Influence of examiner calibration on clinical and MRI diagnosis of temporomandibular joint disc displacement: a systematic review and meta-analysis.

OBJECTIVES: This study aimed to verify the accuracy of clinical protocols for the diagnosis of disc displacement (DD) compared with MRI, considering examiners' calibration. METHODS: PubMed, Cochrane (Central), Scopus, Web of Science, LILACS, Embase, Science Direct, Google Scholar, and DANS EASY Archive databases were searched. Two reviewers independently screened and selected the studies. A meta-analysis was conducted using the R Statistical software. Results are shown using sensitivity and specificity, and 95% confidence intervals. RESULTS: Of the 20 studies included in the systematic review, only three were classified as low risk of bias. Seventeen studies were included in the meta-analysis. Compared to MRI, clinical protocols showed overall sensitivity and specificity of 0.75 (0.63-0.83) and 0.73 (0.59-0.84) for DD diagnosis, respectively. For DD with reduction, sensitivity was 0.64 (0.48-0.77) and specificity was 0.72 (0.48-0.87). For DD without reduction, sensitivity was 0.58 (0.39-0.74) and specificity 0.93 (0.83-0.97). Only 8 studies reported examiner calibration when performing clinical and/or MRI evaluation; nevertheless, calibration showed a tendency to improve the diagnosis of DD. CONCLUSION: The sensitivity and specificity of clinical protocols in the diagnosis of DD are slightly below the recommended values, as well as the studies lack calibration of clinical and MRI examiners. Examiner calibration seems to improve the diagnosis of DD.

Counselling treatment versus counselling associated with jaw exercises in patients with disc displacement with reduction-a single-blinded, randomized, controlled clinical trial.

OBJECTIVE: To compare effectiveness of counselling program versus counselling program plus jaw exercises to reduce pain and click in patients with temporomandibular joint disc displacement with reduction (DDWR). MATERIALS AND METHODS: Patients were divided into two groups: instructions for temporomandibular disorders (TMD) plus jaw exercises (test, n = 34), only TMD instructions (control, n = 34). Pain was analyzed by palpation (RDC/TMD). It was investigated if the click caused discomfort. Both groups were evaluated at baseline, 24 h, 7 days, and 30 days' post treatment. RESULTS: The click was present in 85.7% (n = 60). In 30-day evaluation, there was a statistically significant difference between groups in the right median temporal muscle (p = 0.041); and there was a statistically significant difference in treatment self-perception (p = 0.002) and click's discomfort (p < 0.001). CONCLUSION: The exercise with recommendations showed better results, resolution of the click, and self-perception of the treatment effectiveness. CLINICAL RELEVANCE: This study presents therapeutic approaches that are easy to perform and that can be monitored remotely. In view of the current stage of the global pandemic, these treatment options become even more valid and useful. CLINICAL TRIAL REGISTER: This clinical trial was registered at Brazilian Clinical Trials Registry (ReBec) under protocol RBR-7t6ycp ( http://www.ensaiosclinicos.gov.br/rg/RBR-7t6ycp/ ), Date of registration: 26/06/2020.

MRI changes and clinical characteristics in temporomandibular joints with displacement of the articular disk without reduction - a cross-sectional observational study.

OBJECTIVES: This study examined changes in magnetic resonance imaging (MRI) of temporomandibular joints (TMJ) with anterior displacement disk without reduction (DDwoR) and its correlation to clinical symptoms. METHODS: 190 individuals with DDwoR were evaluated according to Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) and MRI. Pain's chronicity/intensity and limited mouth opening (locking) were correlated with: TMJ degeneration (MRI T1), effusion (T2), disc's shape and position (proton density). RESULTS: In 103 TMJ with DDwoR, hemiconvex shape (41.6%), sclerosis (45.6%) and mild effusion (47.6%) were the most prevalent findings. There was not association (p > .05) between: different DDwoR positions with pain's intensity/chronicity; effusion with locking. Disk deformation was associated with degeneration (p = .034) and pain's intensity (p = .006). Locking was associated with degeneration (p = .05). CONCLUSIONS: Condylar osteodegeneration is often related to DDwoR. Locking by DDwoR is associated with severe levels of chronic pain and articular disk deformation.

Magnetic resonance imaging texture analysis of the temporomandibular joint for changes in the articular disc in individuals with migraine headache / Análise de textura por ressonância magnética da articulação temporomanbibular com alterações no disco articular em individuos com cefaleia migranea

