A STUDY OF THE TEMPOROMANDIBULAR JOINT IN MALOCCLUSI0N USING TMJ TOMOGRAM AND
CEPHALOGRAM
Soon Chang Hong
Department of Dental Science, Graduate School, Yonsei University
(Directed Young Kyu Ryu, D.D.S., Ph.D.)
The purpose of this study was to investigate the difference between normal and
malocclusion subjects in Temporomandibular joint. This study was based on the 44
subjects with normal occlusion, 30 subjects with ClassⅡ malocclusion, 30 subjects
with ClassⅢ malocclusion before treatment.
After submental vertex view analysis, each subject was given the TMJ Tomogram in
centric relation and centric occlusion and the Cephalogram was taken with Quint
Sectograph. The TMJ spaces were measured and analyzed statistically. Following
results were obtained.
1. When centric relation was compared to centric occlusion, The condyles were
positioned more posteriorly and superiorly in centric relation position of the
normal occlusion group and the classⅡ malocclusion group. In the ClassⅢ
malocclusion group. There was no significant difference in the condylar position
between centric occlusion and centric relation.
2. The condyles of the ClassⅢ malocclusion group were positioned more superiorly
than the normal occlusion group and the ClassⅡ malocclusion group.
3. In the correlation between articular eminence posterior slope angle and
lingual slope angle of the upper anterior central incisor, there was significant
correlation in the normal occlusion group. But no significant correlation was found
in the malocclusion group.
4. The mean value of the horizontal angulation of condylar head to the transear
rod axis plane was 20.32°±8.12° in the normal occlusion group, 25.08°±4.83°
in the classⅡ malocclusion group, 14.68°±4.08° in the classⅢ malocclusion
group.
[영문]
The purpose of this study was to investigate the difference between normal and malocclusion subjects in Temporomandibular joint. This study was based on the 44 subjects with normal occlusion, 30 subjects with ClassⅡ malocclusion, 30 subjects
with ClassⅢ malocclusion before treatment.
After submental vertex view analysis, each subject was given the TMJ Tomogram in centric relation and centric occlusion and the Cephalogram was taken with Quint Sectograph. The TMJ spaces were measured and analyzed statistically. Following results were obtained.
1. When centric relation was compared to centric occlusion, The condyles were positioned more posteriorly and superiorly in centric relation position of the normal occlusion group and the classⅡ malocclusion group. In the ClassⅢ malocclusion group. There was no significant difference in the condylar position
between centric occlusion and centric relation.
2. The condyles of the ClassⅢ malocclusion group were positioned more superiorly than the normal occlusion group and the ClassⅡ malocclusion group.
3. In the correlation between articular eminence posterior slope angle and lingual slope angle of the upper anterior central incisor, there was significant correlation in the normal occlusion group. But no significant correlation was found
in the malocclusion group.
4. The mean value of the horizontal angulation of condylar head to the transear rod axis plane was 20.32°±8.12° in the normal occlusion group, 25.08°±4.83° in the classⅡ malocclusion group, 14.68°±4.08° in the classⅢ malocclusion group.