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Relationship between mandible fractures and third molars.
Yunhae Lee1, Jeenam Kim1, Myungchul Lee1
1Department of Plastic and Reconstructive Surgery, Konkuk University Medical Center, Seoul, Korea.
Archives of Craniofacial Surgery
|January 9, 2020
Summary
The presence of third molars (M3) increases the risk of mandibular angle fractures but lowers the risk of condyle fractures. A lower bony area ratio may predict fracture patterns.
Area of Science:
- Oral and Maxillofacial Surgery
- Dental Traumatology
- Radiology
Background:
- Mandibular fractures are common injuries.
- The role of third molars (M3) in mandibular fractures requires further investigation.
Purpose of the Study:
- To determine the relationship between third molars (M3) and mandibular angle or condyle fractures.
- To evaluate the predictive value of the true mandibular angle bony area ratio for fracture patterns.
Main Methods:
- Retrospective analysis of 129 patients with unilateral mandibular fractures (2008-2018).
- Review of medical records for fracture location and panoramic radiographs for M3 presence and position.
- Calculation of the true mandibular angle bony area ratio (Area A-B/Area A x 100).
Main Results:
- The risk of angle fracture was higher with M3 presence (OR 2.2) and lower with condyle fracture (OR 0.45).
- Impacted M3 increased angle fracture risk (OR 0.3) and decreased condyle fracture risk (OR 3.32) compared to erupted M3.
- Angle fractures showed significantly lower true mandibular angle bony area ratios than condyle fractures (p=0.003).
Conclusions:
- The true mandibular angle bony area ratio is significantly lower in angle fractures compared to condyle fractures.
- This ratio offers a simple, inexpensive method for predicting mandibular fracture patterns.
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