Objective: the aim of this study was to analyse the performance of the technique of texture analysis (TA) with magnetic resonance imaging (MRI) scans of temporomandibular joints (TMJs) as a tool for identification of possible changes in individuals with migraine headache (MH) by relating the findings to the presence of internal derangements. Material and Methods: thirty MRI scans of the TMJ were selected for study, of which 15 were from individuals without MH or any other type of headache (control group) and 15 from those diagnosed with migraine. T2-weighted MRI scans of the articular joints taken in closed-mouth position were used for TA. The co-occurrence matrix was used to calculate the texture parameters. Fisher's exact test was used to compare the groups for gender, disc function and disc position, whereas Mann-Whitney's test was used for other parameters. The relationship of TA with disc position and function was assessed by using logistic regression adjusted for side and group. Results: the results indicated that the MRI texture analysis of articular discs in individuals with migraine headache has the potential to determine the behaviour of disc derangements, in which high values of contrast, low values of entropy and their correlation can correspond to displacements and tendency for non-reduction of the disc in these individuals. Conclusion: the TA of articular discs in individuals with MH has the potential to determine the behaviour of disc derangements based on high values of contrast and low values of entropy (AU)

Objetivo: o objetivo deste estudo foi analisar o desempenho da técnica de análise de textura (AT) em exames de ressonância magnética (RM) das articulações temporomandibulares (ATM) como ferramenta para identificação de possíveis alterações em indivíduos com cefaléia migrânea (CM) relacionando os achados com a presença de desarranjos internos. Material e Métodos: trinta exames de RM das ATM foram selecionados para estudo, sendo 15 de indivíduos sem cefaleia migrânea ou qualquer outro tipo de cefaléia (grupo controle) e 15 diagnosticados com CM. As imagens de RM ponderadas em T2 das articulações realizadas na posição de boca fechada foram usadas para AT. A matriz de co-ocorrência foi usada para calcular os parâmetros de textura. O teste exato de Fisher foi usado para comparar os grupos quanto ao sexo, função do disco e posição do disco, enquanto o teste de Mann-Whitney foi usado para os demais parâmetros. A relação da AT com a posição e função do disco foi avaliada por meio de regressão logística ajustada para lado e grupo. Resultados: a AT por RM dos discos articulares em indivíduos com cefaleia migrânea tem o potencial de determinar o comportamento dos desarranjos discais, em que altos valores de contraste, baixos valores de entropia e sua correlação podem corresponder a deslocamentos e tendência a não redução do disco nesses indivíduos. Conclusão: a análise de textura dos discos articulares em indivíduos com CM tem potencial para determinar o comportamento dos desarranjos do disco com base em altos valores de contraste e baixos valores de entropia. (AU)

Discopexia e fisioterapia no tratamento do deslocamento de disco articular sem redução / Discopexy and physiotherapy in the treatment of articular disc displacement withou reduction

A articulação temporomandibular está vunerável a várias condições de anormalidades já bastante conhecidas, dentre elas, o deslocamento do disco articular sem redução, considerado pela literatura o mais comum das patologias desta região. A deterioração do quadro pode ser um indicativo da necessidade cirúrgica. Em específico, no deslocamento de disco sem redução, o reposicionamento definitivo pode ser adquirido através de discopexia e artrocentese. O presente trabalho tem como objetivo relatar um caso clínico de deslocamento de disco articular bilateral sem redução, apresentando a importância da fisioterapia associada à abordagem cirúrgia na recuperação da função mandibular, bem como, reforçar a importância de uma abordagem conjunta entre análise clínica e imaginológica para resolução de casos. Paciente feminino cursando com diversos sintomas em face e pescoço de forma progressiva ao longo de dois anos foi submetida a cirurgia na articulação temporo-mandibular, onde foi feita a discopexia através de ancoragem dos discos articulares com parafusos. A avaliação física, assim como, a imaginológica, ajudaram na confirmação do diagnóstico. A abordagem cirurgica adotada no tratamento deste caso foi descrita na literatura desde o final do século XIX. Conclui-se que, o método utilizado no tratamento do deslocamento de disco sem redução deve ser baseado nos sinais e sintomas do paciente, cuja abordagem deve ser readequada de acordo com as mudanças do quadro apresentado. Nesta análise, a abordagem cirúrgica associada à fisioterapia específica para as estruturas musculoesquelética da face trouxeram resultados positivos(AU)

The temporomandibular joint is responsible for several well-known conditions of abnormalities, among them, the joint disc displacement without reduction, considered by the literature the most common pathology of this region. Deterioration of the condition may be indicative of surgical need. Specifically, in displacement disc without reduction, definitive repositioning can be achieved through discopexy and arthrocentesis. The aim of the present study is to report a case of unilateral articular disc displacement without reduction, as well the importance of physiotherapy associated with the surgical approach in the recovery of mandibular function, as well as reinforcing the importance of a joint approach between clinical and imaging analysis for case resolution. Female patient with several symptoms in the face and neck progressively over two years, underwent surgery in the temporomandibular joint, where discopexy was performed by anchoring the articular discs with screws. The physical assessment, as well as the imaging, helped to confirm the diagnosis. The surgical approach adopted in the treatment of this case has been described in the literature since the end of the 19th century. In conclusion, the method used to treat articular disc displacement without reduction should be based on the patient's signs and symptoms, whose approach should be readjusted according to the changes in the presented picture. In this analysis, the surgical approach associated with specific physiotherapy for the musculoskeletal structures of the face brought positive results(AU)

Who is the individual that will complain about temporomandibular joint clicking?

