Suzuki Selly Sayuri, Previdente Luiz Henrique, Garcez Aguinaldo Silva, Suzuki Hideo
Department of Orthodontics at São Leopolda Mandic Dental Research Center, Brazil.
Int J Orthod Milwaukee. 2013 Spring;24(1):51-5.
The aim of this case report was to demonstrate the efficient use of miniscrew as anchorage in a 12-year-old male patient with skeletal and dental Class II and severe biprotrusion and lips procumbency. It was proposed a compensating orthodontic treatment with 4 premolar extraction and maximum anchorage. Since the patient abandoned treatment after one premolar extraction, loss of anchorage occurred and treatment plan was modified to maximize lower retraction with miniscrew anchorage and distalization of the upper arch using two methods: Class II elastics from lower miniscrews to the sliding jig and modified transpalatal arch using palatal miniscrew. The results showed a significant improvement of his facial appearance, lip protrusion and also dental esthetics and function. It was concluded that miniscrews can provide absolute anchorage for maximum anterior retraction in order to correct dentoalveolar biprotrusion in the presence of limited thickness alveolar bone.
本病例报告的目的是展示微型螺钉在一名12岁男性患者中的有效应用，该患者为骨骼和牙齿II类错颌，伴有严重的双前突和唇部前突。提出了采用拔除4颗前磨牙并使用最大支抗的正畸代偿性治疗方案。由于患者在拔除一颗前磨牙后放弃治疗，出现了支抗丧失的情况，治疗方案因此修改为使用微型螺钉支抗最大化下颌后缩，并采用两种方法对上颌牙弓进行远中移动：从下颌微型螺钉到滑动矫治器的II类牵引，以及使用腭部微型螺钉的改良腭弓。结果显示，患者的面部外观、唇部前突以及牙齿美观和功能均有显著改善。得出的结论是，在牙槽骨厚度有限的情况下，微型螺钉可为最大程度的前牙后缩提供绝对支抗，以纠正牙牙槽骨双前突。
