Force decay in orthodontic elastomeric chains after immersion in disinfection solutions

Abstract

Aim:To evaluate the force decay of orthodontic elastomeric chains after immersion in disinfecting solutions. Methods: One-hundred and fifty segments of elastomeric chains were divided in 3 groups: Control group -no disinfection; Chlorhexidine group -disinfection in 0.12% chlorhexidine digluconate solution; and Peracetic acid group -disinfection in 0.2% peracetic acid solution. Elastomeric chains of 14 mm were stretched up to 20 mm and the given force (kgf) was evaluated in an Instron universal testing machine at the following intervals: 1 h, 1 day, 7, 14, 21 and 28 days after the immersion in the disinfecting solutions. Data (kgf) were analyzed statistically by Analysis of Variance and Tukey's test at a 5% significance level. Results: Both groups presented similar force decay along 7 days and remained stable up to 28 days. Force degradation was observed in the first hours of activation (~50%). Conclusions: It may be concluded that there were no significant differences among the investigated groups, in most interval times, indicating that both chemical solutions can be used for previous disinfection of orthodontic elastomeric chains.

A Novel Spring for Impacted Canine Traction: A New Method presentation

“…The main advantage is the ease of use, less bulk and patient comfort (17). In contrast, chains have some drawbacks such as: inability of producing light-continuous force which is the ideal force for tooth movement; and force decay (18). Degradation, rupture and force cut off are always probable (19) and one of the main problems is the periodontal and gingival concerns because of poor hygiene (20).…”

Orthodontic instruments and supplies: Are they semicritical or critical items?

“…13 Polyurethane elastic chains and ligatures are subject to contamination, but spool dispensers for chains, ligature assembly for the treatment of a single patient, and cold sterilization are ways of reducing this (Fig 2B ); unfortunately, elastic chains and ligatures are not heat resistant and their repeated disinfection can accelerate the destruction of the cross-links of polyurethane polyesters. 3,4 Recently, Losito et al 14 reported that immersion in chlorhexidine solution (0.12% for 10 minutes) or peracetic acid solution (0.2% for 30 minutes) has no significant effect on the degradation of elastic chains.…”

Effect of sodium fluoride in chlorhexidine mouthwashes on force decay and permanent deformation of orthodontic elastomeric chain

“…The orthodontics elastomeric chain is polyurethane elastomer that widely used among orthodontists. 1,2 It is a long chain with an interconnected hole, and available in various colors. 3 Due to its elastic ability, orthodontics elastomeric chain can return to its original dimensions when subjected to deformation forces.…”

“…3 Due to its elastic ability, orthodontics elastomeric chain can return to its original dimensions when subjected to deformation forces. 2,4 Orthodontics elastomeric chain are used in any movement that requires pulling, such as tooth derotation, canine and incisor retraction, mild space closure, midline correction, mesial displacement in the posterior quadrants, and traction of impacted teeth. 5,6 According to the length of filament, orthodontics elastomeric chain divided into closed chain, short link chain, medium link chain and long link chain.…”

“…3,8,9 However, the disadvantage is that the force produced is irreversible so it must be replaced after some time. 2,3 Deformation, force decay and relaxation behaviors of orthodontics elastomeric chain are also dependent on environmental factors like teeth movement, temperature changes, environmental pH, mouthwashes, salivary enzymes and mastication forces. 10 Studies have shown that the elastics tested in a humid medium underwent greater degradation than those tested in a dry medium.…”