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Related Experiment Videos

Reliability and validity of lower third molar space-assessment techniques.

R Olive, K Basford

    American Journal of Orthodontics
    |January 1, 1981
    PubMed
    Summary

    Orthodontic assessments of lower third molar impaction are most reliable using rotational tomograms (O.P.G.s) to measure the Space Width Ratio. Lateral cephalograms and the Xi point method proved unreliable for predicting impaction.

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    Area of Science:

    • Dentistry
    • Oral and Maxillofacial Surgery
    • Radiology

    Background:

    • Predicting lower third molar eruption or impaction is crucial for treatment planning.
    • Current methods rely on measuring the space between the second molar and the ramus.
    • Radiographic techniques are commonly employed for this assessment.

    Purpose of the Study:

    • To evaluate the reliability and validity of different radiographic techniques for assessing the space available for lower third molars.
    • To compare the accuracy of rotational tomograms (O.P.G.s) and lateral cephalograms.
    • To determine the efficacy of the Xi point method.

    Main Methods:

    • Direct measurements on dried skulls were used as a gold standard.
    • Radiographic measurements from O.P.G.s and lateral cephalograms were compared to direct measurements.

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  • The Space Width Ratio (available space divided by mesiodistal width of the lower third molar) was calculated.

    • Main Results:

    • Rotational tomograms (O.P.G.s) provided the most accurate estimates of the Space Width Ratio.
    • Measurements from lateral cephalograms were found to be unreliable.
    • The use of the Xi point to the lower second molar was not supported as a valid assessment method.

    Conclusions:

    • Rotational tomograms (O.P.G.s) are the preferred radiographic method for assessing the space for lower third molars.
    • Lateral cephalograms and the Xi point method should not be relied upon for predicting impaction.
    • Accurate assessment of space is vital for predicting lower third molar eruption and impaction.