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KMID : 0361920040340020109
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Korean Journal of Orthodontics
2004 Volume.34 No. 2 p.109 ~ p.119
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A study on treatment effects of Class Ⅲ cases by second molar extraction
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이성희/Lee, Sung Hee
박영국/정규림/park, Young Guk/Chung, Kyu Rhim
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Abstract
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This study aimed at investigating the skeletal, dentoalveolar, and soft tissue changes of Class III malocclusion cases treated by -second molar extraction. The lateral cephalograms of 15 subjects with moderate Class In malocclusion by average ANB -1.4° and h\1PA 85° were traced and the computerized superimposition of average craniofacial change was made. The data was gathered and statistically analyzed.
The results were as follows:
1. Lower anterior facial height/anterior facial height increased by 0.6%(P<0.01), mandibular plane increased by 1.5 ° (P<0.05).
2. There was a slightly downward & backward rotation of the mandible.
3. Lower first molar tipped distally by 4.06mm(P<0,001), lower anterior teeth lingually tipped by 32 °(P<0.05). 4. Retracted lower lip improved facial profile.
This study may suggest that second molar extraction could be effective for a moderate Class III malocclusion to make distalization of the lower first molar easier and avoid severe lingual tipping of the lower incisor, if the lower third molar has a normal shape, good direction of eruption and adequate time for lower second molar extraction.
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KEYWORD
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Class Ⅲ malocclusion, Second molar extraction, Treatment effect, lateral cephalograms
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