前方前牵引矫治前牙反后下颌位置的变化  

Changes in mandibular direction during and after protraction headgear treatment

作　　者：王娜娜[1] 曹丛[1] 刘东旭[1] 

机构地区：[1]山东大学口腔医学院,山东省口腔生物医学重点实验室,济南250012

出　　处：《山东大学学报（医学版）》2013年第9期95-99,共5页Journal of Shandong University:Health Sciences

基　　金：山东大学交叉学科资助项目(2011GC009;2012JC031)

摘　　要：目的评价替牙期骨性Ⅲ类错患儿行前方前牵引治疗后下颌骨的变化。方法选取山东大学口腔医院正畸科替牙期骨性Ⅲ类错患者60例,其中治疗组30例行前方前牵引治疗,对照组于观察期间未进行治疗。所有研究对象于治疗或观察前(T1)及治疗后或相应的观察期后(T2)拍摄X线头颅侧位片。在T1及T2时期所拍摄头颅侧位片上对反映上下颌骨水平及矢状向生长改变量的相关指标进行测量分析,并利用侧位片重叠技术对下颌骨位置的变化进行评价。结果经过6个月的前方前牵引治疗后,治疗组患者侧貌得到显著改善。治疗或观察期间,治疗组下颌骨发生顺时针旋转,平均旋转量为0.8°,对照组发生逆时针旋转,平均-0.6°,两者之间存在统计学差异(P<0.05);治疗组较对照组下颌骨水平生长量少。结论治疗组经前方前牵引治疗后下颌骨发生顺时针旋转,对照组下颌骨有逆时针生长趋势。Objective To observe and evaluate the mandibular changes in growing Class Ⅲ malocclusion patients treated with protraction headgear. Methods This study consisted of 30 adolescent Class Ⅲ malocclusion subjects treated with protraction headgear and 30 untreated controls from the Department of Orthodontic, School of Stomatology, Shandong University. All the subjects had their lateral cephlometrics taken before and after the treatment or observation period. The cephalometric data including variables assessing sagittal and vertical relationships of maxillary was analyzed and the di- rection of mandibular displacement was evaluated according to a structural superimposition method. Results The re- sults showed significant improvements in dentofacial profile after 6 months of maxillary protraction. During the treat- ment or observation period, the mean mandibular rotation between the treatment and control groups had significant difference （P 〈 0.05 ）. It was clockwise rotation for the treatment group and anticlockwise rotation for the control group. The mean rotation in the treatment and control groups were 0.8~ and -0.6~ , respectively. A more horizontal movement of the mandibular could be observed in the control group during the study period. Conclusion The mandib- ular of the treatment group produces clockwise rotation while the control group has a trend of anticlockwise rotation after protraction headgear treatment.

关 键 词：前方牵引 Ⅲ类错[牙合] 替牙期 头影测量 下颌旋转 

分 类 号：R783.5[医药卫生—口腔医学]