BACKGROUND: Mini-screw anchorage is an innovation technique applied in the orthodontic field, expanding the treatment ability of orthodontic appliance. Accurate of mini-screw insertion in the target position is a clinical problem which making orthodontist trouble in this technique application. OBJECTIVE: To introduce a kind of three dimensional guide of mini-screw used as anchorage in orthodontic treatment and to evaluate the positioning accuracy. DESIGN, TIME AND SE'I-rlNG: A contrast study was performed at the Department of Orthodontics, Capital Medical University from April to October 2005. PARTICIPANTS: Twenty cases (40 mini-screws) of maxillary critical anchorage requisition were considered as the experimental group, and 15 cases (30 mini-screws) who were not treated with surgical guide were considered as the control group. METHODS: Self-made stent was used as a positioning guide for implantation of mini-screw anchorage between the roots of upper second bicuspid and first molar. Thereafter, the position was measured. MAIN OUTCOME MEASURES: The vertical distance from measure points to the reference middle line were measured. RESULTS: In 40 mini-screws inserted with the aid of surgical guide, the average survival time of mini-screw as anchorage was 10.3 months, 2 were lost, and the success rate was 95%. The average survival time of 30 mini-screws in the control group was 9 months, 9 were loss, and the success rate was 70%. The positioning measurement showed that deviation of mini-screw was not found in the experimental group, but it was found in the control group. CONCLUSION: By aid of surgical guide splint, mini-scraw can be inserted correctly into the target region.%背景:微螺钉种植支抗是近几年应用于口腔正畸临床的一种新技术,拓宽了口腔正畸的矫治范围,但准确植入是目前临床面对的难点.目的:介绍一种三维种植钉辅助植入装置,评价其对种植钉植入位置准确性的影响.设计、时间及地点:对照观察,于2005-04/10在首都医科大学北京口腔医院正畸科土府井部完成.对象:临床筛选20例(40枚)上颌需要强支抗的患者作为实验组,以15例(30枚)未使用定位辅助装置植入上颌种植钉的患者作对照.方法:实验组应用自制夹板作为定位导航装置辅助微螺钉种植支抗的植入,在上颌第2前磨牙与第1磨牙之间植入种植钉,植入后进行微螺钉种植支抗的定位测量.主要观察指标:应用局部根尖片测量临近牙根定点甭微螺钉长轴的垂直距离.结果:实验组40枚种植钉在口内植入时间平均10.3个月,其中有2枚脱落,成功率为95%.对照组30枚种植钉在口内植入时间平均9个月,其中9枚脱落,成功率为70%.微螺钉种植支抗的定位测量结果表明,实验组种植钉距中轴角分线没有出现显著性偏差;对照组未应用定位辅助装置种植钉植入方向明显出现偏差.结论:三维种植钉辅助植入装置可以帮助初次使用种植支抗的正畸医师将助攻种植钉准确地植入日标区域.
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