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ISRN DentistryVolume 2011 2011, Article ID 536089, 5 pages

Research Article

Department of Orthodontics, State University of Rio de Janeiro, 20551-030 Rio de Janeiro, Brazil

Department of Material Sciences, Military Institute of Engineering, 22290-270 Rio de Janeiro, Brazil

Received 30 April 2011; Accepted 15 May 2011

Academic Editors: C. P. Lin and A. Vissink

Copyright © 2011 Daniel J. Fernandes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To evaluate force extension relaxation of different brands and diameters of latexelastics subjected to static tensile testing under an apparatus designed to simulateoral environments, sample sizes of 5 elastics from American Orthodontics AO, Tp, and Morelli Orthodontics Mo of equivalent medium force, 3-16, 1-4, and 5-16 inch size were tested. The forces were read after 1-, 3-, 6-, 12- and 24-hour periods inEmic testing machine with 30 mm-min cross-head speed and load cell of 20 N. Two-way ANOVA and Bonferroni tests were used to identify statistical significance. There were statistically differences among different manufacturers at allobservation intervals 𝑃 < 0 . 0 0 0 1 . The relationships among loads at 24-hour timeperiod were as follows: Morelli>AO>Tp for 3-16, 1-4, and 5-16 elastics. The forcedecay pattern showed a notable drop-off of forces until 3 hours, a slight increase insome groups from 3–6 hours and a more homogeneous force pattern over 6–24hours.

Autor: Daniel J. Fernandes, Gisele M. Abrahão, Carlos N. Elias, and Alvaro M. Mendes



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