1) Denissen, H. W., de Groot, K., Makkes, P. Ch., Van den Hooff, A. and Kloopper, P. J.: Tissue response to dense apatite implants in rats. J. Biomed. Mater. Res., 14: 713-721, 1980.
3) Bhaskar, S. N., Brady, J. M., Getter, L., Grower M. F. and Driskell, T.: Biodegradable ceramic implants in bone. —Electron and light microscopic analysis—. Oral Surg., 32: 336-346, 1971.
4) Levin, M. P., Getter, L., Cutright, D. E. and Bhaskar, S. N.: Biodegradable ceramic in periodontal defects. Oral Surg., 38: 344-351, 1974.
5) Levin, M. P., Getter, L., Adrian, J. and Cutright, D. E.: Healing of periodontal defects with ceramic implants. J. Clin. Periodontol., 1: 197-205, 1974.