依据中国人正常(牙合)牙齿特征的直丝弓矫治器的应用研究

目的 对依据中国人正常(牙合)牙齿数据的直丝弓矫治器的临床应用结果进行研究评价,为进一步发展适合中国人的直丝弓矫治器提供参考.方法 将依据中国人正常(牙合)牙齿数据的直丝弓矫治器(简称Z1矫治器)应用于30例非拔牙病例,在弓丝不弯制任何补偿弯曲的条件下完成矫治.由5位正畸专家对病例的矫治结果进行半定量评价;对病例模型进行定量测量,通过独立样本t检验将测量结果与中国人正常(牙合)数据进行比较,对Z1矫治器的临床应用效果进行验证与评价.结果 专家组对矫治后模型评价的平均得分为91.2分(百分制),总体评价矫治效果较好.模型测量结果显示,矫治后大多数相邻牙齿的邻面解剖接触点在(牙合)平面上投影的距离均数小于0.3mm,牙齿排列整齐;牙齿的冠凸距与中国人正常(牙合)数据相比,差异无统计学意义;大部分牙齿轴倾度与正常(牙合)相比,差异无统计学意义;转矩的变化规律与正常(牙合)测量结果相似,但下颌后牙负转矩较大.结论 Z1矫治器对非拔牙病例的临床矫治效果较好,用于国人错(牙合)病例时可进一步减少弓丝的弯制,提高矫治质量;下颌后牙转矩的数据需要调整.

Clinical evaluation of preadjusted appliance based on Chinese normal occlusion

OBJECTIVE: To evaluate the effect of the preadjusted appliance (Z1 appliance) based on Chinese normal occlusion. METHODS: Thirty non-extraction patients were treated with Z1 appliance. No wire bending was made during treatment. The results of these 30 cases had been evaluated by five senior orthodontists. Models were analysed quantitatively to testify and evaluate the efficiency of the appliance. RESULTS: The average score for post-treatment models was 91.2 (total score was 100). The model measurements indicated that average projective distance on occlusal plane between proximal contact points of adjacent teeth was less than 0.3 mm, which demonstrated good alignment. The prominence of crowns was almost coincident with the data of Chinese normal occlusion. For the average tip of most teeth, there was no statistical difference between the study group and the normal control group. The crown torque variation tendency from anterior to posterior was similar to that in the subjects with normal occlusion. However, the cases treated with Z1 appliance achieved more negative torque in the lower posterior segment. CONCLUSIONS: The result of the non-extraction patients treated with Z1 appliance was quite satisfied. Wire bending could be reduced during treatment. It was necessary to adjust the crown torque values for lower posterior teeth.