BACKGROUND: Understanding the profile of the individual complaining of TMJ clicking can help in the clinical approach of these patients. OBJECTIVE: To identify clinical variables associated with individuals who complain about and seek treatment for TMJ clicking. METHODS: Seventy-two individuals, composed the sample: Group 1 - patients with a complaint of TMJ clicking who sought treatment; (n = 36); Group 2 - individuals with TMJ clicking who have no complaints about it (n = 36). Three categories of data were evaluated: clinical (gender; age; side of TMJ clicking; TMJ pain; self-reported level of bother; previous TMJ clicking information); somatosensory (mechanical pain threshold [MPT], wind-up ratio [WUR], pressure pain threshold [PPT]); and, psychosocial (Pain Vigilance and Awareness Questionnaire [PVAQ]; Pain Catastrophising Scale [PCS]; Tampa Scale for Kinesiophobia for Temporomandibular Disorders [TSK/TMD]); The Perceived Stress Scale (PSS); The State-Trait Anxiety Inventory (STAI). RESULTS: Group 1 was composed mostly of female patients, with TMJ pain, without previous orientation about the condition, bothered by the clicking, with lower PPT and higher scores in the PVAQ, PCS, TKS/TMD, PSS and STAI scales than Group 2. The groups did not differ significantly for side of TMJ clicking, age, MPT and WUR. CONCLUSION: Individuals who have a TMJ clicking complaint and seek treatment are mostly female, have TMJ pain, have not received previous orientation about TMJ clicking, are bothered by the clicking, have a lower pain threshold and higher scores of hypervigilance, catastrophising, kinesiophobia, stress and anxiety than people with TMJ clicking who do not report it.

Correlation between condylar size on CT and position of the articular disc on MRI of the temporomandibular joint.

Objective: To analyze the relationship between the size of the mandibular condyle and the temporomandibular joint disc position using computed tomography and magnetic resonance imaging.Methods: One hundred joints were retrospectively analyzed. The measures analyzed included the condylar head height, the medio-lateral and antero-posterior dimensions of the condylar head, and the TMJ disc position. ANOVA correlation coefficient and Tukey's post hoc test were employed.Results: The mean age of the subjects was 20.3 years. There were no significant correlations between the disc position in closed-mouth and the condylar head sizes. There was no significant correlation between the position of the disc in open mouth and the height of the condylar head, but there were statistically significant associations between the position of the disc and the horizontal condylar dimensions, the medial-lateral (p < .014), and the anterior-posterior sizes (p < .020).Conclusion: The condylar head size was smaller in subjects with disc displacement without reduction.

Efeitos da fotobiomodulação na atividade de nociceptores e na expressão de citocinas pró-inflamatórias após lesão do disco da articulação temporomandibular em ratos / Effects of Photobiomodulation on nociceptive activity and in the expression of inflammatory citokynes after injury of the Temporomandibular Joint disc after in rats

A dor na articulação temporomandibular (ATM) é comum na clínica, na forma de artralgia. Geralmente, é devido a distúrbios do disco articular, deslocamentos ou trauma. Nosso objetivo foi analisar os efeitos da fotobiomodulação (PBM) na atividade nociceptora e na expressão de substâncias pró-inflamatórias no disco da ATM após lesão unilateral em ratos. Foi realizada lesão no disco após acesso cirúrgico na ATM sob anestesia geral. 40 ratos foram divididos em 4 grupos (n = 10 cada): Grupo Op + PBM: Lesão cirúrgica do disco articular e PBM; Grupo SHAM: Falso operado +PBM; Grupo Op: lesão cirúrgica do disco articular; Grupo Naive: controle. Dez sessões foram realizadas com laser GaAs com comprimento de onda de 904 nm e densidade de energia 6J / cm2. Uma parte das amostras contendo tecidos moles articulares foram preparadas para determinação do conteúdo protéico por espectrofotometria da substância P (SP), receptor do potencial transiente vaniloide do subtipo-1 (TRPV-1) e peptídeo relacionado ao gene da calcitonina (CGRP), Interleucina 6 (IL-6), Interleucina 1 beta (IL1-) e Fator de Necrose Tumoral alfa (TNF-). Foi realizada análise de variância de duas vias com pós-teste de Tukey (p <0,050). Outra parte foi utilizada para análise histológica e histomorfometrica. Houve aumento da expressão das substâncias avaliadas após lesão e uma diminuição significante após PBM, quando comparado com os demais grupos. A análise histológica e histomorfométrica mostrou reparação com melhor organização tecidual no grupo Op + PBM O uso da PBM é eficaz na modulação da atividade nociceptora e nas expressões das citocinas pró-inflamatórias na ATM.

