Ayush, Sharma (2012) Evaluation of torque expression of four commercially available self-ligating brackets: A finite element study. Masters thesis, Ragas Dental College and Hospital, Chennai.
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Abstract
This FEM study was carried out to investigate the torque expression of different self-ligating brackets and arch wire combinations on the tooth and its supporting structures. Two Active (Innovation-R and Time) and Passive (Smart Clip 3 and Damon3MX) self-ligating bracket systems were selected and one conventional (Ovation) bracket system served as control. Upper Right Central Incisor Stainless Steel Roth Prescription bracket with slot dimension of 0.022 x 0.028 inches was used in all the groups. The brackets were tested against three S.S. archwire dimensions (0.017 x 0.025, 0.019 x 0.025 and 0.021 x 0.025 inches). A 3-dimensional model of the right maxillary central incisor and its supporting structures was generated from a Computed Tomography scan of a dry human skull by a CAD/CAE program. The brackets were scanned and 3-dimensional models were designed with Comet 5 White Light Scanner. The close geometric diagram for the bracket, tooth and its supporting structures was prepared using Ansys Workbench Version 11. The bracket of the maxillary central right incisor was rotated from the neutral position by a total of 20 degrees. The angle of engagement and the resultant forces (stress concentration) were evaluated at 0mm, 4mm, 8mm and 12mm from the apex for different archwire-bracket combinations were recorded using the same software. This FEM study was carried out to investigate the torque expression of different self-ligating brackets and arch wire combinations on the tooth and its supporting structures. Two Active (Innovation-R and Time) and Passive (Smart Clip 3 and Damon3MX) self-ligating bracket systems were selected and one conventional (Ovation) bracket system served as control. Upper Right Central Incisor Stainless Steel Roth Prescription bracket with slot dimension of 0.022 x 0.028 inches was used in all the groups. The brackets were tested against three S.S. archwire dimensions (0.017 x 0.025, 0.019 x 0.025 and 0.021 x 0.025 inches). A 3-dimensional model of the right maxillary central incisor and its supporting structures was generated from a Computed Tomography scan of a dry human skull by a CAD/CAE program. The brackets were scanned and 3-dimensional models were designed with Comet 5 White Light Scanner. The close geometric diagram for the bracket, tooth and its supporting structures was prepared using Ansys Workbench Version 11. The bracket of the maxillary central right incisor was rotated from the neutral position by a total of 20 degrees. The angle of engagement and the resultant forces (stress concentration) were evaluated at 0mm, 4mm, 8mm and 12mm from the apex for different archwire-bracket combinations were recorded using the same software.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | torque expression ; four commercially ; self-ligating brackets ; finite element study. |
| Subjects: | DENTAL > Orthodontics and Dentofacial Orthopedics |
| Depositing User: | Subramani R |
| Date Deposited: | 09 Oct 2018 14:35 |
| Last Modified: | 09 Oct 2018 14:35 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/9793 |
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