Force Degradation of Elastomeric Chains after Storage Time and Mechanical Brushing.

Antonio Carlos Da Silva Chaves-Filho,Américo Bortolazzo Correr,Eduardo Cesar Almada Santos,Ana Rosa Costa,Silvia Amélia Scudeler Vedovello,Lincoln Pires Sousa Borges,Marcus Vinicius Crepaldi,Lourenço Correr-Sobrinho

doi:10.1590/0103-6440202104487

Antonio Carlos Da Silva Chaves-Filho, Américo Bortolazzo Correr + Show 6 more

Open Access

https://doi.org/10.1590/0103-6440202104487

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Abstract

The purpose of this in vitro study was to evaluate the force decrease of different elastomeric chains after different times: initial, 10 minutes, 1 day, 28 days and after mechanical brushing. Twenty orthodontic elastomeric chains segments were utilized for each commercial brand. Initially, the elastomeric chain of 15mm long were immediate stretched up to 20 mm in an Instron and the force was measured in gf. After all specimens were placed stretched on rectangular acrylic jigs with distance of 20 mm, immersed in deionized water at 37oC for 10 minutes and the force (gf) was measured again. Five test measurements of remaining force were made at the following time intervals: initial, 10 minutes, 1 day, 28 days and mechanical brushing. After 28 days, the acrylic plates with the specimens were adapted in the mechanical brushing machines (MSCT 3) and the elastomeric chains were submitted to mechanical brushing and the force (gf) measure again. The force (gf) was submitted to mixed-model ANOVA and Sidak post-hoc test (α=0.05). A statistically significant reduction in the force was found for all orthodontic elastomeric chain types after 1 day, 28 days and mechanical brushing (p<0.05). Morelli and 3M Unitek elastomeric chains showed significantly higher force than Abzil and GAC (p<0.05) after 1 day, 28 days and mechanical brushing. In conclusion, the force delivered by all elastomeric chains decayed rapidly over time. Morelli and 3M Unitek elastomeric chains consistently had a significantly greater force after mechanic brushing, while GAC the lowest.

Highlights

The elastomeric chains are used extensively in orthodontics for intra-arch teeth movement
Previous studies showed that the force degradation of different orthodontic elastics may be influenced by many factors, such as time, mastication, pre-stretch, exposure to heat, color (12), temperatures (13), saliva (7), different pH (14), and alcohol concentrations in mouthwashes (2,9)
Afterwards, the orthodontic elastomeric chains segments were placed in a universal mechanical testing machine (Model 4411; Instron, Canton, USA) and submitted to distention in 20 mm at a crosshead speed of 5.0 mm/minute (2,17) and the force was measured in gf

Summary

Introduction

The elastomeric chains are used extensively in orthodontics for intra-arch teeth movement. They are practical, low cost, and comfortable for patients, effective in diastemas closing, correcting rotations, shifting the midline, achieving general space closure and removal requires little chair time for the dentist (1,2). Their using is larger, due to these factors and high degree of professional acceptance. The aim of this in vitro study was to evaluate the force decrease of five elastomeric chains brands evaluated initial, 10 minutes, 1 day, and 28 days and submitted to simulated mechanical brushing. Two hypotheses were tested: 1) The storages periods and mechanical brushing will not affect the force decrease of all elastomeric chains brands; 2) No significant difference in force will be observed among all elastomeric chain brands

Material and Methods

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Discussion