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안면골격 유형에 따른 하악 전치 치조골의 형태 차이

안면골격 유형에 따른 하악 전치 치조골의 형태 차이
Other Titles
Morphological difference of symphysis according to various skeletal types using cone-beam computed tomography
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임상치의학대학원 임상치의학과임상교정치의학전공
이화여자대학교 임상치의학대학원
The aim of this study was to investigate a correlation between the morphology of the mandibular anterior alveolar bone and four facial skeletal types in orthodontically untreated adults. From the samples of 658 digital volumetric tomographys (Cone-beam CT), 40 subjects including 7 males and 33 females between 18 and 46 years old were selected while patients under the age of 18, orthodontically treated, with severe crowding (Little’s irregularity 6 over) or missing tooth and non-average(<90, 102<) of IMPA angle were excluded. According to the ANB angle (ClassⅠ: 0-4˚, ClassⅡ: 4˚ over) and SN-mandibular plane angle (low angle: 25-32˚, high angle: 38-49˚), the subjects were classified under 4 groups as ClassⅠ low angle, ClassⅠ high angle, ClassII low angle and Class II high angle with 10 subjects in each group. Tomography was carried out using Dinnova (Willmed, Seoul, Korea) and 3D analysis was carried out by OnDemand 3D (CybermedInc., Seoul, Korea). The bone volume(㎣) of the mandibular incisor bony support and the following parameters were measured on the sagittal sections corresponding to the 4 mandibular incisors’ axis: the cross sectional area of total bone(㎟), the area of the cancellous bone(㎟) and the thickness(㎜) of labial and lingual alveolar bone at 2㎜, 3㎜ under the CEJ(cemento-enamel junction). GLM, Kruskal-Wallis test and Tukey HSD test were subsequently implemented to determine a correlation. The lingual cortical bone thickness of the lateral incisors at 2, 3㎜ under CEJ was greater in the ClassⅠ low angle group than other 3 groups (p<0.05). No statistically significant differences by facial types were found in the volume of the mandibular incisor bony support, cross-sectional area of total alveolar bobe and cancellous bone area at the mandibular incisor axis(p>0.05). The result of this study found that there was a statistically significant relationship between facial skeletal types and the thickness of lingual mandibular incisor bony support. Patients in ClassⅠ, low angle group have a thicker lingual mandibular incisor bony support than ClassⅡ, high angle patients.;본 연구는 수평적, 수직적 안면 골격 유형에 따른 하악 전치부 치조골의 형태학적 차이를 알아보기 위하여 시행하였다. 이대목동병원 교정과를 내원한 환자 중 2011년 2월부터 2012년 4월까지 Cone-beam computed tomography(Cone-beam CT)를 촬영한 환자 658명을 대상으로 하였다. 그 중에서 만 18세 이하, 교정 치료를 받은 환자, 하악 전치부위에 과밀이 심한 환자(Little’s irregularity 6이상), 결손치아가 있는 환자, IMPA가 평균 크기(900.05). 하악 측절치 설측 치조골 두께가 Ⅰ급 하악 평면각이 작은 군이 나머지 3군 보다 두꺼웠으며, Ⅰ급 군이 Ⅱ급 군보다, 하악 평면각이 작은 군이 하악 평면각이 큰 군보다 두꺼웠고, 수평적 안면골격보다 수직적 안면골격이 하악 전치 설측 치조골 두께와 연관이 깊었다. Ⅰ급, 하악 평면각이 작은 환자가 아닌 Ⅰ급 하악 평면각이 큰 군, Ⅱ급 하악 평면각이 작은 군, 하악 평면각이 큰 군인 경우 하악 전치 후방 이동시 하악 전치 설측 치조골의 두께에 주의해야 할 것으로 사료된다.
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