Pain in the temporomandibular joint (TMJ) is common in the clinic, in the form of arthralgia. It is usually due to joint disc disorders, dislocations, or trauma. Our objective was to analyze the effects of photobiomodulation (PBM) on nociceptor activity and on the expression of pro-inflammatory substances in the TMJ disc after unilateral injury in rats. Disc injury was performed after surgical access to the TMJ under general anesthesia. 40 rats were divided into 4 groups (n = 10 each): Group Op + PBM: Surgical lesion of the articular disc and PBM; SHAM group: False operated +PBM; Group Op: surgical lesion of the articular disk; Naive group: control. Ten sessions were performed with a GaAs laser with a wavelength of 904 nm and an energy density of 6J/cm2. A portion of the samples containing joint soft tissues were prepared for determination of protein content by spectrophotometry of substance P (SP), receptor transient vanilloid potential subtype-1 (TRPV-1) and calcitonin gene-related peptide (CGRP), Interleukin 6 (IL-6), Interleukin 1 beta (IL1-) and Tumor Necrosis Factor alpha (TNF-). Two-way analysis of variance with Tukey's post-test (p<0.050) was performed. Another part was used for histological and histomorphometric analysis. There was an increase in the expression of the evaluated substances after injury and a significant decrease after PBM, when compared to the other groups. Histological and histomorphometric analysis showed repair with better tissue organization in the Op + PBM group the use of PBM is effective in modulating nociceptor activity and expressions of pro-inflammatory cytokines in the TMJ.

Oral health-related quality of life in patients with disc displacement with reduction after counselling treatment versus counselling associated with jaw exercises.

OBJECTIVE: The aim of this study was to compare the effectiveness of two types of treatment (counselling programme versus counselling programme plus jaw exercises) to improve the quality of life of patients with disc displacement with reduction (DDWR). MATERIALS AND METHODS: Patients were divided into two groups. The test group received guidelines for temporomandibular disorders (TMD) plus jaw exercises for DDWR, and the control group received only guidelines for TMD. The total number of investigated patients was 70, thus 35 per group. The oral health-related quality of life was assessed by the OHIP-14 questionnaire. Both groups were evaluated at the baseline and 30 days post-treatment. RESULTS: In the counselling group, there was statistically significant decrease in pain (P = .015) and social disability (P = .046) subscales. In the counselling plus jaw exercise group, there was statistically significant decrease in all subscales (P < .05). At 30 days follow-up, there was a statically significant difference between the two groups in pain (P = .004), psychological discomfort (P < .001), psychological disability (P < .001) and social disability (P = .029) subscales. CONCLUSION: The counselling programme plus jaw exercise protocol showed greater improvement in oral health-related quality of life than the group performing only the counselling programme in patients with DDWR.

Clinical variables associated with the presence of articular pain in patients with temporomandibular joint clicking.

OBJECTIVE: To study and estimate the impact of clinical, somatosensory, and psychosocial variables associated with the concomitant presence of temporomandibular joint (TMJ) pain in patients with TMJ clicking. MATERIALS AND METHODS: Ninety-three individuals composed the sample: patients with painful TMJ clicking (n = 47) and patients with painless TMJ clicking (n = 46). Four categories of data were evaluated: clinical features (gender, maximal interincisal distance (MID), side of complaint, age); bruxism (sleep bruxism (SB), awake bruxism (AB)); somatosensory (mechanical pain threshold (MPT), wind-up ratio (WUR), pressure pain threshold (PPT), conditioned pain modulation (CPM)); and psychosocial (Pittsburgh Sleep Quality Index (PSQI), pain vigilance and awareness questionnaire (PVAQ), Pain Catastrophizing Scale (PCS), Tampa Scale for Kinesiophobia for Temporomandibular Disorders (TSK/TMD), Oral Behaviors (OBs)). RESULTS: Female gender, AB, WUR, CPM, PSQI, PCS, and OBs significantly (p < 0.05) increased the chance of the concomitant presence of TMJ pain in patients with TMJ clicking. On the other hand, MID, MPT, and PPT significantly (p < 0.05) decreased this chance. The other variables had no association. CONCLUSION: It can be concluded that being a woman, having AB, hyperalgesia in WUR, less efficient CPM, poor sleep quality, pain catastrophizing, and harmful OBs significantly increased the chance of the concomitant presence of TMJ pain in patients with TMJ clicking. In the opposite, high figures of MID, MPT, and PPT decreased the chance. CLINICAL RELEVANCE: Most patients with TMJ clicking usually postpone seeking treatment until the clicking truly disturbs or there is a concomitant presence of TMJ pain. Understanding the variables associated with this concomitance can be important in clinical practice.

Oral behaviors, bruxism, malocclusion and painful temporomandibular joint clicking: is there an association?

