Presence Of Temporomandibular Disorders Research Articles

The Link Between Temporomandibular Disorders and Jaw Functional Limitations Among Chinese Adolescents

BackgroundCurrently, there is still controversy surrounding the relationship between temporomandibular disorders (TMDs) symptoms and jaw functional limitations. We investigated the distribution of TMDs in senior high school students, including both the number and types of symptoms, and assessed their association with jaw functional limitations. Furthermore, we explored sex differences in these associations. MethodsThis study was conducted at a public high school in Hefei, Anhui Province, China, with data collected from September to October 2022. All subjects completed questionnaires assessing the anamnestic symptoms of TMDs and the Jaw Functional Limitation Scale (JFLS), and examinations were performed by trained dentists according to the Diagnostic Criteria for TMD. Data were analysed using the Kruskal–Wallis, Mann–Whitney U, and Chi-square tests. ResultsThe mean age of the participants (N = 2890) was 17.2 ± 0.14 years and 38.9% were females (61.1% were males). Limitations in self-assessed jaw function were associated with the presence of TMDs (P < .05). Participants with more symptoms reported significantly high levels of functional limitations (P < .05). Compared to male adolescents, female adolescents more commonly experienced TMDs pain and tended to have more symptoms (P < .05). However, no sex differences were observed in most associations between TMDs and jaw functional limitations. ConclusionTMDs-positive symptoms are common in adolescents. Female adolescents were more affected by TMDs symptoms than male adolescents. Individuals with more TMDs symptoms have greater jaw functional limitations.

Impact of Fear of COVID-19, Depression, Anxiety and Stress on Temporomandibular Disorders in Peruvian Dental Students in the Post-Pandemic Period: A Multivariable Regression Analysis.

Background: Dentists, who frequently encounter potentially infected patients, have experienced significant changes worldwide due to the COVID-19 pandemic. The aim of this study was to evaluate the impact of the fear of COVID-19, depression, anxiety and stress on the presence of temporomandibular disorders (TMD), taking into account possible confounding variables, in Peruvian dental students during the post-pandemic period. Methods: This analytical cross-sectional study assessed 607 Peruvian dental students from two regions of Peru. The study utilized the Depression Anxiety Stress Scales-21 (DASS-21), the Fear of COVID-19 Scale (FCV-19S) and the Short Form of the Fonseca Anamnestic Index (SFAI). Possible confounding variables were sex, age, year of study, marital status, place of origin, area of residence, history of mental illness and living with people vulnerable to COVID-19. For the multivariable analysis, we utilized a Poisson regression model with an adjusted robust variance. The significance level was set at p < 0.05. Results: The rates of depression, anxiety, stress, fear of COVID-19 and temporomandibular disorders were 47.0%, 50.4%, 35.9%, 30.6% and 54.2%, respectively. Moreover, the study revealed that students with depression and anxiety were 38% and 75% more likely to have temporomandibular disorders compared to those without depression (APR = 1.38, 95% CI: 1.15-1.66) and anxiety (APR = 1.75, 95% CI: 1.44-2.13), respectively. Similarly, the likelihood of presenting temporomandibular disorders was 55% higher in women than in men (APR = 1.55, 95% CI: 1.28-1.87). Furthermore, we found that stress and fear of COVID-19 did not determine the development of temporomandibular disorders (p > 0.05). Conclusions: Almost half of the dental students experienced depression, anxiety and TMD in the post-pandemic period. In addition, depression and anxiety were influential factors in the occurrence of TMDs, with the female gender being a risk factor. However, factors such as fear of COVID-19, stress, age, year of study, marital status, place of origin, area of residence, history of mental illness or living with people vulnerable to COVID-19 were not significant.

Comparison of Machine Learning Algorithms Fed with Mobility-Related and Baropodometric Measurements to Identify Temporomandibular Disorders.

