Resin Composite Repair
The performances of contemporary resin composite and dental adhesives are favorable, especially for direct restorations. However, failures of resin composite restorations, such as chipping, bulk fracture, discoloration, and secondary caries, are still found. Removing the whole failed restoration and replacing the new one results in further loss of tooth structure, particularly in location that are distance from the site of restoration failure. Removing only the defective part and partial replacement of resin composite, i.e. repairing, is a legitimate alternative to replacing the entire restoration. This review discusses the repair of defective resin composite restorations in terms of the effectiveness and the bond strength of the repair. The results from clinical studies showed that repair of restorations is effective, and the survival rate at 7-year follow-up is good. For optimal repair bond strength, many studies suggested mechanical roughening of the existing resin composite follow by application of dental adhesive. Different resin composites showed no effect on the repair bond strength, as long as those composites based on dimethacrylate. However, if the new composite material or the existing resin composite is silorane-based material (e.g., P90), using a silane-based adhesive can increase the repair bond strength.
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