1) Shibata, K.: A review of literature concerned with biomaterials in the jaw. J. Gifu Dent. Soc. 6: 47-60, 1978.
2) Yamagami, A. and Kawahara, H.: Electron microscopic studies on the tissue-implant interface of single crystal and polycrystal of alumina in vitro and in vivo. Transactions of the 5th annual meeting of the society for Biomaterials. Clemson, South Carolina, April 28-May 1, 1979.
3) Yamagami, A.: Clinical reports on single crystal alumina (Bioceram) implants for 7 years. The Quintessence 9: 55-65, 1982.
4) Kawahara, H., Yamagami, A. and Nakamura, M.: Biological testing of dental materials by means of tissue culture. Int. Dent. J. 18: 443-467, 1968.
5) Kanematsu, N., Hachinoe, M., Hatanaka, D., Shibata, K., Kuroda, Y. and Kawahara, H.: Effect of metal ions to tissue culture cells. Jpn. J. Oral Surg. 23: 1-7, 1977