Cuspal deflection in premolar teeth restored with a silorane and a dimethacrylate-resin based composite : a comparative study

الملخص EN

Background : This study was conducted to evaluate and compare the cuspal deflection between 2 low-shrinkage resin composites ( Filtek™ Silorane ) and ( Tetric EvoCeram ), and the effect of using light-cured GIC (Vivaglass® Liner( and storage in water on cuspal deflection at different periods.

Materials and methods : Forty extracted maxillary first premolars of approximately similar sizes were prepared with standardized MOD cavities.

The sample teeth then divided into two main groups (20 specimens each) according to the restorative material (group A Filtek™ Silorane and group B Tetric B1 : restored by Tetric EvoCeram with Vivaglass® Liner.

Group B2 : restored only by Tetric EvoCeram.

All samples restored with oblique incremental technique.

The intercuspal distance was measured before and after the restorative procedures and after 1, 2 and 4 weeks of water storage and the difference were recorded as cuspal deflection.

Cuspal deflection was measured using digital micrometer.

Data were analyzed statistically by ANOVA and least significant difference (LSD) test.

Results : Filtek™ Silorane significantly less cuspal deflection.

Vivaglass® Liner significantly reduced cuspal deflection with Tetric EvoCeram.

After four weeks water storage, cuspal deflection in all subgroups were highly significantly different with the two restoratives (P < 0.01) .

While light-cured glass ionomer cement has a non significant effect on cuspal deflection after 4 weeks.

Conclusions : Silorane showed lower cuspal deflection and lower water uptake than Tertic EvoCeram.

Polymerization shrinkage deformation was almost compensated by hygroscopic expansion within 4 weeks.