Abstract
Statement of problem
Consensus is lacking regarding the optimal number of implants for supporting complete-arch
prostheses with good survival rates and lower prosthetic complications and marginal
bone loss.
Purpose
The purpose of this systematic review was to evaluate the influence of the number
of implants used for complete-arch prostheses with at least 5 years of follow-up.
Material and methods
A search was performed in the PubMed/MEDLINE, Scopus, and Cochrane Library databases
according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses
(PRISMA) criteria and was registered in The International Prospective Register of
Systematic Reviews (CRD42016048468). The following was the population, intervention,
comparison, outcome (PICO) question: Does the number of implants influence the longevity
of complete-arch prostheses?
Results
Nineteen studies including 1006 patients with a mean age of 61.44 years were selected
for evaluation. The number of implants per jaw ranged between 2 and 9 in the maxilla,
mandible, or both jaws. For implant survival rate in complete-arch prostheses with
fewer than 5 implants per jaw, the pooled weighted event rate was 1.4% (I2=25.26%; P=.211) and 4.2% (I2=81.35%; P<.001) for complete arches with more than 4 implants per jaw. For the prosthesis survival
rate, the pooled weighted event rate for a complete-arch with fewer than 5 implants
per jaw was 1.5% (I2=0%; P=.677) and 9% (I2=17.33%; P=.304) for complete arches with more than 4 implants per jaw. For prosthesis complications
for complete arches with fewer than 5 implants per jaw, the pooled weighted event
rate was 19.9% (I2=93.5%; P<.001) and 24.5% (I2=88.89; P<.001) for complete arches with more than 4 implants per jaw. The mean marginal bone
loss for complete arches with fewer than 5 implants per jaw was 1.22 ±0.49 mm (I2=99.46; P<.001) and 1.46 ±0.46 mm (I2=99.6; P <.001) for more than 4 implants per jaw.
Conclusions
The current systematic review indicated no relationship of the number of implants
used to support a complete-arch prosthesis with implant survival rate, prosthesis
survival rate, prosthesis complications, or marginal bone loss in studies with follow-up
periods of between 5 and 15 years.
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Article info
Publication history
Published online: December 04, 2018
Identification
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© 2018 by the Editorial Council for The Journal of Prosthetic Dentistry.
