Avaliação "in vitro" da resistencia ao cisalhamento da união de sistemas adesivos sobre esmalte e dentina

AUTOR(ES)
DATA DE PUBLICAÇÃO

1995

RESUMO

The purpose of this study was to evaluate the shear bond strength from eleven adhesive systems commercially available on enamel and dentin surface, also using, scanning electron microscopy to observe the ailure type occured in tooth/composite interface. One hundred seventy-six extracted human permanent molar and premolar teeth were mounted in phenolic rings with cold-cure acrylic resin and the facial surfaces were ground wet in a polishing block on a polishing machine on 180 - followed by 400 - grit silicon carbide paper. Adhesive tape with a circular hole, 4 mm in diameter, was placed on the ground enamel and dentin surfaces to delineate the bonding areas. The delianeated area was treated with one of following adhesive systems: Scotchbond Multi-Purpose and Scotchbond 2 (3M Dental), Optibond and XR Bonding (Kerr), All Bond 2 (Bisco), Denthesive II (Kulzer), Syntac (Vivadent), Multi Bond Alpha (DFL), Heliobond (Vivadent), Pro-bond and Prisma Universal Bond 3 (Caulk / Dentsply). During the utilisation of each adhesive system, the manufacturer s instructions were followed. The composite resin used was that indicated for each manufacturer to each adhesive system, exception to Multi Bond Alpha and All Bond 2 materials, that used the Z-100 composite resin (3M). Next, each composite resin, was inserted in a split metal mold in three increments. Each increment was compressed firmly and exposed to visible ligth for 40 seconds. The specimens were stored in distilled water at 37 `DEGREE´ C for 24 hours and the shear bond strengths were determined by using an Otto Wolpert Werke universal testing machine operated at a cross-head speed of 6 mm/min. After the failure, representative specimens from each group were examined by scanning electron microscopy. In enamel, ANOVA and Tukey s test, at 5% significance level, showed that the product Optibond (14,21 MPa) was superior statistically in relation to other products. Next, came the Scotchbond Multi-Purpose (10,49 MPa), All Bond 2 (10,44 MPa) and Syntac (10,42 MPa) that were statistically equal between themselves and superior in relation to the other products. After, came the products Pro-Bond (8,11 MPa), Multi Bond Alpha (8,00 MPa), Denthesive II (7,89 MPa) and XR Bonding (7,37 MPa) that were statistically equal between themselves and superior to the products Scotchbond 2 (6,25 MPa), Prisma Universal Bond 3 (6,23 MPa) and Heliobond (5,12 MPa), that were equal between. In dentin, ANOVA and Tukey s test, at 5% significance level, showed that the MPa) were statistically equal between themselves and superior in relation to the other products. Next, carne the products Denthesive II (4,30 MPa), Syntac (4,29 MPa), Pro-Bond (4,04 MPa), Prisma Universal Bond 3 (3,59 MPa), XR Bonding (3,44 MPa), Scotchbond 2 products Optibond (6,17 MPa), Scotchbond Multi-Purpose (6,06 MPa), All Bond 2 (5,39 themselves. The products Xr Bonding, Scotchbond 2 and Prisma Universal Bond 3, were statistically equal between themselves. "third and first generation" products type was the coesive one in adhesive. Now, in dentin samples, coesive failure occured in adhesive to "fourth generation" producd, and adhesive failure at dentin/composite interface to Electronmicrographs of enamel surfaces showed that the most common failure products. The products All Bond 2, Denthesive II, Syntac and Pro-Bond, were statisticalIy equal between themselves (3,39 MPa) and Multi Bond Alpha (3,38 MPa), that were statistically equal between themselves and superior to the product Heliobond (1,40 MPa), that was inferior to all products. The products All Bond 2, Denthesive II, Syntac and Pro-Bond, were statisticalIy equal between themselves. Electronmicrographs of enamel surfaces showed that the most common failuretype was the coesive one in adhesive. Now, in dentin samples, coesive failure occured in adhesive to "fourth generation" producd, and adhesive failure at dentin/composite interface to "third and first generation" products

ASSUNTO(S)

dentina enamels - dentistry esmalte dentario cisalhamento dentin adesivos dentarios dental adhesives shear materiais dentarios

ACESSO AO ARTIGO

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