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This review summarises the articles relating to the temporomandibular joint (TMJ) that were published in the British Journal of Oral and Maxillofacial Surgery (BJOMS) between January 2011 and December 2012. In total 24 papers were published. Of these, 16 (67%) were full-length articles, which included prospective, retrospective, and laboratory-based studies as well as reviews. The remaining 8 papers were short communications, technical notes, and letters to the editor, which report on, amongst other things, unusual cases, rare complications, and novel surgical techniques., (Copyright © 2013 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.)

This review summarises the 81 papers relating to oral surgery and to the temporomandibular joint (TMJ) published in the British Journal of Oral and Maxillofacial Surgery (BJOMS) January 2008-December 2009. They include full length articles on distraction osteogenesis, imaging, extraction techniques, implants, and the management of facial pain and disorders of the TMJ including joint replacement. Many short communications were also published, but an editorial decision was taken in August 2009 to publish most of these in future in the online journal only. As BJOMS encompasses the whole remit of the specialty, and other specialist journals on oral surgery are available, it was encouraging to see that authors still choose submit their work to our journal., (Copyright © 2010 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.)

Various imaging techniques for the temporomandibular joint are discussed with respect to uses, strengths, and limitations. An imaging protocol is outlined for evaluating patients with a wide variety of temporomandibular joint related signs and symptoms.

The articulatory system comprises the temporomandibular joints (TMJs), intra-articular discs, mandibular/jaw muscles and occlusion. In the simplest terms, the TMJ is the articulation between the upper and lower jaws. The teeth form the contacts between the upper and lower jaws and the muscles are the motors that move the mandible. This system is unique in that the TMJs are paired; any stimulus that affects one joint or any other single part of the articulatory system can have a 'knock-on effect' in the rest of the system.It is important to have a good understanding of anatomy, not only to be able to differentiate between what is physiological and what is pathological, but also to understand the objectives of some treatment options. Sound knowledge of anatomy is essential and an appreciation of the anatomical features associated with the TMJ can serve as a foundation for understanding the clinical management of temporomandibular disorders.This article reviews the functional anatomical features of the articulatory system with a look at the clinical significance of this anatomy., (© 2022. The Author(s), under exclusive licence to the British Dental Association.)

Overlooked connections among various neurological functions can potentially yield valuable clinical assessment tools. In this paper, several such connections are explored, including relationships between vibration sense and balance, visual midline and temporomandibular joint function, and temporosphenoidal line indicators and temporalis muscle contraction. Here I present several additional 'clinical tricks' that better isolate the segments and tissues I am assessing. [ABSTRACT FROM AUTHOR]

Introduction: Evaluation of the temporomandibular joint (TMJ) pathologies with cone-beam computed tomography (CBCT) provides essential information about the bone structures of the TMJ. It is important to know the normal reference range when defining these pathologies. The aim of this study is to examine the morphometric and morphologic analyses of the bone structures of TMJ on the CBCT images in detail according to age, gender, and joint side., Material and Methods: A total of 35 parameters related to the condylar process, articular tubercle, mandibular fossa, ramus of mandible, and joint space were examined on the CBCT images. These parameters were compared with the joint sides and gender, and correlated with age., Results: Thirty-five parameters were evaluated. A statistically significant difference was found between genders in 22 parameters and joint sides in 6 parameters. When the correlation of parameters with age was examined; it was found that there was a very weak positive relationship in nine parameters, a weak positive relationship in one parameter, and a very weak relationship in the negative direction in two parameters., Conclusion: In this study, the condylar process, articular tubercle, mandibular fossa, ramus of mandible, and joint spaces, which are usually examined separately in the literature, were examined, and the normal reference range was determined for all these parameters. We think that these normal reference ranges will be useful for researchers interested in TMJ pathologies.

