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New dynamic corrosion test for dental materials.

E I Meletis, C A Gibbs, K Lian

Dental Materials : Official Publication of the Academy of Dental Materials

|November 1, 1989

Summary

A new lab technique simulates dental amalgam wear and corrosion. This study found that wear significantly increases amalgam corrosion rates, highlighting a key factor in restoration degradation.

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Area of Science:

Biomaterials Science
Dental Materials Research
Tribocorrosion

Background:

Dental amalgam restorations degrade due to oral environment exposure and mechanical forces.
Combined wear and corrosion are significant contributors to dental amalgam degradation.
Existing methods may not fully capture the synergistic effects of wear and corrosion.

Purpose of the Study:

To develop and demonstrate a novel laboratory technique for simulating combined mechanical wear and corrosion in dental materials.
To evaluate the impact of this simulated oral environment on dental amalgam restorations.
To quantify the effects of sliding-wear on electrochemical properties.

Main Methods:

Development of a laboratory technique to simultaneously apply mechanical sliding-wear and electrochemical corrosion.
Capability to vary and measure electrochemical and mechanical parameters during the process.
Testing a high-copper dental amalgam to validate the method's applicability.

Main Results:

The developed technique successfully simulated combined wear and corrosion processes.
Sliding-wear was found to significantly decrease the corrosion potential of the tested dental amalgam.
Corrosion rates increased by at least one order of magnitude due to sliding-wear.

Conclusions:

The new laboratory technique is effective for studying the tribocorrosion of dental materials.
Mechanical wear exacerbates the corrosion of dental amalgams in simulated oral conditions.
Understanding these combined effects is crucial for improving the longevity of dental restorations.

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