ObjectiveTo compare the chairside time among domestic 3B, Damon Q self-ligating and 3B straight wire brackets.Methods80 orthodontic patients were enrolled in the study. 20 patients were treated with domestic 3B self-ligating brackets, 20 patients with Damon Q self-ligating brackets, 20 patients with straight wire brackets ligated by ligature wires, and 20 patients straight wire brackets ligated by elastomeric rings. After aligning the maxillary and mandibular dentitions, a NiTi rectangular arch wire of 0.018 *0.025 inch was inserted into the brackets, and the time of ligation and deligation was recorded. One-way ANOVA was used to compare the chair-side time of archwire ligation and deligation for the four groups.ResultsThe ligation , deligation and total time of 3B self-ligating bracket group was significantly less than that of ligature wire group and elastomeric ring group (P<0.01). However, there was no significant difference in the ligation , deligation and total time between domes-tic 3B and Damon Q self-ligating brackets (P>0.05). ConclusionThe chairside time of 3B self-ligating bracket group was significantly less than that of ligature wire group and elastomeric ring group, but closed to the Damon Q self-ligating bracket group.

Objective: To compare the attitudes toward orthodontic treatment between adolescents and adults.Methods: Standardized questionnaires on attitude toward orthodontic treatment were sent to 304 patients in Xiangyang City.The data were analyzed statistically.Results: 288 questionnaires were returned.The adults had more aims about orthodontic treatment than the adolescents.A higher percentage of adults considered that malocclusion might influence the dental health than the adolescents did.Conclusion: The desire of adults for orthodontic treatment were higher than that of the adolescents.

由于第一恒磨牙在咀嚼、颌骨定位导向和正畸支抗等方面功能独特[1],临床上第一磨牙拔除后的正畸治疗对我们正畸医生是个挑战.作者对2000～2006年接诊87例患者的正畸治疗进行分析,现报道如下:

由于人类颌骨退化、先天性疾病和牙齿替换异常等原因,埋伏阻生牙日益增多.埋伏阻生牙是矫治中的难点,矫治设计也较独特.我们通过观察40例埋伏阻生牙的矫治效果,作以下的临床分析.

为了准确的标定良好的种植体植入部位和确定植入方向,我们通过使用自制的定位尺,结合X片,取得良好的效果.