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KMID : 0358920110380030250
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Journal of the Korean Academy of Pedodontics
2011 Volume.38 No. 3 p.250 ~ p.259
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MINISCREW STABILITY REGARDING DESIGN OF MINISCREW AND THICKNESS OF CORTICAL BONE
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Kweon Young-sun
Hyun Hong-Keun
Kim Young-Jae
Kim Jung-Wook
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Abstract
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The aim of this study was to suggest a design for an orthodontic miniscrew which may work most favorably in the thin cortical bone of the adolescent. In this study, orthodontic miniscrews with different diameters, lengths, and body types were manufactured and implanted in two artificial bone samples with different cortical bone thickness. Maximum insertion torque, maximum removal torque, and lateral alteration torque were measured. As a result, the bone quality, body type, diameter, and the length all had their effects on the maximum insertion torque, maximum removal torque, and lateral alteration torque. Cortical bone thickness was the most important factor. In initial stability, conical types showed better results than cylindrical types. Increase in the diameter had favorable effects in achieving mechanical stability. Increase in the length did not have as much influence as the other factors did on the initial stability, but there was a statistically significant difference between screws of 6 mm and 8 mm lengths(p<0.05). In conclusion, the conical type screw with a diameter of 1.8 mm is most favorable in the thin cortical bone of the adolescent. In terms of length, the 8 mm screw is expected to perform better than the 6 mm screw.
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KEYWORD
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Orthodontic miniscrew, Cortical bone thickness, Diameter, Length, Body type
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