Surgical Tooth Implants, Combat and Field.
Annual progress rept. no. 11. 15 Dec 79-15 Jul 81,
BATTELLE COLUMBUS LABS OH
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Long term implant studies of alumina tooth roots are being performed in both humans and baboons. The implants designed for this project are a single root rectangular design with serrations arranged for maximal stress distribution of occlusal loads. THe implant is of a three-piece design. The serrated root portion is alumina ceramic. The upper two parts of the implant post and core and crown are conventional dental materials, usually gold. Roots are produced by grinding bisque fired alumina stock on a computer controlled milling machine. This technique provides high quality, high strength, and design flexibility. A series of nineteen graded sizes of implants have been produced. In the last year design modifications and improved fabrication techniques have allowed the production of roots as small as 4 mm x 4 mm in cross section. Serration depth was selectively reduced in smaller implants to provide for the necessary bulk of ceramic. Extensive quality assurance has been performed on the implants intended for human use. Quality assurance procedures include wet densities, visual inspection and mechanical testing of test bars. Modification of post and core design and its effect upon overall implant strength were evaluated.
- Medicine and Medical Research