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IP Indian Journal of Orthodontics and Dentofacial Research

Comparative Assessment of Torque Expression of Stainless Steel, Nickel Titanium, Heat Activated Nickel Titanium and Titanium Molybdenum Alloy Wires - A Finite Element Method Study

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Author Details: Santosh Ramegowda, Anju Babu, Shailaja A.M, Shashanka P. Kumar

Volume : 2

Issue : 1

Online ISSN : 2581-9364

Print ISSN : 2581-9356

Article First Page : 5

Article End Page : 13


Objective: To assess and compare the torque values of different wires - Stainless Steel, Nickel Titanium, Heat Activated Nickel Titanium and Titanium Molybdenum alloy using Finite Element Analysis.
Methods: Three-dimensional model of a maxillary right central incisor tooth was made with the surrounding periodontal ligament and alveolar bone. Three dimensional CAD models of a MBT 0.022’’ slot bracket, 8mm long 0.019x0.025” and 0.021x0.025” orthodontic wires were also made using the CATIA V5 R21 software. After the models were meshed with the Hyper mesh software, mechanical properties such as Young’s modulus and Poisson’s ratio of tooth, compact bone, spongy bone, periodontal ligament, Stainless Steel, NiTi, HANT and TMA wires were assigned to the finite element model. The torques expressed in the central incisor by the different arch wires were recorded using ABAQUS 6.14 FEM software.
Results: The finite element analysis indicated that for each of the four different type of materials , stainless steel wire produced the highest angular displacement followed by TMA, then NiTi and HANT when it was placed in the 0.022” slot bracket for both 0.019x0.025” and 0.021x0.025” wires. 0.019x0.025” stainless steel expressed the highest angular displacement of 1.2456° in the 0.22” slot bracket whereas 0.019x0.025” TMA displayed an angular displacement of 1.2450°, 0.019x0.025” NiTi 1.1996° and 0.019x0.025” HANT 1.1207° when engaged in 0.022” bracket slot. The angular displacement of a 0.021x.025”SS wire when placed in 0.022” slot bracket is 1.4560° which is the highest when compared to TMA, NiTi and HANT wires of the same dimension. HANT wire showed the least angular displacement of 1. 2262° when compared to TMA and NiTi which showed an angular displacement of 1.4074° and 1.3352° respectively.
Conclusion: According to the result of this finite element study, Stainless steel yielded the largest torque expression, followed by TMA and NiTi and then HANT.

Key words
: Finite Element Method (FEM), HANT, NiTi, Stainless Steel, Torque expression, TMA