To investigate the relationship of skeletal maturity among the normal occlusion group and each malocclusion groups, the author used hand and wrist X-ray of 133 Korean 13 year old boys (normal occlusion 30, Class I malocclusion 35, Class II malocclusion 35 and Class III malocclusion 33) and assessed their skeletal maturity. In this study, fourteen skeletal maturity stages were selected from, Radius, Hamate, Pisiform, Ulnar sesamoid of the metacarpophalangeal joint of the first thumb, proximal phalanges of the first, second and third finger, middle and distal phalanx of the third finger. The difference of skeletal maturity of each malocclusion groups in relative to normal occlusion group and that of each malocclusion groups were analyzed.
The findings of this study can be summerized as follows:
1. Average skeletal maturity stage of each groups were MP3 cap stage in normal occlusion group, H,:2-stage in Class I malocclusion group, midstage between S and 1-1-2 stage in Class II malocclusion group, MP3 cap stage in Class III malocclusion group.
2. There was no significant difference in skeletal maturity of Class I malocclusion and Class III malocclusion groups in relative to normal occlusion group.
3. , There was significant retardation of skeletal maturity in Class II malocclusion group in relative to normal occlusion group.
4. There was no significant difference in skeletal maturity between Class I and Class II malocclusion groups.
5. There was no significant difference in skeletal maturity between Class I and Class III malocclusion groups. ,
6. There was significant retardation of skeletal maturity in Class II malocclusion group in relative to Class III malocclusion group.
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