Stractural changes of alveolar bone following hydroxyapatite ceramics implantaion.1. Comparative observation with iliac bone transplantation by means of mecroradiography and labelling method.:Comparative observation with iliac bone transplantation by mean

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Following an experimental implantation of a hydroxyapatite block, we implanted a hydroxyapatite block on one side and an iliac crest on the other side of the lower jaw bone of an adult dog to study a bone remodelling process that occurs in the implantation bed, the surrounding alveolar bone and a distant part of the mandible. In this experiment, two types of hard tissue labelling agents were used for time tracing examination. The large ground sections of these grafts were also studied by means of microradiography. 1. In the case of iliac bone transplantation, bone resorption was observed in a wide area of the alveolar bone before new bone formation occurred actively. The bone formation gradually decreased in velocity and around the 60th day after surgery, it was observed within limited areas such as in the transplantation bed, the surrounding alveolar bone, and a compact bone in the lower margin of the jaw bone. 2. Up to about the 8th day, bone formation started in the alveolar bone around the transplantation bed. Around the 60th day, remodelling took place in the newly formed bone and the surrounding alveolar bone, and then porosity was produced in the trabeculae. Forty days after surgery, the implanted iliac bone was resorbed and then disappeard completely. 3. There were two ways in which the resorption of the transplanted bone and the formation of the new bone took place. In one way, the resorption of the transplanted bone was followed by the proliferation of the new bone from the base to the top of the transplantation bed. In the other way, resorption and new bone addition progressed alternately until the transplants were replaced by newly formed bones completely. 4. Around the 180th day, the trabeculae near the top of the transplantation bed became stratified and dense, while that in the base area became polyporous. 5. Up to about the 60th day, bone addition continued on the surface of the compact bone in the mandibular canal below the transplanted bone, but afterwards the bone addition became stagnant. 6. In the area adjacent to the implanted hydroxyapatite, new bone formation and internal remodelling occurred basically in the same way as in the case of the iliac bone transplantation, but most hydroxyapatite ceramics were not replaced by newly formed bones. 7. Bone proliferation was not observed in the hydroxyapatite pores before the 30th day and no trabecula was formed until the 90th day.
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Stractural changes of alveolar bone following hydroxyapatite ceramics implantaion.1. Comparative observation with iliac bone transplantation by means of mecroradiography and labelling method.:Comparative observation with iliac bone transplantation by mean

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