scholarly journals Finite Elements Analysis of the Temporomandibular Joint Disc in Patients with Intra-articular Disorders

2020 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stress Distribution ◽  
Temporomandibular Joint ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc ◽  
Fea Model ◽  
Tmj Disc ◽  
Joint Disorder ◽  
3D Fea

Abstract Background： Anterior and/or medial displacement of the temporomandibular joint disorder(TMJ) disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction(TMD).TMD cause change of friction coefficient during TMJ movement. In the present study, We provided a 3D finite elements models(FEM) including the maxilla, disc and mandible and evaluated the stress distribution with different friction coefficient. Methods: 14 volunteers without TMD and 20 TMD patients,who were diagnosed by MRI, were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured. Result: In the normal model, stress distribution on TMJ disc was 2.07±0.17,1.49±0.14,1.41±0.14MPa with 0.001 0.3 and 0.4 friction coefficient.In TMD model,stress distribution is 3.87±0.15,7.23±0.22,7.77±0.19MPa respectively. Conclusion: When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.

scholarly journals Finite Elements Analysis of the Temporomandibular Joint Disc in Patients with Intra-articular Disorders

2020 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stress Distribution ◽  
Temporomandibular Joint ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc ◽  
Fea Model ◽  
Tmj Disc ◽  
Joint Disorder ◽  
3D Fea

Abstract Background：Anterior and/or medial displacement of the temporomandibular joint disorder(TMJ) disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction(TMD).TMD cause change of friction coefficient during TMJ movement. In the present study, We provided a 3D finite elements models(FEM) including the maxilla, disc and mandible and evaluated the stress distribution with different friction coefficient.Methods: 14 volunteers without TMD and 20 TMD patients,who were diagnosed by MRI, were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured.Result: In the normal model, stress distribution on TMJ disc was 2.07±0.17,1.49±0.14,1.41±0.14MPa with 0.001 0.3 and 0.4 friction coefficient.In TMD model,stress distribution is 3.87±0.15,7.23±0.22,7.77±0.19MPa respectively. Conclusion:When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.

Finite Elements Analysis of the Temporomandibular Joint Disc in Patient with Intra-articular Disorders

2019 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Friction Coefficient ◽  
Finite Elements ◽  
Stress Distribution ◽  
Articular Disc ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc ◽  
Data Registration ◽  
Fea Model ◽  
3D Data ◽  
3D Fea

Abstract Abstract Background：Anterior and/or medial displacement of the articular disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction.In the present study,3D finite elements analysis (FEA) models including the maxilla, disc and mandible were established using 3D data registration technology.Methods：Six healthy volunteers and 20 TMD patients were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc.Stress distribution with different friction coefficient was measured.Result:Results showed that maximum stress of the lateral articular disc in the normal and pathological models. In the normal model, stress distribution was 2.21,1.56,1.49 MPa with 0.001 0.3 and 0.4 friction coefficient.In ID model,stress distribution is 3.87,7.23,7.77MPa respectively. Conclusion:When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.

scholarly journals Finite elements analysis of the temporomandibular joint disc in patients with intra-articular disorders

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Linfeng Lai ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia ◽  
Guofeng Xiong
Keyword(s):  
Finite Elements ◽  
Temporomandibular Joint ◽  
Finite Elements Analysis ◽  
Temporomandibular Joint Disc

A Comparison of the Mechanical Properties of the Goat Temporomandibular Joint Disc to the Mandibular Condylar Cartilage in Unconfined Compression

2011 ◽  
Author(s):  
Catherine K. Hagandora ◽  
Alejandro J. Almarza
Keyword(s):  
Temporomandibular Joint ◽  
Unconfined Compression ◽  
Compressive Behavior ◽  
Articular Eminence ◽  
Condylar Cartilage ◽  
Temporomandibular Joint Disc ◽  
Mandibular Condylar Cartilage ◽  
Structural Abnormalities ◽  
Tmj Disc

The temporomandibular joint (TMJ) is a synovial, bilateral joint formed by the articulation of the condyle of the mandible and the articular eminence and glenoid fossa of the temporal bone. The articulating tissues of the joint include the TMJ disc and the mandibular condylar cartilage (MCC). It is estimated that 10 million Americans are affected by TMJ disorders (TMDs), a term encompassing a variety of conditions which result in positional or structural abnormalities in the joint. [1] Characterization of the properties of the articulating tissues of the joint is a necessary prequel to understanding the process of pathogenesis as well as tissue engineering suitable constructs for replacement of damaged joint fibrocartilage. Furthermore, the current literature lacks a one-to-one comparison of the regional compressive behavior of the goat MCC to the TMJ disc.

