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Previous issue date: 2015-03-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Objectives : To evaluate the maximum fracture load and the failure pattern of endodontically treated molars restored with endocrown by CAD-CAM system. Methods : Thirty healthy extracted molars were randomly assigned into 3 groups (n=10). After endodontic treatment, teeth were restored with endocrowns by CEREC/InLab (Sirona) system with three different materials: e.max CAD (Ivoclar Vivadent), Vita Mark II (VITA) or Lava Ultimate (3M ESPE). The specimens were subjected to the fractured resistance testing after 1,000,000 cyclic fatigue loading at 100N. Subsequently, they were tested in a universal testing machine with a crosshead speed of 1mm/min with compressive force to the long axis of the tooth. Results : According to a 2-way analysis of variance, the means of fracture resistence were (means followed by the same letter show no significant difference to ANOVA and Tukey) (p <0.05): Lava Ultimate 3048,6N ? 730.33 (A), e.max CAD 2188,5N ? 704.82 (B) and Vita Mark II 1129,5N ? 491.31 (C). Chi-square test (p = 0.0342) presented mostly restoration fractures to Vita Mark II (80%), statistically differing from the other groups. Fisher Exact test demonstrated predominantly reparable prognosis to Vita Mark II and unreparable to e.max CAD (p = 0.0029). Conclusion : Lava Ultimate showed the highest fracture resistance values, while Vita Mark II, the lowest. Vita Mark II group obtained predominantly reparable prognosis. In the other groups, the failure pattern was tooth + restoration with unfavorable prognosis to e.max CAD. / Objetivos : avaliar a carga m?xima de fratura e o padr?o de falha de restaura??es endocrown realizadas com sistema CAD-CAM cimentadas sobre molares tratados endodonticamente. Materiais e m?todos : trinta dentes molares h?gidos extra?dos foram distribu?dos aleatoriamente em 3 grupos (n=10). Ap?s serem endodonticamente tratados, foram restaurados com endocrowns realizadas atrav?s do sistema CEREC/InLab (Sirona) com tr?s diferentes materiais: e.max CAD (Ivoclar Vivadent), Vita Mark II (VITA) ou Lava Ultimate (3M ESPE). Ap?s, foram submetidos ? fadiga mec?nica com aplica??o de carga vertical de 100N, totalizando 1.000.000 de ciclos. Posteriormente, foi testada a carga m?xima de fratura com for?a compressiva ao longo eixo do dente sob velocidade de 1mm/min. Resultados : Os resultados obtidos ap?s o ensaio de carregamento m?ximo de fratura foram (m?dias seguidas de mesma letra n?o apresentam diferen?a estat?stica para ANOVA e Tukey) (p<0,05): Lava Ultimate 3048,6N?730,33 (A), e.max CAD 2188,5N?704,82 (B) e Vita Mark II 1129,5N?491,31 (C). Conforme o teste qui-quadrado (p= 0.0342) o grupo Vita Mark II apresentou a maior propor??o para as fraturas somente em restaura??o (80%), diferindo estatisticamente dos demais grupos. O teste Exato de Fisher evidenciou progn?stico predominantemente recuper?vel ao Vita Mark II e irrecuper?vel ao e.max CAD (p= 0,0029). Conclus?o : O Lava Ultimate apresentou maior resist?ncia ? fratura, enquanto a cer?mica Vita Mark II, a menor. O grupo Vita Mark II apresentou progn?stico predominantemente recuper?vel. As fraturas nos demais grupos predominaram em dente+restaura??o, com progn?stico desfavor?vel ao e.max CAD.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/6240 |
| Date | 06 March 2015 |
| Creators | Slomp, Cilea |
| Contributors | Burnett Junior, Luiz Henrique |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, Brasil, Faculdade de Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 600, 600, 600, 600, 4673435736271820140, -2070498469879244349, 2075167498588264571 |
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