中华整形外科杂志
中華整形外科雜誌
중화정형외과잡지
CHINESE JOURNAL OF PLASTIC SURGERY
2008年
5期
353-356
,共4页
体层摄影术,螺旋计算机%骨松质%骨皮质%下颌支矢状骨劈开术
體層攝影術,螺鏇計算機%骨鬆質%骨皮質%下頜支矢狀骨劈開術
체층섭영술,라선계산궤%골송질%골피질%하합지시상골벽개술
Tomograpby,spiral computed%Cancellous bone%Cortical plate%Sagittal split osteotomy of ramus
目的 用CT扫描的方法来描述下颌支骨松质分布和骨皮质厚度变化情况,以此来估计下颌支矢状骨劈开术舌侧骨切开的位置、深度和方向.方法 45例实施下颌支矢状骨劈开术的骨性Ⅲ类下颌前突患者,术前进行上下颌骨CT扫描.从下颌小舌平面开始每隔2.5mm为一层面进行测量,向上20 mm,在每一层面测量骨皮质的厚度和骨松质的分布情况.结果 下颌支上部骨松质分开的占37.5%,骨松质在任何一层均未分开的占62.5%.在下颌小舌上5 mm平面,舌侧骨皮质的厚度从前向后逐渐变薄,平均厚度1.55 min,下颌小舌距离升支后部骨皮质融合处的平均距离为9.45mm.结论 舌侧骨切开应位于下颌小舌上5mm以内的区域,在下颌小舌后方9.45 mm以内切开,骨切开线由后向前可轻度向下,切开深度2 mm左右,向前逐渐加深.
目的 用CT掃描的方法來描述下頜支骨鬆質分佈和骨皮質厚度變化情況,以此來估計下頜支矢狀骨劈開術舌側骨切開的位置、深度和方嚮.方法 45例實施下頜支矢狀骨劈開術的骨性Ⅲ類下頜前突患者,術前進行上下頜骨CT掃描.從下頜小舌平麵開始每隔2.5mm為一層麵進行測量,嚮上20 mm,在每一層麵測量骨皮質的厚度和骨鬆質的分佈情況.結果 下頜支上部骨鬆質分開的佔37.5%,骨鬆質在任何一層均未分開的佔62.5%.在下頜小舌上5 mm平麵,舌側骨皮質的厚度從前嚮後逐漸變薄,平均厚度1.55 min,下頜小舌距離升支後部骨皮質融閤處的平均距離為9.45mm.結論 舌側骨切開應位于下頜小舌上5mm以內的區域,在下頜小舌後方9.45 mm以內切開,骨切開線由後嚮前可輕度嚮下,切開深度2 mm左右,嚮前逐漸加深.
목적 용CT소묘적방법래묘술하합지골송질분포화골피질후도변화정황,이차래고계하합지시상골벽개술설측골절개적위치、심도화방향.방법 45례실시하합지시상골벽개술적골성Ⅲ류하합전돌환자,술전진행상하합골CT소묘.종하합소설평면개시매격2.5mm위일층면진행측량,향상20 mm,재매일층면측량골피질적후도화골송질적분포정황.결과 하합지상부골송질분개적점37.5%,골송질재임하일층균미분개적점62.5%.재하합소설상5 mm평면,설측골피질적후도종전향후축점변박,평균후도1.55 min,하합소설거리승지후부골피질융합처적평균거리위9.45mm.결론 설측골절개응위우하합소설상5mm이내적구역,재하합소설후방9.45 mm이내절개,골절개선유후향전가경도향하,절개심도2 mm좌우,향전축점가심.
Objective To investigate significance of the distribution and thickness of cancellous and cortical hone in the mandibular ramus using computed tomography(CT) in the design of osteotomy at the medial aspect of the ramus.Methods 45 cases with class Ⅲ prognathism underwent CT before operation.The distribution and thickness of cancellous and cortical hone in the mandibular ramus was measured every 2.5 mm thick from mandibular lingnlar plane to 20 mm above it.Results The upper ramus was separated by cancellous bone in only 37.5 % of the eases.The other cases had no cancellous bone in the upper ramus.5 mm above the lingual,the thickness of cortical hone at the lingual aspect decreased from the front to the behind with an average thickness of 1.55 mm.The distance from lingual to the fusion at the posterior border of ramus was 9.45 mm.Conclusions The medial cortical osteotomy should be located within 5 mm above the lingual and within 9.45 mm posterior to the lingular.The osteotomy could be slightly oblique and become deeper from behind to the front with an average depth of about 2 mm.
