Use of narrow-diameter implants in the posterior jaw: a systematic review

Evidence is limited on the efficacy of narrow-diameter implants (NDIs) in the posterior jaw. The purpose of this systematic review was to assess the survival of NDIs and provide guidelines for their safe use. Electronic search of the English-language literature enriched by hand search to identify suitable publications was made. Only peer-reviewed clinical studies published from January 1990 through March 2014 were included. Seventeen studies with a total of 1644 implants met the inclusion criteria, with an observation period from 1 up to 12 years. The mean survival rate of 98.6% was reported. Technical and other complications were observed. Short-term clinical data suggest that NDIs may serve in the posterior jaw as an alternative to standard-diameter implants. However, certain clinical conditions must be observed to assure long-term success.