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KMID : 0361920030330060475
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Korean Journal of Orthodontics
2003 Volume.33 No. 6 p.475 ~ p.483
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hard and soft tissue profile changes following anterior subapical osteotomy in bimaxillary dentoalveolar protrsion patients
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Un Ae Han/한언예
Kim, Jeong Hwan/Yoon, Tae Ho/Park, Je Uk/Kook Yoon Ah/김정환/윤태호/박제억/국윤아
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Abstract
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The purpose of this study is to evaluate hard and soft tissue changes following the first four premolar extractions and anterior subapical osteotomy in bimaxillary dentoalveolar protrusion patients requiring maximal retraction of anterior segments. A sample of 20 adult female patients was selected. Surgical procedures were performed by the same surgeon, and modified segmental osteotomy and anterior subapical osteotomy techniques were employed on the maxilla and mandible respectively. Pre-surgical and post-surgical lateral cephalometric radiograms were traced and superimposed using the best-fit method and two reference planes.
The results were as follows
1. The bodily movement of, the maxillary anterior segment was achieved in a posterior direction. The mandibular anterior segment was moved posteriorly with a slight correction of the lower incisors.
2. The horizontal soft tissue measurements changed significantly after treatment, but Nt and Sn landmarks remained unchanged. The
vertical soft tissue measurements indicated that Ls moved inferiorly and Li superiorly.
3. The correlation between hard and soft tissue changes indicated that d Hld/ dHLi, d IIId/ A LL-Eline, d HPt.B/ d HILS, and J UI-FH/
dNL were significant.
4. More lower lip relative to upper lip retraction was demonstrated in relation to Ricketts E-line. The ratio between upper incisor and upper lip displacement was 50%, and between the lower incisor and lower lip displacement was 60%.
We conclude from the results that the anterior subapical osteotomy is an efficient treatment option for adult patients who have severe dentoalveolar protrusion and desire rapid results.
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