摘要
目的:探讨分别以微小种植体作支抗和利用颅部作支抗,推上颌第一磨牙向远中,比较其临床效果及矫治特点。方法:患者16例,其中8例采用口外唇弓推磨牙,为对照组,8例采用种植体作支抗推磨牙,为实验组,共植入16枚微小种植体位于上颌第二前磨牙与第一磨牙之间颊侧牙槽骨内。将Ni-Ti螺旋弹簧压缩后置于上颌第一前磨牙与上颌第一磨牙之间,推磨牙远移。测量上颌第一磨牙的移动速度和距离,在近远中方向、水平方向的位置变化及上切牙的位置变化,衡量磨牙的移动方式和特点,评价支抗强弱。并进行统计学分析,比较两种方法的异同。结果:对照组:上颌第一磨牙平均移动距离3.9mm,疗程6.5个月,平均移动速度0.6mm/月;磨牙长轴向远中倾斜角度为0.5°;磨牙发生远中舌向水平旋转约1.5°;磨牙颊向移位0.8mm;上颌中切牙长轴角度基本无改变。实验组:上颌第一磨牙平均移动距离4.5mm,疗程4.5个月,平均移动速度1.0mm/月;磨牙长轴向远中倾斜角度为0.9°;磨牙发生远中舌向水平旋转约5.5°;磨牙颊向移位0.9mm;上颌中切牙长轴角度基本无改变。结论:两种方法在推上颌磨牙远移的过程中,都发挥了强支抗的作用,未见前牙支抗丧失。但种植体支抗更强。并且对患者的依赖性降低,大大缩短疗程。
Objective This research focused on the comparison the clinical effects and characters of two different types of approaches to distalize upper first molar. Methods 16 patients were divided into two groups equally. In control group extraoral arch was applied to distalize molar and micro-implant anchorage used in experimental Group. In experiment group implant was embedded in buccal alveolar bone between maxillary second premolar and maxillary first molar, then Ni-Ti coil spring was set maxillary first premolar and maxillary first molar. This study had measured the changes in velocity, distance and position of maxillary first molar, which evaluated molar moving form, character to test anchorage intensity. All results were analyzed by statistics. Results Control Group: The distance of molar distalizing was 3.9mm; treatment period was 6.5 month; velocity was 0.6 mm/M. The distal tipping angle of molar was 0.5° and the horizontal circumvolving angle of molar was 1.5°. Maxillary molar move 0.8mm buccally. Experimental Group: distalizing distance was 4.5mm, treatment period was 4.5month, velocity was 4.5mm/M. The distal tipping angle of molar was 0.9°. The horizontal circumgyrating angle of molar was 5.5°. Maxillary molar move buccally 0.9mm. Maxillary central incisor had no labiolingual tipping in both groups. Conclusion During movement of maxillary molar, micro-implant was applied as strong anchorage. This study showed that micro-implant was a very ideal anchorage for distalizing maxillary molar, which greatly reduced reliance with patients and also shortened the whole treatment period.
出处
《中国美容医学》
CAS
2005年第3期335-337,i007,共4页
Chinese Journal of Aesthetic Medicine
关键词
磨牙远移
微小种植体
口外唇弓
安氏Ⅱ类错he
molar distalization
micro-implant
extraoral labial arch
angle Ⅱ malocclusion
