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Previous issue date: 2016-02-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The aim of the study was to evaluate, in vitro, the weakest bond interface in Lava Ultimate onlays luted to the tooth preparation with Single Bond Universal and RelyX Ultimate. The following variables were tested: a) total-etch or the self-etch technique; b) with and without adhesive application on the internal surface of the onlay; c) with and without cyclic loading. Fifty-six Lava Ultimate onlays were milled and luted to the human tooth preparations according to the variables, being formed eight groups (n = 7): G1 and G2 - Single Bond Universal applied in the total-etch mode; G3 and G4 - Single Bond Universal applied in the self-etch mode; G5 and G6 - Single Bond Universal applied in the total-etch mode + adhesive application on the onlay; G7 and G8 - Single Bond Universal in the self-etch mode + adhesive application on the onlay. The onlays were luted with RelyX Ultimate. After storage in distilled water at 37? C for 24 h, only the samples from G2, G4, G6 and G8 were submitted to cyclic loading at 100 N using 1000,000 cycles. Beams with a cross section area of ~0.80 mm2 from all groups were obtained and submitted to a microtensile bond strength test in a universal testing machine at a crosshead speed of 0.5 mm/min. The types of failure were observed in optical microscope. The microtensile bond strength values were analyzed by three-way ANOVA and post-hoc multiple comparison using Tukey?s test (?=0.05). There was a significant interaction between the three factors (p = 0.006).The means followed by the same letter represent no statistical difference for the microtensile bond strength (MPa): G6 = 34.64 (?34.64)a, G1 = 34.48 (?12.58)a, G2 = 31.94 (?9.18) ab, G5 = 30.88 (?6.85)abc, G7 = 26.66 (?8.25)bc, G8 = 24.03 (?7.65)cd, G4 = 18.81 (?4.14)de, G3 = 14.64 (?5.35)e. Most failures were at the resinous agent-restoration interface. It was concluded that the resinous agent-restoration interface corresponds to the weakest interface in Lava Ultimate onlays luted with Single Bond Universal and RelyX Ultimate. The application of Single Bond Universal on the internal surface of the onlay was not a relevant procedure. / Este estudo teve como objetivo avaliar, in vitro, a interface de uni?o menos resistente de onlays em resina composta Lava Ultimate cimentadas ao preparo dent?rio com Single Bond Universal e RelyX Ultimate, nas seguintes vari?veis: a) aplica??o do sistema adesivo no modo total-etch e self-etch; b) com e sem aplica??o do adesivo na superf?cie interna da onlay; c) sem e com ciclagem mec?nica. Ao total foram fresadas 56 onlays em resina composta Lava Ultimate, sendo cimentadas aos preparos em dentes humanos de acordo com as vari?veis empregadas, sendo formados oito grupos (n=7): G1 e G2 - Single Bond Universal na vers?o total-etch; G3 e G4 - Single Bond Universal na vers?o self-etch; G5 e G6 - Single Bond Universal na vers?o total-etch + adesivo na onlay; G7 e G8 - Single Bond Universal na vers?o self-etch + adesivo na onlay. As onlays foram cimentadas com o cimento resinoso RelyX Ultimate. Ap?s armazenamento em ?gua destilada a 37? C por 24 h, apenas as amostras do G2, G4, G6 e G8 foram submetidas ? ciclagem mec?nica com carga vertical de 100 N na superf?cie oclusal das coroas, totalizando 1.000.000 de ciclos. Todas as restaura??es, de todos os grupos, foram seccionadas nos eixos x e y para obten??o de corpos de prova em forma de palitos, com aproximadamente 0,80 mm2 de sec??o transversal. Os corpos de prova foram submetidos ao teste de microtra??o na m?quina de ensaio universal EMIC-DL 2000 com velocidade de 0,5 mm/minuto. Os tipos de falha foram observados em microsc?pio ?ptico. Os valores de resist?ncia ? microtra??o foram analisados pela ANOVA de tr?s vias, seguido do teste de Tukey ao n?vel de signific?ncia de 5%. Houve intera??o significativa entre os tr?s fatores (p=0,006). As m?dias seguidas de mesma letra n?o diferem estatisticamente para a resist?ncia ? microtra??o (MPa): G6 = 34,64 (?34,64)a, G1 = 34,48 (?12,58)a, G2 = 31,94 (?9,18) ab, G5 = 30,88 (?6,85)abc, G7 = 26,66 (?8,25)bc, G8 = 24,03 (?7,65)cd, G4 = 18,81 (?4,14)de, G3 = 14,64 (?5,35)e. A maioria das falhas foram na interface agente resinoso-restaura??o. Conclui-se que a interface agente resinoso/restaura??o corresponde ? interface menos resistente na cimenta??o de onlays em resina composta Lava Ultimate quando empregado o sistema adesivo Single Bond Universal e o cimento resinoso RelyX Ultimate. A aplica??o do adesivo Single Bond Universal na superf?cie interna da restaura??o n?o se mostrou um procedimento relevante.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/6795 |
| Date | 29 February 2016 |
| Creators | Souza, Ivana Agnoletto |
| Contributors | Spohr, Ana Maria |
| 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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