• Journal of Oral Medicine and Pain
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• v.44 no.2
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• pp.45-53
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• 2019

Purpose: To determine whether crepitus may be a clinical indication for early temporomandibular joint (TMJ) osteoarthritis (OA) and to investigate the correlation between crepitus and the occurrence of TMJ OA with respect to factors, such as patient sex, age, chewing habits, and diagnosis. Methods: This is retrospective analysis of clinical data for 162 TMJs. The criteria for a joint to be included in this study was a minimum of two cone-beam computed tomography (CBCT) scans performed with no OA observed during the initial scan. The Diagnostic Criteria for Temporomandibular Disorders was used for OA diagnosis. Crepitus was recorded when it was objectively palpated during the follow-up period. Correlations between various patient factors and progression to TMJ OA were calculated using the Pearson's chi-square test. A linear-by-linear association was used to analyze trends of OA progression with increasing age. Results: Among the 162 joints, 101 progressed to OA and 61 did not. In the joints where crepitus had been present before OA was confirmed at next or last CBCT, OA progressed at a high rate, and especially higher in female and older patients (p<0.01). Patients in the pain-related disorder group with crepitus were observed to have higher rates of OA progression compared to patients in the intra-articular disorder group (p<0.01). Conclusions: If a patient experiences pain in the TMJs and crepitus, close monitoring through regular CBCT scans is necessary even if there is no evidence of radiologically confirmed OA after the first CBCT.

• Journal of Dental Rehabilitation and Applied Science
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• v.25 no.3
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• pp.237-242
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• 2009

the primary diagnosis of synovial chondromatosis of temporomandibular joint is extremely rare. often many months, or even years pass before the diagnosis is confirmed. synovial chondromatosis is an uncommon disease of cartilage transformation of synovial membrane with formation of loose bodies within the joint space. a 28-year-old women had experienced pain of the left TMJ area at mastication. Radiographs of the left TMJ revealed calcified loose bodies in superior temporomandibular joint space. treatment consisted of removal of calcified loose bodies and synovail membrane. after surgery, pain of Lt temporomandibular area at mastication disappeared. until present after surgery there have been no recuurence of symptoms.

• Journal of Yeungnam Medical Science
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• v.12 no.1
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• pp.141-148
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• 1995

The Magnetic resonance imaging has been used widely to evaluate the disk position without any interruption of the TMJ structures, and the dynamic MRI presenting computed serial imaging or the video-recorded simulation images is thought to be very effective to evaluate the disk position under function. This is to study the correlation between the clinical diagnosis and the findings of dynamic MRI for diagnosis of internal derangement of the 7 patients were examined clinically, and the movement of TMJ meniscus was reviewed in the dynamic MRI. MRI was very reliable to diagnose the amount of anterior displacement of articular disc, the structural abnormality of temporomandibular joint, the cause of functional limitation, and to differentiate the muscle related pain & dysfunction.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.50 no.11
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• pp.541-549
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• 2001

The term 'silent period(SP)' refers to a transitory, relative or absolute decrease electromyography(EMG) activity, evoked in the midst of an otherwise sustained contraction. Masseteric SP is elicited by a tap on the chin during isometric contraction of masseter muscle. In this paper, a new EMG signal generation model including SP in masseter muscle is proposed. This work is based on the anatomical structure of trigeminal nerve system that related on temporomandibular joint(TMJ) dysfunction. And it was verified by comparing the real EMG signals including SP in masseter muscle to the simulated signals by the proposed model. Through this studies, it was shown that SP has relation to variable neurophysiological phenomena. A proposed model is based on the control system theory and DSP(Digital Signal Processing) theory, and was simulated using MATLAB simulink. As a result, the proposed SP model generated EMG signals which are similar to real EMG signal including normal SP and an abnormal extended SP. This model can be applied to the diagnosis of TMJ dysfunction and can effectively explain the origin of extended SP.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.23 no.2
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• pp.335-344
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• 1993

The purpose of this study was to clarify the spatial relationship of temporomandibular joint and to an aid in the diagnosis of temporomandibular disorder. For this study, three-dimensional images of normal temporomandibular joints were reconstructed by computer image analysis system and three-dimensional reconstructive program integrated in computed tomography. The obtained results were as follows: 1. Two-dimensional computed tomograms had the better resolution than three dimensional computed tomograms in the evaluation of bone structure and the disk of TMJ. 2. Direct sagittal computed tomograms and coronal computed tomograms had the better resolution in the evaluation of the disk of TMJ. 3. The positional relationship of the disk could be visualized, but the configuration of the disk could not be clearly visualized on three-dimensional reconstructive CT images. 4. Three-dimensional reconstructive CT images had the smoother margin than three-dimensional images reconstructed by computer image analysis system, but the images of the latter had the better perspective. 5. Three-dimensional reconstructive images had the better spatial relationship of the TMJ articulation, and the joint spaces were more clearly visualized on dissection images.

