Recent developments in understanding temporomandibular joint disorders. Part 1: bone marrow abnormalities of the mandibular condyle

2000 ◽  
Vol 29 (1) ◽  
pp. 7-10 ◽  
Author(s):  
T Sano
Keyword(s):  
Bone Marrow ◽  
Temporomandibular Joint ◽  
Mandibular Condyle ◽  
Temporomandibular Joint Disorders ◽  
Recent Developments

scholarly journals Assessment of bone marrow fat fractions in the mandibular condyle head using the iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL-IQ) method

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246596
Author(s):  
Kug Jin Jeon ◽  
Chena Lee ◽  
Yoon Joo Choi ◽  
Sang-Sun Han
Keyword(s):  
Bone Marrow ◽  
Least Squares ◽  
Temporomandibular Joint ◽  
Mandibular Condyle ◽  
Least Squares Estimation ◽  
Control Group ◽  
Dixon Method ◽  
Iterative Decomposition ◽  
Iq Method ◽  
Decomposition Of Water

The prevalence of temporomandibular joint disorder (TMD) is gradually increasing, and magnetic resonance imaging (MRI) is becoming increasingly common as a modality used to diagnose TMD. Edema and osteonecrosis in the bone marrow of the mandibular condyle have been considered to be precursors of osteoarthritis, but these changes are not evaluated accurately and quantitatively on routine MRI. The iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL-IQ) method, as a cutting-edge MRI technique, can separate fat and water using three asymmetric echo times and the three-point Dixon method. The purpose of this study was to analyze the quantitative fat fraction (FF) in the mandibular condyle head using the IDEAL-IQ method. Seventy-nine people who underwent MRI using IDEAL-IQ were investigated and divided into 1) the control group, without TMD symptoms, and 2) the TMD group, with unilateral temporomandibular joint (TMJ) pain. In both groups, the FF of the condyle head in the TMJ was analyzed by two oral and maxillofacial radiologists. In the TMD group, 29 people underwent cone-beam computed tomography (CBCT) and the presence or absence of bony changes in the condylar head was evaluated. The FF measurements of the condyle head using IDEAL-IQ showed excellent inter-observer and intra-observer agreement. The average FF of the TMD group was significantly lower than that of the control group (p < 0.05). In the TMD group, the average FF values of joints with pain and joints with bony changes were significantly lower than those of joints without pain or bony changes, respectively (p < 0.05). The FF using IDEAL-IQ in the TMJ can be helpful for the quantitative diagnosis of TMD.

Comparison of the diagnostic accuracy of Ultrasonography and CBCT for detection of mandibular condyle erosion (an in-vitro study)

2021 ◽  
Vol 15 (5) ◽  
pp. 1661-1665
Author(s):  
Yasaman Kheirandish ◽  
Mehrdad Panjnoush ◽  
Shabnam Mohammed Charlie ◽  
Elham Romoozi
Keyword(s):  
Temporomandibular Joint ◽  
Mandibular Condyle ◽  
In Vitro Study ◽  
Temporomandibular Joint Disorders ◽  
The Body ◽  
Articular Disc ◽  
Mandibular Movement ◽  
Adequate Treatment ◽  
Bone Changes

Temporomandibular joint (TMJ) is one of the most important, unique and structurally has the highest complex synovial system in the body (1, 2). TMJ, encompassing the temporal bone, mandibular condyle and articular disc, is a diarthrodial joint. As a collective form, Temporomandibular Joint Disorders (TMD) is often with multifactorial etiologies, and these diseases can more commonly affect the soft-tissue components of the TMJ including the articular disc and posterior attachment, the osseous components of the TMJ and also the related muscles (3, 4). The most common cause of the regional orofacial pain of non-dental origin is a result of TMD. Additional symptoms may include TMJ sounds such as clicking, pumping, limited or asymmetric mandibular movement (5). As TMJ is covered by a layer of fibrocartilage, unlike other joints in the human body, the mandibular condyles can be damaged due to cartilage degeneration. In addition, arthritis can also be initiated because of the particular dynamics in the maxillofacial area (6). TMD's are frequently associated with degenerative bone changes which can involve the bone structures of the TMJ such as erosion, flattening, osteophytes, subchondral bone sclerosis and pseudocysts (7). To correctly diagnose the dysfunctions associated with the disease and for adequate treatment planning Knowledge about these bone changes is fundamental (8).

