Relationship between fracture of mandibular condyle and absence of unerupted mandibular third molar-a retrospective study.

Abstract

The purpose of the present study was to find, if there exists, a co-relation between presence of unerupted mandibular third molar and fracture of mandibular condyle. A retrospective, multicenter study was done collecting the data of all mandibular condyle fractures treated from November 2006 till August 2015. Data was collected from the patient's records and radiographs for the following information: age, sex, etiology of fracture, presence and state of lower third molars, and associated fracture. The results were subjected to statistical analysis. Out of 180 patients of condylar fracture, unerupted third molars were present in 35 (19.44%) cases compared to 145 (80.55%) cases of condylar fracture where the unerupted third molars were not present. The difference was statistically significant (p<0.05). In the unerupted third molar present group, isolated bilateral condylar fracture was seen in 4 (11.4%) cases, bilateral condylar fracture associated with other mandibular fractures in 9 (25.7%) cases, isolated unilateral condylar fracture in 0 (0.0%) cases, and unilateral condylar fracture associated with other mandibular fractures in 17 (48.5%) cases and condylar fracture associated with mid face fractures in 5 (14.2%) cases. In the unerupted third molar absent group, isolated bilateral condylar fracture was seen in 5 (3.4%) cases, bilateral condylar fracture associated with other mandibular fractures in 30 (20.6%) cases, isolated unilateral condylar fracture in 24 (16.5%) cases, unilateral condylar fracture associated with other mandibular fractures in 73 (50.34%) cases, and condylar fracture associated with mid face fractures in 13(8.96%) cases. The difference between the groups was statistically significant (p=0.032). This study suggests that the fractures of mandibular condylar region have a significantly higher incidence in patients without an unerupted mandibular third molar.