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[The mandibular angle in the orthopantomogram].

H Fischer-Brandies, E Fischer-Brandies, E Dielert

    Der Radiologe
    |December 1, 1984
    PubMed
    Summary
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    Orthopantomograms allow reproducible gonial angle measurement, with a 1-degree variation found between routine exams. However, lateral cephalometric radiographs are preferred for accurate gonial angle determination due to smaller measured values.

    Area of Science:

    • Dentistry
    • Radiology
    • Anatomy

    Background:

    • The gonial angle is a key anatomical landmark in dentistry and orthodontics.
    • Accurate measurement of the gonial angle is crucial for diagnosing and planning treatment.

    Purpose of the Study:

    • To evaluate the reproducibility of gonial angle measurements using orthopantomograms.
    • To compare gonial angle values obtained from orthopantomograms with those from lateral cephalometric radiographs.

    Main Methods:

    • Orthopantomograms were taken for patients during routine clinical examinations.
    • Gonial angle measurements were performed on two separate orthopantomograms from the same patient.
    • Measurements were compared to those obtained from lateral cephalometric radiographs.

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    Main Results:

    • Orthopantomograms demonstrated reproducible gonial angle measurements with a mean variation of 1 degree.
    • Gonial angle values measured via orthopantomogram were consistently smaller (2.2 to 3.6 degrees) than those from lateral cephalometric radiographs.
    • Some single cases exhibited wider variations in measurements.

    Conclusions:

    • While orthopantomograms offer reproducible gonial angle measurements, lateral cephalometric radiographs are considered more accurate for clinical determination.
    • The systematic underestimation of the gonial angle in orthopantomograms necessitates caution when using this modality for precise angular measurements.