Microleakage and the class V composite cavosurface

Area of Science:

• Restorative Dentistry
• Dental Materials

Background:

• Microleakage around dental restorations is a persistent clinical challenge.
• Understanding factors influencing marginal seal is crucial for restoration longevity.

Purpose of the Study:

• To evaluate the effectiveness of different surface treatments on reducing microleakage in composite restorations.
• To compare the sealing capabilities of various techniques at different margins (gingival vs. occlusal).

Main Methods:

• Composite restorations were placed using various protocols, including acid etching and beveling.
• Dye penetration was used to assess the extent of marginal leakage.
• Leakage was quantified at both gingival and occlusal margins.

Main Results:

• Substantial leakage was observed around unetched composite restorations.
• Etching peripheral enamel significantly decreased dye penetration.
• Beveling the cavosurface margin, combined with acid etching, significantly reduced leakage.
• The gingival margin exhibited greater leakage than the occlusal margin.
• Intermediary bonding resin did not improve marginal sealing compared to etchant alone.

Conclusions:

• No single tested procedure completely eliminated microleakage.
• Acid etching and beveling cavosurface margins are effective in reducing composite restoration leakage.
• Gingival margins are more susceptible to leakage than occlusal margins.