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Comparative Analysis on Initial Stability and Clinical Applicability of Zirconia and Titanium Alloy Orthodontic Micro-implants : 지르코니아와 타이타니움 합금 교정용 마이크로 임플란트의 초기 안정성과 임상 적용성에 관한 비교 연구

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Authors

최혜원

Advisor
이상훈
Major
치의학대학원 치의과학과
Issue Date
2017-08
Publisher
서울대학교 대학원
Keywords
Micro-implantsZirconia implantTemporary anchorage deviceMechanical stability
Description
학위논문 (박사)-- 서울대학교 대학원 치의학대학원 치의과학과, 2017. 8. 이상훈.
Abstract
The aim of this study was to compare the initial stability as insertion and removal torque and the clinical applicability of novel orthodontic zirconia micro-implants made using powder injection molding (PIM) technique with those parameters in conventional titanium micro-implants. Sixty zirconia and 60 titanium alloy micro-implants of similar design (1.6-mm diameter, 8.0-mm length) were inserted perpendicularly in solid polyurethane foam with varying densities of 20 pounds per cubic foot (pcf), 30 pcf, and 40 pcf. Primary stability was measured as maximum insertion torque (MIT) and maximum removal torque (MRT). To investigate clinical applicability, compressive and tensile forces were recorded at 0.01 mm, 0.02 mm, and 0.03 mm displacement of the micro-implants at angles of 0°, 10°, 20°, 30°, and 40°. The biocompatibility of zirconia micro-implants was assessed via an experimental animal study. There were no statistically significant differences between zirconia micro-implants and titanium alloy implants with regard to MIT, MRT, or the amount of movement in the angulated lateral displacement test. As angulation increased, the mean compressive and tensile forces required to displace both type of micro-implants increased substantially at all distances. The average bone-to-implant contact ratio of prototype of zirconia micro-implants was 56.88 ± 6.72%. Zirconia micro-implants showed comparable initial stability and clinical applicability to that of titanium micro-implants for diverse orthodontic treatments, under compressive and tensile forces.
Language
English
URI
https://hdl.handle.net/10371/137209
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