?stica foi observada para a passividade das infraestruturas. Em rela??o ao desajuste horizontal, os grupos ZirCAD e CoCrcad n?o apresentaram melhores valores em rela??o a CoCrUCci e CoCrUCc. Baseado nos resultados pode-se concluir que infraestruturas confeccionadas por tecnologia CAD/CAM obtiveram melhores valores de ajuste vertical que aquelas fabricadas pelo m?todo da fundi??o, apesar disso, a passividade das infraestruturas n?o foi influenciada pela t?cnica de fabrica??o e material utilizado. O ajuste horizontal obtido pelas infraestruturas fabricadas por CAD/CAM n?o foi superior ?quelas fabricadas por fundi??o. Uma menor variabilidade no ajuste vertical e na passividade foi observada quando infraestruturas foram fabricadas por tecnologia CAD/CAM
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Tambra, Tussavir Rafique. "In-vitro wear of enamel opposing yttria-stabilized-partially-tetragonal-zirconia (YPSZ) core material and porcelains specifically designed for use with all-ceramic restorations a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 2002. http://catalog.hathitrust.org/api/volumes/oclc/67878284.html.
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Abed, Hassan Mahmoud. "Studies on the Procera all-ceramic porcelain crown a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 2000. http://catalog.hathitrust.org/api/volumes/oclc/68896420.html.
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Al, Amri Mohammed Dhaifallah. "In-vitro wear of enamel opposing titanium porcelain a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 2004. http://catalog.hathitrust.org/api/volumes/oclc/68962642.html.
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Kumchai, Hattanas. "Dental zirconia: in-vitro comparison and outcome of methods for veneering, glazing, and chipping repairs." Thesis, 2016. https://hdl.handle.net/2144/18313.
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OBJECTIVE: The purpose of this study is to evaluate the experimental properties of zirconia-based ceramics.
METHODS: Zirconia bars were veneered to 2mm total thickness. Veneering-method groups included: 1.Hand-layered feldsparthic porcelain (VM=VitaVM9,Vident) and fluorapatite glass-ceramic (CR=IPSe.maxCeram,IvoclarVivadent); 2.Pressed feldspathic porcelain (PM=VitaPM9,Vident) and fluorapatite glass-ceramic (ZP=IPSe.maxZirPress,IvoclarVivadent); 3.CAD/CAM milled feldspathic ceramic (TF=VitablocsTriluxeForte,Vident) and lithium-disilicate glass-ceramic (CAD=IPSe.maxCAD,IvoclarVivadent). CAD/CAM veneers were either cemented with resin cements (P=Panavia21,KurarayDental), (R=RelyXUltimate,3M ESPE), (M=MultilinkAutomix,IvoclarVivadent) or fused with fusion glass-ceramic (C=CrystalConnect,IvoclarVivadent). A Three-point-bending test was performed. For group VM,PM,TF-M,TF-C,CAD-M,CAD-C, ten more bars were prepared and aged with cyclic loading and thermocycling before testing.
Zirconia bars (PrettauZirconia,Zirkonzahn;inCorisTZI,Sirona;ZirluxFC,PentronCeramics) specimens were prepared and polished. The specimens were divided into 3 groups: control, self-glaze fired, and glazed groups. A Three-point bending test was performed.
Veneered zirconia crowns were made. Feldspathic porcelain was applied to zirconia coping. Bevel cut on porcelain was made to simulate porcelain chipping. The crowns were then divided into 4 different groups according to repair materials including: 1.Conventional-resin composite (TetricEvoCeram,IvoclarVivadent) 2.Flowable-resin composite (G-aenialUniversalFlo,GCamerica) 3.Cemented CAD/CAM milled feldspathic ceramic (VitaTriluxForte,Vident) 4.Cemented CAD/CAM milled lithium-disilicate glass-ceramic (IPSe.maxCAD,IvoclarVivadent). Each crown underwent thermocycling. The test was performed by loading force on the center of repaired part to record load-to-failure.
RESULTS: There were significant differences in the failure loads of non-aged bilayered veneer-zirconia bars. Aging experiment revealed a significant difference in failure load between non-aged and aged bars in groups VM and PM, but not in the groups with CAD/CAM milled veneers.
There was significant influence of surface treatments on flexural strength of zirconia specimens. Post-hoc test showed that glazed group had significant lower flexural strength than other groups.
