不同高度的牵引钩对前牙移动控制的临床研究

Abstract

Abstract: Abstract: Objective To study the effects of MIA （miniimplant anchorage）combined with traction hooks with different heights on the movement of anterior teeth in order to better use the MIA in orthodontic treatment.Methods 24 patients with severe maxillary protrusion were randomly divided into experimental group and control group,each containing 12 patients.The patients were treated with MIA and straight wire appliance by sliding mechanics to retract anterior teeth and narrow the extraction space.2 mm hooks in experiment group and 6 mm hooks in control group were used for retraction.Cephalometric radiographs were collected before and after the anterior teeth retraction and ttest was used to analysis the data.Results 0.31 mm maxillary molar mesial movement was observed in both groups and the anterior teeth were retracted effectively and uprighted.In the experiment group,anterior teeth were intruded about 1.82mm,while anterior teeth were protruded about 1.05 mm in the control group.Conclusions As the height of traction hook increased,the elongation tendency of anterior teeth increased during the retraction process,and the lingual movement of the maxillary anterior teeth decreased.In the clinical treatment,the traction hooks with different heights should be used according to the specific malocclusion.

CLC Number:

R783.5

References

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Clinical study on the control of the anterior teeth movement using different heights of traction hook

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