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Prognosis of third molar eruption

C Ganss¹, W Hochban, A M Kielbassa

¹Medizinisches Zentrum für Zahn-, Mund- und Kieferheilkunde, Philipps-Universität Marburg.

Oral Surgery, Oral Medicine, and Oral Pathology

|December 1, 1993

Summary

This study identified key measurements on dental imaging to predict third molar eruption. Sufficient retromolar space on rotational tomograms or lateral cephalometric radiographs indicates a higher likelihood of wisdom tooth eruption.

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Area of Science:

Dentistry
Radiology
Orthodontics

Background:

Predicting third molar (wisdom tooth) eruption is crucial for treatment planning.
Assessing available space in the retromolar region is a key factor.

Purpose of the Study:

To establish threshold values for predicting third molar eruption using rotational tomograms and lateral cephalometric radiographs.
To compare the efficacy of these radiographic methods in assessing retromolar space.

Main Methods:

Longitudinal study following 27 patients over 7 years.
Measurement of retromolar space at ages 13, 16, and 20 using rotational tomograms and lateral cephalometric radiographs.
Comparison of radiographic measurements with actual third molar eruption and study casts.

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Main Results:

Significantly more retromolar space was observed in patients with erupted third molars at earlier ages.
A space/width ratio >= 1 on tomograms or >= 25 mm on cephalometric radiographs correlated with eruption.
Strong correlation and good reliability were found between the two radiographic methods.

Conclusions:

Rotational tomograms and lateral cephalometric radiographs provide reliable measurements for predicting third molar eruption.
Specific thresholds on these radiographs can indicate an increased probability of wisdom tooth eruption.