Mashael M Bin Hasan.
The Effect Of Different Surface Treatments On Shear Bond Strength Of A Low Shrinkage Composite To Enamel.
Pak Oral Dental J Jan ;37(1):142-7.

This study evaluated the effect of different surface treatment protocols on Shear bond strength of a low shrinkage Silorane-based composite to enamel. Twenty four extracted molars were used. The convex enamel surfaces were reduced by silicone carbide paper to obtain a flat enamel surface. The teeth were distributed into four groups according to the treatment protocols. Etch and rinse adhesive system (Excite, Ivoclar Vivadent, Schaan, Liechtenstein) with methacrylate-based composite (Tetric N Ceram, Ivoclar Vivadent Schaan, Liechtenstein) was used as a control group. Three adhesive application modalities were used for teeth restored with silorane-based composite (Filtek P90/P90 Adhesive System, 3M ESPE St. Paul, MN, USA) as follows: according to the manufacturer’s instructions (self-etching), pre-etching with phosphoric acid and with double application of the self-etching primer. The specimens were thermocycled and shear bond strength was determined in Instron Universal Testing Machine at a crosshead speed of 0.5mm/min. No significant difference was found between etch & rinse group and phosphoric acid pre- etched Filtek P90 group; both were significantly higher than that of Filtek P90 self-etching and the double self-etch primer application. The double self-etch primer application Filtek P90 group showed the lowest strength when compared to other groups. It can be concluded that pre-etching with phosphoric acid results in better bond performance of silorane based composite specific self-etching adhesive system to enamel.

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