The understandings of motional regular and dynamic information during the mandibular motions are essential to investigate the dysfunctions of temporomandibular joints (TMJ). This study aims to develop a method to record the mandibular movements and analyze the condylar trajectory, velocity, and acceleration in asymptomatic individuals during mandibular motions. Thirteen asymptomatic subjects were strictly selected without symptoms of temporomandibular disorders (TMDs). An optical tracking system was chosen for recording mandibular motions. Curve fitting was used for fitting the trajectories of condyles, notches and lower incisor, and the articular eminence outlines. The sagittal plane (YoZ) provided a better view for condylar trajectories during mouth opening and mandibular protrusion, whereas the coronal plane (XoZ) offered a superior view during lateral protrusions. A parabola had good performance in fitting the trajectories of the condyle, incisor, and outlines with a superior goodness of fit (r 2 ) during mouth opening and mandibular protrusion; linear functions were suitable for fitting the trajectories of the contralateral condyle during lateral protrusions. The velocity during the opening process was lower than that during the closing process, and so were the accelerations. The sagittal space between the articular eminences and condyles during mouth opening and mandibular protrusion were close, 2.8 and 2.7 mm, respectively. The sagittal space, velocity, and acceleration can provide dynamic information of TMJs. Three-dimensional motion analyses of temporomandibular joints during the mandibular motions were conducted to exact the mathematic information of temporomandibular joints. From curve fitting process, the fluctuation can be eliminated and the dynamic information can be obtained. And the parabola was better for the condylar trajectories in the sagittal plane of opening and mandibular protrusion. As to the lateral protrusions, the linear function is suitable for the condylar trajectories in coronal plane. The condylar curve of asymptomatic subjects can set as a reference to diagnose and treat for the patients with associated dysfunctions.

Background: Degenerative changes in the temporomandibular joint might be associated with ageing and/or with the loss of occlusal support., Objective: The aim of the study was to evaluate whether the inclination of the posterior slope of the articular eminence changes in association with: (i) ageing in patients with maintained occlusal support zones (OSZs); and (ii) the loss of OSZs in elders., Methods: In this retrospective radiological study, selected orthopantomograms were allocated into the following groups: I-age 18-35, maintained OSZs, II-age 36-60, maintained OSZs, III-age >60, at least one OSZ per side maintained, IV-age >60, loss of all OSZs. The inclination of the articular eminence was measured relative to the Frankfort plane., Results: The mean values of the inclination of the slope of the articular eminence amounted 34.05° ± 5.17°, 36.68° ± 5.65°, 34.86° ± 6.26° and 26.31° ± 5.12° for group I, II, III and IV respectively. There were no significant differences between the groups I to III. Group IV differed significantly from each of the previous groups., Conclusions: Flattening of the articular eminence is associated with the loss of OSZs rather than ageing., (© 2019 Australian Dental Association.)

Background: Occlusion is dynamic and plays an important role in the functioning of the stomatognathic system. Disturbance in one of the components of the stomatognathic system may result in hypersensitivity of teeth, orofacial pain, migraine, and temporomandibular joint (TMJ) disorders. Coronoplasty done using articulating paper is the conventional method for occlusal corrections. T‑scan is a computerized occlusal analysis system that overcomes the limitations of articulating paper. Methods: Patients with Myofacial pain dysfunction syndrome (MPDS) having dentinal hypersensitivity were taken into consideration. The case series included three cases. A joint vibratory analysis (JVA) is performed using a JVA device to rule out any TMJ disorders. T‑scan‑assisted coronoplasty is performed. Patients are asked to score for dentinal hypersensitivity on the VAS scale pre and postoperative. Results: Occlusion and disocclusion time is reduced along with hyperactivity of the muscles after T‑scan‑assisted coronoplasty. There is a reduction in dentinal hypersensitivity postoperative. Conclusion: T‑scan quantifies the forces and hence proved a boon in the field of dentistry. The present case series highlights coronoplasty assisted with a T‑scan for diagnosis and treatment planning of hypersensitivity of teeth; hence it is the future of dentistry. Practical Implications: T‑scan is a device that is assisted with electromyography. It projects the forces of mastication at every contact point of maxillary and mandibular teeth and reveals muscular hyperactivity. It can be used in MPDS patients with dental hypersensitivity due to occlusal discrepancy as it can guide elective coronoplasty relieving pain and dentinal hypersensitivity. [ABSTRACT FROM AUTHOR]

Surface electromyography (sEMG) is a technique for measuring and analyzing the electrical signals of muscle activity using electrodes placed on the skin's surface. The aim of this paper was to outline the history of the development and use of surface electromyography in dentistry, to show where research and technical solutions relating to surface electromyography currently lie, and to make recommendations for further research. sEMG is a diagnostic technique that has found significant application in dentistry. The historical section discusses the evolution of sEMG methods and equipment, highlighting how technological advances have influenced the accuracy and applicability of this method in dentistry. The need for standardization of musculoskeletal testing methodology is highlighted and the needed increased technical capabilities of sEMG equipment and the ability to specify parameters (e.g., sampling rates, bandwidth). A higher sampling rate (the recommended may be 2000 Hz or higher in masticatory muscles) allows more accurate recording of changes in the signal, which is essential for accurate analysis of muscle function. Bandwidth is one of the key parameters in sEMG research. Bandwidth determines the range of frequencies effectively recorded by the sEMG system (the recommended frequency limits are usually between 20 Hz and 500 Hz in masticatory muscles). In addition, the increased technical capabilities of sEMG equipment and the ability to specify electromyographic parameters demonstrate the need for a detailed description of selected parameters in the methodological section. This is necessary to maintain the reproducibility of sEMG testing. More high-quality clinical trials are needed in the future. [ABSTRACT FROM AUTHOR]