• Journal of Oral Medicine and Pain
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• v.46 no.3
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• pp.69-74
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• 2021

As for temporomandibular joint arthritis (TMJ OA), managing the contributing factors at an early stage through accurate diagnosis is necessary to prevent irreversible bone changes. TMJ OA, which is a multi-organ disease caused by various pathophysiological mechanisms, is developed mainly due to mechanical overload. It is a disease characterized by degeneration of articular cartilage and subchondral bone as a low-level inflammatory arthritis condition developed by dysregulation of catabolic and anabolic activity of chondrocytes. Age, mechanical overload sensing of cartilage, chondrocyte apoptosis, catabolic enzymes, inflammatory factors, abnormal remodeling of subchondral bone, and estrogens may be involved in the pathogenesis of arthritis. Therefore, a comprehensive evaluation is needed to diagnose and manage progressive cartilage degeneration, subchondral bone remodeling, and associated symptoms of TMJ OA.

• Journal of Oral Medicine and Pain
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• v.48 no.1
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• pp.25-30
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• 2023

We present the case of a 60-year-old male with post-macrotrauma disc displacement and retrodiscitis, in which temporomandibular joint (TMJ) injection and manual therapy were used to alleviate his symptoms. He visited our clinic with complaints of pain and swelling in his right facial area and malocclusion of his right side teeth after being hit on the right side of his face five days earlier. During clinical and radiological examinations, the inflammatory state of the joint and disc displacement on the right side, which led to malocclusion, were noted. At the initial visit, we performed TMJ intracapsular injection and prescribed medications to control pain and inflammation. Simultaneously, manual manipulation was performed to relocate the disc. The same treatments were employed two days later. However, 10 days after the first visit, his symptoms did not mitigate substantially. We also performed magnetic resonance imaging (MRI), prescribed nortriptyline, and created a stabilization splint. MRI images depicted inflammatory disc displacement and joint effusion in the right TMJ. Based on the accurate diagnosis, we kept administering a stabilization splint, intra-articular injection, and medication. His signs and symptoms were alleviated 20 days after the initial visit and did not reoccur for the next 40 days.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.42 no.4
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• pp.227-230
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• 2016

Septic arthritis of the temporomandibular joint (TMJ) is a rare disease. The most common symptoms of this disease are acute malocclusion, limited mouth opening, swelling, and tenderness of affected TMJ. These symptoms are often confused with internal derangement of the articular disc, rheumatoid arthritis, retrodiscitis, or osteoarthritis. Therefore, differential diagnosis by image examination is required. Usually, antimicrobial treatment and surgical drainage by needle aspiration, arthroscopy, or arthrotomy are effective treatment approaches. In this study, a patient who was diagnosed with septic arthritis was treated with arthrocentesis and antibiotics without significant complications. We present a case report with a review of the literature.

• The Journal of the Korean dental association
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• v.54 no.6
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• pp.438-446
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• 2016

Severe tooth wear may cause the pathologic change of the TMJ and masticatory muscles, unesthetic facial appearance, pathogenic pulp and occlusal disharmony. Treating patients with severely worn dentition often requires full mouth rehabilitation with increasing vertical dimension. Proper diagnosis and treatment planning are important for esthetic and functional definitive restorations and the long term stability of the neuromuscular system and the TMJ. In this case, 66 year-old female presented with generalized worn dentition. Based on assessment, pathologic destruction of teeth structure on entire dentition was caused by masticatory force and diet habit without loss of vertical dimension. Subsequently, 3 mm increase of vertical dimension that based on incisor for tooth restoration and esthetic improvement was determined. After 8 weeks stabilization period with temporary fixed prostheses, definitive prostheses were fabricated. After 6 months follow up period, satisfactory outcomes were attained both functional and esthetic aspects through this procedure.

• Journal of Oral Medicine and Pain
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• v.44 no.1
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• pp.35-39
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• 2019

Calcifying aponeurotic fibroma (CAF) is an uncommon benign soft-tissue fibroblastic tumor with characteristic histological features. It mainly occurs in the distal part of the extremities, such as the hands and feet, in children and adolescents. Males are twice as commonly affected as females. CAF exhibits local invasiveness, and hence, its recurrence rate is also high. Therefore, complete surgical excision is both diagnostic and therapeutic. The occurrence of CAF in the maxillofacial region, especially the temporomandibular joint (TMJ), is very rare, and this necessitates its differentiation from other TMJ neoplasms. The differential diagnosis of CAF requires microscopic examination. Herein, we report a rare case of CAF located at the left mandibular condyle, which was confirmed by histopathological analysis.