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

Sung Hwan Choia, Seong Jin Kim, Kee Joon Leea, Sang Jin Sung, Youn Sic Chun, Chung Ju Hwang

Research output: Contribution to journalArticle

3 Citations (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 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.

Original languageEnglish
Pages (from-to)189-198
Number of pages10
JournalKorean Journal of Orthodontics
Volume46
Issue number4
DOIs
Publication statusPublished - 2016 Jul

All Science Journal Classification (ASJC) codes

  • Orthodontics

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