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A lining system for composite resin fillings.

¹Department of Technology and Dental Materials, University of Lund, School of Dentistry, Malmo, Sweden.

The Journal of Prosthetic Dentistry

|February 1, 1990

Summary

A novel expanding liner effectively prevented microleakage in composite resin fillings, addressing a common issue in dental restorations. This water-activated liner significantly reduced dye penetration in both laboratory and animal studies.

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Area of Science:

Dental Materials Science
Biomaterials Engineering

Background:

Microleakage at the margins of composite resin fillings is a significant clinical challenge.
High contraction rates during curing of microfilled composite resins contribute to marginal gaps.

Purpose of the Study:

To evaluate the efficacy of a novel water-expanding liner in preventing marginal microleakage.
To assess the performance of the liner in Class V cavities using both in vitro and in vivo models.

Main Methods:

Class V cavities were prepared in extracted human teeth and beagle teeth.
An experimental liner containing aluminosilicate crystals was applied to dentin walls before composite resin insertion.
Specimens underwent thermocycling and sectioning (in vitro) or were extracted after 14 weeks (in vivo) for microscopic dye penetration analysis.

Main Results:

The expanding liner demonstrated a significant reduction in dye penetration.
Almost complete prevention of microleakage was observed in both in vitro and animal experiments.
The liner's water-expansion property appears to counteract composite resin shrinkage.

Conclusions:

The experimental water-expanding liner shows high potential for preventing marginal microleakage in composite resin restorations.
This liner could offer a valuable solution to improve the longevity and clinical performance of dental fillings.
Further research is warranted to explore its long-term clinical effectiveness and biocompatibility.

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