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Related Experiment Videos

Denture mobility with six degrees of freedom during function

K Miyashita1, T Sekita, S Minakuchi

  • 1Tokyo Medical and Dental University, Faculty of Dentistry, Department of Geriatric Dentistry, Japan.

Journal of Oral Rehabilitation
|August 29, 1998
PubMed
Summary

This study developed a 3-D system to track denture and jaw movements. Upper denture mobility correlates with jaw closure path, while lower dentures move towards the working side.

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Area of Science:

  • Biomedical Engineering
  • Dental Mechanics
  • Biomechanics

Background:

  • Understanding complete denture mobility is crucial for functional restoration.
  • Mandibular movements significantly influence denture stability and performance.
  • Existing methods may not fully capture simultaneous 3-D denture and mandibular dynamics.

Purpose of the Study:

  • To develop and validate a system for simultaneous 3-D measurement of complete denture and mandibular motion.
  • To investigate the relationship between denture movements and mandibular closure paths during function.

Main Methods:

  • Utilized a 3-D motion capture system with four infrared cameras.
  • Analyzed denture-mandibular relationships via normal vector inner products of occlusal and mandibular planes.

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  • Classified mandibular movements into normal (ipsilateral) and reverse (contralateral) strokes.

    • Main Results:

    • The developed system achieved high accuracy, measuring denture mobility within a 0.3 mm error.
    • Upper denture mobility demonstrated a correlation with the mandibular closure path.
    • Lower denture mobility showed a trend towards the working side during function.

    Conclusions:

    • The validated 3-D system accurately measures denture and mandibular dynamics.
    • Denture mobility is influenced by mandibular kinematics, particularly the closure path.
    • Findings provide insights into optimizing complete denture design and stability.