Background: Mechanical response analysis of the temporomandibular joint (TMJ) is crucial for understanding the occurrence and development of diseases. However, the realistic modeling of the TMJ remains challenging because of its complex composition and multivariate associations., Objective: This study aims to develop a highly realistic stomatognathic model that accurately represents the geometric accuracy, structural integrity, and material properties. And further optimizes the interference and establishes the application range of the simplifications and the assumptions., Methods: Geometric reconstruction of the bone was based on high-resolution image data, with the accuracy of the occlusal surface ensured by plaster cast model registration. Soft tissues such as cartilage, the disc, the periodontal ligament (PDL), and disc attachments often need to be approximated or assumed. Therefore, the finite element methods (FEM) was used to optimize these assumptions, including 1) the biomechanical effects of the thickness and modulus of the PDL, 2) the approximation of the geometry and material behavior of the disc, and 3) the simplification of the loading and boundary conditions., Results: 1) The deformation of the PDL causes tooth movement, which spreads to the distal condyle and further effects the TMJ load situation, 2) Disc reconstructed by MRI and hyperelastic material behavior are necessary for accurate TMJ loading analyses, 3) The loss of relative sliding movement between teeth interferes with realistic TMJ loading., Conclusion: The improved stomatognathic model delivers highly realistic and validated simulation, offering theoretical guidance for virtual treatments and TMJ multivariate overload studies., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Background: Pain intensity after temporomandibular joint (TMJ) surgery is often underestimated, and inadequate pain control may relate to poor recovery quality, increased opioid consumption, and longer hospital stay. This trial aims to evaluate whether non-opiate anesthesia provides a promising option of pain management for patients undergoing TMJ surgery., Methods: Sixty patients receiving TMJ surgery were randomly assigned to either the control group or the non-opiate group. Non-opiate anesthesia used lidocaine, dexmedetomidine, and ketamine infusion therapy for pain management. The primary outcome was the highest documented pain score while in the post-anesthesia care unit (PACU). Secondary outcomes included perioperative opioid consumption, utilization, dosage, and timing of rescue analgesia in the PACU, incidence of postoperative nausea and vomiting in the PACU and at home, pain satisfaction levels, occurrence of opioid-related adverse effects, duration of PACU and hospital stays, and total consumption of oxycodone-acetaminophen tablets at 24 and 48 hours post-surgery., Results: Patients were predominantly female (88.3%) and had a median age of 37.5 [IQR 26.0, 52.5] years. There were no significant differences observed in the highest documented pain scores (mean difference [MD] -0.36 points, 95% CI: -1.84, 1.12, p = 0.63), postoperative oxycodone-acetaminophen consumption (MD 6.68 mg, 95% CI: -2.48, 15.84, p = 0.15), pain satisfaction (odds ratio [OR] 0.81, 95% CI: 0.23, 2.81, p = 0.74), time to PACU discharge (hazard ratio [HR] 1.24, 95% CI: 0.67, 2.30, p = 0.49) or time to hospital discharge (HR 1.48, 95% CI: 0.80, 2.75, p = 0.21) between the two groups. Similarly, no significant difference was observed in time to rescue analgesia, calculated in minutes from the end of surgery (HR 1.69, 95% CI: 0.79, 3.61, p = 0.18)., Conclusion: Non-opiate anesthesia for pain management shows a similar postoperative analgesia effect, compared to opioid-based anesthesia, in patients undergoing arthroscopic TMJ surgery., Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (© 2024 Ma et al.)

