Comparison of the effects of different types of maxillary protraction on the maxilla with finite element analysis

2021 ◽  
pp. 1-18
Author(s):  
Muhammed Hilmi Buyukcavus ◽  
Burak Kale
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Face Mask ◽  
Skeletal Anchorage ◽  
Class Iii ◽  
Element Analysis ◽  
Skeletal Class ◽  
Skull Model ◽  
Tensile Forces ◽  
The Face

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...

scholarly journals Evaluation of the Effects of the Dental and Skeletal Anchored Face Mask Therapies on the Craniofacial System by Using Nonlinear Finite Element Analysis

2017 ◽  
Vol 7 ◽  
pp. 267-272
Author(s):  
Beril Demir Karamanli ◽  
Hülya Kılıçoğlu ◽  
Armağan Fatih Karamanli
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Face Mask ◽  
Nonlinear Finite Element ◽  
Occlusal Plane ◽  
Skeletal Anchorage ◽  
Fe Model ◽  
Class Iii ◽  
Forward Movement ◽  
Element Analysis

Aims The aim of this study was to evaluate the biomechanical effects on the craniofacial complex of skeletal anchorage and dental anchorage during face mask therapy. Subjects and Methods Two nonlinear finite element (FE) simulations were performed using a three-dimensional FE model. Face mask therapy with dental anchorage in the upper canines and face mask therapy with skeletal anchorage in the piriform apertures of the maxilla were simulated. In both simulations, the magnitude of the applied force was 750 g per side, and the force direction was 30° forward and downward relative to the occlusal plane. Results The circummaxillary sutures showed greater and more uniform stresses in the skeletal anchorage model than the dental anchorage model. This is the result of the more parallel forward movement of the maxilla in the skeletal anchorage model. Conclusions In Class III malocclusions with maxillary deficiency, for improved effects on the maxilla, choosing skeletal anchorage may be more effective in face mask therapies

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

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.

3D Finite Element Analysis on ChaHanWuSu CFRD Built on Thick Alluvium Deposits

2011 ◽  
Vol 243-249 ◽  
pp. 4482-4487 ◽  
Author(s):  
Da Wei Sun ◽  
Kang Ping Wang ◽  
Hui Qin Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computer Calculation ◽  
Element Analysis ◽  
Produce Water ◽  
3D Finite Element ◽  
3D Mesh ◽  
3D Finite Element Analysis ◽  
The Face ◽  
Cushion Layer

As a very popular dam style, more concrete- faced rockfill dams have been built in the world, but there is presently only a few high CFRDs with dam height more than 100m built on thick alluvium deposits. ChaHaWuSu CFRD with dam height 107.60m and the maximum thickness of alluvium deposits 46.70m, has been built in Xinjiang province, China recently. The excessive of displacement of foundation and dam body may lead to big deformation of peripheral joint and cause the failure of seal materials and produce water leakage. Therefore, 3D finite element analysis was carried out to estimate the deformation of dam. Firstly, 3D mesh including surrounding mountain and alluvium deposits was established by use of advanced grid discreteness technique. Secondly, Desai thin layer elements were adopted to model the interface between the face slab and cushion layer. Moreover, joint elements were adopted to model the joints between the face slab and plinth, plinth and connecting slab, connecting slab and connecting slab, connecting slab and diaphragm wall. Finally, large scales of equations solving method were adopted in the procedure thus the computer calculation time was greatly reduced. The calculation result was compared with the monitored deformation date of ChaHaWuSu CFRD. All in all, the above research will do much benefit to the CFRD design on thick alluvium deposits.

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