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Related Experiment Videos

Occlusal forces in normal- and long-face adults.

W R Proffit, H W Fields, W L Nixon

    Journal of Dental Research
    |May 1, 1983
    PubMed
    Summary

    Individuals with long faces exhibit significantly lower occlusal force during maximum effort, simulated chewing, and swallowing compared to those with normal facial dimensions. Jaw separation did not affect force measurements in either group.

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    Area of Science:

    • Biomedical Engineering
    • Orthodontics
    • Dental Biomechanics

    Background:

    • Occlusal force is a critical factor in masticatory function and overall oral health.
    • Facial morphology, particularly vertical facial dimensions, may influence occlusal force generation.
    • Understanding these relationships is important for diagnosing and treating various dental and orthodontic conditions.

    Purpose of the Study:

    • To compare occlusal forces between individuals with long facial morphology and those with normal facial dimensions.
    • To evaluate occlusal forces during different functional activities, including swallowing, simulated chewing, and maximum effort.
    • To investigate the effect of molar separation on occlusal force measurements.

    Main Methods:

    • Utilized quartz- and foil-based piezoelectric force transducers to measure occlusal forces.
    • Recruited two groups of participants: 19 with long-face morphology and 21 with normal vertical facial dimensions.
    • Measured forces at two molar separation distances: 2.5 mm and 6.0 mm.

    Main Results:

    • Individuals with long faces demonstrated significantly reduced occlusal forces across all tested conditions (maximum effort, simulated chewing, swallowing) compared to the normal group.
    • No statistically significant differences in occlusal forces were found between the 2.5 mm and 6.0 mm molar separation distances for either participant group.
    • The findings highlight a clear correlation between long facial dimensions and diminished occlusal force capacity.

    Conclusions:

    • Long facial morphology is associated with weaker occlusal forces, impacting masticatory efficiency.
    • The degree of molar separation within the tested range does not appear to be a significant factor in differentiating occlusal force capabilities between these groups.
    • These findings have implications for understanding functional differences in individuals with varying facial types and may inform treatment strategies in orthodontics and restorative dentistry.

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