Sinus floor elevation using anorganic bovine bone matrix (OsteoGraf/N) with and without autogenous bone: A clinical, histologic, and histomorphometric analysis - Part 2 of an ongoing prospective study

One of the goals of the sinus elevation procedure is the creation of vital bone to effect the osseointegration of dental implants placed in the poster ior maxilla. With this goal in mind, in 1993 the Department of implant Dent istry at New York University College of Dentistry began a long-term clinica l, histologic, histomorphometric, and radiographic study of the sinus eleva tion procedure. The primary parameters included the effects of graft materi al selection, time allowed for graft maturation and the effect of barrier m embrane placement on the creation of vital bone in the sinus cavity. The ef fects of these and other parameters on implant survival rates were also to be evaluated. This paper reports the data collected on a subgroup of 113 si nus elevations that used anorganic bovine bone matrix (OsteoGraf/N) alone o r in combination with autogenous bone and/or demineralized freeze-dried bon e as a graft material. This is the second in a proposed series of papers th at will result from this ongoing research project. The results of this stud y indicate that. OsteoGraf/N appears to be an effective graft material with a 98.2% implant survival rate to date: vital bone formation increased with time, vital bone formation increased moderately when demineralized freeze- dried bone allograft was added and increased substantially when intraoral a utogenous bone was added or when an expanded polytetrafluoroethylene membra ne was used: and the increased height achieved by the procedure was stable over a 3-year period. Because of the high overall implant survival rate, if was not possible to determine the relationship between vital bone formatio n or membrane usage and implant survival.