[Sinus floor elevation and implantation--a retrospective study].
A retrospective analysis of sinusfloor elevation and implantation should evaluate in a sense of quality control the clinical results and complications during or after sinusfloor elevation. In our institution we performed 98 sinusfloor elevations in 80 patients (44 women, 36 men) between August 9, 1995 and November 18, 2002. In those elevated sinuses, 201 implants were inserted till October 16, 2003. Dates were sampled from the patient medical histories. Sinusfloor elevation and implantation in posterior maxillary bone have a good prognosis. Nevertheless implant survival depended on the chosen implant system (Kaplan-Meier-analysis). Implant survival was 98% for Straumann implants and 80% for Frialit-II implants after two years. A significant correlation between Frialit-II implants and Straumann implants (p=0.0119) was identifiable. There was no difference in healing between different augmentation materials (autogenous bone, Ceros 82, Algipore), but case numbers were too small for a relevant validity. In one-stage procedures implant loss was 8%, in two-stage procedures it was 18%. Implant losses in smokers were generally higher than in non-smokers. The period of consolidation of the augmentation's material introduced in two-stage procedures was about 10.3 months, healing time of implants 9.2 months. In one-stage procedures healing time of implants was about 7.7 months. Membrane perforations during surgery occurred in 11% and were not related to the development of postoperative sinusitis as described in literature.