O objetivo deste estudo in vitro foi avaliar a força de adesão de sistemas adesivos sobre superfícies de esmalte bovino submetidas previamente, ou não, a tratamento clareador com gel a base de peróxido de carbamida (Opalescence PF), em diferentes concentrações (10%, 15% e 20%), através de ensaio mecânico de microcisalhamento. As superfícies de esmalte vestibular de 56 incisivos bovinos íntegros foram aplainadas e divididas em 14 grupos. G. 01: foram confeccionados cilindros com sistema adesivo Single Bond (SB) e resina composta (RC) Z-250 (controle); G. 02: foram confeccionados cilindros com sistema adesivo Clearfil SE Bond (CF) e RC Z-250 (controle); G. 03: clareamento com Opalescence PF (Op) 10% e cilindros confeccionados com SB e RC, 12 horas após o término do tratamento clareador; G. 04: clareamento com Op 15% e cilindros confeccionados conforme descrito para 03; G. 05: clareamento com Op 20% e cilindros confeccionados conforme descrito para 03; G. 06: clareamento com Op 10% e cilindros confeccionados com CF e RC, 12 horas após o término do tratamento clareador; G. 07: clareamento com Op 15% e cilindros confeccionados conforme descrito para 06; G. 08: clareamento com Op 20% e cilindros confeccionados conforme descrito para 06; G. 09: clareamento com Op 10% e cilindros confeccionados com sistema adesivo SB e RC, 01 semana após o término do tratamento clareador; G. 10: clareamento com Op 15% e cilindros confeccionados conforme descrito para 09; G. 11: clareamento com Op 20% e cilindros confeccionados conforme descrito para 09; G. 12: clareamento com Op 10% e cilindros confeccionados com CF e RC, 01 semana após o término do tratamento clareador; G. 13: clareamento com Op 15% e cilindros confeccionados conforme descrito para 12; G. 14: clareamento com Op 20% e cilindros confeccionados conforme descrito para 12. As amostras dos grupos 03 a 14 foram clareadas durante 02 semanas (08 horas/dia). Os resultados obtidos mostraram que as médias de adesão dos grupos 03, 04, 05 e 06, 07, 08 foram estatisticamente menores (p<0,05) que as médias obtidas para seus respectivos grupos controle (01 ou 02). Para o sistema adesivo monocomponente, as médias de adesão dos cilindros confeccionados 01 semana após o término do tratamento clareador, independente da concentração do peróxido de carbamida, foram estatisticamente semelhantes (p>0,05) às do respectivo grupo controle e tenderam a ser maiores que os valores de adesão obtidos nos cilindros confeccionados 12 horas após o término do clareamento, porém, em valores absolutos, a recuperação dos valores de adesão não foi completa (p<0,05). Para o sistema autocondicionante, as médias de adesão dos cilindros confeccionados 01 semana após o término do tratamento clareador foram estatisticamente semelhantes às do respectivo grupo controle (p>0,05), independente da concentração do agente clareador, havendo recuperação dos baixos valores de adesão obtidos quando os cilindros foram confeccionados 12 horas após o término do tratamento clareador. / The aim of this in vitro study was to evaluate the microshear bond strength of adhesive systems to bovine enamel surfaces previously submitted, or not, to bleach treatment with carbamide peroxide gel (Opalescence PF), in different concentrations (10%, 15% and 20%). The flat enamel surfaces of 56 bovine incisors were randomly divided in 14 groups. G. 01: cylinders made with Single Bond adhesive system (SB) and Z-250 composite (C) (control); G. 02: cylinders made with Clearfil SE Bond (CF) adhesive system and Z-250 (C) (control); G. 03: bleaching treatment with Opalescence PF (Op) 10% and cylinders made with SB and C, 12 hours after finishing the bleach regimen; G. 04: bleaching treatment with Op 15% and cylinders made according to 03; G. 05: bleaching treatment with Op 20% and cylinders made according to 03; G. 06: bleaching treatment with Op 10% and cylinders made with CF and C, 12 hours after finishing the bleach regimen; G. 07: bleaching treatment with Op 15% and cylinders made according to 06; G. 08: bleaching treatment with Op 20% and cylinders made according to 06; G. 09: bleaching treatment with Op 10% and cylinders made with SB and C, 01 week after finishing the bleach regimen; G. 10: bleaching treatment with Op 15% and cylinders made according to 09; G. 11: bleaching treatment with Op 20% and cylinders made according to 09; G. 12: bleaching treatment with Op 10% and cylinders made with CF and C, 01 week after finishing the bleach regimen; G. 13: bleaching treatment with Op 15% and cylinders made according to 