Abstract
BackgroundThe purpose of this study was to evaluate the deflection forces of 0.016-inch Nitinol and stainless steel orthodontic wires, in association to different self-ligating brackets.Material and MethodsSpecimens were mounted in a clinical simulation model and evaluated in a Universal Testing Machine (INSTRON 3342), using a 10N load cell and ISO 15,841, as a protocol. Eight of these models were prepared, each one for the bonding of each set of self-ligating accessories to be tested: Damon Q, Damon Clear (Ormco), In-Ovation R, In-Ovation C (GAC), BioQuick, QuickClear (Forestadent), SmartClip and Clarity SL (3M). Data were subjected to One-way ANOVA, followed by Tukey tests (P<0.05).ResultsElastic deflection results showed that the deactivation forces increased with increase in wire deflection in the different brackets evaluated. For the different combinations, Clarity SL generated the greatest force and Damon Clear presented the lowest force when compared to the other brackets in all alloys and deflections. BioQuick and QuicKlear were those with the most similar behavior with each other.ConclusionsStrength values increased with gradual increase in wire deflection in all evaluated brackets. Clarity SL generated the greatest and Damon Clear the lowest force when compared to the other brackets in all alloys and deflections tested. Key words:Brackets, orthodontic wires, deflection.
Highlights
Nowadays, having a natural and pleasant smile even during orthodontic treatment is one of patients’ main concerns
It is necessary to assess the friction related to different bracket systems and the behavior of different currently available orthodontic materials regarding the forces applied during orthodontic mechanics
Because all variables showed normal distribution, the following tests were used: Comparison among different self-ligating brackets in Results -Results of different self-ligating bracket types and nickel-titanium orthodontic wires In general, it was observed that the deactivation force increased with the increase in amount of deflection (Table 2)
Summary
Nowadays, having a natural and pleasant smile even during orthodontic treatment is one of patients’ main concerns. To make the best choice among the various brackets and orthodontic wires available, it is essential to know the magnitude of forces released by these wires and their behavior in relation to the gradual increase of wire deflection [8]. This in vitro study assessed deflection forces of 0.016inch caliber Nitinol and stainless steel orthodontic wires, placed in self-ligating brackets, by using a clinical simulation model and following ISO 15,841 as protocol. Deflection of the orthodontic wire was performed in a clinical simulation device representing all 10 teeth of the maxillary arch [9].
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