Temporomandibular disorders (TMDs) refer to a group of conditions that affect the temporomandibular joint, causing pain and dysfunction in the jaw joint and related muscles. The diagnosis of TMDs typically involves clinical assessment through operator-based physical examination, a self-reported questionnaire and imaging studies. To objectivize the measurement of TMD, this study aims at investigating the feasibility of using machine-learning algorithms fed with data gathered from low-cost and portable instruments to identify the presence of TMD in adult subjects. Through this aim, the experimental protocol involved fifty participants, equally distributed between TMD and healthy subjects, acting as a control group. The diagnosis of TMD was performed by a skilled operator through the typical clinical scale. Participants underwent a baropodometric analysis by using a pressure matrix and the evaluation of the cervical mobility through inertial sensors. Nine machine-learning algorithms belonging to support vector machine, k-nearest neighbours and decision tree algorithms were compared. The k-nearest neighbours algorithm based on cosine distance was found to be the best performing, achieving performances of 0.94, 0.94 and 0.08 for the accuracy, F1-score and G-index, respectively. These findings open the possibility of using such methodology to support the diagnosis of TMDs in clinical environments.

Investigating the effect of depression on clinical symptoms of temporomandibular disorder in young stressful men.

The objective of this study was to investigate the relationship of the depression level with temporomandibular disorders (TMDs) in young conscripts as a population with chronic stresses. A total number of 144 male conscripts with chronic stress and different levels of depression were assigned to four groups according to the Beck's Depression Inventory (BDI). The control group consisted of age-matched male conscripts without chronic stress. The diagnosis of TMD was made according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD). Data were analyzed usingMann-Whitney and chi-square tests. The participants with severe depression were significantly more susceptible to have TMD (p = .001) followed by the moderate depression, borderline clinical depression, mild mood disturbance, and control groups. The TMD diagnoses were more prevalent within depression groups compared with the control population (p = .01). The level of depression is directly associated with the presence of TMD in young men with chronic stress.

Temporomandibular disorder and somatic symptoms: Relations to 'fear of missing out' and other negative emotional states.

The association between the 'fear of missing out (FOMO)' and physical symptoms has not been widely explored. This study aimed to investigate the relationship between FOMO and other negative emotions with Temporomandibular disorder (TMD) and somatic symptoms in young adults. The correlations between the various physical and emotional variables were also established. TMD and somatic symptoms were appraised with the Short-form Fonseca Anamnestic Index, quintessential five TMD symptoms of the Diagnostic Criteria (DC)/TMD, and Patient Health Questionnaire-15. FOMO and other negative emotional states were assessed with the FOMO Scale and Depression, Anxiety, Stress Scales-21 (DASS-21). Data were evaluated using non-parametric tests/correlation and regression analysis (α = 0.05). While only negative affectivity (total DASS), anxiety, and stress differed significantly between those without and with TMDs, significant variances in FOMO and all DASS-21 constructs were discerned between individuals without and with somatization. Conclusions: Individuals with orofacial pain and more severe somatic symptoms have higher levels of negative emotions including FOMO. While somatization increased the prospect of TMDs, being female, presence of TMDs, and negative affectivity were risk factors for somatization in young adults. Asian young adults appear to be disposed to somatization, and TMDs may be a form of functional somatic syndromes. Recognition of somatic symptoms and emotional distress, including FOMO, is essential for person-centric TMD care.

The "5Ts" screening tool: Enhancements and threshold values for effective TMD identification.

This study aimed to enhance the quintessential "five temporomandibular disorder (TMD) symptoms" (5Ts) screener by incorporating frequency options and distinguishing between TMJ and muscle pain. The diagnostic accuracy along with cut-off points for the effective identification of TMDs was also established. Participants, aged ≥18 years, were recruited from a university-based hospital. After completing surveys encompassing demographic data and the enhanced 5Ts (with frequency options [5Ts-F] and differentiation of TMJ/muscle pain [6Ts-F]), protocolized interviews and clinical examinations were performed following DC/TMD. The diagnostic accuracy and best cut-off points were determined with the area under the receiver operating characteristic curves (AUCs). 324 participants were recruited (mean age 30.0 ± 11.4 years). Among these, 86.4% had TMDs. 5Ts exhibited high diagnostic accuracy for detecting all TMDs (AUC = 0.92) with sensitivity/specificity values of 83.9%/88.6%. Both 5Ts-F and 6Ts-F had slightly better accuracy (AUCs = 0.95/0.96), comparable sensitivity, and superior specificity (97.7%) compared to 5Ts. The best cut-off points were 1.5 for 5Ts and 2.5 for 5Ts-F/6Ts-F. Although all three TMD screeners presented high diagnostic accuracy, 5Ts-F/6Ts-F had notably improved specificity. 5Ts scores of >1.5 and 5Ts-F/6Ts-F scores of >2.5 are to be applied for screening the presence of TMDs.

