Journal of Temporomandibular Joint
Online ISSN : 1884-4308
Print ISSN : 0915-3004
ISSN-L : 0915-3004
Volume 2, Issue 2
Displaying 1-6 of 6 articles from this issue
  • Stabilization Type Bite Plane
    Masamitsu AKANISHI, Taizou OMAE, Shunji INOUE, Kazuo HIGASHI, Shouichi ...
    1990 Volume 2 Issue 2 Pages 269-278
    Published: November 30, 1990
    Released on J-STAGE: August 06, 2010
    JOURNAL FREE ACCESS
    The effects of bite plane on masticatory muscles during tapping and chewing movements were investigated in subjects with no signs and symptoms of stomatognathic dysfunction.
    Mandibular movements were recorded using a Sirognathograph (Siemens Co.) and electromyograms were simultaneously recorded from masseter, anterior temporalis, posterior temporalis, and anterior digastricus. Two types of bite plane were used for each subject: one for the maxillary arch and the other for the mandibular arch, and additionally, the bite planes were divided into two parts: anterior part and posterior part. The results of this study suggest that the effects of these types of bite plane are different.
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  • Kouichi WAJIMA, Hitosi NAKAGAWA, Akira SUZUKI, Hideki KOGAI, Masako IK ...
    1990 Volume 2 Issue 2 Pages 279-289
    Published: November 30, 1990
    Released on J-STAGE: August 06, 2010
    JOURNAL FREE ACCESS
    Bilateral temporomandibular joint arthrography was performed on 40 patients who were clinically and symptomatially suspected of having unilateral internal derangements of TMJ and on 23 patients who were clinically and symptomatically suspected of having bilateral internal derangements of TMJ.
    59% (37) of the patients showed bilateral internal derangements, 33% (21) of the patients showed unilateral internal derangements, and 8% (5) of the patients had bilateraly normal findings.
    The evaluation of the clinical examination which was standardized by arthrographic diagnosis was less accurate than expected, because the signs and symptoms such as clicking and locking were not necessarily distinctive for anterior disk displacements of TMJ.
    About half the patients with symptomatically and clinically normal temporomandibular joints may have radiographic signs of disk displacement. This suggests that a negative clinical temporomandibular joint examination may involve a risk of being false-negative.
    This clinical investigation showed a high likelihood of bilateral disk displacement in patients with symptoms of unilateral or bilateral internal derangements.
    These findings of bilateral disk displacement and asypmtomatical disk displacement emphasize the importance of examining both temporomandibular joints including asymptomatc joints by medical imaging which can show articular disk, such as arthrography and MRI.
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  • a preliminary report
    Masaki YAMAKI, Tamaki MOHRI, Kazuto TERADA, Kooji HANADA, Katsuhito NI ...
    1990 Volume 2 Issue 2 Pages 290-301
    Published: November 30, 1990
    Released on J-STAGE: August 06, 2010
    JOURNAL FREE ACCESS
    The purpose of this study is to clarify the relationship between mandibular movements and dentofacial morphology.
    The sagittal inclination of incisor and condyle paths, and the angle of mandibular rotation from the intercuspal position to 1mm, 2mm, 3mm, 4mm, most protruded position were compared with variables of Dentofacial morphology by using coefficients of correlation.
    The results were as follows:
    1: The sagittal inclination of incisor and condyle paths and the angle of mandibular rotation have a close correlation to dentofacial morphology derived from a cephalogram.
    2.: In comparison with skeletal classifications, mandibular movement may be influenced by dentofacial morphology.
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  • Sadako KAI, Hiroyuki KAI, Asako HAMASAKI, Yuji SHIRATSUCHI, Hideo TASH ...
