摘要
目的探讨替牙期安氏Ⅲ类错的治疗方法。方法选择替牙期安氏Ⅲ类错患者30例,据正中关系位X线头颅测位片的ANB角将其分为两个治疗组:0°<ANB<2°为导弓治疗组;-2°<ANB<0°为联合治疗组。两组病例均用改良导弓矫治器先将前牙反解除,联合组继续用前方牵引器治疗,并对治疗前后的头影测量结果进行了统计学分析。结果两组病例均去除了下颌功能性前伸因素。导弓组平均疗程为5.2个月,导弓矫治器治疗后,SNA平均增加0.5°,随访2年后有2例复发;联合组导弓矫治5.4个月,SNA平均增加0.5°,继续前方牵引平均5.6个月,建立前牙正常的覆覆盖和Ⅰ类磨牙关系,SNA增加1.65°,患者的凹面型均有不同程度的改善,追踪2年无复发。结论正确的决定治疗方案在替牙期安氏Ⅲ类错的诊治中十分重要。
Objective To investigate the treatment method of Class Ⅲ malocclusion in mixed dentition. Methods Thirty patients with Class Ⅲ malocclusion in mixed dentition were selected and divided into two groups according to ANB angle measured on the cephalograms, Removable appliance group（0° 〈 ANB 〈 2°） and combined treatment group （-2° 〈 ANB 〈 0°）. At the initiation of the therapy, the two groups were both treated with modified removable appliance to correct anterior crossbite. The combined treatment group then continued with maxillary protractor. The results were analyzed statistically before and after treatment. Results Mandibular functional shift factor was removed in the two groups treated with removable appliance. The SNA increased by 0.5° 5.2 months after treatment in the removable appliance group. After two years follow-up, relapse was noted in two patients. In the combined treatment group ,the SNA increased by 0. 5° after treatment with removable appliance for 5.4 months, and normal overbite and overjet of anterior teeth and Class Ⅰ molar relationship were achieved after continued treatment with maxillary protraction for 5.6 months, and SNA increased by 1.65°, the concave profile of patients was improved and no relapse occured after two years follow-up. Conclusion To achieve good results, appropriate treatment design should be carefully chosen for patients with Class Ⅲ malocclusion in the mixed dentition.
出处
《北京口腔医学》
CAS
2007年第5期264-267,共4页
Beijing Journal of Stomatology
关键词
替牙期
错[牙合]
治疗
Mixed dentition
Malocclusion
Treatment
