Microleakage of dentin-amalgam bonding agents

Area of Science:

• Dental Materials Science
• Restorative Dentistry
• Biomaterials

Background:

• Dental amalgam restorations are susceptible to microleakage, potentially leading to secondary caries and pulpal issues.
• Dentin bonding systems and resin liners are employed to improve the seal of amalgam restorations.
• The interaction between different amalgam alloys and liner systems requires further investigation.

Purpose of the Study:

• To compare the in vitro microleakage of various dentin bonding/resin liner systems.
• To evaluate these systems when used with both spherical (Dispersalloy) and admixture (Tytin) amalgam alloys.

Main Methods:

• Class V cavities were prepared on human molars with enamel and dentin margins.
• Restorations were made using Dispersalloy or Tytin alloy with no liner, Copalite varnish, Amalgambond Plus/HPA, Tenure/Panavia EX, Syntac/Dual Cem, or All-Bond 2/Liner F.
• Samples underwent thermocycling, staining, and sectioning for microleakage assessment.

Main Results:

• All tested dentin bond/resin liner systems significantly reduced microleakage compared to unlined or Copalite-lined controls.
• No significant difference in overall microleakage was observed between the Dispersalloy and Tytin alloys.
• The Tenure with Panavia EX system showed significantly less microleakage with Tytin alloy, while Syntac/Dual Cem showed more with Dispersalloy.

Conclusions:

• Dentin bonding systems and resin liners are effective in minimizing microleakage in amalgam restorations.
• System selection and alloy type can influence the degree of microleakage.
• Further research is warranted to optimize material combinations for improved clinical longevity.