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Effects of recycling on the biomechanical characteristics of retrieved orthodontic miniscrews

 Soon-Dong Yun  ;  Sung-Hwan Choi  ;  Jung-Yul Cha  ;  Hyung-Seog Yu  ;  Kwang-Mahn Kim  ;  Jin Kim  ;  Chung-Ju Hwang 
 Korean Journal of Orthodontics (대한치과교정학회지), Vol.47(4) : 238-247, 2017 
Journal Title
 Korean Journal of Orthodontics (대한치과교정학회지) 
Issue Date
Biomechanical characteristics ; Recycling ; Retrieved orthodontic miniscrew ; Surface characteristics
OBJECTIVE: The aim of this study was to compare recycled and unused orthodontic miniscrews to determine the feasibility of reuse. The comparisons included both miniscrews with machined surfaces (MS), and those with etched surfaces (ES). METHODS: Retrieved MS and ES were further divided into three subgroups according to the assigned recycling procedure: group A, air-water spray; group B, mechanical cleaning; and group C, mechanical and chemical cleaning. Unused screws were used as controls. Scanning electron microscopy, energy-dispersive X-ray spectrometry, insertion time and maximum insertion torque measurements in artificial bone, and biological responses in the form of periotest values (PTV), bone-implant contact ratio (BIC), and bone volume ratio (BV) were assessed. RESULTS: Morphological changes after recycling mainly occurred at the screw tip, and the cortical bone penetration success rate of recycled screws was lower than that of unused screws. Retrieved ES needed more thorough cleaning than retrieved MS to produce a surface composition similar to that of unused screws. There were no significant differences in PTV or BIC between recycled and unused screws, while the BV of the former was significantly lower than that of the latter (p < 0.05). CONCLUSIONS: These results indicate that reuse of recycled orthodontic miniscrews may not be feasible from the biomechanical aspect.
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2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral Pathology (구강병리학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
김광만(Kim, Kwang Mahn) ORCID logo https://orcid.org/0000-0002-5235-0294
김진(Kim, Jin)
유형석(Yu, Hyung Seog) ORCID logo https://orcid.org/0000-0002-1275-5078
차정열(Cha, Jung Yul)
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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