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Volume 9 , Issue 2
March/April 1994

Pages 163-168

Histochemical and Laser Scanning Microscopy Characterization of the Hydroxyapatite-Bone Interface: An Experimental Study in Rabbits

Adriano Piattelli, MD/Maurizio Piattelli, MD/Nicola Romasco, MD/Paolo Trisi, DDS, PhD

PMID: 8206551

An experimental study was done in rabbits to characterize the bone-hydroxyapatite (HA) interface by the use of histochemical staining for mineralized tissue and laser scanning microscopy (LSM) on undemineralized sections. Twenty HA-coated Sustain implants were placed in rabbit femurs and retrieved after 6 months. The specimens were then processed to obtain thin ground sections. In all specimens, there was intimate contact between bone and HA. In some portions, mineralized bone was in tight, direct contact with the HA, while in other portions, a basophilic unmineralized material was present between bone and HA. This material was thicker in areas with active bone formation upon the HA surface and had staining characteristics similar to the material present around the osteocyte lacunae. LSM showed a fluorescence present in many areas of the interface, in osteocyte lacunae, and inside the coating. An organic bonding between bone and HA can probably be hypothesized. (INT J ORAL MAXILLOFAC IMPLANTS 1994;9:163168)

Key words: hydroxyapatite, interface, laser scanning microscopy

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