Journal of the Japanese Association of Regenerative Dentistry
J Jpn Assoc Regenerative Dent Vol.5(1) pp.11-19
ISSN 1348-9615


Structure and Constitution Changes in the Supragingival Dental Calculus in the Age Difference

Hiroyuki MISHIMA1, Ikuko KAWAI2, Akiyasu NISHINO1, Saki WAZIKI1, Kazuo TANAKA3, Atsushi OOKUBO4, Yasuo MIYAKE5 and Takaaki YANAGISAWA5
1Department of Health Sciences, Kochi Gakuen College, 2Aplied Life Science Course, Kochi Gakuen College, 3Tanaka Dental Clinic, 4Department of Histology, Cytology and Development, Nihon University School of Dentistry at Matsudo, 5Ultrastructural Section, Oral Health Science Center, Tokyo Dental College

The supragingival dental calculi of the twenties of youth and the past forty of adult were compared concerning the change of structure and composition. The dental calculi were examined using a stereoscopy, a SEM, and the SEM-EDS. The granular crystals were observed in the calculi of youth. The calculi of adult showed a lamellar pattern. The granular, fibrous, and flake-like crystals were observed in the calculi of adult. SEM-EDS analysis showed that Ca and P were major elements, and Na and Mg were the trace elements. It was suggested that the difference may be cause in the content of Na and Mg related with aging. The Ca/P molar ratio was 1.19 on average in the youth. The Ca/P molar ratio was 1.46 on average in the adult. The possibility that the difference is in the crystal of dental calculus because of the aging was suggested.

Keyword: human gingival fibroblast, attachment, GTR membrane, collagen, fibronectin