12; G. 14: bleaching treatment with Op 20% and cylinders made according to 12. The specimens from groups 03 to 14 were bleached during 02 weeks, 08 hours/day, placed in individualized trays. During the remaining daily 16 hours, teeth were immersed in artificial saliva. Before microshear tests, the samples were stored in distilled water at 37 o C, for 24 hours. The results showed that bond strengths of groups 03, 04, 05 and 06, 07, 08 were statistically lower (p<0,05) when compared with their respective control group (01 or 02). For the all-etch adhesive system, the bond strength of the cylinders placed 01 week after the end of bleaching regimen, independent of the carbamide peroxide gel concentration, showed no significant differences (p>0,05) when compared with their respective control group and tended to be higher when compared with groups where adhesion were made 12 hours after the end of the bleaching treatment, with the same adhesive system. However, in absolute terms, the recuperation of the bond strength were incomplete (p<0,05). For the self-etch adhesive system, the bond strength of the cylinders placed 01 week after the end of bleaching regimen, independent of the carbamide peroxide gel concentration, showed no significant differences (p>0,05) when compared with their respective control group, recovering the bond strength values obtained when cylinders were made 12 hours after the end of the bleach regimen.

Made available in DSpace on 2017-07-10T14:57:28Z (GMT). No. of bitstreams: 1 dissertacao marcal final_ apos defesaIpdf.pdf: 991526 bytes, checksum: 320d4a641b2062d25e7dffaef6de5e29 (MD5) Previous issue date: 2015-02-24 / The aim of this study was evaluate the influence of three techniques of photoactivation, in the sorption (SO) and solubility (SL) of three composite resins Filtek Z350 XT, Tetric N-Ceram and IPS Empress Direct. It was prepared 90 specimen (CP) of 8mm of diameter and 1mm of thickness and divided in 9 groups (n=10). The CP were photoactivated by a LED Bluephase device following these techniques: Convencional (CONV); Soft-Start (SS) and Pulse Delay (PA). They were then placed in a desiccator containing silica gel at 37°C and weighed daily until obtainment of a constant mass m1. Then, they were immerse in deionized water for seven days and weighed (m2). The reconditioning of the CP were accomplished following the procedure of m1 until the obtainment of a constant mass (m3). The values of SO and SL was calculated according to ISO 4049 and submitted to the ANOVA test (two-way) followed by the pos hoc of Turkey, p<0.05. There were no significant statistical differences in SO and SL when compared to the photoactivation techniques for all tested resins. In the analysis of SL, no significant statistical differences between the materials and the photoactivation techniques were observed. As for the composite resin Filtek Z350 XT, statistically higher results to other resins was evaluated. It was concluded that the different forms of photoactivation did not influence in the SO and SL of the tested composite resins. / O objetivo deste estudo foi avaliar a influência de três técnicas de fotoativação, na sorção (SO) e solubilidade (SL) de três resinas compostas Filtek Z350 XT ,Tetric N-Ceram e IPS Empress Direct. Foram confeccionados 90 corpos-de-prova (CP) de 8 mm de diâmetro e 1 mm de espessura e divididos em 9 grupos (n=10). Os CP foram fotoativados com o aparelho de luz LED Bluephase seguindo as seguintes técnicas: Convencional (CONV); Soft-Start (SS) e Pulso Atrasado (PA). Em seguida, foram colocados em um dessecador com sílica gel a 37ºC e pesados diariamente até obtenção de uma massa constante m1. Em seguida, foram imersos em água deionizada por sete dias e pesados novamente (m2). O recondicionamento dos CP foi realizado seguindo o procedimento da m1, até obtenção de uma massa constante (m3). Os valores de SO e SL foram calculados de acordo com a ISO 4049 e submetidos ao teste de ANOVA (two-way), seguido do post hoc de Tukey, p<0,05. Não houve diferenças estatisticamente significantes para SO e SL quando as técnicas de fotoativação foram comparadas, para todas as resinas estudadas. Na análise da SL não foram observadas diferenças estatisticamente significativas entre os materiais e técnicas de fotoativação. Já para SO, a resina composta Filtek Z350 XT apresentou resultados estatisticamente mais elevados às demais resinas compostas avaliadas. Foi possível concluir que as diferentes formas de fotoativação não influenciaram na SO e SL das resinas compostas testadas.

