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Surgical Tooth Implants, Combat and Field.

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Annual rept. 16 Jul 83-15 Jul 84,

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This Annual Report summarizes progress to date on a long-term implant study of a serrated ceramic dental implant designed for fresh extraction sites. The baboon study was successfully completed last year. Clinical studies are presently continuing. The implants are single tooth rectangular design with serrations arranged for maximal stress distribution of occlusal loads. A three-piece design is used to minimize stresses upon the root portion during the bone ingrowth phase. The serrated root portion is produced from high purity dense aluminum oxide. The upper two parts of the implant, post and core and crown, are conventional metal materials. A series of graded dental implants have been produced to provide an interference fit in any fresh extraction site. The long-term implant studies in baboons were terminated late last year after an average residence time of implantation of 5.25 years in 5 baboons. The longest implant time in this baboon series was 7.71 years. In summary, 88 percent of the implants in baboons survived the initial ingrowth phase. The ingrowth failures were early attempts suggesting technique or operative experience may be a contributing factor. Thirty-eight implants were rigidly retained by bone ingrowth. Histologic analyses of the bone implant interface has been performed at various time intervals. An increase in bone density appears to be associated with the early functional stage of implant life. Eighteen or 62 percent of human implants remain intact.

Subject Categories:

  • Medical Facilities, Equipment and Supplies
  • Medicine and Medical Research

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