Evaluation of a new dense-porous hydroxylapatite endosteal dental implant.

A new hydroxylapatite implant with a dense and porous part, improved the implant neck-lamina propria interface when placed in that alveolar bone of dogs. Bone tissue was formed on the surface of the porous part above the ridge of the alveolar bone and fibrous bands from the lamina propria surrounding the neck of the implant were anchored into this newly formed bone. The new tissue structure was very similar to that of natural teeth and gingiva. Quantitative histologic analysis indicated that this tissue arrangement provided protection against bacterial invasion and reduced gingival pocket formation.