Abstract
For making apatite implant easy to use clinically and characteristics of apatite being bony-ankylotic surely exhibit, the implant was devised so as to consist of the root portion to be embedded completely in bone under periosteum at the first operation and the abutment portion to be cemented to the root portion after excising corresponding mucosa after bone healing. Developed 2-piece implant is formed of the root portion having both the dense apatite outer tube and titanium-made flanged inner tube, being attached to each other with finepowdered apatite filled-cement through heat polymerization, and the titanium-made abutment portion. 2-piece implants were implanted in adult dog lower jaw bone for two weeks, five months and ten months, respectively, for evaluation of the tissue around the root portion.
Result:
1. On almost apatite surfaces of root portion, bone formed, and after five months of implantation, root portion and jaw bone were in a state of being united.
2. It was found that both the slight resin cement existing between the titanium flange forming the root portion top surface and the apatite outer tube and the titanium flange were harmless to the around tissue and did not inhibit the bony ankylosis of apatite part.
