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Polycycloidal corrected tomography of the temporomandibular joint.

Historically, radiographic evaluation of the temporomandibular joint has been of limited value. A step-by-step technique which is more correct anatomically is suggested. This technique involves polycycloidal corrected tomography of the temporomandibular joint. Radiographic samples are presented, as well as the results of a random sampling of 300 cases. Fifty-seven percent of the cases showed radiographic changes, and the reasons and limitations of these results are interpreted.

Humans↗

Pathology of temporomandibular joint internal derangement and osteoarthrosis.

Temporomandibular joint (TMJ) osteoarthrosis and disk displacement seem to be strongly related, but they may also represent mutually independent temporomandibular disorders. This paper presents relevant aspects of normal physiology and degeneration of synovial joints, aspects of normal temporomandibular articular disk physiology and of displacement of the disk, the relationship between TMJ osteoarthrosis and disk displacement, and a general classification of temporomandibular disorders.

Cartilage, Articular↗

Tooth wear and temporomandibular joint change in Australian aboriginal populations.

The masticatory system consists of teeth, temporomandibular joints, and the supporting craniofacial skeleton. The form and function of each of these components of the system can be understood only within the overall context of the system. In a series of studies, the complex relationships between tooth wear and temporomandibular joint morphology and pathology were considered in samples consisting of a total of 58 male and 54 female crania from two Australian Aboriginal populations. The extent and buccolingual direction of tooth wear were assessed using established techniques. Both metric and nonmetric descriptions of temporomandibular joint morphology and pathology were developed. Significant differences in patterns of tooth wear and in the frequencies of various temporomandibular joint changes were evident between sexes and between populations. Furthermore, significant correlations between a number of tooth and joint variables were also evident. In addition, there was clear evidence of relationships between both tooth wear and temporomandibular joint changes and craniofacial morphology. The results of this study provide additional evidence of the complex relationships between the form and function of the masticatory system.

Adult↗

Three-dimensional finite-element model of the human temporomandibular joint disc during prolonged clenching.

In the temporomandibular joint (TMJ), overloading induced by prolonged clenching appears to be important in the cascade of events leading to disc displacement. In this study, the effect of disc displacement on joint stresses during prolonged clenching was studied. For this purpose, finite-element models of the TMJ, with and without disc displacement, were used. Muscle forces were used as a loading condition for stress analysis during a time-period of 10 min. The TMJ disc and connective tissue were characterized as a linear viscoelastic material. In the asymptomatic model, large stresses were found in the central and lateral part of the disc through clenching. In the retrodiscal tissue, stress relaxation occurred during the first 2 min of clenching. In the symptomatic model, large stresses were observed in the posterior part of the disc and in the retrodiscal tissue, and the stress level was kept constant through clenching. This indicates that during prolonged clenching the disc functions well in the asymptomatic joint, meanwhile the retrodiscal tissue in the symptomatic joint is subject to excessive stress. As this structure is less suitable for bearing large stresses, tissue damage may occur. In addition, storage of excessive strain energy might lead to breakage of the tissue.

Adult↗

Synovial fluid glycosaminoglycan (acid mucopolysaccharide) analysis in assessment of temporomandibular joint dysfunction. A pilot study.

Temporomandibular joint (TMJ) synovial fluid was aspirated from normal control subjects and patients undergoing surgery for TMJ dysfunction. The glycosaminoglycan (GAG) composition of this fluid was analysed and compared with the clinical diagnosis and histological appearance of the condylar tissues. Changes in GAG composition were observed where a histologically hyperplastic response was seen in joint tissues, but these findings did not necessarily correlate with the initial clinical diagnosis. It is suggested that the fluid composition reflects the current metabolic activities of the tissues and may provide a useful marker of such processes.

Adult↗

[Radiologic examination of the temporomandibular joint. 1. One plane radiographs].

A knowledge of the anatomic form and relationship of the components of the temporomandibular joint is an important factor in the evaluation, diagnosis, and treatment of temporomandibular joint disturbances. Radiographs of the temporomandibular joint in one plane are the simplest, fastest and easiest way to obtain certain information of temporomandibular joint components. Form and location of the temporomandibular joint are the limiting factors, in the radiological examination of this part of the human body. Different techniques for obtaining the optimal one plane radiograph have been developed to solve this problem. Each of these techniques depicts a different part of the joint. Thus, no method is superior to any other, and none is suitable for all situations.

Humans↗

Sideways dislocation of the temporomandibular joint meniscus: the edge sign.

Seventy temporomandibular joint arthrograms of 49 patients with symptoms of internal joint derangement were reviewed. Twenty-three of these arthrograms (33%) were abnormal but atypical for anteriorly dislocated meniscus. The lower temporomandibular joint space had a well-defined edge located inferiorly, which was attributed to pressure from a sideways-dislocated meniscus. We called this appearance the "edge sign." Seven patients with radiologically apparent sideways dislocation were operated on. The meniscus was dislocated laterally in six and medially in one. The incidence of irreducibility and perforation was higher in sideways-dislocated than in anteriorly dislocated menisci.

