The objective of this study is to compare the degree of the occlusal-bearing ability of 2-piece apatite implant to that of natural dentition. It is conducted by placing implants at M2 and M2 areas of adult monkey. Four months later, the occlusal vertical dimension was raised to apply the occlusal force only on the implants by inserting connected crowns on M3M2M1 and M1M2M3. Three months after loading, the tissues surrounding the implants and the antagonist teeth were histologically examined.
Results: The antagonist teeth: The connected antagonist teeth show much bone resorption on the inner surface of the alveolar wall and the roots are partly in direct contact with the bone and intruded. Implant: 1. Due to the resorption from extraction, enhanced remodeling is seen in the compact bone of the experimental site. The degree of remodeling is higher toward the coronal direction. 2. Realigned functionally oblique toward the implant, thickened trabeculae, of both the lamellae and woven bone, supported the implant. 3. Bone formed widely on the buccal and lingual surfaces of the compact bone near the implant. In the areas of close to the direct contact of the implant to the compact bone, remodeling with osteon realignment in the axial direction was observed. 4. Most embedded surfaces of the implant were covered and bound to the bone.