Abstract
Clinical and radiographic examinations were made of 60 children with jaw fractures which we treated in the past 17 years. Follow-up examinations were made of 33 of these 60 patients. The results obtained are as follows:
Clinico-roentgenographically,
1) Traffic accidents were the chief cause of jaw fractures.
2) Of these 60 children, there were about 3 times as many boys as girls.
3) Five to six-year-old children experienced jaw fractures most frequently.
4) Some changes were observed in likely sites of fracture by age-groups, however, so far as the condylar fracture is concerned, all age-groups experienced such fracture frequently.
5) From the therapeutic viewpoint, many of fractures in the horizontalramus were treated by the conservative technique, and all of the cases with only fracture of the mandibular condyle were so treated.
From the viewpoint of follow-up examinations,
1) Root malformations were observed in 6 of 28 permanent teeth germs present on the line of fracture just suffered.
2) Of these 6 teeth germs, 4 were cases where open reduction was performed at the same sites. In all cases, malformation occurred on simple rooted teeth, and 5 teeth were found unfinished in preparation of crown.
3) Morphological abnormality of the mandibular condyle was observed in 3 of 13 fracture of mandibular condyle cases.
4) However, no jaw underdevelopment and/or joint dysfunctions were observed.