scholarly journals Tissue engineering toward temporomandibular joint disc regeneration

2018 ◽  
Vol 10 (446) ◽  
pp. eaaq1802 ◽  
Author(s):  
Natalia Vapniarsky ◽  
Le W. Huwe ◽  
Boaz Arzi ◽  
Meghan K. Houghton ◽  
Mark E. Wong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tissue Engineering ◽  
Temporomandibular Joint ◽  
Treated Group ◽  
Defect Closure ◽  
Repair Tissue ◽  
Temporomandibular Joint Disc ◽  
Disc Regeneration ◽  
Tmj Disc ◽  
Engineering Strategy

Treatments for temporomandibular joint (TMJ) disc thinning and perforation, conditions prevalent in TMJ pathologies, are palliative but not reparative. To address this, scaffold-free tissue-engineered implants were created using allogeneic, passaged costal chondrocytes. A combination of compressive and bioactive stimulation regimens produced implants with mechanical properties akin to those of the native disc. Efficacy in repairing disc thinning was examined in minipigs. Compared to empty controls, treatment with tissue-engineered implants restored disc integrity by inducing 4.4 times more complete defect closure, formed 3.4-fold stiffer repair tissue, and promoted 3.2-fold stiffer intralaminar fusion. The osteoarthritis score (indicative of degenerative changes) of the untreated group was 3.0-fold of the implant-treated group. This tissue engineering strategy paves the way for developing tissue-engineered implants as clinical treatments for TMJ disc thinning.

Is Temporomandibular Joint Disc Displacement without Reduction a Plausible Cause of Condylar Hypoplasia? A Case Report

2019 ◽  
Vol 1 (1) ◽  
pp. 68-73 ◽  
Author(s):  
Yi-Shu Liu ◽  
Adrian U-Jin Yap ◽  
Jie Lei ◽  
Kai-Yuan Fu
Keyword(s):  
Temporomandibular Joint ◽  
Clinical Presentation ◽  
Mouth Opening ◽  
Disc Displacement ◽  
Normal Morphology ◽  
Temporomandibular Joint Disc ◽  
Tmj Disc ◽  
Heat Therapy ◽  
Initial Support ◽  
Tmj Pain

Background: The causes of mandibular condylar hypoplasia can be congenital or acquired in nature. Cited local causes of acquired hypoplasia include trauma, infection and irradiation. We report a case of hypoplastic condyle that was attributed to temporomandibular joint (TMJ) disc displacement without reduction (DDwoR). Clinical Presentation: A 16-year-old male presented with restricted mouth opening and right TMJ pain for 6 months. He was subsequently diagnosed with DDwoR. Conservative treatment comprising self-care and moist-heat therapy was administered and he was followed for 27 months without any further interventions. During this period, transitions from “normal” morphology to condylar flattening / erosion, and eventually a re-modeled smaller “normal” right TMJ were observed. Conclusion: The present case provided initial support that DDwoR could be a plausible cause of condylar hypoplasia in adolescents / young adults.

scholarly journals 3-D digital modeling and bio-mechanics research of the anterior disk displacement without reduction temporomandibular joint system

2019 ◽  
Author(s):  
Linfeng Lai ◽  
Guofeng Xiong ◽  
Chenyao Huang ◽  
Fan Zhou ◽  
Fujian Xia
Keyword(s):  
Maximum Stress ◽  
Lateral Part ◽  
Articular Disc ◽  
Finite Elements Analysis ◽  
Joint System ◽  
Data Registration ◽  
Fea Model ◽  
3D Data ◽  
Digital Modeling ◽  
3D Fea

Abstract Background： Anterior and/or medial displacement of the articular disc or intra-articular disorders( ID) is the most common form of TMJ dysfunction.In the present study,3D finite elements analysis (FEA) models including the maxilla, disc and mandible were established using 3D data registration technology. Materials and Methods： Six healthy volunteers and 20 TMD patients were selected.CT and MRI data were collected to build 3D FEA model of mandibular and TMJ disc. Result: Results showed that maximum stress of the normal lateral articular disc in the normal and pathological models appeared in the lateral part of the middle band. In the normal model, stress distribution was more uniform and the joint disc and the condyle were also subjected to higher load at the junction of the articular disc and the condyle. Conclusion: When the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were cd32fvhigher than those of the normal lateral joint.

