The purpose of this study was to evaluate the compensatory changes of occlusal plane angle in relation to skeletal factors. Lateral cephalograms of 61 normal occlusion adults and 92 malocclusion patients were traced and measured for skeletal factors and occlusal plane angles. Normal occlusion group and malocclusion group were classified into subgr-oups of skeletal Class I, II, and III, and classified into horizontal,. average, and vertical
subgroups, respectively. The measurements were evaluated statistically by ANOVA, Post Hoc, and Paired t-tests.
The results were as follows;
1. Only occlusal plane angle to AB plane showed no significant difference between normal occlusion group and malocclusion group.
2. By the treatment, the occlusal plane angle to AB plane of malocclusion group was approximated to that of normal occlusion group.
3. The LOP to AB plane angle of normal occlusion group was 91.7 in skeletal class I, 88.8 in skeletal class II, and 93.5 in skeletal class III.
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