Abstract The present cross-sectional case-control study aimed to determine if there is an association between specific oral behaviors, sleep bruxism (SB), awake bruxism (AB), and painful temporomandibular joint (TMJ) clicking. Ninety individuals were dived into three groups; Group 1 (n = 30): painful TMJ clicking; Group 2 (n = 30): painless TMJ clicking; and Group 3 (n = 30): control group. The following clinical data were studied: oral behaviors (unilateral chewing, gum chewing, nail biting, foreign objects biting, leaning with jaw against the hand, and sleeping in a position that pressures the jaw), SB, AB (including the frequency in 10 days, evaluated by ecological momentary assessment), and malocclusions investigated based on clinical inspections (anterior open bite, posterior cross-bite, abnormal overbite/overjet, occlusal guidance, mediotrusive and/or laterotrusive interferences, retruded contact position to maximum intercuspation slide, missing posterior teeth). All statistical tests (Kolmogorov-Smirnov, chi-square, and one-way ANOVA) were performed with a 5% significance level. Group 1 had the highest frequency of and a significant association with leaning with jaw in the hand, sleeping position that pressures the jaw, gum chewing, nail biting, and AB (p<0.05). Gum chewing, nail biting, and AB were associated with Group 2 only when compared to Group 3 (p<0.05). No significant difference among groups was found for other behaviors (unilateral chewing and foreign objects biting), SB, and all malocclusions (p>0.05). It can be concluded that patients with painful TMJ clicking had a higher frequency of and a significant association with some specific harmful behaviors and AB.

Effect of mesenchymal stem cells on the regeneration of structures associated with temporomandibular joint: narrative review / Efeito de células-tronco mesenquimais na regeneração das estruturas associadas à articulação temporomandibular: revisão narrativa

ABSTRACT BACKGROUND AND OBJECTIVES: Temporomandibular disorders are the problems involving the masticatory muscles and/or the temporomandibular joint and, among them, the bone and joint disc degenerative processes stand out. However, an effective treatment for these cases has not yet been identified in the literature. Thus, the primary objective of this study was to evaluate the reparative potential of mesenchymal stem cells on degenerative changes in structures associated with the temporomandibular joint in humans and animal models. CONTENTS: This narrative review included intervention trials in humans and animals that presented as an outcome variable the repair of joint discs and/or temporomandibular joint. The following databases were used: Pubmed, LILACS, Scielo and Google Scholar. Titles and abstracts were analyzed for the pre-selection of articles potentially eligible for inclusion in this review. The information collected from each article was included in a specific spreadsheet for this purpose containing the year of publication, article title, author's name, study location, type of study, methodology, results, and conclusions. Two human studies and four animal studies were selected to compose the narrative review. In all studies presented, the presence of stem cells was able to improve the clinical, histological, and morphological parameters of the temporomandibular joint. CONCLUSION: The use of stem cells seems to be effective in treating degenerative changes in temporomandibular joint associated structures in both animal and human models. However, due to the small number of studies and their heterogeneity, the results presented should be evaluated sparingly.

RESUMO JUSTIFICATIVA E OBJETIVOS: As desordens temporomandibulares constituem-se em um termo coletivo de problemas que envolvem os músculos mastigatórios e/ou a articulação temporomandibular. Dentre esses, destacam-se os processos degenerativos ósseos e do disco articular, contudo, ainda não foi identificado na literatura um tratamento eficaz para esses casos. Dessa forma, o objetivo desse estudo foi avaliar o potencial reparador das células-tronco mesenquimais sobre as alterações degenerativas das estruturas associadas à articulação temporomandibular em humanos e em modelos animais. CONTEÚDO: Foram incluídos ensaios de intervenção em humanos e em animais que apresentassem como variável desfecho o reparo dos discos articulares e/ou da articulação temporomandibular. Foram realizadas buscas nas seguintes bases de dados: Pubmed, LILACS, Scielo e Google Acadêmico. Os títulos e resumos foram analisados para a pré-seleção dos artigos potencialmente elegíveis para sua inclusão. As informações coletadas de cada artigo foram incluídas em planilha específica para essa finalidade contendo o ano de publicação, título do artigo, nome do autor, local do estudo, tipo de estudo, metodologia, resultado e conclusões. Foram selecionados 2 estudos em humanos e 4 estudos em animais para compor este estudo. Em todas essas pesquisas apresentadas, a presença de células-tronco foi capaz de melhorar parâmetros clínicos, histológicos e morfológicos da articulação temporomandibular. CONCLUSÃO: O uso de células-tronco parece ser eficaz no tratamento das alterações degenerativas das estruturas associadas à articulação temporomandibular. Todavia, devido ao reduzido número de estudos e sua heterogeneidade, os resultados apresentados devem ser avaliados com parcimônia.

Somatosensory and psychosocial profile of patients with painful temporomandibular joint clicking.

