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KMID : 0988720080240020203
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2008 Volume.24 No. 2 p.203 ~ p.212
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three dimensional study of miniscrew about installation area and angle
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Lee Jin-Woo
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Abstract
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Minimizing damage to anatomical structure is a prerequisite for skeletal anchorage system to install a miniscrew. This research has focused on evaluating the stability and safety of installation in the maxillary molar buccal area, in which most miniscrews are installed clinically and initial fixation is weak. CT (computerized tomography)images were taken for surveying the possibility of damaging to adjucent teeth in accordance with installation angle. If we install a mini-screw(1.2×6.0mm) in the maxillary molar buccal area, it would be located generally in the 5～8mm upper of CEJ and 3～5mm inner of the cortical bone surface. We has measured the space between roots And comparison has been made for gender and the space between roots in accordance with the 3 different angles of installation(30 degree, 40 degree, 60 degree) in 3 categories. Category 1 : between 1st molar and 2nd molar Category 2 : between 1st molar and 2nd premolar Category 3 : between 1st premolar and 2nd premolar The result are as follow; 1. The space for category 1 was significantly small. 2. For the installation angle, it was safer to install with steeper angle in category 1 and category 2, but not in category 3. According to these results, the installation a miniscrew in category 2, 3 is safer than in category 1. And it is safer to install with steeper angle in category 1 and category 2.
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KEYWORD
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Buccal area, Computed tomography, Miniscrew
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