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KMID : 0361920120420050242
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Korean Journal of Orthodontics
2012 Volume.42 No. 5 p.242 ~ p.248
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Comparison of success rates of orthodontic mini-screws by the insertion method
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Kim Jung-Suk
Cha Sang-Kwon
Kim Jang-Han
Lee Hwa-Jin
Yeom Sang-Seon
Choi Seong-Hwan
Hwang Chung-Ju
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Abstract
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Objective: The aim of this study was to compare the success rates of the manual and motor-driven mini-screw insertion methods according to age, gender, length of mini-screws, and insertion sites.
Methods: We retrospectively reviewed 429 orthodontic mini-screw placements in 286 patients (102 in men and 327 in women) between 2005 and 2010 at private practice. Age, gender, mini-screw length, and insertion site were cross-tabulated against the insertion methods. The Cochran-Mantel-Haenszel test was performed to compare the success rates of the 2 insertion methods.
Results: The motor-driven method was used for 228 mini-screws and the manual method for the remaining 201 mini-screws. The success rates were similar in both men and women irrespective of the insertion method used. With respect to mini-screw length, no difference in success rates was found between motor and hand drivers for the 6-mm-long mini-screws (68.1% and 69.5% with the engine driver and hand driver, respectively). However, the 8-mm-long mini-screws exhibited significantly higher success rates (90.4%, p < 0.01) than did the 6-mm-long mini-screws when placed with the engine driver. The overall success rate was also significantly higher in the maxilla (p < 0.05) when the engine driver was used. Success rates were similar among all age groups regardless of the insertion method used.
Conclusions: Taken together, the motor-driven insertion method can be helpful to get a higher success rate of orthodontic mini-screw placement.
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KEYWORD
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Mini-screw, Orthodontic engine driver, Motor-driven driver, Hand driver
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