GET THE APP

Effect of Different Prestretchings on Force Decay of Synthetic Orthodontic Elastomeric Modules at Different Time Intervals (An In vitro Study) | Abstract

Journal of Research in Medical and Dental Science
eISSN No. 2347-2367 pISSN No. 2347-2545

All submissions of the EM system will be redirected to Online Manuscript Submission System. Authors are requested to submit articles directly to Online Manuscript Submission System of respective journal.

Effect of Different Prestretchings on Force Decay of Synthetic Orthodontic Elastomeric Modules at Different Time Intervals (An In vitro Study)

Author(s): Safa Munir Abdulsattar*, Iman I Al-Sheakhli

Abstract

Background: This study aims to investigate the effect of prestretching on the force degradation of elastomeric chains. Materials and methods: 500 samples from Ormco company both generation I and generation II elastics were divided into control and experimental groups for prestretching including 1 time 50% prestretching, 3 times 50% prestretching, 1 time 75% prestretching and 3 times 75% prestretching groups. Experimental groups are prestretched in one or three stretchings in quick sequential manner using dental clamp holder inside boxes made to give an increase of 50% or 75% of the elastics initial length. Samples were applied to pins fixed in acrylic plates made with a fixed distance so that all control samples deliver 200 grams of force initially. Samples were stored in artificial saliva at 37C in an incubator. Forces were measured at five-time intervals. Statistical analysis included one-way analysis of variance ANOVA test, Tukey HSD test, and independent t-test. Results: Pattern of force degradation was similar in all durations being higher in control group followed by 1 time 50% prestretching, 3 times 50% prestretching, 1 time 75% prestretching and 3 times 75% prestretching group. There was non-significant difference between 1 time 50% prestretching and 3 times 50% prestretching and between 1 time 75% prestretching and 3 times 75% prestretching in most of the testing periods. Conclusion: Generation I elastics showed more force degradation than generation II in all groups and time intervals with more force decayed in the sixth week. 75% prestretching groups showed least force loss compared to 50% and control groups. Number of times of prestretching is of questionable clinical benefit.

Share this article