摘要目的 通过观察前方牵引矫治18～24岁骨性反(牙合)患者的疗效,探讨前方牵引矫治的机制.方法 选择15例骨性Ⅲ类错(牙合)成年患者,年龄18～24岁(平均19.2岁),通过上下颌活动和固定矫治器的合理配置,利用晚间上颌前方牵引联合白天Ⅲ类颌间牵引进行矫治,前方牵引疗程约7个月,总疗程约24个月.头影测量分析治疗前后头颅侧位X线片.结果 经过治疗15例患者外形侧貌及咬合关系基本正常.SNA角、SNB角、ANB角由治疗前的(79.6±3.7)°、(83.5±3.3)°、(-4.1±2.0)°变为(81.1±3.8)°、(82.6±3.6)°、(-1.5±1.8)°,矫治前后相比,差异有统计学意义(P＜0.01).结论 上下颌活动和固定矫治器的合理配置能连续实施上颌骨矫形作用,为临床矫治18～24岁骨性Ⅲ类反(牙合)提供了新思路.

abstractsObjective To investigate the clinical effects of facemask protractiong on skeletal Class Ⅲ adult patients. Methods Totally 15 skeletal Class Ⅲ patients (male 7, female 8, aged 18-24 years)were included in the study. Removable and fixed appliances were used in the upper or lower arches.Facemask protraction was used at night for about 7 months and Class Ⅲ elastics were worn during the day.The total treatment time was 24 mouths on average. Cephalometric analysis was carried out before and after treatment. Results The profile was greatly improved and Class Ⅰ molar relationship was achieved. SNA angle was increased from (79.6 ±3.7)° to (81.1 ±3. 8)°. SNB angle was decreased from (83. 5 ±3. 3)°to (82. 6 ± 3.6 ) °. ANB angle was increased from ( - 4. 1 ± 2. 0 ) ° to ( - 1.5 ± 1.8 ) °. Conclusions Protraction was effective in the treatment of skeletal Class Ⅲ adult patients.