摘要
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20mm，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5mm平面，舌侧骨皮质的厚度从前向后逐渐变薄，平均厚度1．55mm，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9．45mm以内切开，骨切开线由后向前可轻度向下，切开深度2mm左右，向前逐渐加深。
Objective To investigate significance of the distribution and thickness of cancellous and cortical bone 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 bone in the mandibular ramus was measured every 2.5 mm thick from mandibular lingular plane to 20 mm above it. Results The upper ramus was separated by cancellous bone in only 37.5% of the cases. The other cases had no cancellous bone in the upper ramus. 5 mm above the lingual, the thickness of cortical bone 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.
出处
《中华整形外科杂志》
CAS
CSCD
北大核心
2008年第5期353-356,共4页
Chinese Journal of Plastic Surgery
关键词
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
Tomography, spiral computed
Cancellous bone
Cortical plate
Sagittal split osteotomy of ramus
