JOURNAL OF PROSTHETIC DENTISTRY THE

Vol. 99 No. 5      May - 2008

ISSN: 0022-3913      UBIC: 171

RESUMEN

Statement of problem: Immediate occlusal loading of dental implants in the edentulous mandible has proven to be an effective, reliable, and predictable procedure. There is little long-term data available on similar treatments in the edentulous maxilla. Purpose: The purpose of this study was to evaluate the 1 2-month implant survival after immediate loading of4 to 6 implants with fixed screw-retained prostheses in edentulous maxillae. Material and methods: Twenty-one patients, edentulous or with remaining teeth to be extracted in the maxilla, received 4 to 6 implants (n=1 11). The patients were restored with screw-retained fixed provisional prostheses supported by palladium-alloy frameworks within 24 hours after surgery. Insertion torques for implants were at least 40 Ncm. lmplants, grouped as tapered or cylindrical screws, were placed in healed bone or extraction sockets. Implants were also classified as either vertical or off-angle. Definitive prostheses were placed after a mean healing time of 18 weeks. Radiographic examinations were made at the time of placement of provisional prostheses and 12 months later. Between-groups bone resorption was compared using 2-way ANOVA (?=.05). Results: The mean follow-up time for all of the patients was 20 months (range, 13 to 28 months). The cumulative implant survival rate at the 1 2-month follow-up visits (after surgery) was 92.8%; the prostheses survival rate was 100%. No significant differences were found between the survival of tapered or cylindrical screw-type implants placed in post extraction sockets versus those in healed edentulous sites or between vertical and off-angle placed implants. Eight implants failed during the first 3 months, 5 of which were the most distal implants. The mean reduction in marginal bone height over the 1 2-month observation period was 0.84 mm (CI 95%; 0.68-0.99 mm). Conclusions: In this study with 1 2-month follow-up, 4 to 6 implants were sufficient to successfully support 6xed implant screw-retained prostheses in the edentulous maxillae of2l patients. (j Prosthet Dent 2008;99:351 -360)

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