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Biting efficiency in relation to incisal angulation.

Zhongquan Sui1, Kalpana R Agrawal, Harold Corke

  • 1Department of Botany, University of Hong Kong, Pokfulam Road, Hong Kong, PR China. zqsui@hkusaua.hku.hk

Archives of Oral Biology
|December 27, 2005
PubMed
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Incisor orientation significantly impacts jaw function efficiency. Optimal incisor alignment, particularly slight proclination, minimizes the work required for biting, suggesting orthodontic corrections can improve function.

Area of Science:

  • Biomechanical Engineering
  • Dental Mechanics
  • Food Science

Background:

  • Incisor tooth orientation relative to jaw movement path influences biting efficiency.
  • Understanding this relationship is crucial for dental mechanics and orthodontics.

Purpose of the Study:

  • To investigate how incisor angulation affects the force required to fracture food materials.
  • To determine the optimal incisor orientation for efficient food processing.

Main Methods:

  • Upper and lower incisors from a dental model were used in a mechanical tester.
  • Incisors were driven into starch gel and Cheddar cheese blocks at various angles.
  • Work to fracture and fracture patterns were measured and analyzed.

Main Results:

Related Experiment Videos

  • Food type, incisor type, and angle of inclination significantly affected work to fracture.
  • Minimal work was observed at slight proclination angles, with significant increases beyond 40 degrees.
  • Retroclination and large proclination angles resulted in off-axis fractures with no significant work reduction.

Conclusions:

  • Human incisors function most efficiently at small gapes with specific orientations.
  • Orthodontic corrections that optimize incisor alignment can provide significant functional benefits.