Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T11:43:42Z No. of bitstreams: 2 lilian_capanema_nogueira.pdf: 2184946 bytes, checksum: 6f6169ea092a767b716bac691cf179f3 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T11:44:14Z (GMT) No. of bitstreams: 2 lilian_capanema_nogueira.pdf: 2184946 bytes, checksum: 6f6169ea092a767b716bac691cf179f3 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-22T11:44:31Z (GMT) No. of bitstreams: 2 lilian_capanema_nogueira.pdf: 2184946 bytes, checksum: 6f6169ea092a767b716bac691cf179f3 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Made available in DSpace on 2014-12-22T11:44:31Z (GMT). No. of bitstreams: 2 lilian_capanema_nogueira.pdf: 2184946 bytes, checksum: 6f6169ea092a767b716bac691cf179f3 (MD5) license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) Previous issue date: 2014 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / A ?Restaura??o Biol?gica? ? uma t?cnica que pode oferecer uma excelente biocompatibilidade, desgaste fisiol?gico e mant?m as caracter?sticas est?ticas e funcionais da estrutura do dente tais como brilho de superf?cie, textura, dureza, tamanho, forma, cor e resili?ncia. O objetivo do presente estudo foi comparar pelo ensaio de microtra??o a resist?ncia ? ades?o de restaura??es biol?gicas ap?s cimenta??o no substrato dentin?rio em compara??o as convencionais restaura??es est?ticas cer?micas e analisar suas ?reas de fratura. Foram selecionados vinte e quatro terceiros molares humanos h?gidos, rec?m-extra?dos, que tiveram suas por??es coron?rias seccionadas em dentina e aleatoriamente divididos em dois grupos (n=12), grupo controle (Restaura??es Cer?micas IPS e.max ZirPress) e grupo experimental (Restaura??es Biol?gicas). Para confec??o das restaura??es biol?gicas, discos de dentina foram seccionados com espessura de 2,0 mm cada. Pastilhas de cer?mica foram confeccionadas com as mesmas dimens?es dos discos de dentina. As restaura??es foram cimentadas com cimento resinoso Rely X ARC e ap?s 24 horas submetidos a 10.000 ciclos de termociclagem (5-55?C). Os dentes foram seccionados perpendicularmente ? interface de uni?o, gerando palitos de 1 mm2 e submetidos a ensaio de microtra??o com velocidade de 0,5 mm/min, utilizando uma c?lula de carga de 5Kg. Foi realizada an?lise do padr?o de fratura em lupa estereosc?pica com o aumento de 40x. Esp?cimes representativos foram caracterizados por MEV/EDS para an?lise da morfologia geral e composi??o qu?mica elementar quantitativa dos materiais. Esp?cimes representativos de cada grupo foram submetidas ao protocolo de nanoinfiltra??o com AgNO3 e analisados em MEV. Os dados foram analisados pelo teste t de Student para esp?cimes independentes (p ? 0.05) e do qui-quadrado. N?o foi observada diferen?a estat?stica significativa em rela??o ? resist?ncia ? ades?o. Houve diferen?a significativa (p=0,015) quanto ao tipo de fratura, com 75% de fraturas adesivas para o grupo experimental. As restaura??es biol?gicas apresentaram comportamento semelhante em termos de resist?ncia ? ades?o, quando comparadas ?s restaura??es cer?micas, podendo vir a ser consideradas alternativas para o restabelecimento est?tico-funcional de dentes posteriores. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Odontologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2014. / ABSTRACT ?Biological restoration? offers excellent biocompatibility and maintains the esthetic and functional characteristics of the tooth, such as physiological wear, surface shine, texture, hardness, size, shape, color and resilience. The aim of the present study was to evaluate the bond strength of biological restorations on dentin in comparison to conventional porcelain restorations through a microtraction test and characterize areas of fracture. The crowns of 24 recently extracted sound human third molars were planed to the dentin and randomly divided into a control group (n = 12; porcelain restorations ? IPS e.max ZirPress) and experimental group (n = 12, biological restorations). Biological restorations were made from fragments of the teeth cut to a thickness of 2.0 mm. Porcelain crowns were made with the same dimensions as the biological fragments. All restorations were cemented with Rely X ARC resin and, after 24 hours, submitted to 10,000 thermal cycles (5 to 55 ?C). The teeth were sectioned perpendicularly to the interface of the union for the obtainment of samples measuring 1 mm2, which were submitted to microtraction using the EZ Test - L universal testing machine operating at 0.5 mm/min with a 5 Kg cell load. Standard fracture analysis was performed with a stereomicroscopic magnifying glass (magnification: 40 x). Representative samples were characterized by scanning electron microscopy (SEM) for the analysis of general morphology and the quantitative element composition of the materials. Additional representative samples from each group were submitted to nano-injection with AgNO3 and analyzed using SEM. Data analysis involved the Student?s t-test for independent samples and the chi-squared test (p ? 