SymbolA three-dimensional positioning guide for accurate mini-screw insertion:Design and clinical application
- Wang, Jia-yan
- Zhang, Dong-liang
- Li, Meng-hua
1Department of Stomatology, Beijing Oriental Hospital, Beijing University of Traditional Chinese Medicine, Beijing 100078, China; 2Department of Orthodontics, Beijing Stomatology Hospital, Capital Medical University, Beijing 100006, China
Wang Jia-yan, Master, Attending physician, Department of Stomatology, Beijing Oriental Hospital, Beijing University of Traditional Chinese Medicine, Beijing 100078, China
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Correspondence to: Zhang Dong-liang, Doctor, Associate chief physician, Department of Orthodontics, Beijing Stomatology Hospital, Capital Medical University, Beijing 100006, China [email protected]
Supported by: the Key Project of Beijing Stomatology Hospital of Capital Medical University*
Received: 2008-08-11
Accepted: 2008-12-27 (54200808110006/G)
[http://www.crter.cnhttp://en.zglckf.com]
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Abstract
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 SETTING:
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-screw can be inserted correctly into the target region.
Wang JY, Zhang DL, Li MH.A three-dimensional positioning guide for accurate mini-screw insertion: Design and clinical application. Zhongguo Zuzhi Gongcheng Yanjiu yu Linchuang Kangfu. 2009;13(13): 2593-2596. [http://www.crter.cnhttp://en.zhlckf.com]
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