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KMID : 0355619920180030044
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Journal of Korean Association of Oral and Maxillofacial Surgeons
1992 Volume.18 No. 3 p.44 ~ p.53
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A comparative study of maxillary and mandibular length : normal children, children treated by chin cap andnormal adult, class III adult treated by orthognatic surgery
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Abstract
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It has been known that class Ⅲ malocclusion has various etiologic factors and characteristic maxillomandibular and dental relation. The treatment of class Ⅲ malocclusion is divied two type by treatment timing: early orthopedic treatment and
late
surgico-orthodontic treatment.
Nowadays, it is popular for the surgerns to use the combination of orthodontic treatment and orthognatic surgery. To study the timing of treatment of growing skeletal class Ⅲ children, we selected normal 30 male, 30 female children and skeletal
class
Ⅲ 15 male children, 15 female children and skeletal Ⅲ 29 adult male, 29 adult female.
Cephalometric radiograph was treated by single investigator and maxillary, mandibular length was measured.
@ES The results were as follows;
@EN 1. The maxillary length of normal group in both children and adults were larger than malocclusion group in statistically level (p<0.001).
2. The mandibular length class Ⅲ malocclusion group in female children and adult is larger than normal group in statistically significant level (adult: p<0.01, female children: p<0.001).
3. Max/mand. ratio were 0.73 in class Ⅲ male children, 0.71 in female children and 0.66 in class Ⅲ male adult 0.67 in class Ⅲ feamle.
4. Difference of maxillary and mandibular length were 29.06mm in class Ⅲ male children, 29.96mm in female children and 47.19 mm in class Ⅲ male adult, 42.06 mm in class Ⅲ female adult.
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KEYWORD
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