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Effects of placement angle and direction of orthopedic force application on the stability of orthodontic miniscrews

Authors
 Jihye Lee ; Ji Young Kim ; Chooryung J. Chung ; Kyung-Ho Kim ; Yoon Jeong Choi 
Citation
 Angle Orthodontist, Vol.83(4) : 667~673, 2013 
Journal Title
 Angle Orthodontist 
ISSN
 0003-3219 
Issue Date
2013
Abstract
OBJECTIVES: To evaluate the influence of placement angle and direction of orthopedic force application on the stability of miniscrews. MATERIALS AND METHODS: Finite element analysis was performed using miniscrews inserted into supporting bone at angles of 90°, 60°, and 30° (P90°, P60°, and P30°). An orthopedic heavy force of 800 gf was applied to the heads of the miniscrews in four upward (U0°, U30°, U60°, U90°) or lateral (L0°, L30°, L60°, L90°) directions. In addition, pull-out strength of the miniscrews was measured with various force directions and cortical bone thicknesses. RESULTS: Miniscrews with a placement angle of 30° (P30°) and 60° (P60°) showed a significant increase in maximum von Mises stress following the increase in lateral force vectors (U30°, U60°, U90°) compared to those with a placement angle of 90° (P90°). In accordance, the pull-out strength was higher with the axial upward force when compared to the upward force with lateral vectors. Maximum von Mises stress and displacement of the miniscrew increased as the angle of lateral force increased (L30°, L60°, L90°). However, a more dramatic increase in maximum von Mises stress was noted in P30° than in P60° and P90°. CONCLUSION: Placement of the miniscrew perpendicular to the cortical bone is advantageous in terms of biomechanical stability. Placement angles of less than 60° can reduce the stability of miniscrews when orthopedic forces are applied in various directions.
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/87160
DOI
10.2319/090112-703.1
Appears in Collections:
1. 연구논문 > 2. College of Dentistry > Dept. of Orthodontics
Yonsei Authors
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Link
 http://www.angle.org/doi/full/10.2319/090112-703.1
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