摘要
目的:研究微种植体支抗在矫治上颌前突病例中整体内收上前牙段的应用。方法:选择5例上颌前突患者,拔除第二前磨牙,采用直丝弓矫治技术,辅以微种植体支抗同时整体内收前牙段(6个前牙及2个第一前磨牙),通过X线头影测量分析,观察矫治前后上颌骨软硬组织的变化。结果:上颌骨的变化轻微;切牙平均内收(4.6±1.5)mm,压低(0.8±1.1)mm,根尖后移(1.7±1.4)mm,切牙与腭平面的夹角减少(6.8±3.5)度;支抗磨牙水平前移(0.5±0.3)mm,没有出现明显的颌向伸长;上唇突度减少(2.0±0.9)mm,鼻唇角增大(3±2.4)度。结论:微种植体能提供稳定的支抗,同时整体内收上前牙段,最大限度避免支抗的丧失,改善上唇突度。
Aim： To Study the efficiency of mini-implants as intraoral anchorage units for en-masse re-traction of the 6 maxillary anterior teeth and 2 first premolars after the second premolars are extracted.Methods： Five patients requiring high anchorage after extraction of the maxillary second premolars wereselected for this study. Straight wire appliance and mini-implants were used for en-masse retraction, Hori-zontal, vertical, and angular positions of the maxillary ？ rst molar and central incisor were evaluated ceph-alometrically before and after orthodontic retraction. Results： The edge of upper incisors were retracted（4. 6 ± 1.5 ）mm and intruded （0. 8 ± 1.1 ） mm, the root apex moved distally （ 1.7 ± 1.4） mm. The maxil-lary first molars showed mesial movement of （0. 5 ± 0. 3 ） mm. The nasolabial angle increased （3 ± 2. 4）° and the angle between upper incisor and PP-plane decreased （6. 8 ± 3.5 ）°. Conclusion： Mini-implants are efficient for intraoral anchorage reinforcement for en-masse retraction and intrusion of maxillary anterior teeth.
出处
《暨南大学学报（自然科学与医学版）》
CAS
CSCD
北大核心
2011年第6期632-636,共5页
Journal of Jinan University(Natural Science & Medicine Edition)
基金
广东省自然科学基金项目(7001570)
关键词
X线头影测量
微种植体支抗
整体内收
X-ray cephalometric study
mini-implant
en-masse retraction
