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KMID : 0361919830130020201
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Korean Journal of Orthodontics
1983 Volume.13 No. 2 p.201 ~ p.204
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A STUDY ON CALCIFICATION OF THE SECONG MOLARS IN ANGLE CLASS I MALOCCLUSION
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Abstract
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The purpose of orthodontic treatment is to produce functional occlusion and to create or maintain facial esthetic harmony. The soft-tissue covering of the_ face also plays an important´ role in facial esthetics, speech and other physiologic functions. The study of the soft-tissue profile
.Js important for the planning of orthodontic treatment.
The author studied cephalometric X-ray films on 49 patients (23boys, 26 girls) with Angle´s class II .division 1 malocclusion, ranged from 9 to 13 years -of age..Roentgenocephalmetric X-ray films were taken pre and post orthodontic came. Tracings were made in usual manner.
The obtained results were as follow.
1. ´ There was rio significant sexual difference on mean changes.
2. In the comparison of the soft tissue thickness changes, Ls-Ls´ and Si-Si´ in male subjects were remarkable.
3. There were significant correlations between osseous (S ´) change and soft-tissue (Ss) change of
maxilla in male and female subjects subsequent to orthodontic treatment.
4. The ratios between the protraction of the Ss´ and that of the Ss were 1:1.5 in all sexes, the
ratios between the Si´ and that of the Si were 1:1.4 in male and 1:1.2 in female.
5. There were significant correlations between maxillary central incisor angulation change (L A)
and upper lip inclination change (L B) in all sexes.
6. There were little correlations between change in distance difference of Is and Ii and change in distance difference of Ls and Li in all sexes.
in all sexes.
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