Evaluation of plasticity and radiopacity of elastic separators by means of traction tests and radiography

Abstract

INTRODUCTION: Elastic separators are widely used in the orthodontic clinic, in different sizes and thicknesses. Their function is to promote the separation between the teeth that will receive orthodontic bands, however, when subgingivally lost, they may cause periodontal problems and, ultimately, cause tooth extraction. OBJECTIVE: Concerned not only about their function but also about their properties, this experimental work was performed in order to evaluate, with a clinical perspective, the plasticity and radiopacity of the elastic separators, usually used in orthodontic clinic, through physical traction tests and radiographs. METHODS: Six different brands were analyzed and divided in two groups: extruded separators (American Orthodontics, GH, Morelli Blue and Morelli Green) and modular separators (Abzil, Dentaurum, GAC, Blue Modular Morelli and Green Modular Morelli). The plasticity was evaluated after physical traction tests, stretching the separators to 3 times their initial diameter. While the radiopacity was assessed using x-rays. RESULTS: When stretched to three times their inner diameter (ID), the extruded separators American Orthodontics, GH, Morelli Blue and Morelli Green and the modular ones Dentaurum, Morelli Blue Modular and Morelli Green Modular, presented elastic deformation, recovering their original inner diameter. The modular separators from Abzil and GAC showed permanent plastic deformation. With respect to radiopacity, the Abzil, American Orthodontics, Dentaurum, GAC and GH separators were radiopaque. CONCLUSION: Correlating the results concerning the plasticity and radiopacity, the separators which showed the most satisfactory results on both tests were, among the extruded separators, American Orthodontics and GH, and among the modular separators, GAC and Dentaurum.

Evaluation of different mouthwashes through their effect on their influence on the force loss of orthodontic elastic ligatures

“…During orthodontic attachment bonding, increased amounts of Streptococcus mutans and lactobacilli are identified in the oral cavity [2]. Nowadays, synthetic elastic modules (often referred to as plastic modules) are used in numerous fields of orthodontics [3]. The elastomeric material's smooth surface offers an irritant-free system.…”

The Efficacy of Laser Therapy and Ibuprofen on Pain After Elastomeric Separator Placement: Rapid Review

“…1 The use of elastic separators is widely spread in orthodontic treatment, not only for their convenience in handling, but also due to storage, and produced significantly more space compared to the spring separators. 1,2 Placement of separator induces pain in patients. Pain usually begins at 4 hours after separator placement, increases to a peak level at 24 hours, remains bother for the next 3 days, and diminishes over the next 6-8 days.…”

Ligaduras ortodônticas elastoméricas estéticas: alteração de cor, ultraestrutura da superfície (MEV) e propriedade elástica após uso de dentifrício clareador (estudo in vivo)

“…Estudos com elásticos intra-orais, elásticos em corrente ou elásticos de separação geralmente utilizam uma amostra maior, especialmente aqueles realizados in vitro (Stevenson e Kusy, 1994;Russel et al, 2001;Mendes et al, 2012, Vieira et al, 2013. Na presente pesquisa, por seu caráter in vivo, após a apreciação da literatura e do projeto de pesquisa, o cálculo amostral indicou que uma amostra de 20 pacientes seria suficiente para produzir resultados confiáveis.…”