As ear-related technologies proliferate, optimizing comfort, retention, and battery life is crucial for enhancing user experience. A thorough understanding of the anatomical interaction between the temporomandibular joint (TMJ) and the earcanal during mouth-opening is essential. This study develops a finite element model and an experimental setup to investigate the biomechanical coupling between the TMJ and the earcanal. We analyze reverse-static deformations, focusing on cartilage-bone junction geometry, mandibular condyle location, and concha mobility. The earcanal geometry is assessed across five cross-sections with seven key dimensions measured. The results indicate that the deformations in cantilever-beam-like models closely match the reference geometry in both approaches, particularly in the lateral region. These findings suggest that a dynamic motion model of the earcanal, accurately simulating its behavior, is feasible., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

To search for the best available scientific evidence in relation to the reported overall and selective complication rates for arthroscopic surgery in patients presenting with internal derangement (ID) of the temporomandibular joint (TMJ). A comprehensive electronic search was conducted without data or language restrictions up to August 2023. Inclusion criteria were the following: study in humans, randomized or quasi-randomized controlled trials (RCTs), controlled clinical trials (CCTs), cohort studies and series of clinical cases. The proposed PICOS question was: "In clinical trials and retrospective clinical series of patients treated by arthroscopy, which were the overall and selective complication rates?" Exclusion criteria were animal studies, review papers, technical reports, and in vitro studies. The Cochrane Collaboration Tool was used to assess the risk of bias of the included studies in terms of their quality. The Strength of Recommendation Taxonomy (SORT) classification was used to determine the level of evidence of the selected studies. A total of 498 studies were identified. Of these, 16 studies fulfilled the inclusion criteria and were selected for qualitative assessment. Temporary 5th nerve deficit, ranging from 0.15% to 2.38%, was reported to occur in most larger series, comprising 7394 operated joints. Temporary 7th nerve paresis was reported to occur in 0.21%-0.7% in the largest series, comprising 6866 operated joints. Partial hearing loss was reported in 6 studies, ranging from 0.21% to 2.2% in 5845 operated joints. Edema of surrounding soft tissues, including parapharyngeal, soft palate and/or preauricular edema was reported in 8 studies, with complication rates ranging from 2% to 17.9% in 2274 operated joints. Laceration of the EAC was reported in 8 studies involving 2665 operated joints, with complication rates ranging from 0.3% to 6%. A total of 872 complicated events among 11,304 operated joints were reported, accounting for an overall complication rate of 7.71%. Complications from arthroscopic procedures have been inconsistently reported, but there are a small number of retrospective studies with well-reported complications rates. As overall complication rate accounts for less than 8% of the cases, arthroscopy seems to be a highly safe procedure for the treatment of internal derangement (ID) of the TMJ. Due to the absence of studies with high evidence, information for patients about complications should be based on clinical series of cases., Competing Interests: Declaration of competing interest There are no disclosures that might pose a potential, perceived or real conflict of interest., (Copyright © 2024 European Association for Cranio-Maxillo-Facial Surgery. Published by Elsevier Ltd. All rights reserved.)

The article focuses on how to take occlusal readings in dentistry. It is stated that accurate evaluation is important in full mouth rehabilitation, and also in Class I occlusal amalgam restorations. It is mentioned that inability to get correct occlusal adjustment can result in occlusal trauma, which can lead to dental pain, muscle spasms, and temporomandibular joint (TMJ) problems. There are three methods of obtaining occlusal readings: Articulating paper, Articulating film, and Memory photocclusion wafer. In the articulating paper method, a full arch articulating paper is inserted between the teeth of a patient, and in the articulating film method, an articulating film is used.

Background The aim of the present study was to analyse the influence of temporomandibular disorder (TMD) on electromyographic activity in the masseter and temporal muscles of adolescents and investigate a possible association with the number of occlusal contacts. Methods The Helkimo Index was administered for the diagnosis of TMD and classification of the adolescents into three groups: without TMD; with mild TMD; and with moderate/severe TMD. Carbon paper was used for the determination of occlusal contact points. A standardised electromyographic evaluation was performed on the masticatory muscles at rest, during habitual chewing and during maximum voluntary clenching. The readings were normalised to maximum voluntary clenching. Statistical analysis involved the chi-squared test and Fisher's exact test. The Kruskal-Wallis test and one-way analysis of variance with Dunn's post hoc test were used to compare differences between groups. Pearson's correlation coefficients (r) were calculated for the determination of correlations between the number of occlusal contacts and RMS values. Results Electromyography revealed significant differences in the right and left masseter and temporal muscles at rest and during chewing among the three groups. These differences were not observed during maximum voluntary clenching. No statistically significant differences were found between the groups with and without TMD regarding the number of occlusal contacts. Conclusion Electromyographic activity in the masseter and temporal muscles was greater among adolescents with moderate to severe TMD. [ABSTRACT FROM AUTHOR]