0.05). No significant difference in bond strength was found, but a significant difference was found regarding the type of fracture (p = 0.015), with an adhesive fracture rate of 75% in the experimental group. Biological restorations demonstrate similar behavior to that found in porcelain restorations with regard to bond strength and constitute a viable option for the reestablishment of function and esthetics on posterior teeth.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-05T00:11:28Z No. of bitstreams: 1 LeticiaVirginiaDeFreitasChaves_DISSERT.pdf: 624609 bytes, checksum: 00e1748d54f2f6578477eb5c68293890 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-16T23:12:07Z (GMT) No. of bitstreams: 1 LeticiaVirginiaDeFreitasChaves_DISSERT.pdf: 624609 bytes, checksum: 00e1748d54f2f6578477eb5c68293890 (MD5) / Made available in DSpace on 2017-10-16T23:12:07Z (GMT). No. of bitstreams: 1 LeticiaVirginiaDeFreitasChaves_DISSERT.pdf: 624609 bytes, checksum: 00e1748d54f2f6578477eb5c68293890 (MD5) Previous issue date: 2017-07-07 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Objetivos: Avaliar a profundidade de polimeriza??o (PP), tens?o de contra??o (TC), resist?ncia flexural (RF), m?dulo de elasticidade (ME) e a resist?ncia de uni?o (RU) de tr?s comp?sitos Bulk Fill fluidos em compara??o a comp?sitos tradicionais de alta viscosidade. Metodologia: Tr?s comp?sitos Bulk fill fluidos (Filtek BKF, Surefil SDR, X-tra Base) e tr?s tradicionais ( Z250 XT, Grandioso, TPH3) foram utilizados. Para RF/ME, 60 amostras (n=10) em forma de barra (7 mm x 2 mm x 1 mm) foram confeccionadas e avaliadas por meio de uma M?quina de Ensaios Universal (MEU). Para PP e RU, cavidades c?nicas (n=10) preparadas em dentina bovina foram restauradas com os materiais. A PP foi analisada atrav?s da raz?o base/topo de microdureza de superf?cie e a RU pelo teste de push-out numa MEU. A TC foi mensurada em incremento ?nico das Bulk Fill e dois incrementos para as tradicionais em MEU acoplada a um extens?metro (n=5). Os dados foram estatisticamente avaliados por meio dos testes ANOVA 2 fatores e Tukey (p<0,05). Resultados: Para ME, as resinas convencionais apresentaram maiores valores diante de todas as resinas BKF, no entanto para a RF elas foram iguais, com exce??o apenas da BKF da VOCO que foi inferior. Para a PP convencionais e BKF foram estatisticamente semelhantes. Na TC e na RU as BKF apresentaram-se superiores as convencionais, tamb?m com exce??o apenas da Xtra Base Bulk Fill (VOCO) que foi estatisticamente igual as convencionais na RU. Conclus?o: As resinas Bulk Fill flu?das testadas BKF e SDR apresentaram as propriedades mec?nicas testadas superiores ou iguais aos comp?sitos tradicionais, exceto o m?dulo de elasticidade. / Objectives: To evaluate depth of polimerization (DP), contraction strress (SC), flexural strenght (FS), elastic modulus (EM) and bond strength (BS) of three low-viscosity Bulk Fill composites resin compare as of high-viscosity traditional composites. Methods: Three Bulk fill composites (Filtek BKF, Surefil SDR, X-tra Base) and three traditional ( Z250 XT, Grandioso, TPH3) were used. For FS/ME, 60 (n=10) bar specimens (7 mm x 2 mm x 1 mm) were prepared and evaluated with Universal Testing Machine (UTM). For DP e BS, conical cavities (n=10) were prepared in bovine dentine and restored with materials. DP was analyzed trough the ratio base/top with microhardness of surface and BS on the push-out test in UTM. SC was measured for to increment one of Bulk Fill Resins and two increments of traditional resins in UTM attached to a extensometer (n=5). The data were statistically evaluated by ANOVA 2-way/Tukey (p<0,05). Results: For EM the conventional resins show higher values compare to all the BKF resins, however for the FS they were the same, except for only the VOCO Bulk Fill that was inferior. For the PP, conventional and BKF were statistically similar. In TC and in BS the BKF were superior to conventional, also with the exception of Xtra Base Bulk Fill (VOCO), which was statistically the same as the conventional ones in the BS. Conclusion: The Bulk Fill composites resin BKF and SDR present most of property physical and mechanical higher or similar than traditional composites, except the elastic modulus.