The adhesive amalgam--fact or fiction?

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Biomaterials Engineering

Background:

• Dental amalgam restorations are widely used but can be susceptible to dislodgement.
• Retention of amalgam in non-retentive cavities often requires mechanical or chemical aids.
• Evaluating new bonding agents is crucial for improving restoration longevity and predictability.

Purpose of the Study:

• To compare the retentive strength and failure modes of amalgam restorations using different systems.
• To assess the efficacy of Amalgambond and Panavia-Ex compared to traditional methods.
• To investigate the influence of bonding agents on restoration integrity in compromised pulp situations.

Main Methods:

• Forty molar and premolar teeth underwent cavity preparation and restoration with amalgam.
• Restorations were placed using copal varnish (control), a mechanical pin, Amalgambond, or Panavia-Ex.
• Dislodgement forces, energy, and failure modes were recorded and analyzed.

Main Results:

• Pinned restorations exhibited significantly higher dislodgement forces.
• Amalgambond and Panavia-Ex groups showed favorable failure modes and energy requirements, indicating enhanced retention.
• Operator or technique sensitivity was noted for Amalgambond and Panavia-Ex due to film thickness.

Conclusions:

• Amalgambond and Panavia-Ex offer significant advantages over pinned amalgam restorations, particularly in teeth with compromised pulps.
• While pinned restorations are mechanically stronger, newer bonding agents provide better overall performance.
• Technique sensitivity is a critical factor for successful application of Amalgambond and Panavia-Ex.