| Autor: |
Rupprecht, Stephan, Bloch, Alexandra, Rosiwal, Stefan, Neukam, Friedrich W., Wiltfang, Joerg |
| Předmět: |
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| Zdroj: |
International Journal of Oral & Maxillofacial Implants; Nov/Dec2002, Vol. 17 Issue 6, p778-785, 8p, 6 Black and White Photographs, 4 Diagrams, 3 Charts, 2 Graphs |
| Abstrakt: |
Purpose: Diamond layers can be plated with microwave plasma chemical vapor deposition (MWP-CVD) treatment on metal bases such as titanium-aluminum-vanadium alloy (Ti.6At.4V). The bonding strength of the diamond layer to the metal base is very high, so that no fissures and partial loss of coating take place-well known phenomena that may occur with other coatings in tribologic material testing. In an experimental study using 40 New Zealand White rabbits, a new method for coating implant material was tested for stability of the bone-metal interface. Materials and Methods: The results of histomorphometric and biomechanical evaluation of coated and uncoated probes implanted in the distal femur of 40 rabbits were compared. The animals were divided into 3 groups, with observation times of 42, 84, and 168 days. Results: The bone-implant contact was 5% to 18% less in coated than in uncoated probes. Only the early group, with 42 days healing time showed significant differences. Values for the pull-off force of uncoated material were about 3 to 4 times higher than coated material (diamond layer = 2.7 µm). The force increased 2 to 3 times when 200-nm coatings were tested. Electron microscopy detected undercuts of the rough surface that were obturated by diamond when the coating was too thick. Discussion: Diamond-coated material seems to have no corrosion problems in contrast to all other known implant material. Conclusion: An inert diamond layer on a metal base can become osseointegrated. Biomechanical stability increased by thinning the diamond coating. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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