scholarly journals Experimentally Created Nonbalanced Occlusion Effects on the Thickness of the Temporomandibular Joint Disc in Rats

2009 ◽  
Vol 79 (1) ◽  
pp. 51-53 ◽  
Author(s):  
Lei Sun ◽  
Meiqing Wang ◽  
Jianjun He ◽  
Lei Liu ◽  
Shuang Chen ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Plastic Material ◽  
Univariate Analysis ◽  
Intermediate Zone ◽  
Control Group ◽  
Sprague Dawley ◽  
Temporomandibular Joint Disc ◽  
Tmj Disc ◽  
Α Level ◽  
Experimental Group

Abstract Objectives: To test the hypothesis that experimentally created physiologically nonbalanced occlusion will not affect the thickness of the temporomandibular joint (TMJ) discs in rats. Material and Methods: Twenty-four 8-week-old Sprague-Dawley rats were equally divided into a control group that was left untreated and an experimental group where a nonbalanced occlusion was created. Elastic rubber bands, 1 mm in diameter, were inserted and 1 week later were replaced by plastic material between the first and the second molars of the left maxillary and the right mandibular dentitions to move the first molars about 0.8 mm mesially. This created and maintained a physiologically nonbalanced occlusion. The animals were euthanized 8 weeks later, and the TMJ disc thickness was measured on histologically prepared slices using an electronic meter. Two-way univariate analysis of variance was used to compare the groups (α level = .05). Results: The intermediate zone was thicker in the experimental group than in the control group (P = .003), but no differences were found between groups regarding the anterior and posterior bands. There were no significant sex-related effects on this observation. Conclusion: The hypothesis is rejected. The results indicate that the intermediate zone of rat TMJ disc has the ability to adapt to the alteration of the space between condyle and fossa caused by occlusion changes. Further studies on larger groups that are followed for longer times are needed.

scholarly journals The Regional Contribution of Glycosaminoglycans to Temporomandibular Joint Disc Compressive Properties

2012 ◽  
Vol 134 (1) ◽  
Author(s):  
Vincent P. Willard ◽  
Kerem N. Kalpakci ◽  
Andrew J. Reimer ◽  
Kyriacos A. Athanasiou
Keyword(s):  
Extracellular Matrix ◽  
Temporomandibular Joint ◽  
Time Course ◽  
Large Population ◽  
Biomechanical Properties ◽  
Intermediate Zone ◽  
Compressive Properties ◽  
Temporomandibular Joint Disc ◽  
Extracellular Matrix Molecule ◽  
Tmj Disc

Understanding structure-function relationships in the temporomandibular joint (TMJ) disc is a critical first step toward creating functional tissue replacements for the large population of patients suffering from TMJ disc disorders. While many of these relationships have been identified for the collagenous fraction of the disc, this same understanding is lacking for the next most abundant extracellular matrix component, sulfated glycosaminoglycans (GAGs). Though GAGs are known to play a major role in maintaining compressive integrity in GAG-rich tissues such as articular cartilage, their role in fibrocartilaginous tissues in which GAGs are much less abundant is not clearly defined. Therefore, this study investigates the contribution of GAGs to the regional viscoelastic compressive properties of the temporomandibular joint (TMJ) disc. Chondroitinase ABC (C-ABC) was used to deplete GAGs in five different disc regions, and the time course for >95% GAG removal was defined. The compressive properties of GAG depleted regional specimens were then compared to non-treated controls using an unconfined compression stress-relaxation test. Additionally, treated and non-treated specimens were assayed biochemically and histologically to confirm GAG removal. Compared to untreated controls, the only regions affected by GAG removal in terms of biomechanical properties were in the intermediate zone, the most GAG-rich portion of the disc. Without GAGs, all intermediate zone regions showed decreased tissue viscosity, and the intermediate zone lateral region also showed a 12.5% decrease in modulus of relaxation. However, in the anterior and posterior band regions, no change in compressive properties was observed following GAG depletion, though these regions showed the highest compressive properties overall. Although GAGs are not the major extracellular matrix molecule of the TMJ disc, they are responsible for some of the viscoelastic compressive properties of the tissue. Furthermore, the mechanical role of sulfated GAGs in the disc varies regionally in the tissue, and GAG abundance does not always correlate with higher compressive properties. Overall, this study found that sulfated GAGs are important to TMJ disc mechanics in the intermediate zone, an important finding for establishing design characteristics for future tissue engineering efforts.

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