Shear bond strength of composites using an adhesion booster

Edivaldo de MORAIS, Fábio Lourenço ROMANO, Lourenço Correr SOBRINHO, Américo Bortolazzo CORRER, Maria Beatriz Borges de Araújo MAGNANI

Objective: To evaluate the shear strength of two composites (Transbond XT and Concise) using an adhesion booster (Ortho Primer). Methods: The sample consisted of 90 bovine incisors divided into six groups (n=15). All teeth were subjected to prophylaxis with pumice and enamel etching with phosphoric acid. Transbond XT was used conventionally in Group I. Group II was handled similarly to Group I, except that Ortho Primer was applied instead of XT Primer. After etching, the enamel in Group III was contaminated with saliva, Ortho Primer was then applied and bonding performed using Transbond XT. In Group IV, Concise was used conventionally. Group V was handled similarly to Group IV, except that Ortho Primer was applied instead of the fluid resin. After etching, the enamel in Group VI was contaminated with saliva, Ortho Primer was then applied and bonding performed using Concise. The specimens were stored in distilled water at 37 ºC for 24 hours and subjected to shear strength testing. Data were analyzed with ANOVA and Tukey?s test (5%). Results: Bond strength in Group IV was statistically higher than in Groups II, III and VI (p<0.05). No statistically significant differences were found among Groups I, IV and V, and between I, II, III and VI (p>0.05). When used conventionally, both Transbond XT and Concise yielded the highest bond strength values. When applied to dry enamel, Ortho Primer acted effectively as a bonding agent for the composites under evaluation. When applied to contaminated enamel, Concise yielded low bond strength.

Keywords: Orthodontic brackets. Shear strength. Orthodontics.

How to cite: Morais E, Romano FL, Correr Sobrinho L, Correr AB, Magnani MBBA. Resistência ao cisalhamento da colagem com compósitos utilizando potencializador de adesão. Dental Press J Orthod. 2011 Sept-Oct;16(5):104-10.

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