악교정수술을 받은 III급 부정교합자의 치료 전, 후의 하악치열궁 변화
Changes of mandibular dental arch during surgical-orthodontic treatment in skeletal class III malocclusion individuals
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본 연구는 악교정수술을 받은 골격성 III급 부정교합자의 치료 전, 후의 하악치열궁 변화를 관찰하고, 이들이 초진 시의 측모두부방사선 규격사진 및 석고모형과 어떠한 상관성을 가지고 있는지를 알아보기 위해 골격성 III급 부정교합자로 진단받은 31명(남자 14명, 여자 17명, 평균 21.8 ± 3.3세)을 대상으로 치료 전, 악교정수술 전, 악교정수술 후 채득한 측모두부방사선 규격사진과 치료 전, 후의 석고모형을 계측하여 상관분석과 회귀분석을 시행하였다. 연구 결과 Mn-LMMC, Mn-LIE, Mn-MnOcc는 술전교정치료에 의한 유의한 차이를 보이지 않았다. 치료 전의 계측치와 치료 후 변화된 계측치와의 상관관계에서는 치열궁공간부족(ALD)은 ICW, IPW1의 변화량과 순상관관계(r = 0.492, 0.615)를 보였으며, 치열궁장경(arch length)의 변화량과도 순상관관계(r = 0.641)를 보였다. 그러나 Spee 만곡은 전치부 치축 각도 변화와 치열궁 폭경 및 장경 등 각각의 변화량과는 상관관계를 보이지 않았다. 이를 이용하여 회귀분석을 시행한 결과, 술전교정 후 Arch length, IPW1의 변화량은 치료 전의 계측치로 각각 64.0%, 75.8%를 설명할 수 있었다. 이상의 연구에서 골격성 III급 부정교합자의 치료 전, 후의 변화량과 치료 전 측모두부방사선 규격사진 및 석고모형 간에 관련성이 있었고 악교정수술을 동반한 교정치료 계획을 수립할 때 술전교정치료의 목표 설정과 악교정수술 결과의 예측에 도움이 될 것으로 판단된다. (대치교정지 2008;38(4):283-298)
Abstract
The purpose of this study was to investigate changes in the mandibular dental arch from presurgical orthodontic treatment and orthognathic surgery, and to evaluate the relationships between the pretreatment records and changes of mandibular dental arch in skeletal Class III malocclusion individuals. Methods: Lateral cephalometric radiographs and mandibular study models of 31 adults with skeletal class III malocclusion were taken and measured. All measurements were evaluated statistically by ANOVA, Scheffe's Post Hoc, and paired t-test, and correlation coefficients were evaluated. Results: No significant difference in Mn-LMMC, Mn-LIE, Mn-MnOcc was detected between pretreatment and presurgical groups. Statistically significant but low correlations were demonstrated between the initial arch length discrepancy (ALD) and change in ICW, IPW1 (r = 0.492, 0.615) and change in arch length (r = 0.641). No association was seen between the initial depth of curve of Spee and change in mandibular incisor angle and arch width or arch length. Regression analysis showed that the amount of change for arch length and IPW1 could be explained by 64.0% and 75.8% of the pretreatment variables respectively. Conclusions: This study suggests that orthognathic surgery results can be predictable by measuring the pretreatment records. (Korean J Orthod 2008;38(4):283-298)
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