scholarly journals 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

2015 ◽  
Vol 148 (6) ◽  
pp. 943-955 ◽  
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

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 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.

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 Nonsurgical treatment of a hyperdivergent skeletal Class III patient with mini-screw–assisted mandibular dentition distalization and flattening of the occlusal plane

2021 ◽  
Author(s):  
Yiruo He ◽  
Yangyang Wang ◽  
Xinghai Wang ◽  
Jiangyue Wang ◽  
Ding Bai ◽  
...  
Keyword(s):  
Treatment Plan ◽  
Open Bite ◽  
Nonsurgical Treatment ◽  
Occlusal Plane ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Anterior Open Bite ◽  
Skeletal Class ◽  
Posterior Crossbite ◽  
Mandibular Plane

ABSTRACT Treatment of hyperdivergent skeletal Class III malocclusion is challenging for orthodontists, and orthognathic-orthodontic treatment is usually required. This report presents the successful nonsurgical treatment of a 20-year-old man who had a skeletal Class III malocclusion with anterior open bite, anterior and posterior crossbite, hyperdivergent growth pattern, steep occlusal plane, early loss of three first molars, and an uncommon convex profile with a retruded chin. An orthodontic camouflage treatment plan was chosen based on the etiology and the patient's complaints. Tooth #37 was extracted. Miniscrews were used for uprighting and intruding of the lower molars, distalization of the lower dentition, and flattening of the occlusal plane. After 34 months of active treatment, Class I relationships, proper anterior overjet and overbite, flat occlusal plane, and an esthetic facial profile were achieved. The results demonstrated that the biomechanics involved in the nonsurgical treatment assisted with miniscrews to distalize the mandibular dentition and flatten the occlusal plane while keeping the mandibular plane stable was effective for treating this hyperdivergent skeletal Class III patient with a convex profile and anterior open bite.

scholarly journals Multiloop Edgewise Arch-wire Technique for Skeletal Class III Openbite: A Case Report

2018 ◽  
Vol 7 (2) ◽  
pp. 56-59
Author(s):  
Dharma Laxmi Basukala
Keyword(s):  
Case Report ◽  
Morphological Characteristics ◽  
Open Bite ◽  
Occlusal Plane ◽  
Fourth Quadrant ◽  
Third Molars ◽  
Class Iii ◽  
High Angle ◽  
Class Iii Malocclusion ◽  
Skeletal Class

Skeletal Class III with openbite is one of the most difficult malocclusion to treat orthodontically. Generally, the morphological characteristics of this malocclusion are poor antero-posterior growth of the maxilla or excessive growth of the mandible with high angle. An 18-year-old male had Class III malocclusion with retrognathic maxilla and normal mandible with high angle. All third molars except on fourth quadrant were extracted to eliminate the posterior crowding. Multiloop Edgewise Arch-wire (MEAW) technique was used to upright the mesially inclined buccal teeth and to correct occlusal plane. In nine month time,  anterior cross bite and open bite were corrected; normal overjet, overbite and Class I canine relation were achieved.

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