유치열기 정상교합아동의 측모두부방사선 계측연구
Study on lateal cephalogram of childen with normal occlusion in the primary dentition
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초록
본 연구의 목적은 유치열기 부정교합의 진단자료로 사용할 수 있는 정상 계측치를 알아보는 것이다. 4세에서 6세 사이 유치열기 정상교합아동 32명의 측모두부방사선 계측사진 및 안모사진을 이용하여 악골 및 연조직의 전후방적, 수직적 관계를 분석하였다. 수평적인 골격성 계측항목 중 SNA는 83°, SNB는 78.72°, ANB는 5.28°를 나타내어 하악골이 상악골에 비해 후방에 위치하고 있었으며 수직적인 골격성 계측항목 중 Gonial angle은 127°를 나타내어 성인에 비하여 High angle pattern을 보였다. 연조직 분석에서는 성인에 비해 convex한 soft tissue profile이 관찰되었다. 치성 계측항목 중 U1 to SN은 91.04°, IMPA는 86.57°를 나타내어 성인에 비해 retroclination된 상하악 유중절치가 관찰되었다. 정상교합아동의 골격성분석에서 여자가 남자에 비하여 평균 나이가 많음에도 불구하고 linear measurement는 전제적으로 남자가 여자보다 큰 수치를 보였다.
Abstract
The present study was designed to formulate cephalometric norms of normal occlusion for usage in orthodontic diagnosis of malocclusion in Korean children. Thirty two children, aged 4 to 6, with normal occlusion were chosen for this study. Sagittal and vertical relations were analyzed using lateral cephalogram and clinical photos and the measurements were compared with those of adults. On skeletal sagittal analysis, the mean values of the SNA and SNB angles were 83° and 78.72°. It showed that the mandible was retrognathic and retropositioned in comparison to those of adults. On skeletal vertical analysis, the mean values of the gonial angle was 127°. This showed high angle pattern in children and reduction of gonial angle due to counterclockwise rotation of the mandible is expected with growth. On soft tissue analysis, children showed convex profile, obtuse nasolabial angle. On dental analysis, the mean values of the U1 to SN and IMPA were 91.04° and 86.57°. This showed retroclined upper and lower deciduous teeth in comparison to adults. For skeletal values, the liner values were generally greater in males than females.
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