BACKGROUND: Determining the somatosensory and psychosocial profile of patients with painful temporomandibular joint (TMJ) clicking can help to understand the pain mechanisms in cases of TMJ clicking. OBJECTIVE: To characterise the somatosensory and psychosocial profile of patients with painful TMJ clicking when compared to patients with painless TMJ clicking and healthy control group. METHODS: Somatosensory and psychosocial functions were assessed in 90 individuals: patients with painful TMJ clicking (n = 30); patients with painless TMJ clicking (n = 30); and healthy controls (n = 30). Somatosensory profile included: mechanical pain threshold (MPT); wind-up ratio (WUR); pressure pain threshold (PPT); and conditioned pain modulation (CPM). Psychosocial profile included some questionnaires: Pittsburgh Sleep Quality Index (PSQI); Pain Vigilance-Awareness Questionnaire (PVAQ); Pain Catastrophizing Scale (PCS); Tampa Scale for Kinesiophobia (TSK); Perceived Stress (PSS); and State-Trait Anxiety Inventory (STAI). All variables were compared among all groups. RESULTS: Higher values of MPT and WUR; lower PPT; less efficient CPM; and higher scores of PSQI, PVAQ, PCS, and TSK were found in patients with painful TMJ clicking when compared to the other two groups (P < .001). Patients with painless TMJ clicking showed lower PPT and higher scores of PVAQ and TKS than the healthy control group. PSS and STAI data had no differences. CONCLUSION: Patients with painful TMJ clicking had abnormalities in the somatosensory profile, with a significant somatosensory gain of function (more sensitive) to mechanical pain tests and less efficient CPM. Poor sleep quality along with higher levels of hypervigilance, pain catastrophising, and kinesiophobia were features of psychosocial profile of these patients.

Immunohistochemical panel of degenerated articular discs from patients with temporomandibular joint osteoarthritis.

BACKGROUND: Temporomandibular joint osteoarthritis (TMJOA) is a progressive degenerative disease caused by imbalance between anabolic and catabolic stimuli. OBJECTIVE: The aim of this study was to evaluate histopathological changes, collagen degeneration and the expression of eleven TMJOA biomarkers in articular discs. METHODS: Specimens were obtained from eight female patients submitted to discectomy. Discs were divided into anterior band (AB), intermediate zone (IZ) and posterior band (PB) for computerised histomorphometric analyses. Each was assigned a histopathological degeneration score (HDS). Collagen degeneration was assessed with Picrosirius-polarisation method. Biomarkers were evaluated through immunohistochemistry, including IGF-1, OPG, VEGF, TNF-α, FGF-23, IHH, MMP-3, MMP-9, TGF-ß1 , BMP-2 and WNT-3. Image processing software was used to calculate average immature collagen ratios and immunostained areas. Spearman rank tests were applied to verify correlations, with significance level of 0.05. RESULTS: The HDS showed negative correlation with expression of VEGF in IZ and PB (P < .05) and positive with TNF-α in AB (P < .01). Collagen degeneration correlated with TGF-ß1 (P < .05), BMP-2 (P < .01) and IHH (P < .05) immunostained areas in the IZ; TGF-ß1, BMP-2 and IHH expression correlated among each other in AB and IZ (P < .05). CONCLUSION: Angiogenesis and tissue fragmentation may result from aberrant physiologic responses mediated by VEGF and TNF-α, compromising TMJ discs during OA progression. The expression of TGF-ß1, BMP-2 and IHH could be related to collagen degeneration in displaced discs and may participate in TMJOA pathogenesis.

A clinical-based protocol of diagnosis of temporomandibular joint open lock and treatment with arthrocentesis.

PURPOSE: Arthrocentesis of the temporomandibular joint (TMJ) is a minimally invasive surgical procedure that provides good clinical results such as the improvement of jaw movements. It also helps to balance the synovial liquid viscosity and relieve TMJ pain by the washout of inflammatory components from the upper compartment. The purpose of this study is to report a case series of patients submitted to a clinical-based protocol of diagnosis of TMJ joint open lock and treatment with arthrocentesis. MATERIAL AND METHODS: Patients suffering from a recurrent unilateral open lock of the TMJ were submitted to one arthrocentesis of the affected TMJ and all of them reported that the open lock was caused by daily stomatognathic activities. To decide the arthrocentesis as the initial treatment of these patients, the authors followed a rational protocol of diagnosis. RESULTS: Ten patients were included in the present study. No complications occurred during arthrocentesis. Immediately, 1 week, 1 month, and 6 months after arthrocentesis, patients did not suffer from open lock or disc click anymore. They also reported no more pain because it was strictly related to the disc click. CONCLUSIONS: All patients of the present study improved from the open lock and disc click of the affected TMJ for 6 months after arthrocentesis. The clinical-based protocol of diagnosis of TMJ open lock reported in the present study, followed by the treatment with arthrocentesis is a reasonable, low-cost, and safe method to treat patients with the acute open lock.

Association between temporomandibular joint disc position evaluated by magnetic resonance imaging and mandibular condyle inclination evaluated by computed tomography.

