A case of calcifying epithelial odontogenic tumor was studied histochemically and electron microscopically. This case was characterized by an abundant amount of homogeneous substance and the presence of numerous clear cells. Although the homogeneous substance was shown to be an amyloid material in nature, it was supposed to be an extracellular product of the epithelial tumor cells. The clear cells contained abundant glycogen gunnies in their cytoplasm.

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By acupuncture stimulation (at the Chinese meridian point), the total number of oral Streptococci and the caries-pathogenic bacteria, Streptococcus mutans, in the rats were decreased. The anti-RC-20 (Streptococcus mutans) titer of the rat serum increased as the result of acupuncture stimulation. Rat caries induced by a caries-inducing diet (6-PMV*2) was reduced by acupuncture stimulation.

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The author presents the methodology and findings of a procedure for arthroscopic examination of the temporomandibular joint cavity by means of a method of puncture of the temporomandibular joint which he developed. The procedure was based on the temporomandibular joint puncture method and involved the tandem insertion of a puncture needle and sheathed needle into the joint cavity and examination of the cavity and cavity wall under perfusion of physiological saline solution. Color photographs of the findings are presented. The advantages by this method are as follows: 1) Direct observation of the cavity, 2) observation of the movement of the joint, 3) biopsy for histopathologic diagnosis, 4) still and cine photography of the findings. Arthroscopy of the temporomandibular joint is at present being applied clinically and is extremely effective in the diagnosis and selection of therapy. It will no doubt play an important role in the diagnosis of the diseases of the temporomandibular joint in the future.

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