Optimization of unilateral molar rotation correction by a trans-palatal bar: a three-dimensional analysis using the finite element method

Geramy, Allahyar; Etezadi, Tahura

doi:10.1179/1465313313y.0000000050

“…Transpalatal arch design was used to optimize unilateral molar rotation correction using a finite element method by Geramy A et al 25 An activation of about 0.1 and 1.0 mm produced the same increasing patterns regarding the energy levels.…”

Section: Fem and Trans Palatal Bar And Twin Blockmentioning

confidence: 99%

Applications of Three Dimensional Finite Element Method in Orthodontics

2015

IJDA

0

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The aim of this paper is to enumerate the various applications of 3D finite element method in Orthodontics. A literature search was done in pub med, embase and cochrane. All articles related to the application of 3D finite element in orthodontics were collected. The articles were categorized into various subheadings based on their use. The various applications of 3D finite element method in orthodontics have been described in a systematic manner.

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“…A transpalatal arch (TPA) is a common orthodontic space management appliance used during the mixed or permanent dentitions [1][2][3]. It is a rigid wire passing a few millimeters over the palate and connecting to maxillary contralateral molars [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…A transpalatal arch (TPA) is a common orthodontic space management appliance used during the mixed or permanent dentitions [1][2][3]. It is a rigid wire passing a few millimeters over the palate and connecting to maxillary contralateral molars [2][3][4]. It may be used for various treatment goals such as stabilizing, anchorage, or for the movement of blocks of teeth in the horizontal, vertical, or sagittal planes; molar crossbites may be corrected, symmetric or asymmetric distalization of the maxillary molars may be facilitated, or buccal or lingual torque of their roots may be applied [1,2,[5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…It is a rigid wire passing a few millimeters over the palate and connecting to maxillary contralateral molars [2][3][4]. It may be used for various treatment goals such as stabilizing, anchorage, or for the movement of blocks of teeth in the horizontal, vertical, or sagittal planes; molar crossbites may be corrected, symmetric or asymmetric distalization of the maxillary molars may be facilitated, or buccal or lingual torque of their roots may be applied [1,2,[5][6][7][8][9][10]. While the traditional form was a transpalatal bar extending over the palate to connect the first molars [11], the Goshgarian TPA is an alternative design incorporating an extra U-loop (in a forward or backward direction) in the middle of the arch [2,4,5,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Forces exerted by TPAs have been assessed in vitro [2,3,14,15]. When activated symmetrically, the moments will be equal and in opposite directions, although the force might not be ideally symmetrical [2,14]. Alternatively asymmetrical activation would lead to moments of different magnitude, causing different extents of tooth movement [2,14].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Palatal Expansion with Torque Activation using a Transpalatal Arch: A Preliminary Single-Blind Randomized Clinical Trial

Ghorbanyjavadpour

¹

,

Rakhshan

²

2021

International Journal of Dentistry

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Purpose. The literature regarding the treatment of posterior crossbites using a transpalatal arch (TPA) is scarce. Moreover, there is only one clinical study on the correction of unilateral crossbites using torque activation. This is an important clinical issue; therefore, this study was conducted to show the effects of an active Goshgarian TPA in correcting nonfunctional single-tooth unilateral crossbite. Methods. The present single-blind, randomized clinical trial examined 60 observations on 30 individuals with nonfunctional single-tooth unilateral crossbites in the first permanent molar area. Patients were randomly divided into two groups of “symmetric expansion” [control] and “expansion + torque activation” using Goshgarian TPAs [experimental]. The palatal arch was expanded at a rate of 2 mm/month, for 2–8 months. The average treatment durations were 157.9 and 117.1 days, respectively, for the control and experimental groups. Dentoskeletal alterations were assessed on dental records, posteroanterior frontal cephalographs, and occlusal radiographs taken before and after treatment. Changes induced by treatments in each group and differences between changes in both groups were analyzed statistically (α = 0.05). Results. The treatment duration was significantly shorter in the experimental group ( P < 0.05 ). The extent of dental displacement on the crossbite side was significant no matter what treatment was applied ( P < 0.001 ); no between-group difference was detected ( P > 0.05 ). Both treatments tilted the teeth in crossbite ( P < 0.001 ) without any between-group difference ( P > 0.05 ). The noncrossbite molar was displaced in the control group, whereas this did not occur in the experimental group (between-group P < 0.001 ). Conclusions. The Goshgarian TPA can be used with torque activation in order to deliver a more effective and faster correction of nonfunctional single-tooth unilateral crossbites with more favorable clinical results.

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Orthodontic correction of a skeletal Class II malocclusion with severe gummy smile by total intrusion of the maxillary dentition

Wang¹,

Chen²,

Wang³

et al. 2022

American Journal of Orthodontics and Dentofacial Orthopedics

4

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Optimization of unilateral molar rotation correction by a trans-palatal bar: a three-dimensional analysis using the finite element method

Abstract: According to our optimized system, the TPA design with the highest energy and moment, but the lowest mesializing force associated with derotating a maxillary molar tooth was a parallel wire II design (i.e. adding a straight wire).

Cited by 7 publications

References 17 publications

Applications of Three Dimensional Finite Element Method in Orthodontics

Applications of Three Dimensional Finite Element Method in Orthodontics

Effects of Palatal Expansion with Torque Activation using a Transpalatal Arch: A Preliminary Single-Blind Randomized Clinical Trial

Orthodontic correction of a skeletal Class II malocclusion with severe gummy smile by total intrusion of the maxillary dentition

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