Temporomandibular joint disc displacement is common in the world's population and could be associated with bone and functional characteristics of the temporomandibular joint. The aim of these study was to analyse the association between temporomandibular joint disc position evaluated by magnetic resonance imaging (MRI) and the inclination of the mandibular condyle evaluated by computed tomography (CT). One hundred and seventy temporomandibular joints (TMJ) were retrospectively analysed. The temporomandibular disc position was evaluated by MRI and classified into three types: normal (N), disc displacement with reduction (DDWR) and disc displacement without reduction (DDWoR). The mandibular condyle measurements evaluated by CT included horizontal, sagittal and coronal inclination. ANOVA followed by post hoc Tukey's test was used to evaluate the interaction between condylar inclination and disc position. There was an association between disc position and the horizontal and sagittal condylar inclination (P < .05). There are statistically significant differences in the mean of horizontal and sagittal inclination of the mandibular condyle between the DDWoR and the other disc positions (P = .002 and P = .004). Disc position was not statistical associated with coronal inclination of condyle (P > .05). These results indicate that the inclination of the mandibular condyle may be different in TMJ with various disc position. A more medial horizontal inclination and a more posterior sagittal inclination of the mandibular condyle are associated with DDWoR.

The effectiveness of photobiomodulation in the management of temporomandibular pain sensitivity in rats: behavioral and neurochemical effects.

This study analyzed the effects of photobiomodulation (PBM) with low-level laser therapy on nociceptive behavior and neuronal activity in the trigeminal nucleus after experimental unilateral temporomandibular joint (TMJ) disc injury. The animals were divided into 4 groups (n = 10 each): group 1, surgical injury of the articular disc and PBM; group 2, sham-operated subjected to PBM; group 3, surgical injury of the articular disc; and group 4, control (Naïve). Ten sessions of PBM were performed using GaAs laser with a wavelength of 904 nm, power of 75 W pico, average power of 0.043 W, area of the beam of 0.13 cm2, duration of the pulses of 60 nseg (in the frequency of 9500 Hz), energy density of 5.95 J/cm2, energy per point of 0.7 J, and power density of 333.8 mW/cm2, and the irradiation was done for 18 s per point. Neuropathic symptoms were evaluated using the von Frey test. Trigeminal ganglion samples underwent immunoblotting to examine the expression of substance P, vanilloid transient potential receptor of subtype-1 (TRPV-1), and peptide related to the calcitonin gene (CGRP). There was a total decrease in pain sensitivity after the second session of PBM in operated animals, and this decrease remains until the last session. There was a significant decrease in the expression of SP, TRPV-1, and CGRP after PBM. Photobiomodulation therapy was effective in reducing nociceptive behavior and trigeminal nucleus neuronal activity after TMJ disc injury.

Caracterización clínica, imagenológica y quirúrgica de la discopexia en pacientes con artropatía discal de la art iculación temporomandibular. Estudio de serie de casos / Clinical, imagenological and surgical characterization of discopexia in patients with discal arthropathy of the temporomandibular articulation. Case series study

Introducción: El desplazamiento discal es la artropatía temporomandibular más común. Los desplazamientos discales sin Reducción (DDSR) constituyen una condición clínica en la cual en boca cerrada el disco articular se encuentra desplazado completamente, sin contacto con la vertiente anterior de la cabeza mandibular y en boca abierta el disco no es recapturado. El tratamiento quirúrgico realizado es la discopexia. A pesar de toda la información presente en la bibliografía aún existe controversia entre la elección de tratamiento del DDSR. Objetivo: Presentar la experiencia clínica, quirúrgica e imagenológica de la discopexia en DDSR mediante la presentación de una serie de casos. Metodología: Se realizó un estudio retrospectivo de las historias clínicas del Servicio de Cirugía Bucal y Maxilofacial del hospital General del Oeste "Dr. José Gregorio Hernández", Distrito Capital, Venezuela, entre 2014-2018; se seleccionaron seis casos clínicos que presentaban DDSR, los cuales fueron intervenidos con discopexia, posteriormente se evaluaron clínica e imagenológicamente. Resultados: Los seis casos presentaron particularidades en el transcurso del tratamiento desde la fase inicial y en la postoperatoria. Se evidenció una franca mejoría en las manifestaciones clínicas, en contraste, la resonancia magnética postoperatoria, el cual reveló el desplazamiento discal nuevamente. Conclusiones: La estabilidad en la reubicación discal postoperatoria depende de múltiples factores, tales como la estabilidad oclusal, muscular y presencia de hábitos parafuncionales. El aumento en la apertura bucal fue la característica común en todos los pacientes de este estudio así como la disminución de la sintomatología dolorosa.

