학술논문
Temperature-dependence of the mechanical properties of FRP orthodontic wire.
Document Type
Academic Journal
Author
Imai T; Department of Orthodontics, Hokkaido University, Sapporo, Japan.; Yamagata S; Watari F; Kobayashi M; Nagayama K; Toyoizumi H; Uga M; Nakamura S
Source
Publisher: Japanese Society for Dental Materials and Devices Country of Publication: Japan NLM ID: 8309299 Publication Model: Print Cited Medium: Print ISSN: 0287-4547 (Print) Linking ISSN: 02874547 NLM ISO Abbreviation: Dent Mater J
Subject
Language
English
ISSN
0287-4547
Abstract
The temperature-dependence of the mechanical properties of a new esthetic orthodontic wire with fiber-reinforced plastic (FRP) structure was investigated. The new FRP wire, fabricated by a hot drawing method, is 0.5 mm in diameter and has a multiple fiber structure composed of biocompatible CaO-P2O5-SiO2-Al2O3 glass fibers of 20 microns in diameter and a polymethyl methacrylate matrix. The flexural load at a deflection of 1 mm and Young's modulus at 24, 37, and 50 degrees C under wet conditions showed similar fiber fraction dependence to those under dry conditions for a fiber fraction of 40-51%. The flexural load and Young's modulus tended to decrease slightly with increases in temperature. This tendency was larger for the lower fiber fraction. However, the difference in flexural load for a temperature difference of between 24 degrees C and 50 degrees C was at most 10 gf. This is negligibly small, and a constant orthodontic force regarding temperature change would be advantageous from a clinical point of view.