Stress distributions in peri-miniscrew areas from cylindrical and tapered miniscrews inserted at different angles
최성환, 김성진, 이기준, 성상진, 전윤식, 황충주,
소속 상세정보
최성환 ( Choi Sung-Hwan ) - Yonsei University College of Dentistry Department of Orthodontics
김성진 ( Kim Seong-Jin ) - Private practice
이기준 ( Lee Kee-Joon ) - Yonsei University College of Dentistry Department of Orthodontics
성상진 ( Sung Sang-Jin ) - University of Ulsan College of Medicine Asan Medical Center Department of Orthodontics
전윤식 ( Chun Youn-Sic ) - Ewha Womans University Graduate School of Clinical Dentistry Department of Orthodontics
황충주 ( Hwang Chung-Ju ) - Yonsei University College of Dentistry Department of Orthodontics
KMID : 0361920160460040189
Abstract
Objective: The purpose of this study was to analyze stress distributions in the roots, periodontal ligaments (PDLs), and bones around cylindrical and tapered miniscrews inserted at different angles using a finite element analysis.
Methods: We created a three-dimensional (3D) maxilla model of a dentition with extracted first premolars and used 2 types of miniscrews (tapered and cylindrical) with 1.45-mm diameters and 8-mm lengths. The miniscrews were inserted at 30o, 60o, and 90o angles with respect to the bone surface. A simulated horizontal orthodontic force of 2 N was applied to the miniscrew heads. Then, the stress distributions, magnitudes during miniscrew placement, and force applications were analyzed with a 3D finite element analysis.
Results: Stresses were primarily absorbed by cortical bone. Moreover, very little stress was transmitted to the roots, PDLs, and cancellous bone. During cylindrical miniscrew insertion, the maximum von Mises stress increased as insertion angle decreased. Tapered miniscrews exhibited greater maximum von Mises stress than cylindrical miniscrews. During force application, maximum von Mises stresses increased in both groups as insertion angles decreased.
Conclusions: For both cylindrical and tapered miniscrew designs, placement as perpendicular to the bone surface as possible is recommended to reduce stress in the surrounding bone.
키워드
Orthodontic miniscrews; Miniscrew design; Finite element analysis; Stress
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