アパタイト・セラミックス・インプラント埋入後の咬合開始時期と骨形成との関連性に関する組織学的研究

抄録

The purpose of this study was to investigate the relation between the initiation of occlusion and the bone formation after the implantation of the apatite ceramics.
P₃, P₄ and M₁ were extracted from fourteen adult mongrel dogs. After two months, one-piece and two-piece cylindrical implants measuring 5.0-6.5mm in diameter and 11mm in length of the buried portion were implanted. The two-piece implant consisted of the apatite-root and Ti-core. After 2, 4 and 8 weeks, both implants were put under occlusal function by cementing the metal crowns. The dogs were sacrificed at 2, 4 and 8 weeks after the initiation of occlusion. The specimens of the mandibles with the implants and the crowns were histologically examined.
In the case of the implants under occlusion at 2 weeks after implantation, the greater part of the implant surface was covered with a fibrous tissue.
In the case of the implants under occlusion at 4 weeks after implantation, one-half of the implants was covered with a fibrous tissue and the other one-half was in contact with the bone.
In the case of the implants under occlusion at 8 weeks after implantation, all the implants were in contact with the bone. The bone around the implant increased after occlusion.