A finite element analysis of the maxillary first molar PDL with maxillary protraction in a mixed dentition Class III malocclusion

Abstract Aim: To compare the two different skeletal anchorage methods with finite element analysis in the treatment of Class III patients with maxillary retrognathia. Material and Methods: Two different treatment scenarios were performed on the skull model obtained from computerized tomography images of skeletal Class III patients with maxillary retrognathia and finite element analysis was performed. In the first group; mini plates were simulated on the infra zygomatic crest. A unilateral 500 g protraction force was applied to the face-mask. In the second group; mini plates were simulated in the infrazigomatic crest and mandibular symphysis. Then, 500g protraction force was applied with Class III elastic between the miniplates. Von Misses stresses and displacement values were evaluated comparatively. Results: In the Class III elastic group, maximum Von Misses stress occurred around the infra zygomatic crest and symphysis anchored with 0.078MPa. The maxillary posterior region and paranasal regions were the areas that showed the highest Von Misses tension after infra zygomatic crest and symphysis. In the face-mask group, the most common site of Von Misses stress in the nasomaxillary complex and alveolar structures were the infra zygomatic area where plaques were applied, followed by pterygomaxillary suture. Tensile forces are reduced especially in these two areas by spreading to the surrounding structures. Conclusion: In both methods, it was determined that the amount of force transmitted to the circumaxillary sutures was sufficient to induce the formation of osteogenesis in these regions. Keywords: skeletal anchorage, Class III malocclusion, finite element analysis. Continuous...

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Biology of biomechanics: Finite element analysis of a statically determinate system to rotate the occlusal plane for correction of a skeletal Class III open-bite malocclusion

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1016/j.ajodo.2015.10.002 ◽

2015 ◽

Vol 148 (6) ◽

pp. 943-955 ◽

Cited By ~ 27

Author(s):

W. Eugene Roberts ◽

Rodrigo F. Viecilli ◽

Chris Chang ◽

Thomas R. Katona ◽

Nasser H. Paydar

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Open Bite ◽

Occlusal Plane ◽

Class Iii ◽

Element Analysis ◽

Skeletal Class ◽

Determinate System

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Three-dimensional finite element analysis of the craniomaxillary complex during maxillary protraction with bone anchorage vs conventional dental anchorage

American Journal of Orthodontics and Dentofacial Orthopedics ◽

10.1016/j.ajodo.2012.09.019 ◽

2013 ◽

Vol 143 (2) ◽

pp. 197-205 ◽

Cited By ~ 10

Author(s):

Xiulin Yan ◽

Weijun He ◽

Tao Lin ◽

Jun Liu ◽

Xiaofeng Bai ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Three Dimensional ◽

Element Analysis ◽

Maxillary Protraction ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element ◽

Bone Anchorage

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Biomechanical effects of Skeletally anchored Class III elastics on the maxillofacial complex: a 3D finite element analysis

Progress in Orthodontics ◽

10.1186/s40510-021-00375-3 ◽

2021 ◽

Vol 22 (1) ◽

Author(s):

Priyank Rai ◽

Dhiraj Garg ◽

Tulika Tripathi ◽

Anup Kanase ◽

Gayatri Ganesh

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Analytical Models ◽

Class Iii ◽

Maxillary Expansion ◽

Element Analysis ◽

3D Finite Element ◽

3D Finite Element Analysis ◽

Skeletal Class ◽

Computed Tomography Images

Abstract Background Although, the outcomes and changes in the maxillofacial complex after the application of intraoral bone anchored Class III elastics, have been reported by multiple clinical studies, there was no finite element study to assess and evaluate the stress pattern and displacement on maxillomandibular complex with bimaxillary anchorage. The present study aims to evaluate the biomechanical effects on maxillomandibular complex of Skeletally anchored Class III elastics with varying angulations using the 3D finite element analysis. Methodology Two 3-dimensional analytical models were developed using the Mimics 8.11 (Materialise: Leuven, Belgium) and ANSYS software Version 12.1 (ANSYS Inc, Canonsburg, PA, USA) from sequential computed tomography images taken from a Skeletal Class III subject. The models were meshed into 465,091 tetrahedral elements and 101,247 nodes. Intraoral mechanics for skeletally anchored maxillary protraction (I-SAMP) were applied on two models i.e. A and B (without and with maxillary expansion respectively) between miniplates on maxilla and mandible on both right and left sides with three different angulations of forces—10°, 20° and 30°). Results Although the craniomaxillary complex in both the models (A and B) displaced forward while demonstrating rotations in opposite directions, the displacements and rotations decreased gradually with the increase of the angle of load application from 10° to 30°. The mandible rotated clockwise in both the simulations, but the displacement of mandibular surface landmarks was higher in Simulation A. However, the antero-inferior displacement of the glenoid fossa was higher in Simulation B than in A. Conclusion Significant displacement of maxillofacial sutures and structures was witnessed with I-SAMP with maxillary expansion and Class III elastics for correction of Skeletal Class III with maxillary retrognathism. Thus, I-SAMP with maxillary expansion is a desired protocol for treatment of maxillary retrognathism. However, the prescribed angulation of the Class III elastics should be as low as possible to maximise the desired effects.

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