The boneǃÏmetal interface of defect and press-fit ingrowth of microwave plasma-chemical vapor deposition implants in the rabbit model

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The boneǃÏmetal interface of defect and press-fit ingrowth of microwave plasma-chemical vapor deposition implants in the rabbit model
February 2005
Rupprecht S, Bloch-Birkholz A, Lethaus B, Rosiwal S, Neukam FW, Schlegel A.
Clinical Oral Implants Research, February 2005, vol. 16, no. 1, pp. 98-104(7)
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Abstract:
Purpose: The histological differences between the defect and contact areas of the implant surface to bone were tested in 35 New Zealand White rabbits in a standardized model. Microwave plasma chemical vapor-coated implant probes were tested in control and uncoated materials.
Material and methods: In each femur of 35 rabbits, cylindrical implant rods with a planed side were inserted. Three groups, divided in coated and uncoated material at half, were observed 42, 84 and 168 days. The probes were examined histologically for boneǃÏimplant contact in the curved and plane (defect area) sides.
Results: Generally the boneǃÏimplant contact seems to be nearly constant in time in the curved area of coated and uncoated probes. Here the implant was inserted in the press-fit mode. Diamond-coated probes showed similar boneǃÏimplant contact (51.9% (42 days), 62.5% (84 days), 56.1% (168 days)) compared to uncoated material (56.2%, 65.4%, 62.9%). The defect area (plane side) had no boneǃÏimplant contact at the time of insertion and showed increasing values on longer observation times with only significant differences in the 42-day group between coated (17.85%, 35.2%, 47.7%) and uncoated materials (35.5%, 40.55%, 51.81%).
Conclusion: The evaluation of the curved side of the implant probe showed no great variation of boneǃÏimplant contact within the described observation times. This model simulates the usual implant insertion situation. The diamond-coated material becomes osseointegrated at a later time point. The boneǃÏimplant contact was only statistically relevant in one group in comparison to uncoated material.