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J Korean Acad Pediatr Dent. 2008;35(2): 235-242.
SKELETAL MATURITY AND MANDIBULAR THIRD MOLAR DEVELOPMENT IN CLASS III MALOCCLUSION
Keun-Young Kang, Kyu-Ho Yang, Nam-Ki Choi, Seon-Mi Kim
Department of Pediatric Dentistry, School of Dentistry, Chonnam National University and Dental Research Institute, The second stage of BK21
Corresponding Author: Kyu-Ho Yang ,Tel: 062-220-5476, Email: hellopedo@hanmail.net
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ABSTRACT
The purpose of this study was to investigate the relationship of the skeletal maturity of hand-wrist and the development of mandibular third molar in subjects with class I and class III malocclusion. The subjects used in this study were 304 children(149 boys, 155 girls) with class I malocclusions and 308 children( 153 boys, 155 girls) with class III malocclusions, ranged from 8 to 15 years of age. Hand-wrist radiographs and panoramic radiographs were used to evaluate the stage of skeletal maturity and teeth development. Fishman's method for the skeletal maturity stages of the hand-wrist and new six-developmental-stage method for the calcification stages of mandibular third molars were analyzed. The results were as follows : 1. In subjects with class I and class III malocclusion, skeletal maturity of the hand-wrist occured earlier in females than in males(p<0.05), while the calcification stages of mandibular third molars were no significant gender differences. 2. There were no significant differences between the groups, when comparing the skeletal maturity stages of the hand-wrist and the calcification stages of mandibular third molars between subjects with the class I and the class III malocclusion. 3. The correlation coefficients between the calcification stages of mandibular third molars and the skeletal maturity stages of the hand-wrist in subjects with class I and class III malocclusion showed a high interrelationship(p<0.01). 4. The correlation coefficients between the calcification stages of mandibular third molars and chronological age in subjects with class I and class III malocclusion showed a high interrelationship (p<0.01). As a result, there were no significant differences between class I and class III malocclusion group for skeletal maturity of the hand-wrist and third molar development.
Keywords: Class Ⅲ malocclusion | Skeletal maturity of hand-wrist | Development of mandibular third molar
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MULTIPLE ANKYLOSIS ON MAXILLARY AND MANDIBULAR PRIMARY MOLARS WITHOUT PERMANENT SUCCESSOR  2005 August;32(3)
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