scholarly journals Dental approach in unilateral osteoarthritis of temporomandibular joint: case report

2016 ◽  
Vol 19 (2) ◽  
pp. 132
Author(s):  
Carlos Wallace Cunha ◽  
Carolina Rodrigues ◽  
Lais Valencise Magri ◽  
Bruno Henrique Figueiredo Matos ◽  
Cesar Bataglion ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Temporomandibular Joint ◽  
Sudden Change ◽  
Mandibular Condyle ◽  
Mouth Opening ◽  
Point Of View ◽  
Temporomandibular Joint Disorders ◽  
Nervous Stimulation ◽  
The Right

<p><strong>Objective</strong>: To describe a case of unilateral TMJ osteoarthritis from the Dentistry point of view, aiming to restore the quality of life through non-invasive procedures. <strong>Description of case</strong>: M.C.B., female, 69 years, complaining about a sudden change in the bite, difficulty to chewing/opening mouth and pain in the orofacial region. At extraoral examination, we observe the presence of crepitus in the left TMJ, click in the right TMJ (electrovibratography) and pain on palpation in the left TMJ region. Absence of tooth contacts on the right side in maximum habitual intercuspation (MHI). The intraoral examination revealed the presence of inflammation and excessive wear in the left mandibular condyle (osteoarthritis), visualized by computed tomography and magnetic resonance imaging with contrast. The patient underwent treatment by oclusal splint (night use), overlay removable partial dentures (daytime use), application of lower level laser therapy and transcutaneous electrical nervous stimulation (TENS). Masticatory function, mouth opening, and aesthetics improved. <strong>Conclusion</strong>: Conservative therapies may be a good option for the re-establishment of the quality of life in subjects with TMJ osteoarthritis, inasmuch as it can postpone or delete the indication of more invasive techniques (e.g. surgery).</p><p> </p><p><strong>Keywords</strong></p><p>Osteoarthritis; Temporomandibular joint disorders; Temporomandibular joint. </p><p> </p>

Synthetic magnetic resonance imaging for quantitative parameter evaluation of temporomandibular joint disorders

2021 ◽  
pp. 20200584
Author(s):  
Chena Lee ◽  
Yoon Joo Choi ◽  
Kug Jin Jeon ◽  
Sang-Sun Han
Keyword(s):  
Magnetic Resonance Imaging ◽  
Bone Marrow ◽  
Magnetic Resonance ◽  
Temporomandibular Joint ◽  
Temporomandibular Joint Disorders ◽  
Proton Density ◽  
Disc Displacement ◽  
Resonance Imaging ◽  
Synthetic Mri ◽  
Osseous Change

Objective: This study investigated the usefulness of quantitative parameters [longitudinal relaxation (T1), transverse relaxation (T2), and proton density (PD)] obtained with synthetic magnetic resonance imaging (MRI) in assessing the progression of temporomandibular joint (TMJ) disorders. Methods: For individual TMJ disorder diagnoses, the presence of disc displacement in MRI and the osseous change in cone-beam CT were investigated. Joints were classified into three stages: (1) silent stage, no disc displacement or osseous change; (2) incipient stage, presence of disc displacement and absence of osseous change; and (3) progressed stage, both disc displacement and osseous change. In synthetic MRI, the T1, T2, and PD values of the condyle bone marrow were measured simultaneously. The median T1, T2, and PD values were analyzed according to disc displacement, osseous changes, and joint stage. Results: Significant differences were observed in the T1 and PD values of joints with disc displacement or condylar osseous change compared to normal joints. The T1 and PD values also differed between the silent and progressed stages. The PD value differed between the silent and incipient groups, while the T2 value did not differ significantly among the three groups. Conclusion: The PD and T1 values of condylar bone marrow obtained from synthetic MRI can be used as sensitive indicators of TMJ disorder progression. The PD value of the bone marrow showed potential as a useful biomarker for recognizing the initial stages of TMJ disorders. Synthetic MRI is useful for the simultaneous acquisition of effective MRI parameters for evaluating TMJ disorders.

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