STATEMENT OF PROBLEM: However the repair of fractured ceramic restoration is the most reasonable and practical alternative treatment, the repair is a challenging clinical situation because after repair the color may change when restoration is aged

Objective: This study was designed to evaluate effect of two surface treatments and aging on color stability of hybrid ceramic repaired with composite.


Method: vita enamic ceramic blocks (14*14 mm) were sliced into discs with constant thickness 1mm using a low speed, high precision Isomet diamond saw 4000 . Specimens were aged in a water bath for 1-months at 37 °C before repair. Specimens were divided into two groups According to surface treatment, the first group (n=8) treated by 9% HF followed by application of silane coupling agent and universal bond and second group (n=8) treated by 9%HF followed by application of universal bond. Repair was performed by packing the composite repair material using a Split Teflon mold (1mm thickness) placed on treated the hybrid ceramic samples. After repair, the samples were thermocycled (5000 cycles: 5–55°C; cyclic). The repaired samples were immersed in coffee solution under the controlled temperature 37°C. Color stability was measured by VİTA Eas yshade Compact.
Results: There was significant difference in color stability for repaired samples before and after aging and staining. The color changes of repaired samples in all groups were above the clinically acceptable value (ΔE ≥3.3).
Conclusion: Based on the type of composite used in present study, there was perceptible color change in the repaired samples.