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Biomechanical chracteristics and reinsertion guidlines for retrieved orthodontic miniscrews

Authors
 Chooryung J. Chung  ;  Kil-Young Jung  ;  Yoon Jeong Choi  ;  Kyung-Ho Kim 
Citation
 ANGLE ORTHODONTIST, Vol.84(5) : 878-884, 2014 
Journal Title
 ANGLE ORTHODONTIST 
ISSN
 0003-3219 
Issue Date
2014
MeSH
Adult ; Aluminum/analysis ; Biomechanical Phenomena ; Bone Screws* ; Calcium/analysis ; Carbon/analysis ; Equipment Contamination ; Female ; Humans ; Male ; Microscopy, Electron, Scanning ; Miniaturization ; Orthodontic Anchorage Procedures/instrumentation* ; Orthodontic Appliance Design ; Oxygen/analysis ; Phosphorus/analysis ; Spectrometry, X-Ray Emission ; Stress, Mechanical ; Surface Properties ; Time Factors ; Titanium/analysis ; Torque
Keywords
Miniscrew ; Reinsertion ; Relocation ; Temporary anchorage device
Abstract
Objectives: To analyze morphological variations of retrieved orthodontic miniscrews and to evaluate the mechanical properties that may adversely affect relocation of miniscrews. Materials and Methods: Retrieved miniscrews were classified with scanning electron microscopy according to the degree of morphological deformation of the tip. To evaluate the differences in mechanical characteristics during reinsertion, changes in insertion torque, insertion time and differences in successful insertion load were compared between unused controls and retrieved miniscrews. In addition, surface composition analysis of retrieved miniscrews was performed using energy-dispersive x-ray spectroscopy. Results: Significant tip deformation was evident in the majority (>84.5%) of retrieved miniscrews. Initial conditions such as insertion site or duration of insertion were not associated with the presence of tip deformation. Insertion load for successful bone penetration increased in proportion to the degree of tip deformation; however, serial changes in insertion torque were similar to those of the controls. Deposited debris such as carbon, calcium, and phosphorus was noted on the retrieved miniscrews. Conclusion: Miniscrews retrieved after primary insertion exhibited decreased cutting ability due to deformation of the tip structure, as well as surface contamination.
Full Text
http://www.angle.org/doi/full/10.2319/092613-703.1
DOI
10.2319/092613-703.1
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Kyung Ho(김경호) ORCID logo https://orcid.org/0000-0002-8154-2041
Chung, Chooryung J.(정주령) ORCID logo https://orcid.org/0000-0001-9399-7193
Choi, Yoon Jeong(최윤정) ORCID logo https://orcid.org/0000-0003-0781-8836
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/99523
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