| MINISCREW STABILITY REGARDING DESIGN OF MINISCREW AND THICKNESS OF CORTICAL BONE |
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Young-Sun Kweon, Hong-Keun Hyun, Young-Jae Kim, Jung-Wook Kim |
| Department of Pediatric Dentistry, School of Dentistry, Seoul National University |
| 교정용 미니스크류의 디자인과 피질골의 두께에 따른 역학적 안정성 평가 |
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권영선, 현홍근, 김영재, 김정욱 |
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서울대학교 치과대학 소아치과학교실 |
Correspondence:
Jung-Wook Kim, Tel: 02-2072-2639, Email: pedoman@snu.ac.kr
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Received: 20 May 2011 • Accepted: 18 August 2011 |
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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. |
| Key Words:
Orthodontic miniscrew, Cortical bone thickness, Diameter, Length, Body type |
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