치과용 자석부착장치의 물리적, 생물학적 특성에 관한 연구
A STUDY ON THE PHYSICAL PROPERTIES AND BIOLOGICAL CHARACTERISTICS OF DENTAL MAGNETIC ATTACHMENTS
임용식, 김영수, 김창회, 김영호,
소속 상세정보
임용식 ( Lim Yong-Sik ) - 서울대학교 치과대학 치과보철학교실
김영수 ( Kim Yung-Soo ) - 서울대학교 치과대학 치과보철학교실
김창회 ( Kim Chang-Whe ) - 서울대학교 치과대학 치과보철학교실
김영호 ( Kim Yong-Ho ) - 서울대학교 치과대학 치과보철학교실
KMID : 0362419990370010001
Abstract
In order to investigate various physical and biological properties of dental magnetic attachments studies on retentive characteristics, corrosion properties, cytotoxicity of different magnetic systems for dental applications were done. For the study of retentive characteristics changes of retentive force by increasing air gap, wear properties of various attachment systems and loss of magnetic force by heat treatment were measured. For the study of corrosion property of magnet covering metal electrochemical corrosion was done in artificial saliva and 0.9% NaCl solution between -1,000 mVSCE and +1,000 mVSCE. Anodic polarization curves are obtained about 6 types of samples and 2 types of solution. Corroded surfaces were examined with metallurgical microscope, scanning electron microscope and surface profilometer. For the study of cytotoxicity of magnetic attachment and its field cell growth and agar overlay test were done. The results of this study were as follows. 1.In Magnetic attachments using closed circuit retentive force at zero air gap was greater than magnets using open circuit, but decrease of retentive force by increasing air gap was also greater than open systems. 2.After 40,000 cycles of wear test all mechanical attachment resulted in varing degree of retention loss but in magnetic attachments no loss of retentive force was observed. 3.The magnetic attachment using Neodymium magnet showed early loss of retentive force about 200degrees C but attachment using Samarium magnet showed some resistance to heat treatment and complete retention loss was observed about 500degrees C. The keeper was not influenced by heat treatment in retention. 4.In electrochemical corrosion test Dyna magnetic attachment covering metal showed the highiest corrosion resistance and Shiner magnet covering metal showed the least corrosion resistance and examination of corroded surface with metallurgical microscope, scanning electron microscope and surface profilometer also showed same results with anodic polarization curves. 5.The result of cell culture tests on the magnet covered with metal showed least recognizable cytotoxicity.
키워드
Dental magnetic attachment; Retentive force; Electrochemical corrosion; Cytotoxicity
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