Adolescent↗

Calcifications of the disc of the temporomandibular joint.

Calcified lesions of the temporomandibular joint discs obtained from 135 human cadavers were studied. Calcifications were observed in 92 of 250 discs by soft x-ray radiography. Studies by light and electron microscopy and x-ray diffraction revealed that there were two different types of calcification in the discs: apatite crystal deposition with or without ossification, and calcium pyrophosphate dehydrate (CPPD) crystal deposition. Calcifications were recognized more frequently posteriorly than anteriorly, and were related to disc perforation. The results of this investigation suggest that disc degeneration, which may occur as a result of aging or mechanical stress, causes calcifications.

Aged↗

[The classification of diseases of the temporomandibular joint].

There were 2040 patients with temporomandibular joint (TMJ) diseases in the investigation including clinical, physiological, X-ray methods of research, contrast arthrotomography, computer arthrotomography and magnetic resonance tomography. The changes of structure in different lesions were estimated. The result of received data was elaboration of classification of TMJ internal derangements with estimation of clinical forms in according with structural changes and characteristics of syndromes.

Arthrography↗

Augmented reality environment for temporomandibular joint motion analysis.

The principles of interventional video tomography were applied for the real-time visualization of temporomandibular joint movements in an augmented reality environment. Anatomic structures were extracted in three dimensions from planar cephalometric radiographic images. The live-image fusion of these graphic anatomic structures with real-time position data of the mandible and the articular fossa was performed with a see-through, head-mounted display and an electromagnetic tracking system. The dynamic fusion of radiographic images of the temporomandibular joint to anatomic temporomandibular joint structures in motion created a new modality for temporomandibular joint motion analysis. The advantages of the method are its ability to accurately examine the motion of the temporomandibular joint in three dimensions without restraining the subject and its ability to simultaneously determine the relationship of the bony temporomandibular joint and supporting structures (ie, occlusion, muscle function, etc) during movement before and after treatment.

Adult↗

[The experience of using a method of radionuclide skeletal visualization in the diagnosis of temporomandibular joint diseases].

The technique was applied in 12 patients with temporomandibular joint dysfunction without X-ray features of arthrosis, and in 7 patients with facial pains of unclear etiology. Radionuclide investigation data compared with clinical and X-ray data, the new technique proved highly sensitive to detect early stages of temporomandibular joint arthrosis and to determine temporomandibular joint involvement in cases of facial pains. This suggests the use of the technique for screening in prosopalgia.

Adult↗

Ear symptoms in temporomandibular joint disturbances.

The symptoms related to temporomandibular joint disturbances in 530 cases are reviewed. A possible anatomical explanation for the middle ear symptoms related to disturbance of the temporomandibular joint is presented.

Headache↗

Differential activation by cytokines of mitogen-activated protein kinases in bovine temporomandibular-joint disc cells.

Temporomandibular disorders affect a significant proportion of the population. While their aetiology is not well defined, recent histological studies suggest that the majority are similar to the osteoarthritis seen in other joints. Inflammatory cytokines such as interleukin-1 and tumour necrosis factor-alpha appear to be important in the cascade of events leading to joint destruction in osteoarthritis. Here, cells from the disc of bovine temporomandibular joint were used to examine the response to various cytokines in vitro. Disc cells were stimulated with interleukin-1alpha, tumour necrosis factor-alpha, transforming growth factor-beta, platelet-derived growth factor, and basic fibroblast growth factor. Their effects were monitored by assessing the phosphorylation of selected signal-transduction intermediates using western blot. Mitogen-activated protein kinases (Erk 1, Erk 2) were rapidly phosphorylated by exposure to basic fibroblast growth factor, platelet-derived growth factor, and tumour necrosis factor-alpha, while interleukin-1alpha showed a weak response. Transforming growth factor-beta failed to activate these kinases. Examination of the effect of these cytokines on p38 (an intermediate in the stress-activated protein-kinase pathway) showed an increase in phosphorylated p38 when stimulated with tumour necrosis factor-alpha and interleukin-1alpha. The amounts of phosphorylated signal transducer and activator of transcription-3 did not significantly increase when the cells were exposed to any of the cytokines.

Animals↗

Herniation of the temporomandibular joint into the external auditory canal: a complication of otologic surgery.

Herniation of the temporomandibular joint into the external auditory canal has been reported as a result of trauma, neoplasia, infection, inflammatory processes, or developmental malformations. This paper reviews the intimate relation of the temporomandibular joint to the temporal bone as well as the literature describing temporomandibular joint herniation into the external auditory canal. Four cases of temporomandibular joint herniation into the external auditory canal resulting from otologic surgery are presented. Their characteristic location, clinical and radiographic findings are described and contrasted to previously reported cases. Despite striking displacement of the temporomandibular joint into the external auditory canal, there were no clinical symptoms referable to this finding. The absence of symptoms distinguished this postoperative etiology of temporomandibular joint herniation from other etiologies mentioned above.