Purpose: The study aims to analyse the effects of condylar rotation on the biomechanical environment of the TMJ after bilateral sagittal split ramus osteotomy (BSSRO) through the finite element method (FEM)., Methods: Thirteen patients with mandibular prognathism and twenty-three normal subjects were recruited. The three-dimensional (3D) models were reconstructed. 13 representative morphological parameters were measured for comparison. A patient was selected to perform virtual BSSRO surgery by rotating the condyles in MIMICS. The preoperative and postoperative 3D models of the patient were subsequently imported into ABAQUS for finite element analysis. The preoperative and postoperative stresses and joint spaces in the TMJs were investigated., Results: The maxillofacial morphologies of the patients with mandibular protrusion was significantly different from those of the asymptomatic subjects (P<.05). Stresses in the postoperative group were lower than those in the preoperative group. The rotation of the condyle could cause the variations in stress levels and joint spaces within the TMJs. Inward and upward rotation of the condyle was associated with higher stress in the TMJ, whereas the lowest stress was observed when the condyle remained stationary following surgical intervention., Significance: Lateral, medial and superior joint spaces were more related to the stresses in the TMJs. The condyle should be kept in place as much as possible to avoid disrupting the balance of the TMJ in patients with mandibular protrusion., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Masson SAS. All rights reserved.)

The aim of this paper was to determine the optimal needle depth for temporomandibular joint (TMJ) arthrocentesis using magnetic resonance imaging (MRI), with the aim of improving procedural safety and efficacy in clinical practice. A retrospective analysis of 264 TMJ MRIs from 132 patients at Istanbul Medipol Mega University Hospital was conducted. T2-weighted MRI sequences were utilised to measure distances from skin to joint capsules at varying needle entry points, applying the double puncture technique. The study adhered to ethical standards with appropriate approvals. The analysis revealed significant gender-related variations in needle depths (females showing shorter distances than males, p < 0.05). No significant gender differences were found in condylar angles. An inverse correlation between age and condylar angle suggested age-related anatomical changes. Crucially, a 20 mm needle depth was identified as safer and more effective than the previously recommended 25 mm. This study underscores the necessity of revising needle depth to 20 mm in TMJ arthrocentesis. These findings hold significant implications for improving procedural safety and catering to demographic variations., (Copyright © 2024 The British Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.)

There is a close physiological connection between swallowing and the temporomandibular joint (TMJ). However, a shortage of quantitative research on the biomechanical behavior of the TMJ during swallowing exists. The purpose of this study was to reconstruct the movement of the temporomandibular joint (TMJ) based on in vivo experiment and analyze the biomechanical responses during swallowing in healthy adults to investigate the role of the TMJ in swallowing. Motion capture of swallowing, computed tomography (CT), and magnet resonance images (MRI) were performed on six healthy subjects. The movements of the TMJ during swallowing were reconstructed from the motion capture data. The three-dimensional finite element model was constructed. The dynamic finite element analysis of the swallowing process was performed based on the motion data. The range of condylar displacement was within 1 mm in all subjects. The left and right condyle movements were asymmetrical in two-thirds of the subjects. The peak stresses of the discs were relatively low, with a maximum of 0.11 MPa. During swallowing, the condylar displacement showed two trends: slow retraction and slow extension. The tendency to extend could lead to a gradual increase in stress on the disc., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 IPEM. Published by Elsevier Ltd. All rights reserved.)

