Verma Sneh Lata, Sharma Vijay Prakash, Singh Gyan Prakash, Sachan Kiran
Department of Orthodontics, B.B.D. College of Dental Sciences, Barabanki, Uttar Pradesh, India.
Department of Orthodontics, Chandra Dental College and Hospital, Barabanki, Uttar Pradesh, India.
Dent Res J (Isfahan). 2013 Nov;10(6):764-71.
The extraction of teeth for orthodontic purpose has always been a controversial subject in the speciality. The aesthetics impact of the soft-tissue profile might play a key role in deciding on premolar extraction or non-extraction (NE) treatment, particularly in borderline patients. The purpose of this cephalometric study was to examine the soft-tissue treatment effects of Class II Division 1 malocclusion undergoing extraction of all first premolars in comparison with patients undergoing treatment with a NE approach.
Hundred post-pubertal female patients of Class II Division 1 malocclusion were selected. Group 1, treated with four first premolar extractions, consisted of 50 female patients with a mean age of 14 years 1 month. Group 2, treated without extractions, consisted of 50 patients with a mean age of 13 years 5 months. Pre-treatment and post-treatment lateral cephalograms of the patients were obtained. The pre-treatment and post-treatment stage comparison and the intergroup comparison of the treatment changes were conducted between extraction and NE groups of Class II malocclusion samples with t tests. The levels of significance tested were P < 0.05 and P < 0.01.
The main soft-tissue differences between the groups at the end of treatment were a more retruded lower lip and a more pronounced lower labial sulcus in those patients subjected to extraction.
In Class II Division 1 patients, the extraction or NE decision, if based on sound diagnostic criteria, seems to have no systematic detrimental effects on the facial profile.
出于正畸目的拔牙在该专业领域一直是一个有争议的话题。软组织侧貌的美学影响可能在决定拔除前磨牙或不拔牙（NE）治疗中起关键作用，尤其是在临界病例中。这项头影测量研究的目的是比较拔除所有第一前磨牙的安氏II类1分类错牙合患者与采用不拔牙方法治疗的患者的软组织治疗效果。
选取100名青春期后安氏II类1分类错牙合的女性患者。第1组为拔除四颗第一前磨牙进行治疗，由50名平均年龄为14岁1个月的女性患者组成。第2组为不拔牙治疗，由50名平均年龄为13岁5个月的患者组成。获取患者治疗前和治疗后的头颅侧位片。采用t检验对安氏II类错牙合样本的拔牙组和不拔牙组进行治疗前和治疗后阶段比较以及治疗变化的组间比较。检验的显著性水平为P < 0.05和P < 0.01。
治疗结束时两组之间主要的软组织差异在于拔牙患者的下唇更后缩，下唇唇沟更明显。
在安氏II类1分类患者中，如果基于合理的诊断标准做出拔牙或不拔牙的决定，似乎对面部侧貌没有系统性的不利影响。