Adult↗

A retrospective analysis of temporomandibular joint reconstruction with free fibula microvascular flap.

OBJECTIVES: The temporomandibular joint is occasionally encountered in extirpative surgery of the head and neck. It presents a difficult management issue. Little has been reported on functional outcomes after resection and reconstruction of the temporomandibular joint. DESIGN: A retrospective analysis consisting of chart reviews and phone interviews was performed on 17 patients who underwent fibular free flap reconstruction of the temporomandibular joint from 1993 to 1998. RESULTS: Mean follow-up in surviving patients (10) was 41.3 months. Mean age of the group was 62; male-to-female ratio was 11:6. Average hospital stay was 11.6 days. Four patients had no radiation therapy, 2 had preoperative and 11 had postoperative treatment. Five patients had one osteotomy, seven had two, one had three, and one had four. Ten patients could chew, one could not, and none were recorded for the remaining. Diet consisted of regular food for two patients, soft food for seven, full liquids for four, and tube feeds for four. Cosmesis was judged as excellent by eight patients, acceptable by two, and unacceptable by two. Five patients did not describe cosmesis. Most patients stated that bony contour was excellent, but that the soft tissue defect was noticeable. Speech was judged as intelligible by seven and moderately understandable by one. Nine patients did not describe speech. Two patients had postoperative displacement of the fibular head out of the fossa. CONCLUSION: Primary reconstruction of the temporomandibular joint with microvascular fibular flaps is a viable and effective means of restoring function. The majority of patients are able to resume oral feeds, obtain excellent or pleasing cosmetic results, and maintain intelligible speech.

Female↗

The effect of occlusal loss on normal and pathological temporomandibular joints: an animal study.

The effect of unilateral posterior malocclusion on temporomandibular joint intra-articular pathology was studied in sheep. In Group I, osteoarthritic changes were induced in the left temporomandibular joint by gentle scraping of the articular surface (Ishimaru and Goss, 1992). Group II had the same procedures as Group I, with concurrent extraction of all the left maxillary posterior teeth. Group III had a different osteoarthritic precondition in the left temporomandibular joint, allowing synovial fluid to contact the condylar marrow (Ishimaru et al., 1992). Group IV had the same procedure as Group III, with concurrent extraction of all the left maxillary posterior teeth. Group V had unilateral maxillary molar teeth extraction in the left side. At 3 months, the animals were sacrificed and the joints examined histologically. There were no significant differences between normal control joints and those with unilateral tooth extraction (Group V). Similarly the degree of osteoarthritic change was the same between Groups I and II. Significant differences (p < 0.05) were seen between Groups III and IV with tooth extraction increasing the osteoarthritic effects. Hence it was concluded that in sheep, malocclusion had no effect on the normal temporomandibular joint and on one type of experimental osteoarthritis, but accelerated osteoarthritic change in another model.

Alveolectomy↗

Effects of adjuvant on neuropeptide-like immunoreactivity in the temporomandibular joint and trigeminal ganglia.

To study the role of the nervous system in temporomandibular joint arthritis, substance P-, calcitonin gene-related peptide-, and neuropeptide Y-like immunoreactivity in the trigeminal ganglia and temporomandibular joint of rats was examined. Arthritis was induced in female Lewis rats through bilateral injection of a suspension of heat-killed Mycobacterium butyricum in paraffin oil into the temporomandibular joint. Control rats received paraffin oil via the same route. Tissues were collected for neuropeptide extraction 28 days after injection and analyzed by radioimmunoassay and reverse-phase high-performance liquid chromatography. Calcitonin gene-related peptide was significantly increased in the arthritic trigeminal ganglia. Substance P, calcitonin gene-related peptide, and neuropeptide Y in the arthritic temporomandibular joint were significantly increased as compared to controls. The results of this study show that sensory and sympathetic neuropeptides may possibly be associated with the development of arthritis in the temporomandibular joint of rats.

Animals↗

Some anatomical factors of the upper compartment of the temporomandibular joint related to the disc position.

Temporomandibular joint (TMJ) arthrograms of 20 joints with superior disc position (SDP), 20 joints with anterior disc displacement with reduction (ADDWR), and 20 joints with anterior disc displacement without reduction (ADDWOR) were compared. The distance from the insertion of the posterior disc attachment of the upper joint compartment to the top of the mandibular fossa in joints with ADDWR was significantly longer than in joints with SDP and ADDWOR (p = 0.003). The distance from the top of the mandibular fossa to the top of the articular eminence in joints with ADDWR was significantly shorter than in joints with ADDWOR (p = 0.006). The entire distance of the upper joint compartment in joints with ADDWR was significantly longer than in joints with SDP and ADDWOR (p = 0.02).

Adult↗