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Related Experiment Videos

An artificial oral environment for testing dental materials.

R DeLong1, W H Douglas

  • 1Biomaterials Program, School of Dentistry, University of Minnesota, Minneapolis 55455.

IEEE Transactions on Bio-Medical Engineering
|April 1, 1991
PubMed
Summary

This study developed an artificial mouth using servo-hydraulic actuators to simulate human chewing. The device accurately predicts dental wear, correlating 250,000 cycles to one year of human mastication.

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Area of Science:

  • Biomedical Engineering
  • Dental Materials Science
  • Biomechanics

Background:

  • Simulating human mastication is crucial for dental material testing.
  • Existing methods lack the fidelity to replicate complex chewing forces and movements.
  • Understanding dental wear requires a reliable in vitro model.

Purpose of the Study:

  • To develop a novel artificial mouth system using servo-hydraulic actuators.
  • To replicate the force-movement cycle of human mastication.
  • To establish a correlation between artificial and clinical dental wear.

Main Methods:

  • Utilized two servo-hydraulic actuators with a closed-loop control system mimicking neuromuscular function.
  • Employed linearly variable differential transformers (LVDTs) for position monitoring and load cells for force monitoring.

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  • Constructed an acrylic chamber with circulating saliva at 37°C to simulate the oral environment.
  • Optimized the chewing cycle by eliminating non-force phases, increasing chewing rate to 4 cycles/second.

    • Main Results:

    • The artificial mouth successfully simulated human mastication cycles.
    • A high correlation was observed between wear in the artificial mouth and clinical wear.
    • 250,000 cycles in the artificial system were found equivalent to one year of human mastication.

    Conclusions:

    • The developed artificial mouth provides a reliable in vitro model for dental wear studies.
    • The system's ability to mimic human mastication enhances the predictive value for material longevity.
    • This technology can accelerate the development and testing of dental materials and restorations.