Orthodontic-surgical Management of the Horizontal Unilateral Condylar Hyperplasia

Introduction: To describe the orthodontic-surgical approach we used in a sample of patients affected by the horizontal type of Unilateral Condylar Hyperplasia (UCH), that is a progressive disease that leads to mandibular asymmetry and midline deviation. Material and Methods: A retrospective observational cohort study was designed on 29 consecutive patients affected by horizontal UCH (23 females, 6 males; mean age, 22.4 y.o. ± 7.9) treated in the Units of Orthodontics and Maxillo-Facial Surgery. Descriptive statistics was performed. Correlations were tested between type of surgery and stage of skeletal maturation, presence of Temporo-mandibular Disorders, and condylar activity, evaluated with SPECT. Duration was correlated with type of surgery, and the mean duration of therapy was compared between patients who underwent condylectomy and those who underwent orthognathic surgery. Results: Females were more affected than males and had higher mean age. Temporo-mandibular Disorders were present in 31% of the sample. All patients with positive SPECT (15) were treated with condylectomy, alone or associated with orthognathic surgery, followed by post-surgical orthodontics. Patients with negative SPECT were treated with orthognathic surgery if adult (12), condylectomy if in age of skeletal growth (2). Discussion: The choice of the therapeutic approach has depended on skeletal maturation, condylar activity, and extent of dental compensations. Early condylectomy eliminates the etiologic cause of the Hyperplasia in patients with active condylar growth. In patients in age of growth, either if positive or negative to SPECT, early TMJ surgery eliminates the asymmetric growth and leads to symmetrization of the mandibular growth rate, acting as interceptive treatment.

Prevalence and Clinical Characteristics of Temporomandibular Disorders in Adults: An Epidemiological Study in the Mediterranean Region of Turkiye

The prevalence and clinical characteristics of temporomandibular disorders (TMD) in the Mediterranean region of Türkiye have not yet been thoroughly investigated. Objective: This study aimed to determine the prevalence and severity of TMD in a sample of the population in this region and to characterize the clinical findings related to TMD. Methods: Four hundred and one participants were included in this study. “Presence of TMD” in the participants was evaluated using the Fonseca Anamnestic Index. Through clinical examination, the findings in the participants were classified as limited mouth opening, deviation, temporomandibular joint (TMJ) sounds, TMJ pain, and muscle pain. Results: The prevalence of TMD was found to be 66.8%, with “Mild TMD” being the most frequent diagnosis among the participants. Clinical findings related to TMD were detected in 48.6% of the participants, and TMJ sounds were the most common clinical finding. TMD was most commonly found in participants over the age of 52, and clinical findings related to TMD were most common in participants between the ages of 25 and 38. In addition, a relationship was found between “Presence of clinical findings” and the gender and age of the participants (p &lt; 0.001 for both comparisons). Conclusion: The results show that females may be more prone to TMD than males. During clinical examinations, it should be considered that “Presence of clinical findings” may be related to gender and age.

Psychological factors in Temporomandibular disorders and somatization: A multidimensional analysis of personality, coping, and distress among young adults.

The association of Temporomandibular disorder (TMD) and somatic symptoms with the psychological variables of personality, coping, and distress were analyzed in young adults. Physical and psychological correlates were also explored along with the risk factors for TMDs/somatization. Participants were enlisted from a local university and the presence of TMDs and somatic symptoms was determined with the Short-form Fonseca Anamnestic Index and Patient Health Questionnaire-15. The psychological variables of personality, coping, and distress was assessed with the Big-Five Personality Inventory-10, brief-COPE Inventory, and Depression, Anxiety, Stress Scales-21 accordingly. Statistical evaluations were performed with the Mann-Whitney U test, Spearman's correlation, and logistic regression analyses (α = 0.05). Among the 455 participants (mean age 22.7 ± 1.2 years), 18.2% and 5.7% had TMDs and medium-to-high somatization respectively. Participants with TMDs exhibited substantially higher somatization and psychological distress scores than those with no TMDs. Significant differences in TMD, conscientiousness, extraversion, and psychological distress scores were observed between participants with no-to-mild and medium-to-high somatization. The association between TMD and somatization scores, albeit significant, was weak. Neuroticism and dysfunctional coping style were moderately correlated to general distress, depression, anxiety, and stress (rs = 0.44-0.62). Findings suggest that anxiety is the main risk factor for the presence of TMDs and medium-to-high somatization in non-clinical young adults while conscientiousness is a protective factor for somatization.

