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Related Experiment Videos

How to qualify and validate wear simulation devices and methods.

S D Heintze1

  • 1R&D, Ivoclar Vivadent AG, Bendererstrasse 2, FL-9494 Schaan, Liechtenstein. siegward.heintze@ivoclarvivadent.com

Dental Materials : Official Publication of the Academy of Dental Materials
|April 1, 2006
PubMed
Summary

Dental restoration wear is complex, impacting aesthetics and function. Current in vitro wear simulation methods lack standardization and clinical relevance, hindering reliable material assessment. Further research is needed for validated wear testing.

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Area of Science:

  • Biomaterials Science
  • Dental Materials Engineering
  • Tribology

Background:

  • Dental restoration wear significantly affects aesthetics and function.
  • Systemic effects of ingested or inhaled wear particles remain largely unknown.
  • In vivo wear measurements are challenging, necessitating development of reliable in vitro simulation methods.

Purpose of the Study:

  • To evaluate existing in vitro wear simulation devices and methods for dental materials.
  • To identify factors influencing wear parameters and assess the reproducibility of results.
  • To explore the potential for developing validated wear testing protocols.

Main Methods:

  • Review of commonly cited wear simulators (Alabama, ACTA, OHSU, Zurich, MTS, Willytec).
  • Analysis of force control, regulation, and validation capabilities of different devices.

Related Experiment Videos

  • Evaluation of wear data variability and reproducibility across methods.
  • Correlation of material properties with wear results using the Ivoclar method on the Willytec simulator.

    • Main Results:

    • Most wear simulators lack controlled force application, leading to high variability (28-40%) and poor reproducibility (22-72%).
    • The MTS wear simulator is qualified under FDA Good Laboratory Practice guidelines for in vitro testing.
    • The Willytec chewing simulator offers a practical compromise with lower variability (12%).
    • A wear formula was developed to predict wear for composite resins using the Ivoclar method.
    • Round robin tests showed non-comparable results across different wear simulation methods.

    Conclusions:

    • Current in vitro wear simulation methods for dental materials lack standardization and validation.
    • The MTS and Willytec simulators show promise but require further validation for clinical relevance.
    • Prospective studies correlating in vitro and in vivo results are essential for establishing clinical relevance of wear testing.