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目的 测量下颌骨后缘、下颌角、下颌骨下缘骨皮质的厚度,为下颌角缩小术提供解剖学依据.方法 应用多层螺旋CT扫描60例正常青年女性的下颌骨,MPR重建后测量双侧下颌骨后缘、下颌角、下颌骨下缘三段内外板及边缘骨皮质厚度.所得到的结果应用SPSS13.0软件进行分析.结果 左侧下颌骨后缘内外板及边缘骨质厚度分别为(2.1 3±0.29)mm,(2.89±0.35)mm,(4.40±0.66)mm;左侧下颌角内外板及边缘骨质厚度分别为(2.15±0.35)mm,(2.91±0.36)mm,(5.80±1.23)mm;左侧下颌骨下缘内外板及边缘骨质厚度分别为(2.20±0.41)mm,(3.02±0.42)mm,(4.31±0.68)mm.右侧下颌骨后缘内外板及边缘骨质厚度分别为(2.14±0.25)mm,(2.73±0.29)mm,(4.17±0.59)mm;右侧下颌角内外板及边缘骨质厚度分别为(2.25±0.25)mm,(2.76±0.32)mm,(5.60±1.06)mm;右侧下颌骨下缘内外板及边缘骨质厚度分别为(2.40±0.39)mm,(2.99±0.41)mm,(4.15±0.65)mm.双侧下颌骨后缘外板、下颌角外板及下颌骨下缘内板差异具有统计学意义(P<0.05),其余两侧各段骨皮质厚度差异无统计学意义.结论 多层螺旋CT对下颌骨后缘、下颌角、下颌骨下缘骨皮质厚度的测量对下颌角缩小术有重要的临床意义,可确保手术精确实施、降低手术难度、减少手术的并发症.“,”Objective To measure the thickness of cortical bone of the posterior border, the angle and the inferior border of mandible, and provide anatomical basis for plastic surgery. Methods 60 healthy young women undergone mandible MSCT examination, then the multiplanar reconstruction (MPR) was done, followed with the measurement of the exterior, interior and marginal cortical bone thickness of the posterior border, the angle and the inferior border of mandible. The data were analyzed by SPSS13.0. Results The exterior, interior and marginal cortical bone thickness of the left posterior border of mandible were (2.13 ±0.29) mm, (2.89±0.35) mm, and (4.40±0.66) mm; The exterior, interior and marginal cortical bone thickness of the left angle of mandible were (2.15±0.35) mm, (2.91±0.36) mm and (5.80±1.23) mm;The exterior, interior and marginal cortical bone thickness of the left inferior border of mandible were (2.20±0.41)mm, (3.02±0.42)mm and (4.31±0.68)mm respectively. The above parameters of the right were (2.14±0.25)mm, (2.73±0.29)mm and (4.17±0.59)mm; (2.25±0.25)mm,(2.76±0.32)mm and (5.60±1.06) mm;(2.40±0.39)mm,(2.99±0.41)mm and (4.15±0.65)mm respectively. Significant difference can be find among the thickness of exterior cortical bone of bilateral posterior border of mandible, the thickness of exterior cortical bone of bilateral angle, and the thickness of interior cortical bone of the inferior border of bilateral mandible. Conclusions The measurement of cortical bone thickness of the posterior border, the angle and the inferior border of mandible by Multi-slice computed tomography is valuable to reduce the complications during the plastic surgery.