O presente estudo teve como objetivo avaliar o desempenho de quatro resinas bulk fill (Filtek Bulk Fill (FBF), Opus Bulk Fill (OBF), Sonicfill (SF) e Tetric N-Ceram Bulk Fill (TNBF)) e uma resina convencional (Charisma Diamond (CD)) quanto às seguintes propriedades: resistência à flexão (RF), módulo de elasticidade (ME) e dureza Knoop (KHN) em função da profundidade e após a realização de um envelhecimento acelerado. Corpos de prova em formato de barra foram confeccionados simultaneamente em diferentes profundidades (1, 2, 3, 4 e 5 mm) para realização dos testes de resistência à flexão (n=10), módulo de elasticidade (n=10) e dureza Knoop (n=3). Os testes foram realizados em dois momentos, previamente e após a realização de um envelhecimento acelerado, que consistiu na realização de uma termociclagem com banhos alternados em água a 5 e 55ºC, com 1 min de imersão em cada, por 2000 ciclos. Os resultados para o teste de RF e ME mostraram que os valores para estas duas propriedades diminuíram em função da profundidade e após a realização da termociclagem para todas as resinas estudadas. Apenas a resina TNBF não apresentou diferença estatística para valores de ME após o envelhecimento acelerado. Quanto à dureza, os valores também diminuíram em função da profundidade, porém aumentaram após a realização do envelhecimento acelerado. Apenas a resina SF não apresentou diferença estatística entre os valores de dureza antes e após o envelhecimento. A resina convencional CD após a ciclagem térmica foi a única que apresentou relação base/topo (2 mm) acima de 80%. Nenhuma das resinas do tipo bulk fill apresentou uma relação base/topo acima de 80% para a dureza quando avaliadas na espessura máxima recomendada. Com base nos resultados obtidos, pode-se afirmar que, quando fotoativadas na espessura máxima recomendada, apenas a resina convencional CD apresentou resultados condizentes com a homogeneidade esperada em todas as condições deste estudo. Entretanto, para as resinas do tipo bulk fill, pode-se observar que as propriedades estudadas, de modo geral, sofreram uma diminuição significativa em função da profundidade. Para o envelhecimento, a dureza, diferentemente dos outros parâmetros, mostrou uma tendência de aumento. / The purpose of this study was to evaluate the performance of four bulk fill resins (Filtek Bulk Fill (FBF), Opus Bulk Fill (OBF), Sonicfill (SF) and Tetric N-Ceram Bulk Fill (TNBF)) and a conventional resin (Charisma Diamond (CD)) for the following properties: flexural strength (FS), flexural modulus (FM) and Knoop hardness (KHN) as a function of depth and after accelerated aging. Specimens were made simultaneously with different depths (1, 2, 3, 4 and 5 mm) for flexural strength tests (n = 10), flexural modulus (n = 10) and Knoop hardness (n = 3). The tests were carried out in two moments, before and after the accelerated aging process, which consisted of thermocycling with alternating baths in water at 5 and 55ºC, with 1 min immersion in each, for 2000 cycles. The results for the FS and FM tests showed that the values for these two properties decreased as a function of depth and after the thermocycling for all the studied resins. Only TNBF resin showed no statistical significant differences in FM values after accelerated aging. For the hardness test, values also decreased as a function of depth, but increased after accelerated aging. SF resin was the only one that showed no statistical significant differences between hardness values before and after aging. CD, after thermal cycling, was the exclusive resin to show a bottom/top ratio above 80%. None of the bulk fill resins had a bottom/top ratio above 80% for hardness when evaluated at the maximum recommended thickness. Based on the results obtained, it can be stated that, when photoactivated at the maximum recommended thickness, only the conventional resin CD presented results consistent with the expected homogeneity in all the conditions of this study. However, for bulk fill resins, it can be observed that the studied properties, in general, suffered a significant decrease as a function of depth. For aging, the hardness, unlike the other parameters, showed a tendency to increase.

