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[The relationship between three-dimensional occlusal force and tooth displacement depending on clenching force in

Masaaki Suzuki1

  • 1Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University.

Kokubyo Gakkai Zasshi. the Journal of the Stomatological Society, Japan
|April 25, 2006
PubMed
Summary

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This study found that upper molars move palatally with increased occlusal force, while lower molars displace lingually. Force direction and intensity showed varied relationships with tooth displacement in molars.

Area of Science:

  • Biomechanical analysis of dental structures.
  • Investigation into masticatory system dynamics.

Context:

  • Understanding the biomechanics of the masticatory system is crucial for dental health.
  • Previous research has explored occlusal forces but lacked detailed in vivo 3D analysis of tooth displacement.

Purpose:

  • To evaluate the relationship between occlusal force and three-dimensional tooth displacement in upper and lower first molars during function.
  • To analyze the direction and magnitude of occlusal forces and corresponding tooth movements in vivo.

Summary:

  • Utilized a 3D tooth displacement transducer (Type M-3) and a novel 3D occlusal force sensor to measure upper and lower first molar responses during light and heavy clenching.
  • Upper first molars exhibited palato-apical displacement coinciding with occlusal force direction, with increased palatal movement correlating to higher forces.

Related Experiment Videos

  • Lower first molars showed apical occlusal force but lingual displacement, suggesting different force absorption mechanisms, potentially involving mandibular deformation.

    • Impact:

    • Provides novel in vivo data on differential biomechanical responses of upper and lower molars to occlusal forces.
    • Suggests that occlusal force energy is dissipated through alveolar bone distortion in upper molars and mandibular deformation in lower molars.
    • Informs clinical understanding of tooth mobility, orthodontic force application, and prosthetic design.