Alterations in occlusal features may have significant consequences, ranging from dental aesthetics to health issues. Temporomandibular joint disorders (TMDs) are often associated with joint overload, and the correlation between occlusal features and TMDs has been thoroughly discussed. In current work, we introduced a novel stomatognathic model that aligns well with in vivo experimental measurements, specifically designed to decouple the impact of occlusal contact and periodontal ligament (PDL) negative feedback on temporomandibular joint (TMJ) loading. Utilizing an in-silico approach, the simulation analysis included six symmetric occlusal contact scenarios. Furthermore, a biomechanical lever model was employed to clarify the mechanical mechanism and investigate the multi-factorial effects of TMJ overload. These findings indicate that anterior shifts in the occlusal centre lead to increased TMJ loading, particularly in occlusal contact cases with anteroposterior changes. Considering the symmetrical distribution of occlusal contact, mediolateral alterations had a more modest effect on TMJ loading. Additionally, potential negative feedback activated by principal strain of periodontal could not only alleviate joint load but also diminish occlusal force. These investigations enhance our understanding of the intricate interactions between masticatory muscles, occlusal forces, and joint contact forces, thereby providing motivation for future comprehensive studies on TMJ biomechanical overload., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Patients with psychiatric problems show a tendency to develop temporomandibular disorders (TMD). Particularly, patients with schizophrenia are quite likely to have signs and symptoms of TMD due to the impairment of their oral health, the use of antipsychotic drugs, and other general health problems. In nonschizophrenic populations, TMD have been considered as the main cause of nondental pain in the orofacial region, involving mechanisms associated with changes in masticatory activity at the cortical and neuromuscular levels. Individuals with schizophrenia do not usually complain of pain, and TMD is misdiagnosed in this population. In this paper, we aimed to review the clinical aspects of TMD in people with schizophrenia on antipsychotic drug therapy. [ABSTRACT FROM AUTHOR]

Information about several papers presented at the Second European Meeting of the International Association for Dental Research (IADR) is provided. The article discusses the Craniofacial Biography Group of the IADR and its research. Topics discussed in the papers include dental development, the temporomandibular joint, and muscular strength.

Background: The temporomandibular joint (TMJ) is a complex joint that facilitates mandibular movements during speech, chewing, and swallowing activities. The Axis I evaluation of the DC/TMD focuses on assessing physical diagnoses related to TMDs. It includes an assessment of pain and functional limitations, such as jaw opening range, joint sounds, and joint tenderness. The Axis II evaluation of the DC/TMD provides information on the patient's psychological status and quality of life. This Systematic Review with Meta-Analysis aimed to evaluate the accuracy of Temporomandibular Disorders diagnosis considered through the Diagnostic Criteria for Temporomandibular Disorder (DC/TDM) axis II compared to the Axis I evaluations. Methods: A search was made in PubMed, Web of Science and Lilacs for articles published from the inception until 20 January 2023. We applied the Population, Exposure, Comparator, and Outcomes (PECO) model [1] to assess document eligibility. Only studies that evaluated patients by DC/TMD Axis I and Axis II were considered. Review Manager version 5.2.8 (Cochrane Collaboration) was used for the pooled analysis. We measured the odds ratio (OR) between the two groups (Axis I and Axis II). Results: Fifty-one articles were selected because of the search. Four papers were excluded before the screening: 2 pieces were not in English, and two were reviewed. The remaining 47 articles were selected for the title and abstract screening to evaluate whether they met the PECO criteria. Among these, four papers were established; the overall effect showed that there was no difference in TMD diagnosis between Axis I and Axis II (RR 1.17; 95% CI: 0.80– 1.71; Z:0.82; P =.41), suggesting that there is no difference between Axis I and Axis II. Conclusion: In conclusion, DC/TMD is an effective tool for the diagnosis of TMD. It improves the accuracy of TMD diagnosis, allows for the classification of subtypes, and assesses psychosocial factors that may impact the development or maintenance of TMD symptoms. [ABSTRACT FROM AUTHOR]

Temporomandibular joint ankylosis is an important entity that dentists and maxillofacial surgeons should know about. It clinically manifests through a permanent limitation of mandibular movements coupled with mouth opening inferior to 3 cm. This serious pathology can have serious functional repercussions, such as mastication problems, speech troubles, eating disorders, and jaw growth hindrance, in addition to the psychological difficulties in coping with such a condition in daily life. Herein, we present a radiological and chronological illustration of the evolution of temporomandibular joint ankylosis following an overlooked traumatic fracture of the mandibular condyle. The present case report involves an 8-year-old patient referred for a gradually evolving mouth opening limitation following a car accident. Tomodensitometry was helpful as it revealed an osseous block between the left temporomandibular joint surfaces, showing an ankylosis. Posttraumatic cerebral computed tomography scan was performed. It revealed an undetected fracture of the left condyle. The aim of this paper was to show how a traumatic ankylosis could have been avoided if enough attention was paid to the interpretation of immediate posttraumatic computed tomography scans. A thorough dental examination must be carried out once vital emergency is over. Early diagnosis of temporomandibular joint trauma is a crucial factor in preventing complications, such as ankylosis and its consequent oral dysfunctions. The dentist must automatically suspect condylar fracture when a child presents a history of head trauma, especially a mandibular trauma. This case should be a reminder that although temporomandibular joints are very often left out in patients' vital emergency first examination, temporomandibular joints/they are still a highly important structure which omission, and thus, dysfunction, if lesions are present, can lead to nonnegligible medico-legal consequences/that temporomandibular joints should be taken into account during patients' vital emergency first examination because if they are neglected, in the presence of lesions, they cause dysfunction, thus leading to nonnegligible medico-legal consequences. [ABSTRACT FROM AUTHOR]

