微螺钉种植体支抗压低上前牙改善露龈笑临床研究

目的：探讨微螺钉种植体支抗压低上前牙改善露龈笑临床疗效。方法：选择10例深覆牙合,露龈笑病例,男4例,女6例,均采用直丝弓矫治技术。位于12,22远中根尖处颌骨内,种植直径1.5mm,长9mm微螺钉,在方丝12,22远中置游离拉钩,向微螺钉种植体做弹性牵引,每侧70g力,持续牵引5个月。通过治疗前后头颅定位片测量数据,U1-PP,U1-SN,U6-PP,U6-SN,上唇长度ULL,上唇突度ULP,对数据进行T检验。结果：U1-PP,U1-SN显著减小,U6-PP,U6-SN增大,上唇长度ULL增大,上唇突度ULP减小。结论：微螺钉种植体支抗是压低上前牙改善露龈笑的有效方法。

Research on the clinical efficiency of improving gummy smile by micro-implant anchorage for the maxillary anterior teeth intrusion

Objective:To research the clinical efficiency of improving gummy smile by micro-implant anchorage for the maxillary anterior teeth intrusion. Method:Choose 10 patients with deep overbite and gummy smile, including 4 males and 6 females.The technique of straight wire appliance was applied to the treatment. The micro-implant whose diameter is 1.6 mm and whose length is 7 mm was inserted into the jaw bone positioning on 12,22 distal root. On the edgewise wire placed a free retractor. And seventy gram's force was used to intrude maxillary anterior teeth for five months. Then carried out T tests on the metrical data U1-PP,U1-SN,U6-PP,U6-SN,ULL,ULP,which were gotton from the cephalometric films before and after the treatment. Result:While U1-PP,U1-SN and ULP decreased,U6-PP,U6-SNandULL increased conspicuously. Conclusion:Micro-implant anchorage for the maxillary anterior teeth intrusion is one of the efficient methods to improve a gummy smile.