Crowns repaired with CAD/CAM ceramics showed significant higher failure load than resin composite. Repairing with lithium-disilicate glass ceramic yielded the highest load-to-failure of the specimens.
CONCLUSIONS:
- Veneer materials, veneering methods, and cement materials have a significant effect on the failure load of bilayered veneer- zirconia. CAD/CAM veneer-zirconia is not susceptible to aging performed in this study.
- Glazing decreased the flexural strength of high translucent zirconia.
- Veneered zirconia crowns repaired with CAD/CAM ceramic materials have significantly higher load-to-failure than veneered crowns repaired with resin composite.2018-09-28T00:00:00Z
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El-Ebrashi, Sameh Kamal. "The effect of coping/die fit of procera aluminum oxide copings cemented with different cements a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 1998. http://catalog.hathitrust.org/api/volumes/oclc/68800579.html.
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Tselios, Nikolaos. "The effect of hydration on the strength of all ceramic porcelain crowns a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 2003. http://catalog.hathitrust.org/api/volumes/oclc/68962650.html.
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Kim, Ih Hoon. "The effect of ion exchange on the diametral strength of porcelain a dissertation submitted in partial fulfillment ... Master of Science in Prosthodontics ... /." 1991. http://catalog.hathitrust.org/api/volumes/oclc/68793522.html.
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Al-Reyahi, Maha. "The precision of fit of the Procera all-ceramic coping of 0.4 mm thickness a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 2003. http://catalog.hathitrust.org/api/volumes/oclc/68962490.html.
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Chen, Yue Vaisman Monica. "Flexural strength of AllCeram veneering porcelain and aluminum oxide measured by mechanical testing a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 2001. http://catalog.hathitrust.org/api/volumes/oclc/68944134.html.
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Brizgys-Miskinis, Stephanie. "Effect of varying coping thickness on load to fracture strength of aluminum oxide copings a thesis submitted in partial fulfillment ... for the degree of Master of Science in Prosthodontics ... /." 2003. http://catalog.hathitrust.org/api/volumes/oclc/68945278.html.
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Aleman, Marjorie. "Effect of Al [subscript 2] O [subscript 2] core on the polymerization of a resin cement a thesis submitted in partial fulfillment ... for the degree of Master of Science in Restorative Dentistry Master of Science in Prosthodontics ... /." 2003. http://catalog.hathitrust.org/api/volumes/oclc/68962505.html.
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Neto, Brenda Janeth Gomes. "Reabilitação protética unitária com utilização do sistema CAD-CAM CEREC : versão Chairside." Master's thesis, 2012. http://hdl.handle.net/10400.14/15865.
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Introdução: Nas últimas duas décadas, tem-se verificado um grande desenvolvimento da tecnologia de desenho e maquinação assistidas por computador (CAD-CAM) aplicada à Medicina Dentária, sobretudo na área da Prostodontia Fixa. Entre os sistemas existentes no mercado, o sistema CEREC® é o mais antigo e mais implementado, apresentando duas versões: uma de utilização em consultório (chairside) e outra de utilização em laboratório. A primeira tem como principal vantagem executar uma restauração unitária fixa (parcial ou total) em cerâmica dentária, no consultório dentário, logo após a execução da preparação dentária, contribuindo para a diminuição do tempo de tratamento. Nesta dissertação fazemos uma revisão bibliográfica dedicada à tecnologia CAD-CAM, e apresentamos um caso clínico da consulta de Prostodontia Fixa da Universidade Católica Portuguesa. Caso Clínico: Paciente do sexo feminino, com pouca disponibilidade para se dirigir à Clinica Dentária Universitária da UCP, e com discromia dentária do dente 21. Após o registo dos elementos de diagnóstico, foi estabelecido um plano de tratamento que passou pela realização de uma coroa total em cerâmica feldspática, utilizando o sistema CEREC®- versão chairside. Discussão: O comportamento óptico de uma cerâmica feldspática é determinado por: combinação da cor estrutural do dente subjacente, espessura da cerâmica e cor do cimento utilizado. O resultado obtido não foi o desejado, face à cor final da restauração depois de cimentada (nível B). Neste caso clínico, utilizou-se um cimento adesivo auto-condicionante, o Multilink Automix®, de cor transparente (material disponível na Clínica Dentária Universitária da UCP). O dente encontrava-se endodonciado e com descoloração da dentina, assim, teria sido mais indicado a utilização de um “branco opaco”, de forma a garantir uma maior opacidade sobre o coto dentinário. Contudo, relativamente à gestão da consulta, à utilização desta tecnologia CAD-CAM e ao resultado da restauração (adaptação