Marginal adaptation of composite resins

Area of Science:

• Dental Materials Science
• Restorative Dentistry

Background:

• Composite resins are widely used in dental restorations.
• Ensuring a proper marginal seal is crucial for restoration longevity and preventing secondary caries.

Purpose of the Study:

• To investigate the marginal adaptation of three commercial composite resins.
• To assess the marginal seal quality in Class II and Class V dental restorations.

Main Methods:

• Dye penetration tests were employed to detect marginal leakage.
• Scanning electron microscopy (SEM) of replicas was used to measure the gap at the tooth/restoration interface.
• 100 Class II and Class V restorations were examined.

Main Results:

• Marginal leakage was observed in Class V restorations.
• The gap at the tooth/restoration interface was consistently larger cervically compared to occlusally in leaking Class V restorations.
• Inconsistent marginal seal was noted both peripherally and along internal line angles.

Conclusions:

• Achieving a reliable marginal seal with current composite resins remains a challenge.
• The findings highlight the need for improved composite resin formulations or techniques to enhance marginal adaptation and reduce leakage.