Sleep Bruxism and Orofacial Pain in Patients with Sleep Disorders: A Controlled Cohort Study.

The gold standard for the diagnosis of sleep bruxism (SB) is laboratory polysomnography (L-PSG) recording. However, many clinicians still define SB using patients' self-assessment and/or clinical tooth wear (TW). The purpose of this cross-sectional controlled study was to compare the prevalence of TW, head-neck muscles sensitivity and Temporomandibular Disorders (TMD) between SB and non-SB patients diagnosed with L-PSG in a cohort of patient with sleep disorders (SD). 102 adult subjects with suspected SD underwent L-PSG recording to assess the presence of sleep disorder and SB. TW was clinically analyzed using TWES 2.0. The pressure pain threshold (PPT) of masticatory muscles were assessed using a Fisher algometer. Diagnostic criteria for TMD (DC/TMD) were used to evaluate the presence of TMD. SB self-assessment questionnaires were administered. TWES score, PPT, TMD prevalence and questionnaire results were compared between SB and non-SB patients. 22 SB patients and 66 non-SB patients with SD were included. No significant differences emerged between groups in regards to TW, the PPT values, or SB's self-assessment questionnaires as well the prevalence of TMD. in a SD population, TW is not pathognomonic of active SB and SB self-assessment is not reliable. There seems to be no correlation between SB, TMD and head/neck muscle sensitivity.

Stomatognathic Risk Factors and Clinical Manifestations of Temporomandibular Disorders in Indian Population: A Case-control Study.

This study was aimed to compare the risk factors and associated clinical manifestations of patients with temporomandibular disorders (TMDs) in the Indian population. A total of 52 patients were explored according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) and compared with 48 controls. The mean age of the study group was 30.96 ± 11.60 years, 41% were males and 59% were females. The mean age in the control group was 31.5 ± 9.9 years (37.5% males), measuring differences in TMD risk factors (self-perceived stress, parafunctions, occlusal interferences, history of orthodontic treatment, and/or extraction). The most common sign observed in the selected subjects was the joint sound (clicking) (42%), followed by mandibular deviation 39% as the second most common sign. Myofascial pain (MFP) (single or multiple diagnoses) was the most frequent diagnosis (n = 40, 76%), followed by disc displacement with reduction (DDWR) (32.1%), arthralgia (30%), and disc displacement without reduction (DDWoR) (7.6%). More than one DC/TMD diagnosis was established in 63.2% of the patients. The risk factors like presence of clenching, stress perception, parafunctions, tooth wear, and occlusal interferences were significantly more frequent in all the cases than in the respective controls. In the studied population, the presence of TMD was found to be positively related to factors namely female gender, parafunction, occlusal interferences, psychological stress, and tooth wear. Myofascial pain is the commonest diagnosis (either single or in combination). It is followed by DDWR (either single or in combination with others). Double diagnosis is also common. Temporomandibular disorders showed a female predilection and were found to be positively related to factors, viz., parafunction, occlusal interferences, stress, and tooth wear. Clinicians should also be aware of common clinical manifestations of TMDs and their related stomatognathic risk factors to provide comprehensive oral care and to identify such factors for disease prevention.

Relationship between self-reported pain, pain threshold, pain catastrophization and quality of life in patients with TMD.

