Abstracts (33)
6-7 Year Results of a Prospective Clinical Trial using ENDOPOREŽ Implants to Retain a Mandibular Overdenture.
D.A. Deporter, P.A. Watson, R. Todescan, M. Pharoah, A. Heller, R. Heller,
University of Toronto, Faculty of Dentistry, 124 Edward Street, Toronto, Ontario. CANADA M5G 2L3
Abstr. Submitted to Annual Meeting of the Academy of Osseointegration, Atlanta March 1998
This is a 6 to 7 year report on 52 fully edentulous patients treated at the University of Toronto each with free-standing ENDOPOREŽ implants(mean length 8.7mm) in the anterior mandible and an overdenture. This tapered endosseous implant device has a multilayered surface coat of spherical particles of Ti-6Al-4V (45 to 150um dis.) greatly increasing its surface area for osseointegration and allowing 3-dimensional interlocking by bone ingrowth, making possible the routine use of short implants. Three patients have died and one was lost to follow-up after 4 years. The 5-year cululative survival rate for the remaining patients was 93.4% and this figure remains unchanged to date when all remaining patients have completed 6 years and 21 have completed 7 years of function. The pattern of crestal bone loss was similar to that predicted from our earlier animal work, although the peri-implant crest took longer to stabilize at the level of the junction of the machined collar-to-porous coat junction. Mean crestal bone loss in highly standardized radiographs, in the first year 0.45mm, and this decreased to 0.17mm and 0.13mm in years 2 and 3. There was no significant change in mean bone height at years 4 or 5, and this equilbrium continues to be maintained at 7 years based on radiographs of those 21 patients who have passed this time point. The overall mean annual bone loss from years 2 through 7 was 0.03mm, i.e. clinically insignificant. The results of this study have now been replicated in a private practice setting using an identical treatment protocol and show a 3 year survival rate of 96.1%
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