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This research investigates how different bonding strategies affect the fracture resistance and failure modes of CAD/CAM resin composite overlays.

Influence of Bonding Strategies on the Fracture Resistance and Failure Mode of CAD / CAM Resin Composite Overlays Following Simulated Aging: An In Vitro Comparison

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In vitro comparison assesses bonding protocols' effects on fracture resistance of CAD CAM resin overlays, highlighting significant findings.

This research investigates how different bonding strategies affect the fracture resistance and failure modes of CAD/CAM resin composite overlays.
Sectioned 50 human premolars to expose dentin and enamel.
Created CAD/CAM-milled resin composite overlays and assigned them to five bonding groups.
Conducted thermomechanical aging to simulate clinical service for 1 year.
Performed compressive load testing to determine fracture loads.
Examined failure modes under magnification.
Heated Grandio showed the highest mean fracture load at 1728.28 N.
SDR Flow exhibited the lowest mean fracture load at 835.49 N.
Other groups (Calibra Ceram, Panavia F2, Calibra Universal) had statistically similar intermediate values.
Significant differences identified between SDR Flow and other groups, and between heated Grandio and two other groups.

Elkaffas et al. (2026) studied this question.

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In vitro comparison assesses bonding protocols' effects on fracture resistance of CAD CAM resin overlays, highlighting significant findings.