The aim of this study was to verify if there is a relationship between self-reported pain, PPT (pressure pain threshold) of the masseter, temporal and sternocleidomastoid muscles, pain catastrophizing and quality of life in patients with TMD (temporomandibular disorder) of muscular origin. Ninety-seven patients with muscular TMD (TMD group) and 97 asymptomatic (control group) were included in the study. The evaluation methods used were: 1) Self-reported pain was assessed using the Visual Analogue Scale (VAS) for questions 7, 8 and 9 of the RDC/TMD Axis I questionnaire; 2) The PPT assessment was performed using a digital algometer on the masseter, temporal, and sternocleidomastoid muscles (both sides); 3) Pain catastrophizing was assessed using the PCS (Pain Catastrophizing Scale); and 4) Oral health-related quality of life was assessed using the OHIP-14 (Oral Healthy Impact Profile-14). Data were submitted to Spearman correlation and logistic regression (p<0.05). There were significant positive correlations between self-reported pain (VAS-Q7, VAS-Q8 and VAS-Q9), pain catastrophizing (PCS-Helplessness, PCS-Magnification, PCS-Rumination and PCS-Total) and quality of life (OHIP-14) (p<0.05). There was a significant negative correlation of self-reported pain (VAS-Q8) with PPT of the temporal (left) and sternocleidomastoid (both sides) (p<0.05). The rumination and magnification domains increased the chance of high self-reported pain in all situations (VAS-Q7, VAS-Q8 and VAS-Q9) (p<0.05). The helplessness domain only increased the chance of high self-reported pain for VAS-Q8 (p<0.05). The presence of TMD of muscular origin, high self-reported pain (VAS-Q7) or pain catastrophizing increased the chance of a low quality of life in relation to the control group (p<0.05). In addition, the reduction in sternocleidomastoid PPT increased the chance of poor quality of life (p<0.05). Key words:Myofascial pain syndromes, pain catastrophizing, myalgia, quality of life, surveys and questionnaires, temporomandibular joint disorders.

Disfunção temporomandibular e a sua relação com a Ansiedade perante o Desempenho musical em Violinistas- um estudo transversal

INTRODUCTION Temporomandibular disorder in violinists is a health condition that, in its severe forms, can have negative consequences over time. The aim of this study was to evaluate the prevalence of temporomandibular disorders in violinists and its relationship with anxiety about musical performance. METHODOLOGY A cross-sectional study was carried out on violinists from the central region of Portugal. The information was collected through an online survey. The survey included questions for sociodemographic characterization, years of study of the instrument, weekly time dedicated to the study, the disabling temporomandibular pain-screening instrument for screening for pain because of temporomandibular disorders, the index of inability to assess the impact on functionality, as well as the anxiety index towards Kenny’s musical performance. RESULTS Forty-nine violinists participated with a mean age of 27.9±9.3 years, mostly female (n=37, 75.5%). The average number of years of violin study was 17.5±7.5 years, and the average number of hours of study per week was 11.8±8.8 hours. The prevalence of temporomandibular disorders was reported by 28.6% of the participants, and a positive association was observed between the presence of temporomandibular disorders and the disability index of temporomandibular disorders (r=0.63; p&lt;0.001), as well as with anxiety about musical performance (r=0.53; p&lt;0.001). CONCLUSION For the sample studied, at least one in four violinists has temporomandibular disorders, which is associated with disability and anxiety about musical performance. These findings reinforce the need to sensitize instrumentalists and music teachers about the health risks, as well as the potential impact that this may have on musical performance. Future works may deepen the factors that explain the relationship between anxiety and temporomandibular disorders.

Temporomandibular Disorders in Patients with Occlusal Interferences

Objective: To assess the temporomandibular disorders among patients with occlusal interferences.&#x0D; Study Design: Cross-sectional study.&#x0D; Place and Duration of Study: Prosthodontics Department, Armed Force Institute of Dentistry, Rawalpindi Pakistan, from Jul to Dec 2020.&#x0D; Methodology: Consecutive patients presenting with symptoms of occlusal interferences, including pain, clicking and limited mouth opening to the prosthodontics department, were included in the study. History was taken from each patient, and a detailed oral checkup was done to evaluate the presence or absence of TMDs in patients with occlusal interferences after informed consent.&#x0D; Results: The mean age was 30.44±5.95 years. Out of 380 patients with occlusal inferences, 208(54.7%) patients were diagnosed with temporomandibular disorders. No significant difference was found in the distribution of TMDs with regard to age (p=0.559) and gender (p=0.755).&#x0D; Conclusion: The presence of temporomandibular disorders among patients with occlusal interferences was quite common.This presence is equally common in different age groups and both genders.Keywords: Balancing interferences, Occlusal interferences, Protrusive interferences, Temporomandibular joint, Temporomandibular disorders,

Updating The General Practitioner on The Association Between Teeth Loss and Temporomandibular Disorders: A Systematic Review.

