COMPLICATIONS AND PRIMARY FAILURES RELATED TO FIXED METAL-CERAMIC BRIDGE PROSTHESES MADE BY DENTAL STUDENTS

Porcelain fused to metal provides better aesthetics in fixed partial d entures than veneers with gold-resin that were used formerly. The aim of our study was to evaluate complications and primary failures of fix ed metal ceramic bridge prostheses made by dental students. We studied 61 patients (32 women, 29 men, mean age 49 years, range 28-73 years) treated during years 1990-1993. Data were collected from the patient f iles. Altogether 82 bridges were made (mean 4.1 units, range 2-6), 221 abutments (mean 2.7, range 2-6) and 136 pontics (mean 1.6, range 1-4) . Forty-seven cast cores were used in 29 bridges (mean 0.4 cores, rang e 1-3) and semiprecious attachments as an extra attachment in two brid ges. Seven teeth were extracted due to complication and/or failure dur ing endodontic treatment and root canal perforation during preparation . In two cases the abutment tooth was fractured by removing the old cr own. Four unsuccessful bridges were remade and in seven cases the firi ng of porcelain was renewed. The study concludes that most common fail ures of fixed metal ceramic bridges made by dental students occur duri ng root canal preparation of abutment teeth.