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Previous issue date: 2014-02-24 / The aim of this study was to evaluate the bond strength of Scotchbond Universal to dentin in both total-etch and self-etch applications after storage in water for 24 h and 6 months. The occlusal surface of 24 third molars was removed to obtain flat dentin surfaces, and the teeth were divided into four groups (n=6/grupo): G1 total-etch application of Scotchbond Universal; G2 self-etch application of Scotchbond Universal; G3 Scotchbond Multi Purpose (total-etch application control); G4 Clearfil SE Bond (self-etch application control). Following the adhesive application, a 6 mm height block of composite resin Z250 was built on the adhesive area. After storage in distilled water at 37?C for 24 hours, the tooth/resin sets were cut parallel to the long axis of the tooth, in the x and y directions, with a section of about 0.8 mm2. Forty specimens were obtained for each group; 20 specimens were immediately submitted to microtensile bond strength test, and the others after storage in distilled water at 37o C for 6 months. The microtensile bond strength test was performed in an universal testing machine (EMIC-DL 2000) at 0.5 mm/min crosshead speed. The failures were observed in scanning electron microscopy (SEM). Additionally, two sets of each group were sectioned mesio-distal in the center of their crown with a diamond blade. The surfaces were polished by wet sanding with 400, 600 and 1200-grit silicon carbide abrasive paper, followed by polishing with 6, 3, 1 and ? m diamond paste. The samples were demineralized, deproteinized, dried, metalized and observed on a scanning electron microscope at 1.500x. The bond strength means (MPa) obtained were the following: 24 h G1 (39.37); G2 (31.02); G3 (35.09); G4 (35.84); 6 months G1 (36.99); G2 (40.58); G3 (32.44); G4 (41.75). According to two-way ANOVA, there was no significance for adhesive system (p=0,110) and storage time (0,108), but the interaction of adhesive system and storage time was significant (p=0.015). At 24 h, there was no statistical difference in bond strength between the adhesive systems (p>0,05). At 6 months, there was statistical difference between the adhesive systems (p<0.05). Clearfil SE Bond obtained the higher bond strength mean, not differing statistically from self-etch application of Scotchbond Universal. Total-etch application of Scotchbond Universal did not differ statistically from Scotchbond Multi Purpose. Most of failures were mixed in both periods of evaluation. The SEM images of the adhesive interface of Scotchbond Universal total-etch application and Scotchbond Multi Purpose showed thicker hybrid layers and more resin tags in comparison with Scotchbond Universal self-etch application and Clearfil SE Bond. It was concluded that the simplification of Scotchbond Universal in one bottle did not decrease the bond strength of this adhesive to dentin during 6 months of storage. / O objetivo do estudo foi avaliar a resist?ncia de uni?o ? dentina do sistema adesivo Scotchbond Universal na vers?o total-etch e self-etch em 24 horas e 6 meses de armazenamento. A superf?cie oclusal de 24 dentes terceiros molares h?gidos foi removida para obter superf?cie plana em dentina, sendo divididos aleatoriamente em quatro grupos (n=6/grupo): G1 - Scotchbond Universal na vers?o total-etch; G2 Scotchbond Universal na vers?o self-etch; G3 Scotchbond Multi Purpose (controle da vers?o total-etch); G4 Clearfil SE Bond (controle da vers?o self-etch). Sobre o sistema adesivo foi confeccionado um bloco de 6 mm de altura em resina composta Z250. Ap?s 24 horas de armazenagem em ?gua destilada a 37? C, os conjuntos dente/resina foram cortados paralelamente no longo eixo do dente, nos sentidos x e y, com sec??o de aproximadamente 0,8 mm2. Quarenta corpos de prova foram obtidos para cada grupo, sendo 20 submetidos imediatamente ao teste de resist?ncia ? microtra??o e, os outros 20, ap?s 6 meses de armazenamento em ?gua destilada a 37? C. O ensaio de microtra??o foi realizado em uma m?quina de ensaio universal EMIC DL-2000, com uma velocidade de 0,5 mm/min. Os tipos de falha foram observados em microscopia eletr?nica de varredura (MEV). Adicionalmente, dois conjuntos dente/resina foram preparados e seccionados no sentido m?sio-distal, no centro de suas coroas, com um disco diamantado de dupla face. As superf?cies foram polidas com lixas de carbeto de sil?cio 400, 600 e 1200, seguido de polimento com pastas diamantadas de granula??o 6, 3, 1 e ? m. As amostras foram desmineralizadas, desproteinizadas, secadas, metalizadas e observadas em MEV em aumento de 1.500 vezes. No teste de microtra??o as m?dias obtidas (MPa) foram as seguintes: 24 h G1 (39,37); G2 (31,02); G3 (35,09); G4 (35,84); 6 meses G1 (36,99); G2 (40,58); G3 (32,44); G4 (41,75). De acordo com o teste ANOVA de duas vias n?o houve signific?ncia para o sistema adesivo (p=0,110) e para o tempo (0,108), mas apenas para a intera??o entre sistema adesivo e tempo (p=0,015). No per?odo de 24 horas, n?o houve diferen?a estat?stica significativa na resist?ncia ? microtra??o entre os sistemas adesivos (p>0,05). Na avalia??o de seis meses de armazenamento, houve diferen?a estat?stica entre os sistemas adesivos (p<0,05). O Clearfil SE Bond apresentou o maior valor m?dio de resist?ncia ? microtra??o, n?o diferindo estatisticamente do Scotchbond Universal self-etch e total-etch. O Scotchbond Universal total-etch n?o diferiu estatisticamente do Scotchbond Multi Purpose. Os tipos de falha foram predominantemente mistas para os dois per?odos de avalia??o. A interface adesiva do Scotchbond Universal na vers?o total-etch e o Scotchbond Multi Purpose apresentaram camada h?brida mais espessa e mais tags de resina em compara??o ao Scotchbond Universal na vers?o self-etch e Clearfil SE Bond. Concluiu-se que a simplifica??o em frasco ?nico do Scotchbond Universal n?o causou diminui??o nos valores de resist?ncia de uni?o deste material ? dentina em at? 6 meses de avalia??o.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1256 |
| Date | 24 February 2014 |
| Creators | Manfroi, Fernanda Borguetti |
| Contributors | Spohr, Ana Maria |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, BR, 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, 500, 600, 4673435736271820140 |
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