| Background and purposeTemporomandibular joint disorder syndrome (TMD) is a common maxillofacial diseases, the disease occurs in young,20 to 30 years of age the highest incidence of multiple women, male to female ratio is about 1:2.75. The main clinical features of this disease area for temporomandibular joint pain muscle soreness, joint snapping, mouth and other movement disorders. Etiology of this disease complex pathogenesis is not fully understood, may be related to trauma (such as external forces who have been hit, suddenly bite hard, mouth too big), occlusion disorder or mental factors.Current clinical diagnosis of temporomandibular joint disorder syndrome depends on the clinical manifestations and imaging findings in radiological examinations, X-ray can find changes in bone, but not found in the joints or muscles and soft tissue, articular disc and articular cartilage injury situation, and CT density than the X-ray high-resolution though, but still difficult to show soft tissue lesions within the temporomandibular joint. MRI has multiple sequences, multi-level and multi- parameter imaging features, and has a high resolution of soft tissue, has become an important diagnostic method temporomandibular joint disorder syndrome.Currently many MRI examination sequence, different sequences in different display different structure and soft tissue pathology. Lack of previous literature and research studies, especially MRI, sequence structure and pathological changes in the application of functional sequence organization temporomandibular joint disorder syndrome. This paper aims to study and analyze the temporomandibular joint disorder syndrome MRI findings and MRI T2-mappaing functional sequences in the diagnosis of temporomandibular joint disorder syndrome, especially in T2-MAPPING detect early pathological changes in the articular disc Application value and optimize the temporomandibular joint disorder syndrome MRI scanning technology on this basis, and further study the etiology of temporomandibular disorder syndrome combined with clinical symptoms.Materials and MethodsCollected in October 2013-2014 in October after a period in our hospital clinical, radiological and other related checks, once diagnosed, patients and confirmed by follow-up syndrome, temporomandibular joint disorder, a total of 53 cases of a disease group study, all of the diagnostic meet the diagnostic criteria for temporomandibular disorder syndrome. Including 23 males and 37 females, aged 17-70 years old, with an average age of 43 years.53 cases of temporomandibular joint disorder syndrome, which can be refolded articular disc displacement.Example; irreducible articular disc displacement, Example; articular disc, no significant shift? Cases. In this study, the clinical manifestations of the affected patient group habitual chewing habit; joint pain area joint snapping trismus anxiety, insomnia and other mental discomfort case, the course of about a month ranging from 3 years. Another 20 cases were collected without clinical symptoms of age and sex-matched healthy volunteers as a control group. All temporomandibular joint disorder syndrome, before MR examination were not perform any clinical treatment.Scan using Siemens 3.0T superconductive MRI Skyra machine, check the coil for small joint special LOOP coil of 53 cases of temporomandibular joint disorder syndrome patients and 20 healthy volunteers TMJ line sagittal T1WI, sagittal T2WI, coronal T2WI, sagittal T2-star-p2-anatomical, sagittal T2-star-Image, sagittal T2WI (mouth bit) sequence scan.Image evaluation methods and outcome measures:All scanned images are in Syngo workstation for processing and analysis, respectively, by two diagnostic imaging department physicians experienced double-blind method using MRI for all patients with temporomandibular joint dysfunction syndrome and healthy volunteers image analysis and evaluation, such as disagreement, while reading the final piece, the final consensus after discussion by the two men. MRI outcome measures include: the extent of forward displacement of the articular disc, joint effusion, soft tissue edema, condylar activity and so on. Then use the workstation to get the difference articular disc pseudocolor and T2 values were measured lesion and control groups temporomandibular joint disc, analytical groups articular disc T2 values. And verify the relevance of the articular disc degeneration and T2 values.ResultAnalysis of 53 cases of side group TMJ MRI image:reusable articular disc displacement(16/53,) irreducible articular disc displacement (25/53), joint hover transition bit (8/53); wherein condyle sudden activity limitation (25/53), joint effusion effusion (18/53,) articular disc deformation (40/53). T2 values cases of patients in each group are as follows:control group articular disc T2 average of (34.66±3.23) ms, reusable case group before the articular disc displacement group measured T2 average of (36.56±3.43)ms, case group before Irreducible articular disc displacement group measured T2 average of (37.41±2.95) ms, case group group articular disk rotational displacement measured T2 average of (38.65±3.05) ms. Case group before reusable no significant shift between the articular disc and T2 values grouping irreducible anterior displacement grouping differences. In addition, this study found that the value of the joint after-hours with T2 T2 value of the previous case group and the control group articular disc with no significant difference, consistent with the results reported in the literature abroad. T2 T2-mapinng based on the measured value may reflect the inherent characteristics of the articular disc tissue can be considered as a non-invasive evaluation of early disc degeneration joint approach.ConclusionMRI can provide many TMD structural and morphological changes of the information in the diagnosis of TMD effective imaging method. T2 mapping sequence may be early detection of TMJ disc degeneration situation by changing the value of T2 can temporomandibular joint syndrome early to quantify articular disc disease, help patients with clinical early diagnosis and treatment. |
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