The bone-metal interface of defect and press-fit ingrowth of microwave plasma-chemical vapor deposition implants in the rabbit model.
OBJECTIVE
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.


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 bone-implant contact in the curved and plane (defect area) sides.


RESULTS
Generally the bone-implant 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 bone-implant 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 bone-implant 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%).


CONCLUSIONS
The evaluation of the curved side of the implant probe showed no great variation of bone-implant 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 bone-implant contact was only statistically relevant in one group in comparison to uncoated material.
Rupprecht
Stephan
S
Department of Oral & Cranio-Maxillofacial Surgery, Friedrich-Alexander-University of Erlangen-Nuremberg, Erlangen, Germany. stephan.rupprecht@mkg.imed.uni-erlangen.de
Bloch-Birkholz
Alexandra
A
Lethaus
Bernd
B
Rosiwal
Stefan
S
Neukam
Friedrich Wilhelm
FW
Schlegel
Andreas
A
D000497:Alloys; D000818:Animals; D017554:Carbon Compounds, Inorganic; D020099:Coated Materials, Biocompatible; D018130:Diamond; D005260:Female; D005269:Femur; D020007:Implants, Experimental; D008422:Materials Testing; D008670:Metals; D008872:Microwaves; D023421:Models, Animal; D016348:Osseointegration; D019919:Prosthesis Implantation / Q000379:methods; D011817:Rabbits; D017655:Silicon Compounds; D013997:Time Factors; D014025:Titanium
D000497:Alloys; D017554:Carbon Compounds, Inorganic; D020099:Coated Materials, Biocompatible; D008670:Metals; D017655:Silicon Compounds; C031462:titanium alloy (TiAl6V4); D018130:Diamond; D014025:Titanium; C022088:silicon carbide