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골격성 III급 부정교합자에서 상악골 전진술을 동반한 양악 수술 시 중안면 연조직 형태의 변화

Soft tissue change of the midface in skeletal class III orthognathic surgery patients

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본 연구는 중안면 함몰이 있는 골격성 III급 부정교합자의 중안면의 형태를 정상 표본과 비교하고, 악교정수술에 의하여 연조직이 어떤 변화를 보이는 지를 알아보기 위하여 시행하였다. 골격성 III급 부정교합으로 진단 받고 상악 전진술과 하악 후퇴술을 시행 받은 환자 34명(남자:15명, 여자:19명)을 대상으로 수술 전후 측모 두부방사선 계측사진을 분석하였다. 골격성 III급 부정교합자의 중안면의 경조직 계측치 S'-Or, Or⊥NA, S'Or/SN, ∠SNOr에서 남녀 모두에서 정상 교합자와 큰 차이가 있었다. 상악골이 평균 5.03 mm 전방이동 될 때 연조직 Orbitale는 2.26 mm 전방으로 이동하였으며 상관계수는 0.599였다 (p < 0.05). 상악 평면각의 변화(시계방향으로 회전)와 상악골의 수직이동은 연조직 Orbitale의 전방이동과 유의성있는 상관관계가 없었다. 상악골 전방이동에 대한 연조직 Orbitale와 Subnasale의 전방이동 비율은 각각 43.57%, 81.54%였다. 이상의 결과에서 중안면 함몰이 있는 환자는 상악골 전방이동시 상순과 비부 외에도 연조직 Orbitale를 포함한 중안면 연조직이 전방으로 이동하지만, 상악골의 회전이동 및 수직이동에 대해서는 연조직의 변화량이 적었다는 것을 알 수 있었다. 이는 상악골의 수술에 따른 중안면 함몰의 해소를 예측하는데 도움이 될 것이다. (대치교정지 2008;38(2):83-94)

Abstract

Purpose: The first objective of this study was to compare the upper midface morpholgy, focusing on the soft tissues, between skeletal Class III maloccusion patients with midfacial depression and the norm. The second objective was to estimate and analyze the change in the upper midface soft tissues following surgical correction with maxillary advancement by Lefort I osteotomy and mandibular setback by bilateral sagittal split osteotomy (BSSRO). Methods: The samples consisted of 34 adult patients (15 males and 12 females) with an average age of 21years, who had severe anteroposterior discrepancy with midfacial depression. These patients had received presurgical orthodontic treatment and surgical treatment which consisted of simultaneous Lefort I osteotomy and BSSRO. Results: The correlation coefficient between changes in maxillary advancement and changes in Or' (soft tissue orbitale) was 0.599 (p < 0.05). Change in maxillary plane angle and vertical change of the maxilla were not correlated with the change in Or' (p < 0.05). The ratio of soft tissue change in Or' to maxillary advancement was 43.57 %, and 81.54 % in Sn. Regression equations between maxillary movement and Or' were devised. The r2 value was 0.476. Conclusions: The majority of measurements in the upper midface in skeletal Class III maloccusions when compared to the norm, showed significant differences. In Class III malocclusion with midfacial depression, maxillary advancement produces soft tissue change in the upper midface. (Korean J Orthod 2008;38(2):83-94)

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