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Stress distributions in peri-miniscrew areas from cylindrical and tapered miniscrews inserted at different angles

Title
Stress distributions in peri-miniscrew areas from cylindrical and tapered miniscrews inserted at different angles
Authors
Choi, Sung-HwanKim, Seong-JinLee, Kee-JoonSung, Sang-JinChun, Youn-SicHwang, Chung-Ju
Ewha Authors
전윤식
SCOPUS Author ID
전윤식scopus
Issue Date
2016
Journal Title
KOREAN JOURNAL OF ORTHODONTICS
ISSN
2234-7518JCR Link2005-372XJCR Link
Citation
vol. 46, no. 4, pp. 189 - 198
Keywords
Orthodontic miniscrewsMiniscrew designFinite element analysisStress
Publisher
KOREAN ASSOC ORTHODONTISTS
Indexed
SCIE; SCOPUS WOS scopus
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 30 degrees, 60 degrees, and 90 degrees 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.
DOI
10.4041/kjod.2016.46.4.189
Appears in Collections:
의과대학 > 의학과 > Journal papers
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