【摘要】 目的分析Twin-block矫治器治疗生长发育期骨性Ⅱ类错儿童的临床疗效,探讨其机制。方法选择生长发育期骨性Ⅱ类患者20例(男9例,女11例),进行Twin-block功能矫治。所有患者治疗前后拍摄X线头颅侧位片,应用Pancherz分析法测量患者治疗前后硬组织指标变化情况,同时,测量治疗前后的上气道线距变化,采用配对t检验检测治疗前后各指标差异。结果 Twin-block治疗前后,ss/OLP、pg/OLP明显增大,Co/OLP和前牙覆盖明显减小,Go-Me长度明显增加,磨牙关系明显改善,有统计学意义(P<0.05),其余各参数无统计学差异。气道测量值Adl-PNS、Ad2-PNS、Mcnamara线、U-MPW、TB-TPPW治疗后均有增大,差异有统计学意义(P<0.05)。结论 Twin-block功能矫治器能有效地改善骨性Ⅱ类患者的咬关系和侧貌,可以有效增加上气道各段前后径长度,这些变化主要由髁突前移导致的下颌骨生长发育所致。更多还原

【Abstract】 Objective This study was designed to evaluate the effect of Twin-block appliance on the treatment of skeletal Class Ⅱ malocclusion with mandibular retrognathia in children, and to discuss the underlying mechanism. Methods 20 patients(9 boys and 11 girls) with skeletal Class Ⅱ and mandibular retrognathia were treated with Twin-block appliance. Lateral cephalograms were taken before and after Twin-block treatment, relevant parameters of hard tissue and upper airway were measured, and Pancherz’s analysis was used to analyze hard tissue. Intragroup changes of all the individuals were analyzed by paired t-tests using SPSS 15.0 software. Results Treatment with Twin-block appliance resulted in reduction of overjet, increase of length of mandible and correction of molar relationship, while point Pg, ss, Co moved forward(P<0.05). The position changes of theincisors and the first molars have no significant difference(P>0.05). The value of Adl-PNS, Ad2-PNS, Mcnamara Line, U-MPW and TB-TPPW increased significantly after treatment(P<0.05). Conclusion The Twin-block appliance treatment can efficiently correct incisor and molar relationship and improve skeletal and soft tissue profile in growing skeletal Class II individuals with mandibular retrognathia, meanwhile, the anteroposterior diameter of upper airway was increased. The changes mainly benefit from the skeletal change of the mandible caused by the forward movement of condyle.更多还原