Accession Number:

ADA218135

Title:

Surface Modification of Orthodontic Bracket Models via Ion Implantation: Effect on Coefficients of Friction

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1989-01-01

Pagination or Media Count:

90.0

Abstract:

In an effort to reduce the unwanted effects of friction, ion implantation of bracket models was accomplished and tested against the four major orthodontic alloy groups, stainless steel S.S., cobalt-chromium Co-Cr, nickel-titanium NiTi, and beta-titanium. Stainless steel right-hand cylinders simulated orthodontic brackets. In addition to control samples, the polished faces of these cylinders were implanted with N, TiN, NC, NCr, Ti, TiC, and C. Frictional forces were measured, and both the coefficient of static friction, mus, and the coefficient of kinetic sliding friction, muk , were determined while varying the normal forces from 0.2 to 1kg. The kinetic coefficients of the arch wires against the control S.S. models measured 0.163, 0.143, 0.240, and 0.312, respectively P or 0.01. Results reveal that, with few exceptions, the S.S. control cylinders yielded lower muks than the implanted cylinders. Any improvement seen with the implantations were marginal at best. Theses.

Subject Categories:

  • Medical Facilities, Equipment and Supplies
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE