Cuspal deflection in premolar teeth restored with a Silorane and a Dimethacrylate-resin based composite (A comparative study)

Abstract

ABSTRACT
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.
Key words: Cuspal deflection, Silorane, Tetric Evoceram, hygroscopic expansion. (J Bagh Coll Dentistry 2011;23(3):
11-16).