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KMID : 0378019710140120089
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New Medical Journal
1971 Volume.14 No. 12 p.89 ~ p.98
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Cllinico-Roentgenographic Studies on Fracture Lines of the Mandible
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Abstract
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Although many studies on various phases of mandibular fractures have been presented, many still netd to be made before there can be a full understanding of this complex problem.
The author has analyzed fracture locations, age distributions and types of fractures with special emphasis laid on the inclinations of those fracture lines of mandible.
The data for this study were compiled from 79 cases of mandibular fractures treated at the dental department of St. Mary´s Hospital, Catholic Medical College and of National Medical Center in Seoul between 1969 and 1970.
Results obtained are as follows:
1. The symphysis region was most commonly fractured(44.3%), while the most frequent were fracture lines passing between the left lateral incisor and canine (16 fractures). The right and left side were in the ratio 50:72.
2. Frequency of the fractures was the highest in age group of the third decade(40.6%), and males
(63 fractures) were involved four times as frequntly as females(16 fractures).
3. The two major etiologic factors were traffic accidents(38.0%) and fist fights(30.4%).
4. Single fractures were seen in 51.9 per cent, while double and triple ones in 43.0 and 6.3 per cent
of the present series respectively.
5. The double fractures most frequently seen involved the symphysis region of one side and the opposite angle(36.4%).
And the two cases (40.0%) of the 5 triple fractures had a unilateral chin region and both condylar regions as the fracture sites.
6. The inclinations of fracture lines showed wider angles in the right side than in the left. And the more posteriorly fracture sites located, the sharper the angles were. In 3 different types of fracture, single type showed the highest gradient and triple the lowest.
7. The fracture lines were directed obliquely down and backward(86.1%), vertically oriented(7.3%), and obliquely down and forward(6.6%).
8. 78.3 per cent of fracture lines in the angle region were associated with the lower third molar tooth. And there were more fracture lines passing distally(72.2%) than mesially(27.8%) to the wisdom tooth. 9. Fractures of the symphysis and body were the most common in single types of fracture and the least in triple types.
To the contrary, the condyloid process showed the highest frequency of fractures in triple types and the lowest in single types.
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