scholarly journals Simplified stress analysis on the temporomandibular joint in Class III patients with and without mandibular asymmetry using a rigid body spring model

2009 ◽  
Vol 12 (4) ◽  
pp. 312-318 ◽  
Author(s):  
K Ueki ◽  
N Takeuchi ◽  
K Nakagawa ◽  
E Yamamoto
Keyword(s):  
Rigid Body ◽  
Stress Analysis ◽  
Temporomandibular Joint ◽  
Spring Model ◽  
Class Iii ◽  
Mandibular Asymmetry

scholarly journals The relationship between temporomandibular joint disk displacement and mandibular asymmetry in skeletal Class III patients

2011 ◽  
Vol 81 (4) ◽  
pp. 624-631 ◽  
Author(s):  
Hyung-Joo Choi ◽  
Tae-Woo Kim ◽  
Sug-Joon Ahn ◽  
Shin-Jae Lee ◽  
Richard E. Donatelli
Keyword(s):  
Temporomandibular Joint ◽  
Class Iii ◽  
Skeletal Class ◽  
Disk Displacement ◽  
Mandibular Asymmetry ◽  
The Relationship

scholarly journals Disk Position and Temporomandibular Joint Structure Associated with Mandibular Setback in Mandibular Asymmetry Patients

2009 ◽  
Vol 79 (3) ◽  
pp. 521-527 ◽  
Author(s):  
Masayoshi Kawakami ◽  
Kazuhiko Yamamoto ◽  
Tomohiro Inoue ◽  
Atsuhisa Kajihara ◽  
Masaki Fujimoto ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Contralateral Side ◽  
Magnetic Resonance Images ◽  
University Hospital ◽  
Class Iii ◽  
Sagittal Split Ramus Osteotomy ◽  
Skeletal Class ◽  
Mandibular Setback ◽  
Mandibular Asymmetry ◽  
Articular Disk

Abstract Objective: To determine the changes in articular disk position and the temporomandibular joint (TMJ) structure in patients who had an asymmetric setback of the mandible performed by a bilateral sagittal split ramus osteotomy with manual positioning of the condyle. Materials and Methods: Twenty-two patients with skeletal Class III malocclusion being treated at Nara Medical University Hospital were evaluated using clinical examination and pre- and postoperative magnetic resonance images of their TMJs. Results: Changes in articular disk position after asymmetric setback surgery were not statistically significant, although a tendency of anterior displacement in the fossa was noted. The anterior and posterior joint spaces did not show significant changes, whereas the condyle head of the deviated or contralateral side tended to be positioned downward. Conclusion: The asymmetric setback of the mandible with intraoperative manual positioning of the condyle does not significantly change the disk position in the fossa.

Theoretical Stress Analysis in Wrist Joint – Neutral Position and Functional Position

2000 ◽  
Vol 25 (3) ◽  
pp. 292-295 ◽  
Author(s):  
E. GENDA ◽  
E. HORII
Keyword(s):  
Rigid Body ◽  
Stress Analysis ◽  
Wrist Joint ◽  
Three Dimensional ◽  
Force Distribution ◽  
Neutral Position ◽  
Spring Model ◽  
Triangular Fibrocartilage ◽  
Theoretical Stress ◽  
Functional Position

A three-dimensional rigid body spring model (3D-RBSM) was used to analyse force distribution through the wrist joint. In the neutral position, 48% of the force was transmitted through the radioscaphoid fossa, 40% through the radiolunate fossa, and 12% through the triangular fibrocartilage complex. In the functional position, the wrist joint was slightly extended, resulting in significantly increased force through the lunate (53%). The lunate appears to bear more load than has been reported previously.

scholarly journals The Short-Term Effect of Active Skeletonized Sutural Distractor Appliance on Temporomandibular Joint Morphology of Class III Malocclusion Subjects

2021 ◽  
Author(s):  
Mohamed Zahoor Ul Huqh ◽  
Rozita Hassan ◽  
Roselinda Abdul Rahman ◽  
Asilah Yusof ◽  
Ida Bagus Narmada ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Term Effect ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Short Term ◽  
Short Term Effect ◽  
Condylar Position ◽  
Joint Morphology ◽  
The Right ◽  
Condylar Volume

