Journal of Temporomandibular Joint
Online ISSN : 1884-4308
Print ISSN : 0915-3004
ISSN-L : 0915-3004
Volume 17, Issue 3
Displaying 1-5 of 5 articles from this issue
  • Clinical survey for the last 4 years
    Yu OGAWA, Masanori FUJISAWA, Kiyotaka KANEMURA, Takuya SUZUKI, Kenji O ...
    2005 Volume 17 Issue 3 Pages 203-208
    Published: December 20, 2005
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The relationship between temporomandibular symptoms at initial visit and magnetic resonance imaging (MRI) in the temporomandibular joint (TMJ) was investigated.
    Subjects were 117 patients diagnosed as having temporomandibular disorder to be examined by MRI in the TMJ region for the four-year period from January 1999 to December 2002 in the Department of Fixed Prosthodontics, Iwate Medical University Dental Hospital.
    Partial disagreement was found between the symptomatic side and disc dislocation side of TMJ from the results of MRI and the clinical examination.
    The mouth opening range in the bilateral disc displacement with reduction group was 43.4mm on average, showing a significantly wider range than the bilateral disc displacement without reduction group (27.0mm; p<0.01, Scheffe's F test) and unilateral disc displacement without reduction group (36.9mm; p<0.05, Scheffe's F test).
    These results suggest that limitation on mouth opening can be caused by restriction of condylar translation and/or possible pain generated by compressing retrodiscal tissue due to disc displacement without reduction.
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  • Masashi SUGISAKIA, Akira ERIGUCHI, Koji KINO, Hakubun YONEZU, Atsushi ...
    2005 Volume 17 Issue 3 Pages 209-214
    Published: December 20, 2005
    Released on J-STAGE: February 23, 2011
    JOURNAL FREE ACCESS
    Purpose: The purpose of this study was to confirm that finger pressure values just after finger calibration (post-calibration) converge toward a target value and that their variance after calibration narrows statistically.
    Methods and Subjects: Twenty-nine dentists participated in this study as volunteers. Finger pressures of 1.5kg that they felt right by one were recorded on a PC under the conditions that the monitor of the calibration equipment was off, and without any exercise. Subsequently, for one minute, they calibrated their finger pressure while monitoring 1.5kg. They then re-measured 1.5kg with the monitor off. They carried out each measurement five times.
    Statistical Examination: The Bartlett analysis for homoscedasticity was used to confirm a statistical significance betweenthe data of preand post-calibration, and Bayes statistics were used for a posteriori probability distribution.
    Results: The mean values were 1.61±0.56kg in the pre-calibration and 1.74±0.23kg in the post-calibration. The Bartlett analysis showed a significance (p<0.001) between pre-and post-calibration. In the Bayes statistics, the 95% confidence interval of the post-calibration narrowed to 1/24 of the prior distribution, and that of the posteriori distribution (1.72±0.018) narrowed to 1/27 of the prior distribution.
    Conclusions: It was shown that the variance of post-calibration narrowed more than that of pre-calibration statistically. Although the mean of post-calibration was larger than the target value, it was suggested that finger pressure neared the target value by repeating the calibration.
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  • Kenji OHNO, Shinichiro SUMITOMO, Kenzou MOURI, Kotaro KUWAJIMA, Yoshia ...
    2005 Volume 17 Issue 3 Pages 215-217
    Published: December 20, 2005
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Chronic dislocation of the temporo-mandibular joint (TMJ) is often neglected for a long time without resetting for more than 3 or 4 weeks. In such cases, closed reduction may be very difficult because of fibrotic and/or osteogenic changes in the joint space. A twentysix-year old man was referred to our hospital complaining of long-term anterior dislocation of the TMJ. Jaw manipulation using the Hippocraes method followed by intra-articular pumping of the upper joint space of the TMJ achieved a good resetting result.
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  • Yui MORI, Takumi ARIKA, Kenji KAKUDO
    2005 Volume 17 Issue 3 Pages 218-223
    Published: December 20, 2005
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Stress is a major factor that contributes to temporomandibular joint disorders (TMD), but its evaluation is not reliable. Among salivary stress hormones, chromogranin A (CgA) is considered to be a novel stress marker as an objective evaluation. A control group consisting of 19 healthy adult volunteers without TMD was divided into two types of stress (cross-over method), psychological and physical stresses, and changes in the salivary CgA levels were investigated to establish an objective method of evaluating the influences of stresses for patients with TMD. In addition, psychological stress induced changes in the salivary CgA levels were investigated in the control group and the TMD patient group consisting of 53 patients with TMD diagnosed by MRI. Mixed saliva was collected every 5 minutes before, during, and after the stress loading using cotton for saliva sampling, Salivette (Sarstedt Co., Germany).
    Salivary CgA was measured by ELISA. The measured values were log-transformed. In statistical analysis, repeated measures two-way layout analysis of variance and multiple comparison analysis were performed.
    No significant differences were noted in the salivary CgA levels at any time point between the two types of stress loaded. On comparison of the control and the TMD groups, the CgA values were significantly different among the time points, but no significant difference was noted between the two groups. In multiple comparison between the baseline CgA value and the CgA value at each time point, the value immediately before stress loading and the value at 5 minutes of stress loading were significantly higher than the baseline value in the TMD group.
    It is suggested that measurement of salivary CgA may be useful for objective evaluation of the stress condition of patients with TMD.
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  • Kotaro MIYOSHI, Takayoshi OHNUKI, Hirokazu NAGAI, Tetsusada MUSASHI, R ...
    2005 Volume 17 Issue 3 Pages 224-231
    Published: December 20, 2005
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the morphological changes of the temporomandibular joint (TMJ) in patients with mandibular prognathism before and after surgical orthodontic treatment using magnetic resonance imaging (MRI).
    A total of 26 patients (5 men, 21 women, mean age 22.9 years) who underwent sagittal split ramus osteotomy (SSRO) were examined. We evaluated the changes of disc position, disc morphology, and condylar morphology. Anterior disc displacement (ADD) was seen in 9 of 52 joints (17.3%) before treatment. There was no change in ADD after treatment. Disc deformity was seen in 9 of 52 joints (17.3%) before treatment. After treatment, disc deformity was worse in one joint. There was no significant difference of disc position or disc morphology between before and after treatment. Condylar bony change was seen in 2 of 52 joints (3.8%) before treatment. After treatment, the number of joints with condylar bony change increased from two to three (5.8%). There was no significant difference of condylar bony change between before and after treatment. The rate of ADD and joints with condylar bony change in patients with the deviation side of mandibular asymmetry was significantly higher than that in patients with mandibular symmetry. There was no significant difference of ADD and condylar bony change between before and after treatment. This study suggested that surgical orthodontic treatment with SSRO on patients with mandibular prognathism had a small effect on the TMJ.
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