Pure synthetic hydroxyapatite, collagen associated synthetic hydroxyapatite and liposome associated synthetic hydroxyapatite as a bone substitute for defects in bone healing of dogs: transmitted light microscopy osteointegration aspects

The objective of this work was to evaluate histologically the synthetic hydroxyapatite (HAP-91), associated to collagen (COL.HAP-91) and associated to liposome (INT.HAP-91), as bone substitutes. Fourty clinically healthy dogs were studied. After a conventional anaesthesic protocol, the surgical procedure consisted of skin incision on medial surface in the left tibial third middle. A bone fragment of 10 × 6mm in size was retreated in all animals, which were divided into four groups with 10 animals each. Group one was treated with HAP-91, group two with COL.HAP-91, group three with INT.HAP-91, group four did not receive any treatment and was used as a control. Histological material was collected after humane sacrifice of two animals from each group in 8, 30, 60, 120 180 days after surgery. By the 8th day, bone neoformation in control group and around the implant in groups treated with HAP-91 and INT.HAP-91 was observed. On the 30th day, the defect was filled up completely in the same groups, result which was not observed in COL.HAP-91 group. Bone repair was complete in control group, HAP-91 group and INT.HAP-91 group (most premature), but in animals treated with COL.HAP-91 complete regeneration was not observed.

Dog; synthetic hydroxyapatite; bone substitute


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