正常人下颌角形态及其与相邻颅面结构关系的X线头影测量分析

Cephalometric analysis on the morphology of mandibular angle and its relationship with adjoining craniomaxillofacial structures

目的 对正常人下颌角形态及其与相邻颅面结构间的关系进行测量分析 ,并探讨测量结果在下颌角肥大矫正术的术前分析和手术设计中的应用。方法 对 30例健康成年人 (男女各 15例 )正、侧位X线头颅定位片 ,进行以下指标测量 :正位片上的颧突间距、下颌角间距及下颌颏角 ;侧位片上的下颌角、下颌平面 前颅底平面角及升支平面 前颅底平面角。结果 颧突间距男性 (15 6± 5 )mm ,女性(14 6± 5 )mm ;下颌角间距男性 (130± 6 )mm ,女性 (116± 6 )mm ;下颌颏角男性 (12 4± 5 )度 ,女性 (12 6±5 )度 ;下颌角男性 (117± 5 )度 ,女性 (119± 5 )度 ;下颌平面 前颅底平面角男性 (2 7± 5 )度 ,女性 (2 9± 5 )度 ;升支平面 前颅底平面角男性 (94± 5 )度 ,女性 (93± 5 )度。以上各指标测量结果男女间差异具有显著意义。结论 应从上下、前后和内外 3个方向对下颌角形态进行综合评价 ,评价结果可作为术前分析和手术设计的参照标准。

Objective To make cephalometric analysis on the morphology of mandibular angle and its relationship with adjoining craniomaxillofacial structures in adults, and to discuss the application of the results in preoperative analysis and operation design. Methods Cephalometric analysis was made on the following parameters in 30 adults (15 men and 15 women) for frontal and lateral cephalometric radiograms: the distance between the mandibular angles (Go Go) and between the malar points (Zy Zy), and the mandible mental angels (Zy Go Me) on an anteroposterior cephalometric radiograph; the gonial angle (Ar Go Me), mandibular plane sella nasion angle (MP SN) and ramus plane sella nasion angle (RP SN). Results Go Go in male was (130±6) mm, female (116±6) mm; Zy Zy in male was (156±5) mm, female (146±5) mm; Zy Go Me in male was (117±5)°, female (119±5)°; Ar Go Me in male was (117±5)°, female (119±5)°; MP SN in male was (27±5)°, female (29±5)°; RP SN in male was (94±5)°, female (93±5)°. Conclusion The morphology of mandibular angle should be envisioned in three directions. The results of evaluation can be served as the reference of preoperative analysis and surgery design.