Introduction: Disc displacement is the most common temporomandibular arthropathy. The displacements without reduction (DDSR) become a clinical practice in the closed mouth the articular disc is completely displaced, without contact with the anterior vertical of the mandibular head and in the open mouth the disc is not recaptured. The surgical treatment performed is discopexy. Despite all the information present in the literature there is still controversy between the choice of treatment of the DDSR. Objective: To present the clinical, surgical and imaging experience of discopexy in DDSR by presenting a series of cases. Methodology: A retrospective study of the clinical records of the Oral and Maxillofacial Surgery Service of the General del Oeste Hospital "Dr. José Gregorio Hernández ", Capital District, Venezuela, between 2014-2018; Six clinical cases were selected that presented DDSR, which were operated on with discopexy, and then evaluated clinically and imaging. Results: The six cases present particularities in the course of the treatment from the initial phase and in the postoperative period. The evidence is improved in the clinical manifestations, in contrast, in the postoperative magnetic resonance, in the articular disc it moved again. Conclusions: Stability in postoperative disc relocation depends on multiple factors, such as occlusal stability, muscle stability and the presence of parafunctional habits. The increase in oral opening was the common feature in all the patients for this study, as well as the decrease in painful symptoms.

Changes in temporomandibular joint anatomy, changes in condylar translation, and their relationship with disc displacement: magnetic resonance imaging study.

OBJECTIVE: To assess changes in the articular surfaces of the temporomandibular joint (TMJ) and in condylar translation, as detected by magnetic resonance imaging (MRI), determining whether such changes correlate with disc displacement. MATERIALS AND METHODS: We retrospectively analyzed the MRI scans of 2076 TMJs of 1038 patients with symptoms of temporomandibular disorder. We attempted to determine whether articular disc deformity and changes in condylar translation, as well as changes in the articular surfaces of the condyle, glenoid fossa, and articular eminence, correlated with disc displacement. RESULTS: Disc displacement with reduction was associated with changes in the shape of the articular eminence. Disc displacement without reduction was most strongly associated with disc deformity, condylar degeneration, glenoid fossa degeneration, and effusion. Neither decreases nor increases in condylar translation were associated with disc deformity, degenerative bone changes, or disc displacement. CONCLUSION: Changes in the shape of the articular eminence seem to predispose to progression of internal derangement of the TMJ.

OBJETIVO: Verificar a correlação entre as alterações das superfícies articulares e da translação condilar com o deslocamento de disco da articulação temporomandibular. MATERIAIS E MÉTODOS: Foram analisados os exames de ressonância magnética de 2076 articulações temporomandibulares de pacientes sintomáticos de desordens temporomandibulares. A deformidade do disco articular, as alterações nas superfícies articulares do côndilo, da fossa glenoide e da eminência articular e as alterações na translação condilar foram correlacionadas com o deslocamento do disco. RESULTADOS: O deslocamento do disco com redução demonstrou associação com as alterações de forma da eminência articular. O deslocamento do disco sem redução apresentou maior associação com a deformidade do disco, degeneração do côndilo e da fossa glenoide e efusão. Diminuição e aumento da translação condilar não apresentaram associação com a deformidade do disco, com alterações ósseas degenerativas, nem com o deslocamento do disco. CONCLUSÃO: Mudanças na forma da eminência articular parecem predispor à progressão do desarranjo interno da articulação temporomandibular.

Changes in temporomandibular joint anatomy, changes in condylar translation, and their relationship with disc displacement: magnetic resonance imaging study / Ressonância magnética das alterações anatômicas e translação condilar da articulação temporomandibular e suas relações com o deslocamento do disco

Abstract Objective: To assess changes in the articular surfaces of the temporomandibular joint (TMJ) and in condylar translation, as detected by magnetic resonance imaging (MRI), determining whether such changes correlate with disc displacement. Materials and Methods: We retrospectively analyzed the MRI scans of 2076 TMJs of 1038 patients with symptoms of temporomandibular disorder. We attempted to determine whether articular disc deformity and changes in condylar translation, as well as changes in the articular surfaces of the condyle, glenoid fossa, and articular eminence, correlated with disc displacement. Results: Disc displacement with reduction was associated with changes in the shape of the articular eminence. Disc displacement without reduction was most strongly associated with disc deformity, condylar degeneration, glenoid fossa degeneration, and effusion. Neither decreases nor increases in condylar translation were associated with disc deformity, degenerative bone changes, or disc displacement. Conclusion: Changes in the shape of the articular eminence seem to predispose to progression of internal derangement of the TMJ.

Resumo Objetivo: Verificar a correlação entre as alterações das superfícies articulares e da translação condilar com o deslocamento de disco da articulação temporomandibular. Materiais e Métodos: Foram analisados os exames de ressonância magnética de 2076 articulações temporomandibulares de pacientes sintomáticos de desordens temporomandibulares. A deformidade do disco articular, as alterações nas superfícies articulares do côndilo, da fossa glenoide e da eminência articular e as alterações na translação condilar foram correlacionadas com o deslocamento do disco. Resultados: O deslocamento do disco com redução demonstrou associação com as alterações de forma da eminência articular. O deslocamento do disco sem redução apresentou maior associação com a deformidade do disco, degeneração do côndilo e da fossa glenoide e efusão. Diminuição e aumento da translação condilar não apresentaram associação com a deformidade do disco, com alterações ósseas degenerativas, nem com o deslocamento do disco. Conclusão: Mudanças na forma da eminência articular parecem predispor à progressão do desarranjo interno da articulação temporomandibular.