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Abstract

Objectives: This study investigated the effect of marginal adaptation and internal fit of premolar teeth restored with indirect overlays, fabricated from different CAD/CAM materials (lithium-disilicate and composite blocks).
Materials and Methods: Twenty-two intact premolars with standardized concave chamfer overlay preparation were divided into two groups (n= 18) Group (A): lithium disilicate blocks and Group (B): composite blocks. All groups cemented with dual cured resin cement. After 24h of storage at 37°C followed by thermocycling. Marginal gap evaluation evaluated using a stereomicroscope at x50 magnification at 4 points at each surface. Specimens were then sectioned mesiodistally to assess internal fit. Statistical analysis was performed using student t-test at p<0.05.
Results: Composite blocks showed higher but statistically similar marginal and internal gap mean values.
Conclusions: Using composite blocks in fabrication of overlay restorations provided comparable marginal and internal gap results to lithium disilicate blocks.