Roentgenocephalometric study on facial height and occlusal plane inclination in Class I malocclusion group

Kang, Sang Hoon; Nahm, Dong Seok

Abstract

This study was investigated to assess the difference of facial height and occlusal plane inclination between pre and post-treatment in Class I malocclusion group. The subjects consisted of 35 extraction patients and 30 nonextraction patients, and was subdivided into Group I(overbite<0mm), Group II(04mm) in reference to overbite, and adolescent group and adult group in reference to age. Lateral cephalogram was taken with standard method, traced, and digitized for each subject. The computerized statistical analysis was carried out with SAS program. The results were as follows: 1. In both groups of extraction and nonextraction group the anterior facial height increased after orthodontic treatment, but there was no significant difference(p>0.05) between each group. 2. There was no statistical significance in change of occlusal plane inclination in adolescent group, but significant difference(p<0.05) among three subgroup in adult group. 3. In adolescent-extraction and adolescent-nonextraction group there was significant increase of anterior facial height and posterior facial height, and was superior to adult groups in posterior facial height increment. 4. In all groups upper and lower molars were uprighted to occlusal plane. This had statistically significant effect.