Avaliou-se in vitro a microinfiltração marginal em restaurações classe II, realizadas com o cimento de ionômero de vidro modificado por resina Vitremer, a resina composta "semicondensável" Ariston pHc e a resina composta "condensável" P-60, com o propósito de verificar a influência da ciclagem térmica para estes materiais, como também dois métodos de análise da penetração do corante. Para tanto, 60 pré-molares, receberam cavidades classe II proximais, com a parede cervical localizada 1mm abaixo da junção cemento-esmalte. Os espécimes foram divididos em 3 grupos de 20 dentes cada. O grupo I foi restaurado com Vitremer, o grupo II com Ariston pHc e o grupo III com P-60. Após a restauração, os espécimes foram acondicionados em recipientes plásticos com água deionizada por 24 horas a 37°C. Decorrido esse período as restaurações receberam acabamento e polimento. Enquanto metade de cada grupo sofreu processo de termociclagem com 500 ciclos nas temperaturas de 5°C e 55°C, em banhos de 15 segundos cada, a outra metade permaneceu acondicionada em recipientes plásticos com água deionizada a 37°C. Após o período de teste, todos os espécimes foram imersos em solução de fucsina básica a 0,5% por 24 horas a 37°C, sendo em seguida lavados abundantemente em água corrente durante 24 horas. Para análise da microinfiltração os dentes foram incluídos em resina plástica autopolimerizável e seccionados no sentido mesio-distal, sofrendo uma média de quatro cortes cada dente. Para cada corte, foram obtidas duas imagens para serem analisadas através de um software denominado Imagetools. Os resultados foram avaliados através do teste estatístico de Análise de Variância a dois critérios (2-way ANOVA) e o teste de Tukey para comparações múltiplas entre os materiais, em nível de significância de 5%. Os resultados demonstraram que todos os grupos testados apresentaram microinfiltração marginal, sendo que o cimento de ionômero de vidro modificado por resina Vitremer apresentou resultados sempre melhores, vindo a seguir a resina composta "condensável" P-60 e por último a resina composta "semicondensável" Ariston pHc. Não houve diferença estatisticamente significante no uso ou não da termociclagem para estes materiais. Quando avaliou-se os métodos de análise de penetração do corante, o método através da máxima infiltração parece ser o melhor para detectar a extensão da microinfiltração. / It was the purpose of this work to assess in vitro marginal microleakage in class II restorations, made with a glass ionomer cement modified through resin Vitremer, "semicondensable" composite resin Ariston pHc and "condensable" composite resin P-60, pretending to verify the influence of thermocycling upon these materials, as well as of the performance of two methods for dye penetration analysis. Thus, 60 premolars received proximal class II cavities, with cervical wall situated above cement/enamel junction. The specimens were divided in three groups with 20 teeth each. Group I was restored with Vitremer, Group II with Ariston pHc and Group III with P-60. Following restoration, specimens were stored in plastic containers with deionized water for 24 hours under 37ºC. After this time period restorations were finished and polished. While half the group suffered a thermocycling process with 500 cycles under temperatures of 5ºC and 55ºC, in baths of 15 seconds each, the other half remained stored in plastic containers with deionized water under 37ºC. After testing period, all specimens have been immersed into a 0.5% basic fuchsin solution for 24 hours under 37ºC, being next thoroughly washed in running water for 24 hours. For microleakage analysis, teeth were embedded in autopolimerizing plastic resin and sectioned in a mesiodistal sense, each tooth suffering a mean of four sections. For each section two images were obtained for the analysis through a software called Imagetools. Results have been examined through a Variance Analysis statistical test through two criteria (2-way ANOVA) and Tukey test for multiple comparisons between materials, at a 5% significance level. Results showed that all tested groups presented marginal microleakage, glass ionomer cement modified with resin Vitremer always presenting the best results, followed by "condensable" composite resin P-60 and coming last "semicondensable" composite resin Ariston pHc. There was no statiscally significant difference between the use and non-use of thermocycling for these materials. When methods for dye penetration analyses were assessed the method of maximum leakage seems to be the best one for detecting microleakage extension.

