摘要
目的:在Typodont模型上,模拟临床应用自锁托槽结合微种植体支抗关闭拔牙间隙的过程,研究新方案对关闭间隙速度的影响。方法:制作24个安氏I类双颌牙齿前突的标准Typodont模型,随机分成实验组和对照组各12个。实验组使用自锁托槽结合微种植体支抗牵引关闭拔牙间隙,牵引力为75g;对照组则使用直丝弓托槽结合口外弓支抗关闭拔牙间隙,牵引力为150g。结果:实验组的平均间隙关闭速度为(1.37±0.03)mm/h,显著高于对照组的(0.87±0.03)mm/h(P<0.001)。实验组的上颌中切牙平均舌侧移动距离为(6.27±0.44)mm,显著大于对照组的(4.34±0.38)mm(P<0.001)。实验组的上颌第一磨牙平均近中移动距离为(0.11±0.08)mm,显著小于对照组的(2.34±0.24)mm(P<0.001)。结论:应用自锁托槽结合微种植体支抗关闭拔牙间隙速度显著快于传统的直丝弓托槽结合口外弓支抗,支抗丧失更少。
Objective：To investigate the influences of speed on using the self-locking bracket combined with micro-implant anchorage to accelerate the gap closed after tooth extracted on the Typodont model.Methods：Twenty-four Angle Class I standard Typodont models of bimaxillary teeth protrusion were made and randomly divided into two groups（n=12）.In experimental group,the space was closed by self-locking bracket combined with micro-implant anchorage with 75g traction.In control group,the space was closed by straight-silk bows bracket combined with extra-oral bow anchorage with 150g traction.Results：The space-closing speed was significantly higher in experimental group than in control group（1.37±0.03）mm/h vs（0.87±0.03）mm/h（P0.001）.The Lingual moving distance of maxillary central incisor was significantly greater in experimental group than in control group（6.27±0.44）mm vs（4.34±0.38）mm（P0.001） and the mesial moving distance of maxillary first molars was significantly less in experimental group than in control group（0.11±0.08） mm vs（2.34±0.24）mm（P0.001）.Conclusion：Self-locking bracket combined with micro-implant anchorage results in faster space-closing speed and less anchorage loss than straight-silk bows bracket combined with extra-oral bow anchorage.
出处
《口腔医学研究》
CAS
CSCD
2012年第12期1296-1297,1300,共3页
Journal of Oral Science Research
