A 2-YEAR REPORT ON MAXILLARY AND MANDIBULAR FIXED PARTIAL DENTURES SUPPORTED BY ASTRA-TECH DENTAL IMPLANTS - A COMPARISON OF 2 IMPLANTS WITH DIFFERENT SURFACE TEXTURES

In 50 partially edentulous patients, 133 (48 maxillary; 85 mandibular) Astra Tech dental implants of 2 different surface textures (machined; TiO-blasted) were alternately installed, supporting 52 fixed partial dentures (FPDs). Before abutment connection 2 machined implants (1 man dibular; 1 maxillary) were found to be non-osseointegrated and were re placed. Another implant could not be restored due to a technical compl ication. Two FPDs were remade because of technical complications, both because of abutment fractures. Thus, after 2 years in function, the c umulative survival rates were 97.7% and 95.7% for implants and prosthe ses, respectively. There was no statistically significant difference i n survival rate between the 2 types of implants, 100% (TiO-blasted) vs 95.3% (machined), P=0.24. After 2 years in function, when both jaw an d type of implants were combined, the mean (SD) marginal bone loss was 0.24 (0.69) mm. No statistically significant difference in bone loss was found between the 2 types of implant after 2 years of loading, 0.0 4 (0.82) mm, P>0.30.