Effect of rotation bump on removal torque of orthodontic mini-implants
Gansukh Odontuya, Jeong Jong-Wha, 김종완, 김영균, 이종호, 김태우,
소속 상세정보
( Gansukh Odontuya ) - Seoul National University School of Dentistry Department of Orthodontics
( Jeong Jong-Wha ) - Seoul National University School of Dentistry Department of Orthodontics
김종완 ( Kim Jong-Wan ) - Seoul National University Bundang Hospital Section of Dentistry Department of Orthodontics
김영균 ( Kim Young-Kyun ) - Seoul National University Bundang Hospital Section of Dentistry Department of Oral and Maxillofacial Surgery
이종호 ( Lee Jong-Ho ) - Seoul National University School of Dentistry Department of Oral and Maxillofacial Surgery
김태우 ( Kim Tae-Woo ) - Seoul National University School of Dentistry Department of Orthodontics
KMID : 0355620130390060269
Abstract
Objectives: This study is designed to evaluate the mechanical stability of orthodontic mini-implants with vertical grooves in rabbits.
Materials and Methods: This study was done from March 2011 to February 2012 in Dental Research Institute of Seoul National University. Thirty-two mini-implants in the control group and 32 in the rotation bump (RB) group were inserted in the tibias of 16 rabbits and were removed after two weeks and four weeks, respectively. The maximum insertion torque (MIT), maximum removal torque (MRT), torque ratio (TR) of MRT to MIT and removal angular momentum (RAM) were all measured at the time of removal.
Results: There were no significant differences between the two groups in MIT and MRT at two weeks or four weeks. However, TR and RAM at four weeks in the RB group were significantly higher than in the control group (P<0.05). TR of the RB group was significantly increased at four weeks (P<0.05). In both groups, RAM at four weeks was significantly higher than at two weeks (P<0.05).
Conclusion: These results suggest that RB of the mini-implant could provide resistance to the removal rotation, although it did not increase the MRT.
키워드
Mini-implant; Rotation bump; Torque; Torque ratio; Angular momentum
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