Comparative push-out test of dense HA implants and HA-coated implants: findings in a canine study.

Two types of hydroxyapatite (HA) implants have been developed: an HA-coated implant and a dense HA implant. For a longer in situ life span, the HA implant must remain chemically stable and possess high resistance to occlusal force. To determine which type of HA implant shows better durability, this comparative dog study was done to evaluate push-out test results of HA-coated implants and dense HA implants of approximately the same size after implantation in the mandibular and coxal bones for periods ranging from 3 weeks to 10 months.

Delay method of implantation enhances implant-bone binding: a comparison with the conventional method.

This report compares the conventional and delay methods of implantation, evaluating the bone formation around a dense apatite implant. In the conventional method, the implant is placed immediately after the cavity is prepared. In the delay technique, the implant is placed 2 weeks after preparation.

The delay method: a new surgical technique for enhancing the bone-binding capability of HAP implants to bone surrounding implant cavity preparations.

To confirm the efficacy of a new apatite-implantation technique, in vivo research was undertaken on 12 dogs. The project was designed to determine the time-dependent effects on alveolar tissues surrounding implant cavity preparations without implantation in bone. In addition, a group of hydroxyapatite (HAP) implants was placed immediately after cavity preparation (conventional method).

A histologic comparison of the functional loading capacity of an occluded dense apatite implant and the natural dentition.

A histologic comparison of the functional loading capacity of an occluded dense apatite implant and the natural dentition at a ratio of one implant to three natural teeth was carried out on six monkeys. Single implants were placed in the maxillary left second molar and mandibular right second molar of each monkey. Four months later, the vertical dimension of occlusion was raised at the contacting areas between the implant and the connected first, second, and third opposing molar teeth by placing metal crowns on them.

Tissue response of apatite-filled resin cement and titanium-reinforced apatite dental implants in dogs.

Abutment and root portion divided two-piece dental implants were designed to modify the one-piece dense hydroxyapatite (D-HAP) implant. The initial placement of the root portion endosseously ensured an aseptic environment and physical stability for the implant during the bone healing period. The outer D-HAP shell of the root portion was fortified by an inner titanium cylinder and cemented with an adhesive resin cement containing 4-methacryloyoxyethyl trimellitate anhydride (4-META) and reinforced by fine apatite filler.