The belief about a possible association between the absence of one or more teeth and the presence of temporomandibular disorders (TMD), although old, is still present among the dental class. Although evidence points to a lack of association between loss of posterior support and the presence of TMD, we do not have critical studies on the extent, quantity, or location of these losses. In this sense, this systematic review aims to investigate the association between tooth loss and the presence of TMD signs or diagnostic subgroups. Search strategies using a combination of keywords tooth loss and TMDs were performed in six databases (PubMed, Embase, Web of Science, Livivo, Lilacs, and Scopus) and gray literature from August to September 2020. Observational studies that investigated the association between tooth loss in TMD were considered. The risk of bias was assessed using the Joanna Briggs Institute (JBI) Critical Assessment Checklist for cross-sectional analytical studies, case-control, and cohort studies. Finally, the level of certainty measured by the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) was assessed. Six articles were included in the review according to the eligibility criteria. Of these, five had a high risk of bias and one had a moderate risk. Only one study showed an association between the loss of posterior teeth and the presence of joint sounds and joint pain, the others found no significant association with sign or TMD subgroups diagnostic.There is no scientific evidence to support the association between one or more tooth loss and the presence of TMD signs and symptoms or diagnostic subgroups.

Hemicrania continua and Temporomandibular Disorders Co-Presentation. Case Report

Hemicrania continua is an uncommon headache disorder that requires complete response to indomethacin for its diagnosis, that becomes on most of the cases chronic pain resilient to treatment. On the other hand, temporomandibular pain is very common on the general population and happens to be undiagnosed most of the time when headache or migraines are happening at the same time. In this case we aim to highlight the importance of treating all concomitant diagnosis for a better long-term prognosis. In this paper, a case of a 51-year-old male with chronic resilient facial pain is presented. The patient described right sided facial pain with six years of evolution that started with no triggers. The pain was described as constant bilateral pressure being worse on the right side, located on the temples, masseteric and preauricular areas; with an intensity of 6 on a scale of 0 to 10. It is accompanied by episodes of paroxysmal pulsating hemifacial pain with autonomic symptoms (rhinorrhea, conjunctival injections and lacrimation). The pain during exacerbations was located on the right periorbital and hemifacial area and with an intensity of 10 on a scale of 0 to 10, lasting a few minutes to more than 2 hours. After the clinical examination and pain history, the patient was given the diagnosis of hemicrania continua and masticatory myofascial pain. He was started on Indomethacin 25mg twice a day and started on temporomandibular therapy (self-care, jaw exercises, motivation and advice for stress management). Three months after the first evaluation the patient reported total resolution of his symptoms. The main goal of this article is to highlight that the presence of temporomandibular disorders is common in patients with headaches, for which it is necessary to carry out a comprehensive approach for both entities, which include the therapies for treating axis I diagnosis and behavioral management for axis II, this including most of the time a multidisciplinary human centered approach.

Masticatory Myoelectric Side Modular Ratio Asymmetry during Maximal Biting in Women with and without Temporomandibular Disorders

There is no consensus on the role of electromyographic analysis in detecting and characterizing the asymmetries of jaw muscle excitation in patients with temporomandibular disorders (TMD). To analyze the TMD patients (n = 72) in comparison with the healthy controls (n = 30), the surface electromyography (sEMG) of the temporalis anterior muscle (TA) and masseter muscle (M) was recorded while a maximal biting task was performed. The differences in the asymmetry of the relationship between the masseter muscles were assessed in a module to determine the sensitivity (Sn) of binomial logistic models, based on the dominance of the TA or the M muscle, in accurately predicting the presence of TMD. All assumptions were met, and comparisons between the groups showed significant differences for the TA muscle ratio (p = 0.007), but not for the M muscle ratio (p = 0.13). The left side was predominant over the right side in the TMD group for both the TA (p = 0.02) and M muscles (p = 0.001), while the non-TMD group had a higher frequency of the right side. Binary logistic regression showed a significant model (χ2 = 9.53; p = 0.002) for the TA muscle with Sn = 0.843. The model for the M muscle also showed significance (χ2 = 8.03; p = 0.005) with Sn = 0.837. The TMD patients showed an increased TA muscle ratio and asymmetry of left dominance, compared to the healthy subjects. Both of the binomial logistic models, based on muscle dominance TA or M, were moderately sensitive for predicting the presence of TMD.

