Clinical Study on Teeth in the Lines of Mandibular Fractures.

概要

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One hundred forty-six teeth on the fracture lines of mandibular fractures (85 patients) treated at the Department of Oral and Maxillofacial Surgery, Shimane Medical University Hospital, from 1980 to 1998, were clinicostatistically analyzed. The results were as follows: 1. The age of patients was widely distributed. The peak incidence was the second and third decades (74.1%). The male and female ratio was 4 to 1. 2. The cause of fracture was 26 cases (30.6%) in the traffic accident, 21 cases (24.1%) in falls, 17 cases (20.0%) in sports, 10 cases (11.7%) in beating, 9 cases (10.6%) in work accidents and 2 cases (2.4%) in others. 3. Teeth on the lines of mandibular fractures were found in 35 teeth (20.4%) in the wisdom teeth and in 34 teeth (23.4%) in the canine teeth and in 77 teeth (56.2%) in the others. 4. Seventy-three teeth (85.6%) out of all teeth were preserved without teeth extractions. 5. Teeth on the mandibular fracture lines could be classified into four types (I-IV) according to our original classification ; type I was 19.2%, type II was 49.4%, type III was 19.2%, and type N was 12.2%. 6. We investigated whether the teeth on the lines of the mandibular fractures were preserved or not after treatments-91.3% of the teeth had been preserved for more than one year after treatments.
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