The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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A STUDY ON THE CHANCES OF FRICTIONAL FORCE BETWEEN BRACKET AND ORTHODONTIC WIRE WITH TIME IN ARTIFICIAL SALIVA

시간경과에 따른 교정용 bracket과 교정선 사이의 마찰력 변화에 관한 연구

  • Kwak, Chun (Department of Orthodontics, College of Dentistry, Pusan National University) ;
  • Kim, Jim-Bom (Department of Orthodontics, College of Dentistry, Pusan National University) ;
  • Son, Woo-Sung (Department of Orthodontics, College of Dentistry, Pusan National University)
  • 곽춘 (부산대학교 치과대학 교정학교실) ;
  • 김진범 (부산대학교 치과대학 예방치학교실) ;
  • 손우성 (부산대학교 치과대학 교정학교실)
  • Published : 1993.06.01
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Abstract

The friction of orthodontic appliances is recogonized to be detrimental to tooth movement. The purpose of this study was to determine the magnitude of frictional force changes between bracket$(018'\times025'\;solt)$ and orthodontic wires(stainless steel, cobalt-chromium, and $\beta-titanium$, $017'\times0.25'$ rectangular) with time. The wire was secured in the bracket slot with a elastomeric ligature. Frictional forces were measured by universal testing machine. The following conclusions were obtained. 1. The frictional forces under dry condition were greater than those in saliva. 2. The frictional forces produced by cobalt-chromium wire were less than those generated by stainless steel and $\beta-titanium$ wire. 3. The frictional forces increased progressively with time, and the amount of increase on first two weeks was greater than on last two weeks. 4. The change of frictional force under dry condition was greater than in artificial saliva.

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