恒牙列骨性Ⅲ类错牙■矫治前后■平面及下颌平面变化的临床观察

Clinical observation on the changes of occlusal plane and mandibular plane before and after treatment of skeletal class Ⅲ malocclusion of permanent dentition

目的了解恒牙列骨性Ⅲ类错[牙合]患者单纯正畸掩饰性治疗前后[牙合]平面、下颌平面的变化及其相关关系。方法回顾性分析12例恒牙列骨性Ⅲ类错[牙合]患者的临床资料,其中ANB角平均(-3.33±1.74)°,SN-MP角平均(37.67±4.89)°。拔下颌左右第二或第三恒磨牙,配合下颌颊棚区微种植体支抗或多曲方丝弓技术矫治,比较矫治前后X线头影测量指标变化情况,分析矫治前后牙颌颅面变化与[牙合]平面、下颌平面变化的相关关系。结果矫治后ANB角平均增大(1.79±1.62)°;OPP-FH平均减小(2.83±2.92)°,FH-OP平均减小了(2.25±2.13)°,矫治前后比较差异有统计学意义(P<0.05);OPA-OPP、FH-MP、SN-MP矫治前后比较差异无统计学意义(P>0.05)。相关分析结果显示,前面高、前下面高变化与下颌平面变化之间存在正相关关系(P<0.05)。结论恒牙列骨性Ⅲ类错[牙合]患者经过合理的支抗设计,可以得到良好的矫治,患者正侧貌也可一定程度改善,[牙合]平面及下颌平面也可以得到较好控制。

Objective To investigate the changes of occlusal plane and mandibulaRplane before and afteR orthodontic treatment in patients with skeletal class Ⅲ malocclusion of permanent dentition and theiRcorrelation. Methods Twelve patients with skeletal class Ⅲ malocclusion permanent teeth were selected as the study subjects and theiRclinical data were retrospectively analyzed. The mean of ANB angle was (-3.33±1.74)°, and the mean of SN-MP angle was (37.67±4.89)°. The second oRthird permanent mandibulaRmolars were extracted and treated with micro- implant anchorage oRMultiloop Edgewise Arch-Wire. The changes of cephalometric parameters were compared before and afteRtreatment and the correlations between the changes of maxillofacial surface and the changes of occlusal plane and mandibulaRplane were analyzed before and afteRtreatment. Results AfteRcorrection, the ANB angle increased by (1.79±1.62)degrees, and the OPP-FH angle decreased by (2.83±2.92)degrees, and the FH-OP angle decreased by (2.25±2.13)degrees, with significant differences before and afteRtreatment( P<0.05). There were no significant differences in OPA-OPP, FH-MP and SN-MP between preoperative treatment and postoperative treatment( P>0.05). Correlation analysis showed that there was a positive correlation between the changes of anterioRheight and anterior-inferioRheight and the changes of mandibulaR plane( P<0.05). Conclusion As long as the anchorage design is reasonable, the skeletal class Ⅲ malocclusion can be corrected, and the patients′ normal profile can be improved to a certain extent, and the occlusal plane and the mandibulaRplane can be well controlled.