marginal, forma anatómica e textura), o trabalho desenvolvido foi satisfatório (nível A) e a paciente ficou agradada com o resultado obtido. Conclusão: O sistema CEREC®-versão chairside permite, em apenas uma consulta, a realização de restaurações de cerâmica feldspática e implica um conhecimento profundo dos materiais restauradores e dos cimentos que devem ser utilizados em cada situação clínicaIntroduction: In the last two decades, there has been a great development in design technology and computer-aided machining (CAD-CAM) applied to dentistry, particularly in the area of Fixed Prosthodontics. Among the systems on the market, the CEREC® system is the oldest and most implemented and has two versions: one for use within surgery (chairside) and another for use within the dental laboratory. The main advantage of the first version is the possibility to perform a single-unit fixed restoration (partial or total) using dental ceramic within surgery, shortly after the execution of the tooth preparation, contributing to the reduction of treatment time. In this thesis we review literature dedicated to CAD-CAM technology, and we present a clinical case of a Fixed Prosthodontics consultation of the Catholic University of Portugal. Case Study: Female patient, with little willingness to attend the University Dental Clinic of the UCP, and with dyschromia on the tooth 21. After registration of the diagnostic elements, a treatment plan was established in which a full feldspathic ceramic crown was performed using CEREC® system – chairside version. Discussion: The optical behaviour of a feldspathic ceramic is determined by: an association of the underlying tooth structural color, ceramic thickness and color of the cement used. The result obtained was not the desired because of the final color of the restoration after cementation (level B). In this case study, we used self-etching adhesive cement, Multilink Automix® with transparent color (material available at the University Dental Clinic of the UCP). The tooth had an endodontic treatment present and had discoloration of the dentine so it would have been more appropriate the use of an "opaque white", with the aim of creating a greater opacity over the stump. However, regarding the management of the consultation, the use of CAD-CAM technology and the end result of the restoration (marginal adaptation, anatomical shape and texture), the work was satisfactory (level A) and the patient was pleased with the result obtained. Conclusion: The CEREC® system – chairside version allows for feldspathic ceramic restorations to be made in a single consultation and requires a thorough knowledge of the restorative materials and cements to be used in each clinical situation.
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Falcao, Felipe A. "Torque required to loosen surface treated abutment screws before and after cyclic loading a thesis submitted in partial fulfillment ... for the degree of Master of Science in Restorative Dentistry ... /." 2001. http://catalog.hathitrust.org/api/volumes/oclc/68962370.html.
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Boldaji, Abdollah. "Clinical evaluation of facet materials in fixed prosthodontics." Doctoral thesis, 2006. http://www.nusl.cz/ntk/nusl-268908.
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MUDr. BOLDAJI, Abdollah The author in his PhD thesis deals with the assessment of long-term stability of commonly used bevel crown. The work deals with the changes in color, shape, surface integrity, marginal adaptation and the state of the surrounding tissues to determine the ideal facet material.
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Winnett, Brenton Paul Lauder Coverdale. "The Role of NSAIDs in Impaired Osseointegration in Dental Implant Prosthodontics." Thesis, 2013. http://hdl.handle.net/1807/43335.
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Objective: To appraise whether adverse events following oral implant placement may be associated with peri-operative use of non-steroidal anti-inflammatory drugs (NSAIDs). Methods: All patients with recorded implant failures between 1979 and 2012 in the Implant Prosthodontics Unit were contacted to solicit additional information about potential peri-operative use of NSAIDs. Results: From a total of 168 patients with 292 implant failures between 1979 and 2012, 122 consented to participate and had intact records. Just over half (56.6%) reported no peri-operative NSAID usage. However, compared to patients who did not use peri-operative NSAIDs, four times as many had complicated medical histories and twice as many patients taking NSAIDs suffered multiple implant failures. Conclusions: Patients with a variety of systemic diseases may be adversely affected by the inhibitory effect of NSAIDs on bone healing. Further prospective clinical studies are warranted to clarify this potential causative relationship in humans.
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Suri, Sagun. "Dental Implant Outcomes in Patients with Osteoporosis: A Matched Cohort Study." Thesis, 2011. http://hdl.handle.net/1807/29631.
