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

 Sung-Hwan Choi  ;  Seong-Jin Kim  ;  Kee-Joon Lee  ;  Sang-Jin Sung  ;  Youn-Sic Chun  ;  Chung-Ju Hwang 
 Korean Journal of Orthodontics (대한치과교정학회지), Vol.46(4) : 189-198, 2016 
Journal Title
 Korean Journal of Orthodontics  (대한치과교정학회지) 
Issue Date
Finite element analysis ; Miniscrew design ; Orthodontic miniscrews ; Stress
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°, 60°, and 90° 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.
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
이기준(Lee, Kee Joon) ORCID logo https://orcid.org/0000-0002-0782-3128
최성환(Choi, Sung Hwan) ORCID logo https://orcid.org/0000-0002-1150-0268
황충주(Hwang, Chung Ju) ORCID logo https://orcid.org/0000-0003-3024-4551
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