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Normal TMJ bony relationships in centric occlusion.

D D Blaschke, T J Blaschke

    Journal of Dental Research
    |February 1, 1981
    PubMed
    Summary
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    This study quantified temporomandibular joint (TMJ) spatial relationships in asymptomatic individuals. Results show condyles are centered, but with significant variation, and minimal correlation between left and right TMJ positions.

    Area of Science:

    • Temporomandibular Joint (TMJ) Disorders
    • Biomechanics
    • Orthodontics

    Background:

    • Understanding the normal spatial relationship between the condyle and temporal bone is crucial for diagnosing temporomandibular joint (TMJ) disorders.
    • Previous assessments often relied on qualitative measures, lacking precise quantitative data on condyle positioning within the joint space.

    Purpose of the Study:

    • To quantitatively determine the spatial relationships between the condyle and temporal bone in asymptomatic temporomandibular joints (TMJs).
    • To assess the degree of condyle centering and the variability of condyle positions within the joint space.

    Main Methods:

    • A preliminary investigation involving 50 asymptomatic TMJs (from 25 subjects) was conducted.
    • Quantitative area measurements of the posterior and anterior portions of the joint spaces were performed.

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  • Condyle-temporal bone spatial relationships were analyzed based on these measurements.

    • Main Results:

    • The condyle was found to be centered in the joint to a very high degree on both right and left sides.
    • Large standard deviations around the mean values indicated greater posteroanterior variation in condyle positions than commonly assumed.
    • A mild correlation was observed between the joint relationships of the right and left sides in individual subjects.

    Conclusions:

    • Asymptomatic TMJs exhibit a high degree of condyle centering.
    • There is significant variability in the posteroanterior positioning of condyles within the TMJ, challenging previous assumptions.
    • The spatial relationship of the right TMJ does not strongly predict the relationship of the left TMJ in the same individual.