Numerous authors and textbooks have advocated the concept of bilateral simultaneous occlusal contacts as one of the necessary components of an optimum occlusal condition. All occluding surfaces should meet at the same moment of time during a mandibular closure. Articulating paper labeling that appeared widely distributed throughout the arch was thought to represent this advocated occlusal condition. However, computerized occlusal analysis shows that true bilateral occlusal contact time simultaneity is not accurately represented by widespread paper labeling. Articulating paper labeling is an inadequate indicator of perceived occlusal contact time simultaneity as it renders no occlusal contact force or time sequencing. When occlusal adjustments are guided by computerized occlusal analysis, occlusal contacts on all potentially occluding teeth can be approximated to occur within .2 second. This technique report describes a clinical procedure that employs computerized occlusal analysis to guide sequential occusal adjustments to obtain measurable bilateral occlusal contact simultaneity. Additionally, the phenomenon of how articulator paper labeling can be a misleading indicator of occlusal contact timing and force content is presented. [ABSTRACT FROM AUTHOR]

Purpose: Temporomandibular joint (TMJ) surgery is being increasingly performed globally with considerable success leading to improved quality of life for patients affected with disabling temporomandibular disorders. One of the most unusual phenomena noted during maxillofacial surgery due to stimulation of the trigeminal nerves is the Trigeminocardiac reflex (TCR), which causes sudden bradycardia and hypotension causing alarm and distress to the surgical and anesthetic team. The purpose of this systematic review is to identify the frequency and discuss the pathophysiology of the TCR especially during TMJ surgery., Methods: The authors performed a systematic review by searching PubMed, Embase, Ovid, and Cochrane databases between 1946 and 2023 to identify studies that reported on the development of TCR during TMJ surgery. Non-English publications and those with inadequate details were excluded., Results: Thirty-six papers reporting on the development of the TCR during oral and maxillofacial procedures were noted. Six papers reported specifically on TCR during TMJ surgery. A total of 25 subjects developed TCR during TMJ surgery. The mean age of the subjects was 31 (standard deviation 17.16) years. Twenty-three subjects (92%) developed bradycardia while 2 subjects (8%) developed asystole. All subjects recovered. The most common stimulant noted in these papers leading to TCR was manipulation and distraction of the TMJ., Conclusion: Although TCR is uncommon, it can occur during TMJ surgery, and it behooves the surgeon and anesthesia team to be aware of the potential for TCR to ensure adequate and timely treatment., (Crown Copyright © 2024. Published by Elsevier Inc. All rights reserved.)

Background: Anterior displacement of the temporomandibular joint (TMJ) disc is the most typical pathological condition of TMJ disorders. Structures attached to the articular disc may support the disc in various directions and contribute to stabilizing the TMJ. However, the relationship between the articular disc, capsule, and masticatory muscles remains unclear. Therefore, this study aimed to clarify the relationship between the masticatory muscles, related masticatory fascia, articular disc, and capsule., Methods: We examined 10 halves from adult Japanese cadavers, with five halves macroscopically analyzed and the remaining five histologically analyzed. The TMJ was dissected from the lateral aspect for gross anatomical analysis. For histological analysis, the relationship between the temporal and masseteric fasciae and the articular capsule was observed in the coronal section. Additionally, we evaluated relationships among the disc, capsule, temporal fascia, and masseteric fascia in 10 living and healthy volunteers using magnetic resonance imaging., Results: The articular disc was attached to the capsule without a clear border. The capsule continued into the masseteric and temporal fasciae. Consequently, the articular disc, capsule, masseteric, and temporal fasciae were considered a single complex., Conclusions: The single complex of the temporalis, masseter, capsule, masticatory fascia, and disc may antagonize the force in the posterolateral direction through the fascia., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier GmbH. All rights reserved.)