O objetivo deste estudo in vitro foi avaliar a força de adesão de sistemas adesivos sobre superfícies de esmalte bovino submetidas previamente, ou não, a tratamento clareador com gel a base de peróxido de carbamida (Opalescence PF), em diferentes concentrações (10%, 15% e 20%), através de ensaio mecânico de microcisalhamento. As superfícies de esmalte vestibular de 56 incisivos bovinos íntegros foram aplainadas e divididas em 14 grupos. G. 01: foram confeccionados cilindros com sistema adesivo Single Bond (SB) e resina composta (RC) Z-250 (controle); G. 02: foram confeccionados cilindros com sistema adesivo Clearfil SE Bond (CF) e RC Z-250 (controle); G. 03: clareamento com Opalescence PF (Op) 10% e cilindros confeccionados com SB e RC, 12 horas após o término do tratamento clareador; G. 04: clareamento com Op 15% e cilindros confeccionados conforme descrito para 03; G. 05: clareamento com Op 20% e cilindros confeccionados conforme descrito para 03; G. 06: clareamento com Op 10% e cilindros confeccionados com CF e RC, 12 horas após o término do tratamento clareador; G. 07: clareamento com Op 15% e cilindros confeccionados conforme descrito para 06; G. 08: clareamento com Op 20% e cilindros confeccionados conforme descrito para 06; G. 09: clareamento com Op 10% e cilindros confeccionados com sistema adesivo SB e RC, 01 semana após o término do tratamento clareador; G. 10: clareamento com Op 15% e cilindros confeccionados conforme descrito para 09; G. 11: clareamento com Op 20% e cilindros confeccionados conforme descrito para 09; G. 12: clareamento com Op 10% e cilindros confeccionados com CF e RC, 01 semana após o término do tratamento clareador; G. 13: clareamento com Op 15% e cilindros confeccionados conforme descrito para 12; G. 14: clareamento com Op 20% e cilindros confeccionados conforme descrito para 12. As amostras dos grupos 03 a 14 foram clareadas durante 02 semanas (08 horas/dia). Os resultados obtidos mostraram que as médias de adesão dos grupos 03, 04, 05 e 06, 07, 08 foram estatisticamente menores (p<0,05) que as médias obtidas para seus respectivos grupos controle (01 ou 02). Para o sistema adesivo monocomponente, as médias de adesão dos cilindros confeccionados 01 semana após o término do tratamento clareador, independente da concentração do peróxido de carbamida, foram estatisticamente semelhantes (p>0,05) às do respectivo grupo controle e tenderam a ser maiores que os valores de adesão obtidos nos cilindros confeccionados 12 horas após o término do clareamento, porém, em valores absolutos, a recuperação dos valores de adesão não foi completa (p<0,05). Para o sistema autocondicionante, as médias de adesão dos cilindros confeccionados 01 semana após o término do tratamento clareador foram estatisticamente semelhantes às do respectivo grupo controle (p>0,05), independente da concentração do agente clareador, havendo recuperação dos baixos valores de adesão obtidos quando os cilindros foram confeccionados 12 horas após o término do tratamento clareador. / The aim of this in vitro study was to evaluate the microshear bond strength of adhesive systems to bovine enamel surfaces previously submitted, or not, to bleach treatment with carbamide peroxide gel (Opalescence PF), in different concentrations (10%, 15% and 20%). The flat enamel surfaces of 56 bovine incisors were randomly divided in 14 groups. G. 01: cylinders made with Single Bond adhesive system (SB) and Z-250 composite (C) (control); G. 02: cylinders made with Clearfil SE Bond (CF) adhesive system and Z-250 (C) (control); G. 03: bleaching treatment with Opalescence PF (Op) 10% and cylinders made with SB and C, 12 hours after finishing the bleach regimen; G. 04: bleaching treatment with Op 15% and cylinders made according to 03; G. 05: bleaching treatment with Op 20% and cylinders made according to 03; G. 06: bleaching treatment with Op 10% and cylinders made with CF and C, 12 hours after finishing the bleach regimen; G. 07: bleaching treatment with Op 15% and cylinders made according to 06; G. 08: bleaching treatment with Op 20% and cylinders made according to 06; G. 09: bleaching treatment with Op 10% and cylinders made with SB and C, 01 week after finishing the bleach regimen; G. 10: bleaching treatment with Op 15% and cylinders made according to 09; G. 11: bleaching treatment with Op 20% and cylinders made according to 09; G. 12: bleaching treatment with Op 10% and cylinders made with CF and C, 01 week after finishing the bleach regimen; G. 13: bleaching treatment with Op 15% and cylinders made according to 12; G. 14: bleaching treatment with Op 20% and cylinders made according to 12. The specimens from groups 03 to 14 were bleached during 02 weeks, 08 hours/day, placed in individualized trays. During the remaining daily 16 hours, teeth were immersed in artificial saliva. Before microshear tests, the samples were stored in distilled water at 37 o C, for 24 hours. The results showed that bond strengths of groups 03, 04, 05 and 06, 07, 08 were statistically lower (p<0,05) when compared with their respective control group (01 or 02). For the all-etch adhesive system, the bond strength of the cylinders placed 01 week after the end of bleaching regimen, independent of the carbamide peroxide gel concentration, showed no significant differences (p>0,05) when compared with their respective control group and tended to be higher when compared with groups where adhesion were made 12 hours after the end of the bleaching treatment, with the same adhesive system. However, in absolute terms, the recuperation of the bond strength were incomplete (p<0,05). For the self-etch adhesive system, the bond strength of the cylinders placed 01 week after the end of bleaching regimen, independent of the carbamide peroxide gel concentration, showed no significant differences (p>0,05) when compared with their respective control group, recovering the bond strength values obtained when cylinders were made 12 hours after the end of the bleach regimen.

