disc displacement
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Author(s):  
Nasser Alqhtani ◽  
Ahmad Ali Alshadwi ◽  
Adel Al-Zahrani ◽  
Rana Saud Alshagroud, ◽  
Ali Al Rafedah ◽  
...  

Background: Determination of the role of the Lateral Pterygoid Muscle LPM in the articular disc displacement ADD is controversial referring to the variations in the pattern of insertion of the Superior Lateral Pterygoid Muscle SPLM. Introduction: it was well understood that the superior head of the lateral pterygoid muscle has only a single insertion pattern among individuals in which the muscle is attached to the articular disc and capsule. However, recent findings in many studies have shown a noticeable variation in the insertion pattern of the upper LPM. Method: MRI examinations were collected at King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia. Scans of 61 patients (41 females, 20 males, mean age 33 years old) with symptoms of temporomandibular dysfunction were reviewed retrospectively. The direction of their articular disc displacement was evaluated through sagittal and coronal views in both open and closed mouth positions. Results: There was no statistical significance found between the LPM attachment types and TMJ disc position. The chi-square test also showed no significant difference between the type of LPM attachment and the condylar location. Forty-five percent of the articular discs were located between the articular eminence and the glenoid fossa. The majority of the disc displacement was in the anterior direction. Conclusion: There was no statistically significant association between the type of LPM attachments and the direction of disc displacement.


2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Hui Na Cheng ◽  
Lee Mui Lee ◽  
Yong Qiang Deng ◽  
Dan Di Zhang ◽  
Wei Yao ◽  
...  

Author(s):  
Ying-Hui Wang ◽  
Ruo-Han Ma ◽  
Jia-Jun Li ◽  
Chuang-Chuang Mu ◽  
Yan-Ping Zhao ◽  
...  

Objectives: To evaluate the diagnostic efficacy of CBCT–MRI fused image for anterior disc displacement and bone changes of temporomandibular joint (TMJ), which are the main imaging manifestations of temporomandibular disorders (TMD). Methods: Two hundred and thirty-one TMJs of 120 patients who were diagnosed with TMD were selected for the study. The anterior disc displacement, bone defect and bone hyperplasia evaluated by three experts were used as a reference standard. Three residents individually evaluated all the three sets of images, which were CBCT images, MRI images and CBCT-MRI fused images from individual CBCT and MRI images in a random order for the above-mentioned three imaging manifestations with a five-point scale. Each set of images was observed at least 1 week apart. A second evaluation was performed 4 weeks later. Intra- and interobserver agreements were assessed using the intraclass correlation coefficient (ICC). The areas under the ROC curves (AUCs) of the three image sets were compared with a Z test, and p < 0.05 was considered statistically significant. Results: One hundred and forty-five cases were determined as anterior disc displacement, 84 cases as bone defect and 40 cases as bone hyperplasia. The intra- and interobserver agreements in the CBCT-MRI fused image set (0.76–0.91) were good to excellent, and the diagnostic accuracy for bone changes was significantly higher than that of MRI image set (p<0.05). Conclusions CBCT-MRI fused images can display the disc and surrounding bone structures simultaneously and significantly improve the observers’ reliability and diagnostic accuracy, especially for inexperienced residents.


2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Irene García Martín ◽  
Paolo Cariati ◽  
Angel Martínez-Sauquillo Rico ◽  
Blas García Medina

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Hassan Mohamed Mohamed Youssef ◽  
Remon Zaher Elia ◽  
Khaled Ahmed Mohamed Ali

Abstract Background The temporomandibular joint disorders (TMD) have been a major source of pathology. Being only second to chronic low back pain as a cause of pain and disability. MRI is currently considered the gold standard method for imaging of the TMJ. USG is a non-invasive, inexpensive procedure. And can provide a potential sensitive tool for diagnosis of anterior disc displacement. Aim of the work The aim of this study is to compare between the accuracy of ultrasound and MRI in diagnosis of TMJ disc displacement. Patients and Methods This study was carried out at the Radiology Department, Ain Shams University Hospitals. Twenty one patients with clinically suspected TMJ disc displacement underwent ultrasound (US) and MRI examination. Results The overall sensitivity of the US to diagnose disc displacement compared to MRI reached (94.7%), specificity (91.3%), Positive Predictive value (90.0%), Negative Predictive Value (95%) and accuracy (92.9%). The results indicated 1.8 mm was the most accurate cut-off distance between the articular capsule and the anterior surface of the mandibular condyle for diagnosis of MR positive disc displacement.


Cells ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 2423
Author(s):  
Bartosz Dalewski ◽  
Katarzyna Białkowska ◽  
Łukasz Pałka ◽  
Anna Jakubowska ◽  
Paweł Kiczmer ◽  
...  

Numerous reports describe the association between the single-nucleotide polymorphism (SNP) rs12722 and rs13946 in the COL5A1 gene and injuries, such as Achilles tendon pathology, anterior cruciate ligament (ACL) injuries, and tennis elbow. Hence, there were no studies investigating COL5A1 and temporomandibular joint (TMJ) pathology. The aim of this study is to evaluate the relationship between COL5A1 rs12722 and rs13946 SNPs and TMJ articular disc displacement without reduction (ADDwoR). In this case-control study, the study group consisted of 124 Caucasian patients of both sexes. Each patient had a history of ADDwoR no more than 3 months prior. The control group comprised 126 patients with no signs of TMD according to DC/TMD. Genotyping of the selected SNPs was performed by real-time PCR using TaqMan probes. The significance of the differences in the distribution of genotypes was analyzed using Pearson’s chi-square test. Logistic regression modeling was performed to analyze the influence of the 164 investigated SNPs on ADDwoR. The COL5A1 marker rs12722 turned out to be statistically significant (p-value = 0.0119), implying that there is a difference in the frequencies of TMJ ADDwoR. The distribution of rs12722 SNPs in the study group TT(66), CC(27), CT(31) vs. control group TT(45), CC(26), CT(51) indicates that patients with CT had an almost 2.4 times higher likelihood of ADDwoR (OR = 2.41) than those with reference TT (OR = 1), while rs13946 genotypes were shown to be insignificant, with a p-value of 0.1713. The COL5A1 rs12722 polymorphism is a risk factor for ADDwoR in the Polish Caucasian population.


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