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. 2022 Jul;14(Suppl 1):S143-S147.
doi: 10.4103/jpbs.jpbs_712_21. Epub 2022 Jul 13.

Computation and Collation of Torque Expression in 0.018 Inch and 0.022 Inch Preadjusted Bracket Slots on Passive Insertion of Full-Size Archwire: A Finite Element Study

A Anand Kumar  1 , Sharmila Sekar  1 , S Sathesh Kumar  1 , G Divakar  1 , Kumaran Vijayarangam  1 , S Arulselvi  1
Affiliations

Computation and Collation of Torque Expression in 0.018 Inch and 0.022 Inch Preadjusted Bracket Slots on Passive Insertion of Full-Size Archwire: A Finite Element Study

A Anand Kumar et al. J Pharm Bioallied Sci. 2022 Jul.

Abstract

Aim: To quantify and compare the prescribed torque expressed in preadjusted edgewise 0.018-inch and 0.022-inch bracket slot on passive insertion of full-size archwire using finite element method.

Materials and methods: Geometric model of the maxillary arch created with dimensions of the brackets and archwires scanned using microcomputed tomography were converted to finite element model using HYPERMESH V 12.0 software. Material properties were assigned and boundary conditioning was given. 0.017 × 0.025 inch, 0.018 × 0.025 inch, 0.019 × 0.025 inch, 0.021 × 0.025 inch stainless steel wires were inserted and ligated using 0.010 inch stainless steel wire. The amount of torque in each wire was quantified and compared.

Results: 0.018 × 0.025-inch stainless steel archwire in 0.018-inch slot expressed more torque than 0.017 × 0.025-inch wire; in 0.022-inch slot 0.021 × 0.025-inch wire showed more torque. Torque expression in 0.018-inch slot was more than 0.022-inch slot. Torque expressed was less than the prescribed value in both bracket slots.

Keywords: Archwire; bracket slot; finite element method; torque.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
Interior view of Zeiss Xradia, Versa XRM 500, and mounting of sample
Figure 2
Figure 2
Scanning of brackets using microcomputed tomography
Figure 3
Figure 3
Creation of geometric model of brackets from DICOM images
Figure 4
Figure 4
Creation of geometric model of buccal tubes from DICOM images
Figure 5
Figure 5
Creation of geometric model of maxillary arch-occlusal view
Figure 6
Figure 6
Finite element model of the maxillary arch with boundary conditioning and load application
Figure 7
Figure 7
Torque expression of central incisor in 0.018 × 0.025-inch slot (a) 0.017 × 0.025 inch archwire (b) 0.018*0.025 inch archwire. Torque expression of central incisor in 0.022 × 0.025-inch slot (c) 0.019 × 0.025 inch archwire (d) 0.021*0.025 inch archwire
Graph 1
Graph 1
Comparison between groups based on various wires
See this image and copyright information in PMC

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