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Abstract

BACKGROUND:

Self-locking brackets straight wire appliance is a kind of low fraction and light force correction technique. The combination of self-locking brackets without ligation and high-performance elastic arch wire provide revolutionary change of the efficient correction and fixed orthodontic technique on the clinical treatment.

OBJECTIVE:

To investigate the changes of mandibular position and facial ratio of patients with angle class II division 2 malocclusion by Damon-III self-locking brackets technique.

METHODS:

The sample was consisted of 13 patients with angle class II division 2 malocclusion treated by traditional Roth straight wire appliance and 13 patients with angle class II division 2 malocclusion treated by Damon-III self-locking brackets technique. The pre-and after-treatment cephalometric films were measured to assess the treatment effect.

RESULTS AND CONCLUSION:

After treatment, the sella-nasion-point A (SNA) angle was increased in Damon-III self-locking brackets group and Roth straight wire appliance group, and the sella-nasion-point B (SNB) angle was decreased. It indicated that the mandible in two groups changed significantly in sagittal direction, and had the trend to increase in vertical. Compared with the self-locking brackets group after treatment, the lower mandible had the clockwise trend and the increasing of the mandibular posterior alveolar was not obvious (P < 0.05), the lower incisors inclined was obvious (P < 0.05). The study showed that the changes of the lower mandible and facial proportion caused by the Damon-III self-locking brackets combined with occlusal guide plate+Class II traction was more obvious than the changes caused by Roth straight wire appliance combined with occlusal guide plate+Class II traction, and had the favorable regulation on the lower incisors inclination.

RESULTS AND CONCLUSION:

Zhang Q, Chen X, Zhu J, Liu H. Changes of mandibular position and facial ratio of patients with angle class II division 2 malocclusion by Damon-III self-locking brackets technique.Zhongguo Zuzhi Gongcheng Yanjiu. 2012;16(12): 2207-2211. [http://www.crter.cnhttp://en.zglckf.com]

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