Ronen Shika Igaku
Online ISSN : 1884-7323
Print ISSN : 0914-3866
ISSN-L : 0914-3866
Volume 13, Issue 3
Displaying 1-9 of 9 articles from this issue
  • Tetsuya Habu
    1999 Volume 13 Issue 3 Pages 155
    Published: March 31, 1999
    Released on J-STAGE: December 05, 2011
    JOURNAL FREE ACCESS
    Download PDF (1224K)
  • Ikuma Watanabe
    1999 Volume 13 Issue 3 Pages 157-165
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
    Download PDF (11295K)
  • Hidero Terasawa
    1999 Volume 13 Issue 3 Pages 166-174
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
    In order to verify the influence of tooth loss and masticatory alterations on cholinergic neurons in aged rat brain, 36 Wistar male old rats were divided into the following groups: a control group (fed with a solid diet), a soft diet group (fed with a powder diet containing the same components as the solid one), and a molarless group (all molars were removed at 25 weeks and then the rats were fed with a powder diet). Immunohistochemical and biochemical studies were performed.
    The results obtained were as follows.
    1. The number of choline acetyltransferase (ChAT)-positive neurons in the nucleus of the diagonal band/medial septal nucleus showed statistically significant differences between the control and the molarless group (p<0.01).
    2. The number of ChAT-positive neurons in the nucleus of the diagonal band/medial septal nucleus showed no statistically significant differences between the control and the soft diet groups.
    3. Acetylcholine (ACh) concentrations in the hippocampus showed statistically significant differences between the control and the molarless group (p<0.05).
    4. Choline (Ch) concentrations in the hippocampus showed no statistically significant differences between the control and the molarless group.
    Tooth loss and masticatory alterations in rat caused a decrease in ChAt-positive neurons in the nucleus of the diagonal band/medial septal nucleus by a change of afferent. A decrease in ChAT-positive neurons in the nucleus of the diagonal band/medial septal nucleus caused a decline in ACh concentrations in the hippocampus.
    Download PDF (5684K)
  • Hisashi Fujita, Hirohiko Hirano
    1999 Volume 13 Issue 3 Pages 175-182
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
    In archaeological human skeletal remains, the question of age changes in dental caries has never been examined in Japan. The purpose of this study is to consider the problem of age changes in dental caries in the Edo era Japanese. The materials used in this study consisted of 99 excavated adult human skeletal remains from nine Edo period sites (1603-1868). For comparison, the skeletal remains were assigned to one of two age groups, ca. 20-39 years old (younger adults) and ca. 40 and over (older adults). The authors investigated dental caries of the materials in several ways, including caries lesions.
    The results were as follows:
    The older adults have a higher rate of dental caries (18.8%) than the younger adults (7.0%); the older adults have also a higher rate of dental caries than the younger adults in most of the tooth calsses. Dental caries of the anterior teeth is vere rare in the younger adults; on the other hand, the older adults have a relatively of high rate. The difference in the rate of dental caries in the anterior teeth between the younger adults and the older ones was clearer than that in the posterior teeth. The rate of antemortem tooth loss of maxillary teeth was higher than that of mandibular teeth. Root caries were frequent in the older adults rather than the younger ones, but occlusal caries were infrequent in the older adults, It is supposed that occlusal caries arose in the fissures and pits in the younger adults, however, occlusal caries were rare due to the advanced dental attrition, and root caries, which are closely associated with alveolar recession, were frequent in the older adults. Because of tooth brushing, the caries in the buccal surface must have reduced in Edo era Japanese in comparison with that of Jomon era people.
    We are convinced that further study in this area offers the key to understanding oral health and preventive dentistry both for nowadays and the future.
    Download PDF (1007K)
  • For the Disabled Elderly with Dementia
    Mika Saito, Naoyoshi Ishiyama, Ikuma Watanabe, Chiyoko Hakuta, Ikuo Na ...
    1999 Volume 13 Issue 3 Pages 183-188
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
  • Development of a New Electrical Oral Brush with Auto-Liquid Supply and Suction-System and its Application
    Naoyoshi Ishiyama, Masatsune Yamaguchi, Hirotsugu Yamazaki, Genyuki Ya ...
    1999 Volume 13 Issue 3 Pages 189-194
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
  • Bacteriological Study on the Effect and the Safety of a Newly-Developed Electrical Oral Brush with Auto-Liquid Supply and Suction-System to be Used by a Co-patient
    Masaaki Iwaku, Masayoshi Fukushima, Naoaki Kiryu, Takashi Fukuda, Nori ...
    1999 Volume 13 Issue 3 Pages 195-199
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
  • Relation between Oral Conditions and Satisfaction of Mastication
    Masayuki Morizawa, Shigezo Hirano, Shoji Kobayashi, Yasuki Takahashi, ...
    1999 Volume 13 Issue 3 Pages 200-204
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
  • The Substance and Repeated Times for Adjustments after Placed New Complete Dentures
    Nobuhito Gionhaku, Yoshihiko Moriya, Tomoaki Takizawa, Mizuki Nishikaw ...
    1999 Volume 13 Issue 3 Pages 205-213
    Published: March 31, 1999
    Released on J-STAGE: February 26, 2014
    JOURNAL FREE ACCESS
feedback
Top