The correlation between magnetic resonance imaging (MRI) signs and clinical findings has been highlighted in multiple studies. However, very little information is available on the correlation between the bilateral temporomandibular joints (TMJs) of the same individual. The majority of efforts in the clinical research setting have focused on the correlation between ipsilateral imaging and clinical findings, while less attention has been paid to the contralateral imaging findings of the anatomical structures.The objective of this paper was to review the existing literature that compares temporomandibular joint (TMJ) magnetic resonance imaging (MRI) findings from both sides of the same individual.In January 2024, a systematic search of the literature from major search engines (MEDLINE (PubMed), Scopus) was conducted to identify all peer-reviewed English-language studies that presented an MRI comparison of left and right TMJ data in the same patients. The articles were analyzed using a Population/ Intervention/Comparison/Outcome (PICO) format.The search terms "temporomandibular joint" AND "magnetic" AND "resonance" yielded 2,561 results. Only 2 papers met the established inclusion criteria. The results of the papers included in the systematic review were not comparable due to differences in the evaluation of the TMJs, which prevented a meta-analysis. Manfredini et al. identified a statistical correlation between disc displacement, osseous changes (OC) and joint effusion (JE) between the joints of the contralateral sides. Koca et al. observed a significant difference in TMJ MRI findings between the painful and non-painful sides of each individual in a bruxism group and a control group (p = 0.001, p < 0.001 and p = 0.004, p < 0.001, respectively).The studies on the correlation between the right and left TMJs remain scarce. A comparative analysis of the 2 sides of the TMJ in individual patients is rarely reported.The review did not identify a common result for the findings of the contralateral TMJs in the 2 articles included.

Objectives: To evaluate dynamic condylar positions by integrating mandibular movement recording data and cone-beam computed tomography (CBCT) and to investigate its accuracy via dynamic model experiments., Methods: A polyvinyl chloride skull model was utilized. A robot arm was used to operate the mandible to perform mouth opening, closing, protrusion, and lateral movements. A recording device, worn on the skull, was used to record the dynamic process and an optical position tracking (OPT) system was used to simultaneously trace the movements. A self-developed software module was used to evaluate the dynamic condylar position by integrating the dynamic tracing data and a virtual skull model derived from CBCT images. Errors were defined as differences between the dynamic coordinates of six landmarks around the condylar area derived from the software module (test) and OPT system (gold standard)., Results: The condylar position errors were 0.76 ± 0.31, 0.55 ± 0.15, and 0.68 ± 0.23 mm for mouth opening, bilateral, and protrusion movements, respectively. Furthermore, the errors for small, moderate, and large mouth opening movements were 0.62 ± 0.19, 0.69 ± 0.29, and 0.94 ± 0.31 mm, respectively. The errors for all movements, except for large mouth opening, were significantly less than 1 mm (P < 0.05). The error was not different from 1 mm in the large mouth opening movement (P > 0.05)., Conclusions: Our developed method of achieving dynamic condylar position by integrating mandibular movement recording data and CBCT images is clinically reliable., Clinical Significance: This study proved the reliability of evaluating dynamic condylar position using a commercial dynamic recording instrument and CBCT images., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Background: The reduction in joint load is a potential beneficial factor in managing osteoarthritis of the temporomandibular joint (TMJ). This paper aims to compare the effectiveness of the intramuscular injection of botulinum toxin (BTX-A) as an adjunct to TMJ arthrocentesis plus viscosupplementation with arthrocentesis plus viscosupplementation alone in the management of TMJ osteoarthritis. Methods: A pilot clinical retrospective study examined TMJ osteoarthritis treatments. Patients were divided into two groups: Group A received BTX-A injections and arthrocentesis with viscosupplementation, while Group B received only arthrocentesis with viscosupplementation. The study assessed outcomes based on mouth opening (MO), pain at rest (PR), pain at mastication (PF), and masticatory efficiency (ME) at various time points (baseline (T0), 1 week (T1), 2 weeks (T2), 3 weeks (T3), and 4 weeks (T4)) up to 2 months after treatment. Results: The study included two groups, each with five patients. Group A received five weekly sessions of arthrocentesis plus viscosupplementation and a single BTX-A injection during the first arthrocentesis appointment. Group B underwent the five-session protocol of arthrocentesis plus viscosupplementation alone. MO, PF, PR, and ME improved quickly in T2 in both groups, but the improvement was of greater importance over the following weeks and lasted longer in Group A. Conclusions: Arthrocentesis with viscosupplementation associated with BTX-A was found to be more effective than arthrocentesis alone in improving clinical outcomes. This suggests that patients with TMJ osteoarthritis and myofascial pain may benefit from reduced muscle tone and joint load. [ABSTRACT FROM AUTHOR]