Abstract Objectives The purpose of this study was to evaluate the short-term effect of active skeletonized sutural distractor (ASSD) appliance on temporomandibular joint morphology of class III malocclusion subjects. Materials and Methods This was a prospective interventional study. Cone-beam computerized tomography (CBCT) images of 22 patients were taken before and after treatment by using Planmeca Promax 3D CBCT machine version 2.9.2 (Planmeca OY Helsinki, Finland). The condylar width, height, length, roof of glenoid fossa thickness, and all joint spaces were measured. The condylar position was determined based on Pullinger and Hollander formula. The condylar shape was determined as per Kinzinger et al. The condylar volume was calculated by using Mimics software (Materialize, Belgium). Statistical Analysis Data analysis was performed by using SPSS software version 24. Wilcoxon paired signed-rank test was used to compare the difference in temporomandibular joint morphology and condylar volume between pre- and post-treatment measurements. Chi-square test was used to compare the condylar position and shape. Results The superior (p = 0.000 on the right side, p = 0.005 on the left side) and posterior joint spaces (p = 0.000 on both sides) were decreased after the treatment, respectively. The condyles were rotated upward and backward, thereby increasing the anterior joint spaces (p = 0.000 on both sides) after the treatment. The condylar volume increases after treatment, but no significant differences were observed (p = 0.903 on the right side, p = 0.062 on the left side). Conclusion The significant changes were observed in joint spaces. The condyles were more anteriorly placed before treatment. Condylar position and shape alter in response to ASSD treatment. The condylar volume did not show any significant change.

Stress analysis in human temporomandibular joint affected by anterior disc displacement during prolonged clenching

2013 ◽  
Vol 40 (4) ◽  
pp. 239-246 ◽  
Author(s):  
S. Abe ◽  
F. Kawano ◽  
K. Kohge ◽  
T. Kawaoka ◽  
K. Ueda ◽  
...  
Keyword(s):  
Stress Analysis ◽  
Temporomandibular Joint ◽  
Disc Displacement ◽  
Anterior Disc Displacement

scholarly journals Mandibular Asymmetry in Different Occlusion Patterns

2007 ◽  
Vol 77 (5) ◽  
pp. 803-807 ◽  
Author(s):  
Omer Said Sezgin ◽  
Peruze Celenk ◽  
Selim Arici
Keyword(s):  
Class Ii ◽  
Asymmetry Index ◽  
Control Group ◽  
Class Iii ◽  
Mandibular Asymmetry ◽  
Normal Occlusion ◽  
Division 1 ◽  
Index Value ◽  
Age Range ◽  
Division 2

Abstract Objective: To investigate the effects of different occlusion types on the mandibular asymmetry in young individuals. Materials and Methods: Mandibular asymmetry measurements were performed on the panoramic radiographs of 189 subjects (104 females and 85 males; age range, 11–15 years), with different occlusion patterns. The subjects were divided into five groups according to the occlusion types, namely, Angle Class I (Cl I), Class II division 1 (Cl II/1), Class II division 2 (Cl II/2), Class III (Cl III), and normal occlusions. The Kruskal-Wallis test was used to determine the possible statistically significant differences between the groups for condyle, ramus, and condyle-plus-ramus asymmetry index measurements. Identified differences between groups were further analyzed using the Mann-Whitney U-test at the 95% confidence interval (P < .05). Results: There were no statistically significant differences between male and female subjects. The Kruskal-Wallis test showed that the occlusion type had a significant effect on the condylar asymmetry. In Cl II/1 cases, condylar asymmetry values were significantly different from the values of Cl II/2 and Cl III malocclusion and normal occlusion types. The normal occlusion control group was significantly different from those of Cl II/1 and the Cl I malocclusion groups. Conclusion: Cl II/1 malocclusion has a significant effect on the condylar asymmetry index when compared to Cl II/2 and Cl III malocclusion and normal occlusion types. However, the mean condylar asymmetry index value in Cl II/1 malocclusion was not different from Cl I malocclusion.

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