Table of Contents
Journal of Oral Implants
Volume 2014 (2014), Article ID 263925, 7 pages
Review Article

Meta-Analysis of Oral Implant Fracture Incidence and Related Determinants

1Bernhard Gottlieb School of Dentistry, Vienna Medical University, Sensengasse 2a, 1090 Vienna, Austria
2Academy for Oral Implantology, Lazarettgasse 19/DG, 1090 Vienna, Austria

Received 25 March 2013; Revised 16 September 2013; Accepted 16 September 2013; Published 2 January 2014

Academic Editor: Gregory Polyzois

Copyright © 2014 Bernhard Pommer et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dental implant fracture is a rare biomechanical complication, however, one of the most serious and frustating ones as it is generally associated with implant and prosthesis failure as well as the surgical hazards of explantation and reimplantation. To gain insights into implant fracture rates and the impact of patient-, surgery-, and prosthetic-related factors, systematic review and meta-analysis of the English literature were performed. Electronic and hand searches yielded 69 relevant publications reporting on 827 fractures out of 44521 implants investigated. The overall incidence of implant fractures was 1.6%. Mean patient age at the time of implant fracture was 54 ± 11 years, and 70% occurred in males. The vast majority (85%) occurred in posterior regions of the mouth (premolar or molar positions). No tendency of increased fracture rates could be noted for short implant lengths or narrow implant diameters. Implant fractures occurred after 4.1 ± 3.5 years of loading, on average, in most cases (88%) supporting fixed restorations; however, only 56% were preceded by screw loosening. Although further investigations are needed to fully explore the characteristics and causes of this rare complication, it can be concluded that no more than 2.8% of implants fracture is within a mean loading period of 8.3 years.