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Microleakage of "surface-sealing" materials

C H Pameijer¹, S L Wendt

¹Department of Prosthodontics, School of Dental Medicine, University of Connecticut, Farmington 06030, USA.

American Journal of Dentistry

|February 1, 1995

Summary

This study evaluated dental material sealing properties using thermal cycling. Zinc oxide and eugenol showed the most dye leakage, while a resin composite system exhibited the least, questioning its use as a surface seal.

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Area of Science:

Dental Materials Science
Restorative Dentistry
Biomaterials

Background:

Effective sealing of dental restorations is crucial for preventing secondary caries and ensuring longevity.
Various materials are used as surface seals to enhance the marginal integrity of restorations.
Understanding the sealing efficacy of different materials under challenging conditions is essential for clinical practice.

Purpose of the Study:

To evaluate and compare the marginal sealing properties of several dental materials when used as surface seals.
To assess the impact of thermal cycling on the integrity of these dental materials.
To determine the most effective surface-seal material among the tested options.

Main Methods:

Six experimental groups and six control groups of restored teeth were prepared.
Experimental groups involved surface sealing with materials like IRM, glass ionomer, amalgam, dentin bonding agent, resin composite, experimental hybrid cement, and zinc oxide-eugenol.
Teeth underwent thermal cycling, sectioning, and dye leakage assessment (0-3 score) to quantify sealing effectiveness.

Main Results:

Zinc oxide and eugenol exhibited the highest degree of dye leakage, indicating poor sealing performance.
The resin composite system (TPH) demonstrated the least amount of dye leakage, suggesting superior sealing capabilities.
Significant variations in sealing properties were observed among the tested dental materials.

Conclusions:

The findings question the suitability of zinc oxide and eugenol as a reliable surface-seal material due to its high leakage.
Resin composite systems appear to offer superior marginal sealing compared to other tested materials.
Further research into advanced sealing materials is warranted to improve restoration longevity and reduce failure rates.

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