Negative affectivity and emotions in youths with temporomandibular disorders across cultures

ABSTRACT Objective The relationships between temporomandibular disorders (TMDs) and negative affectivity/emotions across cultures and the emotional predictors for TMDs in Southeast Asian youths were investigated. Methods The presence of TMDs and negative affectivity/emotions were determined with the Fonseca Anamnestic Index (FAI) and Depression, Anxiety, Stress Scales-21 (DASS-21). Statistical evaluations were done with non-parametric and logistic regression analyses (α Results The total sample comprised 400 Singaporean and 501 Indonesian youths (mean age 19.30 ± 1.48 years; 65.0% women) of whom 47.0% and 59.3% had mild-to-severe TMDs, respectively. For both cultures, participants with TMDs had significantly greater negative affectivity, depression, anxiety, and stress than those with no TMDs. Indonesian youths also presented higher levels of emotional distress than their Singaporean counterparts. Correlations between FAI and anxiety/stress scores were moderately strong. Conclusion Cultural variations can influence the expression of TMDs and emotional distress. Being female and anxious increased the risk of TMDs.

Otoneurological assessment and quality of life of individuals with complaints of dizziness and temporomandibular disorders: a case-control study

ObjectivesTo evaluate the impact of temporomandibular disorders on the quality of life of patients with dizziness. MethodsAn observational, case-control study evaluated 60 individuals with dizziness (20 cases and 40 controls), who were matched for gender and age. The individuals underwent to anamnesis, overall physical and otoneurological examination, tonal and vocal audiometry and impedanciometry, video head impulse test and the dizziness handicap inventory questionnaire. ResultsThe otoscopy was normal for all patients. There was an association between the presence of temporomandibular disorders and aural fullness (p < 0.01) and otalgia (p < 0.01). Audiometry was normal in 90% of the patients in the case group, with a significant association between temporomandibular disorders and normal audiometry (p < 0.01). The video head impulse test findings were normal in 66% of the patients in the case group and 45% of the control group, and there was no association between having temporomandibular disorders and vestibular alterations at the video head impulse test (p = 0.12). There were significant differences in total dizziness handicap inventory and in the functional and emotional domains (p < 0.01), with higher scores in the control group. ConclusionAural fullness and otalgia symptoms are associated with temporomandibular disorders in patients with dizziness, and there is an association between normal complementary audiological tests and temporomandibular disorders. Vestibular alterations are not associated with temporomandibular disorders. However, patients with dizziness and without temporomandibular disorders showed greater quality of life impairment. Level of evidence3. Original case-control study.

Correlation between temporomandibular disorders and malocclusions: A retrospective observational study-can malocclusions or previous orthodontic treatments affect Temporo-Mandibular Disorders?

Background: The purpose of this article is to verify the possible correlation between TMD (Temporomandibular Disorders) and different types of malocclusions in adult subjects and subsequently that between TMD and previous orthodontic treatment. Materials and methods: A retrospective observational study was conducted in San Paolo e Carlo Hospital, associates of the University of Milan, for a period of 2 years (1st February 2019 – 3rd March 2020), on 374 adult patients (244 females and 130 males). The subjects underwent an intraoral examination with a gnathological assessment, in order to distinguish those who suffered from TMD and those who did not. Secondly, the patients were subjected to orthodontic examination to identify those who had previously undergone orthodontic treatment, assessing through an extraoral and intraoral examination, the dental class, the type of dental bite and the presence or absence of a midline deviation. Results: The data analysis revealed a statistically significant association between TMD and gender (p= 0.023, OR= 1.66). The association between class I, II, III malocclusions and the presence of TMD was found to be statistically significant: p&lt;0.0001 (OR= 4.04) and that between open/deep bite and the presence of TMD too: p= 0.003 (OR= 1.89). Moreover, the correlation between midline deviation and the presence of TMD was statistically significant: p&lt;0.0001 (OR=7.48). On the other hand, no correlation was found between TMD and previous orthodontic treatment (p= 0.918). Conclusions: The available data revealed a statistically significant association between TMD and malocclusions, related to dental class and bite and midline deviation, although the existing results in the literature are controversial regarding this association. While no statistically significant correlation was found between TMD and previous orthodontic treatment. Orthodontic therapy, therefore, by correcting occlusion anomalies, could reduce the risk of TMD incidence. Finally, longitudinal studies with adequate statistical power are needed to clarify the possible interrelationships between TMD and malocclusions.