The records were evaluated for two months in late 2010 by two of the authors.
Factors including age, sex, number of units (abutment teeth and pontics), occluding teeth in the opposing jaw, X-ray status, type of cement used, endodontic treatment before FDP delivery, post material, and prosthetic complications such as cohesive fractures, adhesive fractures, and loss of retention were registered.
The introduction and rapid development of computer-aided design and computer-aided manufacturing (CAD/CAM) technology in prosthetic dentistry have been highly evident in the last decade.
This three-year retrospective follow-up study was essentially compiling and analysing records from all patients consecutively treated with zirconia FDPs.
Single crowns and implant-supported FDPs were not included.
All other complications during the follow-up period were also registered.
The treating dentist conducted clinical follow-up examinations once a year for three years.
reported 98.1% survival rate for 618 crowns, and Dogan et al.
reported a 100% survival rate for 20 anterior placed crowns [8, 9].
According to a systematic review, the 5-year survival rate for zirconia FDPs is 90.1% .
However, the 5-year survival rates may range from 74.7% to 100% [11, 20].
Zirconia restorations for dental replacements are made using CAD/CAM technology.
Production is based on scan data from a scanned abutment tooth or stone die which is processed with CAD software.
A few studies have been published on the clinical performance of zirconia restorations.