Back to Search
Start Over
THE EFFECT OF CYCLIC STRETCHING SPEED ON THE FORCE DEGRADATION OF ORTHODONTIC ELASTIC BANDS.
- Source :
-
Journal of Mechanics in Medicine & Biology . Mar2013, Vol. 13 Issue 1, p-1. 12p. - Publication Year :
- 2013
-
Abstract
- This study evaluated the effect of the cyclic stretching speed on the force degradation of orthodontic elastics. Forty-five natural rubber bands (3M Unitekā¢) were stretched at different speeds in three groups: (1) static stretching test, (2) cyclic stretching test at a speed of 80 mm/min, and (3) cyclic stretching at a speed of 160 mm/min. A material tester and customized strain gauge were used to measure the residual force of the elastics in 37°C artificial saliva at different times. One-way repeated-measure analysis of variance followed by Scheffe's post-hoc comparison and t-test were used for statistical analysis. In Group 1, the force of the elastics degraded with time, with two separate phases being observed - distinctive degradation after 15 min and stabilization after 120 min. The cyclic stretching in Group 2 produced a significant deviation in the residual force and the initial force from the first minute, and stabilization after 300 min. After 1,440 min, 60% of the bands had snapped. Under accelerated stretching, no areas of relative stability were observed between the start of stretching to the start of breaking. After 1,440 high-speed stretches, 87% of the elastics in Group 3 snapped. These results indicate that the stretching speed affects the stability of the residual force of elastics. Cyclic stretching at high speed immediately induces a rapid degradation of the elastic's force and increases its probability of breakage. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02195194
- Volume :
- 13
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Mechanics in Medicine & Biology
- Publication Type :
- Academic Journal
- Accession number :
- 84697134
- Full Text :
- https://doi.org/10.1142/S0219519413500176