带环式Herbst矫治器的支抗改良及应用比较

Modification and Comparison of Anchorage Desigin Herbst Appliance with Anchorage Bands.

目的 针对传统带环支抗式Herbst矫治器使用中带环易断裂的原因 ,提出改良设计 ,比较传统和改良支抗设计治疗中带环断裂情况。方法 记录 6例传统支抗设计 ,7例改良支抗设计患者矫治过程中带环断裂情况。结果 传统支抗的Herbst矫治器 ,上颌磨牙和下颌第一双尖牙的带环最易受损 ,尤以下颌第一双尖牙为甚。增加颊侧连接丝后的改良支抗 ,带环断裂情况明显改善。结论 改良带环支抗设计制作简单 。

Objective Traditional banded Herbst appliance was modified to overcome the shortage of frequent band breakage. Methods The subjects consisted of 6 patients with the traditional banded Herbst (TBH) and 7 patients with the modified banded Herbst (MBH). During the treatment period, the frequency of bands breakage of the two groups was recorded and compared. Results In the TBH group, most of the band breakage took place at the distal axiobuccal surface of the upper first premolar and the mesial axiobuccal surface of the upper first molar, especially at the distal axiobuccal surface of the upper first premolar. Few band breakage took place in modified group. Conclusion The modified banded Herbst had a better clinical effect then traditional one.