    1990 Volume 2 Issue 2 Pages 302-314
    Published: November 30, 1990
    Released on J-STAGE: August 06, 2010
    JOURNAL FREE ACCESS
    The prognosis for conservative treatment was investigated in 35 patients with persistent anterior displacement of the disc without reduction of the TMJ. Nonsurgical reduction of the displaced disc had been impossible in those patients. Conservative treatment with stabilization type splint was performed in all patients, and followed by some prosthetic treatment in 20 patients to reduce the loading force toward the joint after improvement of pain and the maximal interincisal distance. The duration of treatment ranged from 6 to 24 months (mean; 15.5 months). The results were as follows:
    1) The mean of maximal interincisal distance was 27.6mm before treatment and 44.4mm after treatment. 34 patients improved into more than 40mm in the interincisal distance.
    2) 30 patients had pain of the TMJ and 34 patients had pain in the masticatory muscles before treatment. After treatment, TMJ pain had disappeared or been Limited on maximal mouth opening in 27 patients, and muscular pain had disappeared or remarkably improved in 25 patients.
    3) A half of the patients developed crepitus in the course of treatment.
    4) The radiographic. findings showed various bone changes of the condylar head in 21 TMJs before treatment and 26 TMJs after treatment. Some erosive bone changes that were the most frequent findings have undergone the change into the flattening of the condyle. 27 TMJs showed good condylar translation that is beneath or anterior to the crest of the eminence on maximal mouth opening.
    5) Although arthrograms showed morphologic changes of the disc such as perforation, fibrous adhesion or thickening in 20 of 31 TMJs before treatment, symptoms disappeared except for crepitus in the end of treatment.
    6) Bilateral arthrographic examination showed that 9 TMJs with disc displacement without reduction were free of pain.
    These results show that symptoms were satisfactory in the majority of patients after conservative treatment. The TMJ has the capacity of adaptive changes to the displaced disc. Conservative treatment should precede surgical treatment.
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  • Clinical course and treatment outcome of 139 consecutive cases
    Kazuma FUJMURA, Ken-Ichiro MURAKAMI, Hiroyuki MORIYA, Katsuaki MIYAKI, ...
    1990 Volume 2 Issue 2 Pages 315-325
    Published: November 30, 1990
    Released on J-STAGE: August 06, 2010
    JOURNAL FREE ACCESS
    One hundred thirty-nine consecutive cases of temporomandibular joint (TMJ) pain and dysfunction were retrospectively studied.
    First, TMJ pain and dysfunction was clinically classified into type I-IV based on the criteria proposed by Japanese Society for TMJ (1987).
    Type I represent the masticatory muscle disorders, type II; pain and dysfunction grupe, type III; internal derangement, and type IV; degenerative joint desease. Diagnosed group of patients were treated specifically in each category. Surgery was only indicated in type III with closed locking patients who were refractory to initial non-surgical treatment.
    Pre-and post-teatment of clinical findings were compared by means of subjective and objective evaluation using questionaire.
    Success rates in each group were 85.4% in type III with closed lock, 84.2% in type II, 77.3% in type III with click, 75.0% in type III with intermittent lock, 64.7% in type I, and 57.4% in type IV.
    These results indicated that both masticatory muscle disordes and degenerative joint deseases had low responses in general for conventional non-surgical treatment.
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  • Arthroscopically detected pseudowall
    Natsuki SEGAMI, Kenichiro MURAKAMI, Kazuma FUJIMURA, Katsuaki MIYAKI, ...
    1990 Volume 2 Issue 2 Pages 326-332
    Published: November 30, 1990
    Released on J-STAGE: August 06, 2010
    JOURNAL FREE ACCESS
    Superior joint compartment pseudowall in internal derangement with closed lock of the temporomandibular joint was examined arthroscopically in 40 joints of 36 patients. The patients were 2 males and 34 females, with an average age of 37.4 years (13-77 years). In resultant, the pseudowall could be detected in 39 joints (97.5%), in the anterior recess as well as in the lateral aspect of the eminence. The intensity of the pseudowall in each location was found to be mild in 6 joints, moderate in 21 joints, and severe in 9 joints in the anterior recess. On the other hand, the intensity of adhesion was mild in 8 joints, moderate in 12 joints, and severe in 10 joints on the lateral aspect of the eminence.
    In conclusion, the pseudowall was cousidered to be significant factor of hypomobility in temporomandibular joint closed locking, which should be detected and treated in a several manner.
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