Journal of Temporomandibular Joint
Online ISSN : 1884-4308
Print ISSN : 0915-3004
ISSN-L : 0915-3004
Volume 33, Issue 1
Displaying 1-4 of 4 articles from this issue
commentary
original articles
  • Kaori KOHI, Hirokazu ITO, Chinami IGARASHI, Kaoru KOBAYASHI, Chikahiro ...
    2021 Volume 33 Issue 1 Pages 14-19
    Published: April 20, 2021
    Released on J-STAGE: October 20, 2021
    JOURNAL FREE ACCESS

    Anatomically, the mandibular fossa is paired with the mandibular condyle, and a quantitative and objective evaluation of its changes is important. In this paper, we report a study using MR images to clarify the reliability of a method of objectively evaluating the mandibular fossa area. The subjects were 15 patients with temporomandibular disorders who had MR images taken at the first visit, for a total of 30 joints (2 males, 13 females, average age 29.2 years, median 19.0 years).

    Using Aze Win (AZE, Tokyo), the area of the mandibular fossa of 30 joints was measured by two examiners. Each measurement was carried out two times at an interval of more than one month. The first and second values were statistically analyzed using Spearman's rank correlation coefficient at a significance level of 1%, and intraclass correlation (ICC) at a significance level of 5%.

    Spearman's rank correlation coefficients were 0.9426 (p<0.001) and 0.9146 (p<0.001), showing a very high correlation between the first and second area values. The intra-observer reliability was 0.9873 and 0.9647, and the ICC was 0.9318 (first measurement) and 0.9749 (second measurement). Thus, it was shown that this measurement method has highly reliability, both intra-observer and inter-observer.

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case report
  • Yuta YAMAZAKI, Hisao AJIMA, Yoshiaki ARAI, Atsushi KAWAMURA, Makiko TA ...
    2021 Volume 33 Issue 1 Pages 20-25
    Published: April 20, 2021
    Released on J-STAGE: October 20, 2021
    JOURNAL FREE ACCESS

    Anterior open bite may occur as a secondary malocclusion due to degenerative change of the mandibular condyle.

    We present a case of anterior open bite caused by bilateral osteoarthritis treated with an occlusal overlay metal splint. The patient, a 37-year-old female, was referred to our hospital in November 2006 complaining of TMJ pain and trismus. After some clinical examinations, she was diagnosed with osteoarthritis of the TMJ. During conservative treatment for temporomandibular disorder (TMD), anterior open bite was observed in February 2007. After informed consent on her TMJ condition and several treatments, in July 2007, a mandibular overlay metal splint was applied to improve her masticatory dysfunction due to open bite, and she continued to use the stabilization splint at night. The condylar head resorption was confirmed not to have progressed by CT examination in October 2013. Her daily masticatory function recovered with long-term use of the splint without any signs or symptoms of TMD. It is suggested that the occlusal overlay splint is an effective strategy for open bite due to bilateral condylar resorption.

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