Orientador: César Rogério Pucci / Coorientadora: Alessandra Bühler Borges / Banca: Rebeca Di Nicoló / Banca: Rayssa Ferreira Zanatta / Resumo: O objetivo do estudo foi avaliar a ocorrência da fenda marginal em restaurações de resinas flow, com e sem ciclagem termomecânica. Utilizou-se neste estudo 60 incisivos bovinos. Os preparos cavitários foram padronizados por meio de um dispositivo que proporcionou preparos uniformizados realizados com uma ponta diamantada (3286P-KG Sorensen). O sistema adesivo Single Bond Universal (3M-ESPE) foi aplicado e os compósitos foram utilizados: FILTEK BULK FILL FLOW (3M-ESPE), ADMIRA FUSION FLOW (VOCO) e FILTEK Z350 XT FLOW (3M ESPE). Metade dos espécimes foram submetidos à ciclagem termomecânica. Foi realizada a avaliação da área da fenda marginal por meio da medição no microscópio óptico DISCOVERY V20 (ZEISS). Os valores de média e desvio-padrão de área da fenda marginal (μm²) obtidos nos 6 grupos estudados foram: FBNC = 332,75 ± 214,76; AFNC = 376,20 ± 196,04; FZNC = 861,12 ± 393,68; FBC = 951,68 ± 273,67; AFC = 598,82 ± 392,60; FZC = 1157,59 ± 563,76. O teste ANOVA dois fatores apresentou o valor de p< 0,05 para ambos os fatores, o teste de Tukey a 5% mostrou média e desvio padrão (μm²) para o fator envelhecimento: com ciclagem = 902,70 ± 455,37ª; sem ciclagem = 523,35 ± 345,28ᵇ, e para o fator resina composta mostrou média e desvio padrão (μm²): FZ = 1009,36 ± 466,43ª; FB = 642,21 ± 399,27ªᵇ; AF = 487,51 ± 307,80ᵇ. A ciclagem termomecânica resultou no aumento da área da fenda marginal, a resina AF apresentou resultados superiores em relação á FZ. A resina FB não apresentou difer... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract : The aim of this study was to evaluate the occurrence of marginal gap of different restorations, using different flowable composite, with and without thermo mechanical cycling. 60 incisive bovine tooth were used. The cavity preparations were standardized by means of a device that provided uniform preparations made with a diamond bur (3286P, KG Sorensen, Barueri, SP, Brazil). Universal Single Bond (3M) adhesive system was applied and the composites were applied: FILTEK BULK FILL FLOW (3M), ADMIRA FUSION FLOW (VOCO) e FILTEK Z350 XT FLOW (3M). Half of each group were submitted to thermo cycling. Evaluation of marginal gap were done by optical microscopy DISCOVERY V20 (ZEISS). The mean and standard deviation values of the marginal gap area (μm²) obtained in the 6 groups studied were: FBNC = 332,75 ± 214,76; AFNC = 376,20 ± 196,04; FZNC = 861,12 ± 393,68; FBC = 951,68 ± 273,67; AFC = 598,82 ± 392,60; FZC = 1157,59 ± 563,76. The twoway ANOVA presented p lesser than 0.05 for both factors, the Tukey test at 5% showed mean and standard deviation (μm²) for termo mechanical cycling factor: Cycling = 902,70 ± 455,37ª; No cycling = 523,35 ± 345,28ᵇ and for composite resin factor: FZ = 1009,36 ± 466,43ª; FB = 642,21 ± 399,27ªᵇ; AF = 487,51 ± 307,80ᵇ. The thermomechanical cycling resulted in an increase in the marginal gap area; and the composite AF presented statistically superior results in relation to FZ. The FB composite showed no differences in relation to the other composites / Mestre

Objectives: This retrospective cohort study aimed to assess the survival time and factors associated with survival of anterior composite-resin restoration placed at the University of Iowa, College of Dentistry (UICOD). Methods: Patients at the UICOD who had anterior composite restorations placed between 1995-1997 and could be followed through 2013 were included in this study. Factors included: patient age and gender, tooth type (central or lateral incisor, or canine) and location (maxillary or mandibular), restoration size (1, 2, 3, 4 and more surfaces), provider type (dental student, graduate student, faculty), and clinic (operative, family, or