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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Original Article

Korean J Orthod 2008; 38(5): 304-313

Published online October 30, 2008 https://doi.org/10.4041/kjod.2008.38.5.304

Copyright © The Korean Association of Orthodontists.

Factors influencing primary stability of miniplate anchorage: a three-dimensional finite element analysis

Nam-Ki Lee, DDS, MSD, aDong-Soon Choi, DDS, MSD, aIn-San Jang, DDS, b and Bong-Kuen Cha, DDS, MSD, Professorc

aAssistant professor, Department of Orthodontics, School of Dentistry, Kangnung National University, Korea.
bPostgraduate student, Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Japan.
cProfessor, Department of Orthodontics, School of Dentistry, Kangnung National University, Korea.

Correspondence to: Nam-Ki Lee. Department of Orthodontics, School of Dentistry, Kangnung National University, 120, Gangneung Daehangno, Gangneung 210-702, Korea. +82 33 640 2756; Email: ortho0328@hanmail.net

Received: May 20, 2008; Revised: August 13, 2008; Accepted: August 16, 2008

Abstract

Objective

The purpose of this study was to evaluate the stress distribution in bone and displacement distribution of the miniscrew according to the length and number of the miniscrews used for the fixation of miniplate, and the direction of orthodontic force.

Methods

Four types of finite element models were designed to show various lengths (6 mm, 4 mm) and number (3, 2) of 2 mm diameter miniscrew used for the fixation of six holes for a curvilinear miniplate. A traction force of 4 N was applied at 0°, 30°, 60° and 90° to an imaginary axis connecting the two most distal unfixed holes of the miniplate.

Results

The smaller the number of the miniscrew and the shorter the length of the miniscrew, the more the maximum von Mises stress in the bone and maximum displacement of the miniscrew increased. Most von Mises stress in the bone was absorbed in the cortical portion rather than in the cancellous portion. The more the angle of the applied force to the imaginary axis increased, the more the maximum von Mises stress in the bone and maximum displacement of the miniscrew increased. The maximum von Mises stress in the bone and maximum displacement of the miniscrew were measured around the most distal screw-fixed area.

Conclusions

The results suggest that the miniplate system should be positioned in the rigid cortical bone with 3 miniscrews of 2 mm diameter and 6 mm length, and its imaginary axis placed as parallel as possible to the direction of orthodontic force to obtain good primary stability.

Keywords: Miniplate, Anchorage, Primary stability, Finite element analysis

Article

Original Article

Korean J Orthod 2008; 38(5): 304-313

Published online October 30, 2008 https://doi.org/10.4041/kjod.2008.38.5.304

Copyright © The Korean Association of Orthodontists.

Factors influencing primary stability of miniplate anchorage: a three-dimensional finite element analysis

Nam-Ki Lee, DDS, MSD, aDong-Soon Choi, DDS, MSD, aIn-San Jang, DDS, b and Bong-Kuen Cha, DDS, MSD, Professorc

aAssistant professor, Department of Orthodontics, School of Dentistry, Kangnung National University, Korea.
bPostgraduate student, Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Japan.
cProfessor, Department of Orthodontics, School of Dentistry, Kangnung National University, Korea.

Correspondence to: Nam-Ki Lee. Department of Orthodontics, School of Dentistry, Kangnung National University, 120, Gangneung Daehangno, Gangneung 210-702, Korea. +82 33 640 2756; Email: ortho0328@hanmail.net

Received: May 20, 2008; Revised: August 13, 2008; Accepted: August 16, 2008

Abstract

Objective

The purpose of this study was to evaluate the stress distribution in bone and displacement distribution of the miniscrew according to the length and number of the miniscrews used for the fixation of miniplate, and the direction of orthodontic force.

Methods

Four types of finite element models were designed to show various lengths (6 mm, 4 mm) and number (3, 2) of 2 mm diameter miniscrew used for the fixation of six holes for a curvilinear miniplate. A traction force of 4 N was applied at 0°, 30°, 60° and 90° to an imaginary axis connecting the two most distal unfixed holes of the miniplate.

Results

The smaller the number of the miniscrew and the shorter the length of the miniscrew, the more the maximum von Mises stress in the bone and maximum displacement of the miniscrew increased. Most von Mises stress in the bone was absorbed in the cortical portion rather than in the cancellous portion. The more the angle of the applied force to the imaginary axis increased, the more the maximum von Mises stress in the bone and maximum displacement of the miniscrew increased. The maximum von Mises stress in the bone and maximum displacement of the miniscrew were measured around the most distal screw-fixed area.

Conclusions

The results suggest that the miniplate system should be positioned in the rigid cortical bone with 3 miniscrews of 2 mm diameter and 6 mm length, and its imaginary axis placed as parallel as possible to the direction of orthodontic force to obtain good primary stability.

Keywords: Miniplate, Anchorage, Primary stability, Finite element analysis