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目的探讨早期骨性Ⅲ类错患者上腭快速扩弓联合前方牵引矫治后咽腔的改变。方法选择2007年6月至2009年5月大连医科大学附属第一医院口腔正畸门诊收治的早期骨性Ⅲ类错患者30例,行上腭快速扩弓联合前方牵引治疗,并测量矫治前后各指标变化。结果与矫治前比较,矫治后上齿槽座点到Y轴的距离(Y-A)增加,下齿槽座点到Y轴的距离(Y-B)和颏前点到Y轴的距离(Y-Pog)减小,上咽腔宽(UPW)、中咽腔宽(MPW)增加,鼻咽部面积(nasopharynx)和口咽上部面积(oropharynx1)增加(均P<0.01);下咽腔宽(LPW)、口咽下部面积(oropharynx2)及头位角(SN-CVT)变化差异无统计学意义(均P>0.05)。结论上颌前方牵引能改变咽腔大小。
Objective To investigate the changes of the pharyngeal cavity after rapid palatal expansion combined with anterior traction treatment in patients with early stage orthotopic skeletal Class Ⅲ malocclusion. Methods Thirty patients with early stage skeletal class Ⅲ malocclusion admitted to the First Affiliated Hospital of Dalian Medical University from June 2007 to May 2009 were treated with rapid palatal expansion combined with anterior traction and were measured before and after treatment The indicators change. Results Compared with those before treatment, the distance from the upper alveolar base to the Y-axis increased (YB), the distance from the lower alveolar base to the Y-axis (YB) and the distance from the anterior chin point to the Y-axis (Y-Pog) (UPW), MPW (Central pharyngeal cavity width), nasopharynx and oropharynx1 (all P <0.01) , Oropharynx2 and SN-CVT had no significant difference (all P> 0.05). Conclusion Anterior maxillary traction can change pharyngeal size.