other clinics) where the initial restoration placed. Survival time of a restoration was defined as how long a restoration lasted from the day of placement until the day of subsequent treatment. Subsequent treatment included: restorations, veneer and/or crowns, root canal therapy, and extraction. One restoration per patient was used for the study. Statistical analyses consisted of the Kaplan-Meier analysis and Cox regression (alpha=0.05). Results: Of the 668 subjects (mean±SD age=55±13 years and 60.8% females) who fulfilled the inclusion criteria, the mean±SD survival time of composite resin restoration was 11±7 years and an overall survival rate was 43.3%. Patients' gender, age, tooth location, and clinic type were not significantly associated with the survival time of composite resin restoration. Cox regression model indicated that significant differences in the restoration hazards were found on tooth type (p=0.002), provider type (p=0.003) and restoration sizes (p=0.0072). Central (HR=1.59; CI=1.23-2.07) and lateral (HR=1.36; CI=1.03-1.79) incisors had a significantly higher hazard ratio (HR) than canines, and faculty had significantly lower HR than undergraduate students (HR=0.68, CI=0.55-0.85). Restorations sizes one surface (HR=0.6; CI=0.44-0.81) and two surfaces (HR=0.65; CI=0.48-0.88) had significantly lower HR than four and more surfaces restorations. Conclusion: The mean and median survival time of anterior composite restoration at UICOD was 11 and 13 years, respectively. Tooth type, provider type, and restoration size were significant predictors for the survival time of anterior composite-resin restoration.

<p>Aim and Objectives: To assess the effect of bleaching on the marginal integrity of Class V composite resin restorations. To determine the effect of a 6% hydrogen peroxide over the counter and a 38% hydrogen peroxide in-office vital bleaching treatment products on the microleakage of Class V composite restorations.</p>

Objectives: To compare fracture strength and fatigue resistance of ceramic (ProCAD, Ivoclar-Vivadent)(C) and resin composite (Paradigm MZ100, 3M/ ESPE)(R) crowns made with CEREC-3D. Methods: A prepared ivorine molar tooth was duplicated to produce 40 identical prepared specimens made of epoxy resin (Viade). Twenty (C) crowns and 20 (R) were cemented to their dies using resin cement. Ten of each group were subjected to compressive loading to fracture. The remaining 10 of each group were subjected to mechanical cyclic loading for 500,000 cycles. The survivors were subjected to compressive loading to fracture. Results: No significant difference in mean fracture load was found between the two materials. However, only 30% of the (C) crowns vs. 100% of the (R) crowns survived the cyclic loading test. Conclusions: (R) crowns demonstrated higher fatigue Resistance than (C) crowns in-vitro and might better resist cracking in-vivo.

Objectives: To compare fracture strength and fatigue resistance of ceramic (ProCAD, Ivoclar-Vivadent)(C) and resin composite (Paradigm MZ100, 3M/ ESPE)(R) crowns made with CEREC-3D. Methods: A prepared ivorine molar tooth was duplicated to produce 40 identical prepared specimens made of epoxy resin (Viade). Twenty (C) crowns and 20 (R) were cemented to their dies using resin cement. Ten of each group were subjected to compressive loading to fracture. The remaining 10 of each group were subjected to mechanical cyclic loading for 500,000 cycles. The survivors were subjected to compressive loading to fracture. Results: No significant difference in mean fracture load was found between the two materials. However, only 30% of the (C) crowns vs. 100% of the (R) crowns survived the cyclic loading test. Conclusions: (R) crowns demonstrated higher fatigue Resistance than (C) crowns in-vitro and might better resist cracking in-vivo.