Change of lateral pterygoid muscle and temporomandibular disc position after bi-maxillary surgery in class II and III patients

2020 ◽  
Author(s):  
Koichiro Ueki ◽  
Akinori Moroi ◽  
Akihiro Takayama ◽  
Kunio Yoshizawa
Keyword(s):  
Class Ii ◽  
Lateral Pterygoid Muscle ◽  
Disc Position ◽  
Maxillary Surgery

scholarly journals Assessment of anterior positioning splint in conjunction with lateral pterygoid BTX injection to treat TMJ disc displacement with reduction — a preliminary report

2021 ◽  
Vol 43 (1) ◽  
Author(s):  
Maram Taema ◽  
Nouran Abdel Nabi ◽  
Samira Ibrahim ◽  
Heba Ahmed Kamal ◽  
Aala’a Emara
Keyword(s):  
Preliminary Report ◽  
Disc Displacement ◽  
Lateral Pterygoid Muscle ◽  
Postoperative Mri ◽  
Pain Scores ◽  
Group I ◽  
Disc Position ◽  
Group Ii ◽  
The Cost ◽  
Disc Displacement With Reduction

Abstract Objective Treatment of temporomandibular disc displacement with reduction is controversial. This study assesses the use of an anterior positioning splint with botulinum toxin in the lateral pterygoid muscle (BTX) for such cases. Methods Twelve joints were included; groups I and II received BTX injection while group II also received an anterior positioning splint. Pain scores and clicking status were recorded at regular intervals then a postoperative MRI was done after 4 months. Results Clinical improvement was noted in both groups. Mean pain scores dropped significantly and clicks in the twelve joints disappeared in 83% of group I and 33% of group II. MRIs showed significant disc position improvement with the higher mean change (1.33 ± 0.76) in group I. Group I showed better improvement of discal position and only one joint regained a click. Patients of group II reported discomfort from the splint which may have caused psychological distress and so worst pain scores. Conclusions Group I  showed slightly better results but the cost of BTX injections and the complications of the splint should be kept in mind and the decision of treatment selection made according to each condition.

The Role of the Lateral Pterygoid Muscle in Articular Disc Displacement: A Cross-Sectional Magnetic Resonance Imaging Study

2022 ◽  
Vol 18 ◽  
Author(s):  
Nasser Alqhtani ◽  
Ahmad Ali Alshadwi ◽  
Adel Al-Zahrani ◽  
Rana Saud Alshagroud, ◽  
Ali Al Rafedah ◽  
...  
Keyword(s):  
Statistical Significance ◽  
Imaging Study ◽  
Research Centre ◽  
Disc Displacement ◽  
Articular Disc ◽  
Lateral Pterygoid Muscle ◽  
Cross Sectional ◽  
Disc Position ◽  
Significant Difference

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.

scholarly journals Three-dimensional comparative evaluation of articular disc position and other temporomandibular joint morphology in Class II horizontal and vertical cases with Class I malocclusion:

2020 ◽  
Vol 90 (5) ◽  
pp. 707-714
Author(s):  
Zynul Ali Sirsmith John ◽  
Sunita S. Shrivastav ◽  
Ranjit Kamble ◽  
Eshita Jaiswal ◽  
Rajasbala Dhande
Keyword(s):  
Temporomandibular Joint ◽  
Orthodontic Treatment ◽  
Sagittal Plane ◽  
Three Dimensional ◽  
Class Ii ◽  
Class I ◽  
Articular Disk ◽  
Disc Position ◽  
Condylar Position ◽  
Mri Evaluation

ABSTRACT Objective To evaluate and compare articular disk position, condylar position, and joint spaces in Class II vertical, Class II horizontal, and Class I cases. The purpose was to assess the potential for development of temporomandibular disorders (TMDs) in the three groups. Materials and Methods A sample of 75 cases, 25 cases in each group of Class I, Class II vertical, and Class II horizontal, were selected based on inclusion and exclusion criteria. Magnetic resonance imaging (MRI) assessments were made with a 1.5-Tesla basic system with a closed-mouth technique for evaluating articular disk position in the sagittal and transverse planes, condylar position, and joint spaces in the sagittal plane. Philips 3.0 software was used to analyze the MR images. Results There was evidence of alterations in the temporomandibular joint (TMJ) morphology in both Class II vertical and Class II horizontal cases, with maximum discrepancy in Class II vertical cases. MRI evaluation suggested a tendency for antero-medial disk displacement with anteriorly positioned condyles in Class II vertical cases. The discrepancy was milder in the Class II horizontal group. Conclusions Class II vertical cases are more susceptible to the development of TMDs and should be subjected to TMJ evaluation before starting any orthodontic treatment to intercept and prevent a mild asymptomatic TMD from developing into a more severe form. Class II vertical cases should be subjected to MRI evaluation before starting any orthodontic treatment.

Electron microscopy analysis of degenerating pancreatic ß cells in transgenic mice expressing the MHC Class I antigen Dd

1990 ◽  
Vol 48 (3) ◽  
pp. 548-549
Author(s):  
T. A. Stewart ◽  
D. Liggitt ◽  
S. Pitts ◽  
L. Martin ◽  
M. Siegel ◽  
...  
Keyword(s):  
Type I Diabetes ◽  
Disease Process ◽  
Class Ii ◽  
Class I ◽  
Type I ◽  
Aberrant Expression ◽  
Mhc Molecules ◽  
Endogenous Insulin ◽  
Class Ii Mhc ◽  
Ifn Γ

Insulin-dependant (Type I) diabetes mellitus (IDDM) is a metabolic disorder resulting from the lack of endogenous insulin secretion. The disease is thought to result from the autoimmune mediated destruction of the insulin producing ß cells within the islets of Langerhans. The disease process is probably triggered by environmental agents, e.g. virus or chemical toxins on a background of genetic susceptibility associated with particular alleles within the major histocompatiblity complex (MHC). The relation between IDDM and the MHC locus has been reinforced by the demonstration of both class I and class II MHC proteins on the surface of ß cells from newly diagnosed patients as well as mounting evidence that IDDM has an autoimmune pathogenesis. In 1984, a series of observations were used to advance a hypothesis, in which it was suggested that aberrant expression of class II MHC molecules, perhaps induced by gamma-interferon (IFN γ) could present self antigens and initiate an autoimmune disease. We have tested some aspects of this model and demonstrated that expression of IFN γ by pancreatic ß cells can initiate an inflammatory destruction of both the islets and pancreas and does lead to IDDM.

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