Evaluation of Different Bracket's Resistance to Torsional Forces from Archwire

Abstract

ABSTRACT Aim The present study was aimed to evaluate the resistance to deformation or fracture of brackets of various materials (ceramic, ceramic reinforced with metal slot, and stainless steel brackets) with archwires during application of torque. Materials and methods The sample size included 30 brackets of maxillary right central incisor with slot dimension of 0.022 × 0.028ʺ and made of three materials (10 of each type): (1) Ceramic brackets (cer), (2) ceramic brackets reinforced with stainless steel slot (cer/ss), and (3) stainless steel brackets (metal). Thirty stainless steel archwire segments of 0.019 × 0.025ʺ SS 5 cm in length were used. Elastomeric ties were also used in this study. Results Highest to lowest deformation or fracture torque found is as follows: Stainless steel brackets (5713.2 gfmm), metal ceramic reinforced with metal slot brackets (4080.8 gfmm), and ceramic brackets (3476 gfmm). Conclusion Stainless steel brackets showed significantly higher values of torsional load than ceramic brackets reinforced with metal slot and ceramic brackets. Clinical significance Clinically orthodontic treatment is based on specific force applications to the dentition, the maxilla and the mandible. In order to obtain these forces, orthodontic brackets are attached to the teeth. Most commonly used brackets are metal (stainless steel), ceramic, and combination of metal reinforced ceramic brackets. For successful orthodontic treatment, it is necessary to maintain proper torque and avoid torque loss. Torque loss leads to deepening of bite. Torque loss occurs due to many reasons, one of them being bracket failure to withstand applied torque. How to cite this article Khanapure CC, Ayesha S, Sam G, Kumar VJA, Deepika C, Ahmed H. Evaluation of Different Bracket's Resistance to Torsional Forces from Archwire. J Contemp Dent Pract 2016;17(7):564-567.