The radiological assessment of ectopic lower third molars

Area of Science:

• Dentistry
• Oral Surgery
• Radiology

Background:

• Predicting surgical difficulty for impacted lower third molars is crucial for patient outcomes.
• Assessing the risk of nerve injury during extraction is a significant concern.

Purpose of the Study:

• To evaluate the efficacy of orthopantomography in predicting the time required for impacted lower third molar removal.
• To assess the utility of orthopantomography in predicting postoperative labial nerve sensation impairment.
• To compare orthopantomography with other radiographic techniques for these predictive purposes.

Main Methods:

• Experiments involved observers of varying experience levels assessing orthopantomograms.
• Radiographs were used to predict extraction time and potential nerve risk.
• Comparison was made with lateral oblique and intraoral views.
• Statistical analysis, including multiple regression, was attempted but ultimately a points scoring method was developed.

Main Results:

• Orthopantomography satisfactorily predicted the time for removing specific ectopic lower third molars.
• The orthopantomograph performed comparably to the lateral oblique view for predicting extraction time.
• The orthopantomograph showed potential in identifying cases with clear nerve risk or no risk, though some ambiguity remained.
• A simple points scoring system proved effective for prediction and was usable by less experienced observers.

Conclusions:

• Orthopantomography is a valuable tool for predicting the surgical difficulty of impacted lower third molar extractions.
• It aids in assessing the risk to the inferior alveolar nerve, though supplementary intraoral views may clarify ambiguous cases.
• A developed points scoring method enhances the practical application of radiographic assessment for surgical planning.