Bonding Techniques For Partial-Coverage Restorations
Pretreatment: Thorough pumicing and cleaning of tooth surfaces is performed. Phosphoric acid etching of enamel eliminates the smear layer and enhances micro-mechanical retention.
Adhesive Selection: Conventional multi-step total-etch or simplified self-etch adhesives can be utilized. Total-etch is preferred for maximized bond strengths. Hydrophilic resins are recommended.
Application Sequence: For total-etch adhesives, etching is followed by adhesive resin application according to manufacturer guidelines. Solvent evaporation and air thinning are critical steps.
Light Curing: Sufficient light curing of the adhesive resin is performed prior to cementation. This optimizes degree of conversion and bond strengths. Higher irradiance is preferable.
Cement Choice: Dual-cured resin cements are predominantly used. Variations exist in viscosity, film thickness and handling. The cement should be compatible with the adhesive used.
Cement Cleanup: Careful removal of residual excess cement is performed once the cement has initially set. This prevents cement washing out leading to marginal gaps/decay.
Conclusion: By following optimal techniques and protocols for bonding, dentists can achieve successful and durable adhesion for partial-coverage ceramic restorations. Adequate adhesive procedures are imperative for clinical success.