【摘要】 目的:评估生长发育期骨性Ⅱ类1分类错患者,通过联合使用颈带口外弓与下颌多用途弓治疗后牙与骨的改变。方法:60例患者分为3组,第1组(n=20)只使用颈带口外弓治疗,第2组(n=20)使用颈带口外弓与下颌多用途弓联合治疗,第3组是未治疗的对照组(n=20)。治疗前后牙和骨的改变通过头颅侧位片进行测量分析。采用SPSS15.0软件包对数据进行t检验。结果:治疗组前面高增加较对照组大,下颌支高度显著增加;下颌多用途弓引起下切牙压低且舌倾,下磨牙远中倾斜而未伸长;与对照组比较,颈带口外弓治疗后上磨牙伸长平均值不足1mm。结论:治疗组上颌突度显著减少;前面高较对照组显著增加,下颌支高度也显著增加,下颌平面无显著改变。治疗组上磨牙伸长小于1mm,可以认为没有临床意义。下颌多用途弓引起下切牙压低、舌倾;下磨牙远中倾斜,没有伸长。多用途弓并没有影响下颌的旋转。更多还原

【Abstract】 PURPOSE: To evaluate the effect of cervical headgear and lower utility arch in growing skeletal Class Ⅱ division 1 patients.METHODS: The patients were divided into 3 groups,the first group was treated with cervical headgear alone(n=20),the second group was treated with cervical headgear and lower utility arch(n=20),and the third group was a control group without treatment(n=20).Cephalometric radiographs were taken and analyzed with SPSS15.0 software package.Student’s t test was used to determine if there was significant difference among the 3 groups.RESULTS: Anterior facial height and ramus height displayed significantly increase in the treatment groups than those in the control group;the lower utility arch produced intrusion and lingual tipping of the mandibular incisors and distal tipping without extrusion of the mandibular molars;compared with the control group,maxillary molar total extrusion produced by cervical headgear treatment was not more than 1mm at average.CONCLUSIONS: The treatment groups show significant reduction in maxillary protrusion;significant increase in the anterior descent of the PP and ramus height,as a result,mandibular plane orientation is relatively unchanged.The treatment groups have maxillary molar extrusion less than 1mm,which can be considered clinically not significant.The lower utility arch produces mandibular incisor intrusion and lingual tipping,the mandibular molars tip distally without extrusion,the lower utility arch does not influence the mandibular rotation.更多还原