Effect of Cavity Configuration (C Factor)‎ on the Marginal Adaptation of Low-Shrinking Composite : A Comparative Ex Vivo Study

الملخص EN

Aim.

To investigate the effect of C factor on marginal adaptation of low-shrinking composite (Silorane).The null hypothesis was that the marginal adaptation of “Silorane” is not affected by the cavity configuration.

Materials and Methods.

A Silorane based and a methacrylate based composites, with their corresponding self-etch adhesive systems ``Filtek Silorane/Silorane Adhesive Bond System and Filtek Z250/Prompt L-Pop’’ respectively were used.

Standardized cavities were prepared on the buccal surfaces of 100 maxillary premolars.

Teeth were grouped into 5 groups (n = 20), for the 5 C factors.

Restored teeth were subjected to thermocycling.

Microleakage testing was done and linear dye penetration was assessed using a stereomicroscope.

Statistical analysis was done using the Student’s t-test.

Results.

For the methacrylate based systems’ overall leakage score was significantly higher than the Silorane-based one (P = 0.034).

For the methacrylate-based, leakage was found in all tested teeth groups except group 1 (C factor 1/5).

For the Silorane, One-way ANOVA revealed a statistically significant increase in dye penetration in the 5th group (P = 0.010).

Conclusions.

The null hypothesis was rejected.

The Silorane-based resin although it resulted in a statistically significant good marginal adaptation, it showed tendency toward a high leakage score with C-factor of 5.