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目的 通过对安氏Ⅱ类下颌后缩青少年吞咽时肌肉肌电图和下颌运动描记图进行研究,探索下颌后缩对患者吞咽功能的影响.方法 对29名安氏Ⅱ类下颌后缩青少年(安氏Ⅱ类组)与28名安氏Ⅰ类青少年(对照组)进行吞咽时颞肌前束、咬肌、颏肌肌电幅值及下颌运动范围进行测量,对比两组差异.结果 研究所得的计量数据以(中位数M上(Q25),下(Q75)四分位数)表示.1.安氏Ⅱ类组右侧颞肌前束肌电幅值(3.2(1.7,4.4) μV)小于对照组(5.0(2.7,12.9)μV),双侧咬肌肌电幅值(右3.2(2.2,5.7) μV/左3.1(1.9,4.8)μV)小于对照组(右5.6(3.1,9.7)μV/左4.7(2.6,9.8)μV),双侧颏肌肌电幅值(右22.1(15.2,40.1)μV/左21.9(13.1,36.9) μV)大于对照组(右13.7(7.3,20.7)μV/左10.8(7.0,22.8) μV).2.安氏Ⅱ类组吞咽颌位垂直向偏离(1.2(0.3,2.0)mm)大于对照组(0.5(0.2,1.0) mm)、冠状向偏离(0.4(0.2,0.7)mm)大于对照组(0.2(0.1,0.3)mm),矢状向偏离(-0.4(-1.1,0.3)mm)比对照组(0.1(-0.1,0.4)mm)更为偏前.吞咽过程中下颌垂直向位移(1.6(1.1,3.0) mm)大于对照组(1.0(0.5,1.6) mm),冠状向位移(0.3(0.1,0.8) mm)大于对照组(0.1(0.0,0.2) mm),矢状向位移(-0.4(-1.8,0.5)mm)比对照组(0.0(-0.3,0.4)mm)向前更多.结论 相比于安氏Ⅰ类患者,安氏Ⅱ类下颌后缩青少年中异常吞咽及唇功能不全比例更高.“,”Objective To investigate the influence of sagittal deformity on swallowing by studying the electromyography and kinesiograph of Angle Class Ⅰ and Class Ⅱ adolescents during swallowing.Methods The study sample consisted of 29 Class Ⅱ adolescents with mandibular deficiency as the Class Ⅱ group and 28 Class Ⅰ adolescents as the control group.During their swallowing movement,electromyograms of bilateral anterior temporalis,masseter and mentalis muscles were measured and mandibular range of motion was examined.Then,the two groups were compared.Results 1.The activity of right anterior temporalis (3.2(1.7,4.4) μV) in the Class Ⅱ group was less than that in control group (5.0(2.7,12.9) μV).Meanwhile the activity of bilateral masseter muscles in the Class Ⅱ group (right 3.2(2.2,5.7) μV/left 3.1(1.9,4.8) μV) was less than that in the control group (right 5.6(3.1,9.7) μV /left 4.7(2.6,9.8) μV).However,the activity of mentalis muscles in the Class Ⅱ group (right 22.1(15.2,40.1) μV/left 21.9(13.1,36.9) μV) was greater than that in the control group(right13.7(7.3,20.7) μV/left10.8(7.0,22.8) μV).2.At swallowing position,the vertical (Class Ⅱ group 1.2(0.3,2.0) mm＞ control group 0.5(0.2,1.0) mm) and horizontal (Class Ⅱ group 0.4(0.2,0.7) rnm ＞ control group 0.2(0.1,0.3) mm) deviations of the mandible of the Class Ⅱ group were greater than the control group.The sagittal deviation in Class Ⅱ group (-0.4(-1.1,0.3) mm) was more forward than control group 0.1 (-0.1,0.4) mrn.During swallowing movement,the vertical (Class Ⅱ group 1.6(1.1,3.0) mm＞control group 1.0(0.5,1.6) mm),horizontal (Class Ⅱ group 0.3(0.1,0.8) mm＞ control group 0.1(0.0,0.2) mm) displacements of mandible were greater in the Class Ⅱ group.The sagittal displacement in Class Ⅱ group (-0.4(-1.8,0.5) mm) was more forward than control group (0.0 (-0.3,0.4) mm).Conclusions In comparison with Class 1 patients,Class Ⅱ adolescents have a higher prevalence of lip incompetence and abnormal swallowing pattern.