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This study evaluated differences in dental implant outcomes in patients with osteoporosis and their matched controls. Twenty-four patients, who received dental implants at the University of Toronto, were 60+ yrs and had osteoporosis at the time of implant placement, and their controls matched for age, sex and implant related features were examined clinically and radiographically. Clinical and demographic variables recorded at implant placement and follow-up examination, were analyzed. Implant survival rates of 95.1% and 100%, and success rates of 91.4% and 100% were noted in the osteoporosis and control samples respectively. All failures in the osteoporosis sample occurred in the maxilla of a single subject, raising suspicion that these were related to individual problems specific to this subject. Due to the paucity of adverse outcomes and with all the implant failures having occurred in one subject, no relationship of adverse outcomes with clinical and demographic variables could be analyzed.
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Pillay, Thirusha. "The outsourcing of dental prostheses in Gauteng." Thesis, 2013. http://hdl.handle.net/10321/811.
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Dissertation submitted in full compliance with the requirements of the
degree of Master of Technology: Dental Technology, Durban University of Technology, 2012.This study examined the perceptions of South African dental laboratory owners, dental technicians and dentists so as to understand their opinions and experiences regarding the outsourcing of dental prostheses in the industry. The study explored the legislative position of the South African Dental Technicians Council (SADTC). In addition, the study sought the Dental Technicians Association of South Africa (DENTASA) opinion regarding legislation and outsourcing practices in the dental laboratory industry. This is a post-positivist qualitative study conducted in the interpretive paradigm. The study was conducted in Gauteng as this province has the greatest concentration of technicians and dentists. Simple random sampling was used to select participants for individual semi-structured interviews. Interviews were conducted with three different groups of participants – laboratory owners, technicians and dentists. In addition, a representative of the SADTC and DENTASA, respectively, was interviewed. The data collected from interviews was analysed using thematic content analysis. Findings generated from the study revealed that where dental laboratory services are outsourced, no formal contractual relationship exists between parties. Contracts are verbal. The study concluded that the dental technology industry does not operate within clearly defined legal frameworks when outsourcing. It was established that offshore outsourcing occurs infrequently, therefore having minimal impact on the industry and labour market. Technicians interviewed failed to see the potential negative influence that enhanced outsourcing volumes could have on the labour market. The study established that domestic outsourcing is widely practised and dental laboratories receive significant quantities of imported work. The study briefly considered medical device legislation as the South African dental technician industry is reported to be required to comply with the International Standard of Operation (ISO 13485) which will legislate medical device legislation. Dentists stated, confirming a widely held dental technology industry belief that they did not believe that they were sufficiently qualified to carry out laboratory procedures. The study revealed that technicians regularly consult with patients with the consent of dentists. This is, currently, an illegal practice. Disclosure of who is doing the laboratory work does not always occur. It was established that economic consideration was not a driver when respondents considered outsourcing offshore. Quality was considered a more important factor than price. The study found that that no legislation exists in South Africa that regulates the dental laboratory materials used. Therefore, the possibility of inferior material filtering the South African market is real and the need for a regulatory body is indicated. Technicians felt that there is no need to regulate outsourcing in South Africa. Dentists, on the other hand, were ambivalent. In conclusion, it is postulated that dental technology industry is in a developmental stage and there is a need for the industry to understand itself better. This research showed that the dental technology industry has an inexperienced understanding of business practices. A greater emphasis on producing a well rounded dental technician with the knowledge and understanding of general business concepts and practices which include legislation, regulations and ethics related to the industry is indicated.
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Alsayed, Hussain D. "Effect of interim fixed prosthodontics materials and flowable composite resins on polymerization of polyvinyl siloxane impressions." Thesis, 2017. https://doi.org/10.7912/C2QH2W.
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Lefebvre, Carol A. "In-vivo color stability of selected composite resins a thesis submitted in partial fulfillment ... denture prosthodontics /." 1986. http://books.google.com/books?id=CG09AAAAMAAJ.
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Han, Jung-Suk. "Effects of an air-powder abrasive system on smooth titanium surface a pilot study : a theses submitted in partial fulfillment ... prosthodontics ... /." 1989. http://catalog.hathitrust.org/api/volumes/oclc/68788548.html.
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Cibirka, Roman M. "Determining the force absorption quotient for restorative materials used in implant occlusal surfaces a thesis submitted in partial fulfillment ... in prosthodontics ... /." 1990. http://catalog.hathitrust.org/api/volumes/oclc/68788270.html.
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