Short Dental Implants (≤7mm) Versus Longer Implants in Augmented Bone Area: A Meta-Analysis of Randomized Controlled Trials

Priscila N. Uehara1, *, Victor Haruo Matsubara2, Fernando Igai1, Newton Sesma1, Marcio K. Mukai1, Mauricio G. Araujo3
1 Department of Prosthodontics, School of Dentistry, University of Sao Paulo, Sao Paulo, Brazil
2 Dental School, Oral Health Centre of Western Australia, The University of Western Australia, Perth, WA, Australia
3 Department of Dentistry, State University of Maringa, Parana, Brazil

Article Metrics

CrossRef Citations:
Total Statistics:

Full-Text HTML Views: 508
Abstract HTML Views: 136
PDF Downloads: 98
ePub Downloads: 42
Total Views/Downloads: 784
Unique Statistics:

Full-Text HTML Views: 273
Abstract HTML Views: 109
PDF Downloads: 88
ePub Downloads: 40
Total Views/Downloads: 510

Creative Commons License
© 2018 Uehara et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Prosthodontics, School of Dentistry, University of Sao Paulo, Avenida Professor Lineu Prestes, 2227, São Paulo, Brazil; Tel: 551130917888; E-mail:



The aim of this systematic review was to compare the survival rate and the marginal bone loss between short implants (≤7 mm) placed in the atrophic area and longer implants placed in the augmented bone area of posterior regions of maxillaries.


Electronic search using three databases was performed up to May 2017 to identify Randomized Controlled Trials (RCT) assessing short implants survival with a minimal follow-up of 12 months post-loading. For the meta-analysis, a Risk Difference (RD) with the 95% Confidence Interval (CI) was used to pool the results of implant failure rate for each treatment group. For the marginal bone changes, Mean Differences (MD) with 95% CI were calculated.


Seven randomized controlled trials met the inclusion criteria, being included in qualitative and quantitative analyses. The RD between the short implant group and the control group was -0.02 (95% CI: -0.04 to 0.00), I2=0 and Chi2=3.14, indicating a favorable survival rate for short implant, but with no statistical significance (p=0.09).


For marginal bone loss, the mean difference was -0,13 (95%CI: -0.22 to -0.05), favoring the test group with statistical significance (p=0.002). The studies showed more heterogeneity for bone loss compared to survival rate. Short and longer implants showed similar survival rates after one year of loading, however the marginal bone loss around short implants was lower than in longer implants sites.


Placement of implants ≤7 mm of length was found to be a predictable alternative for the rehabilitation of atrophic posterior regions, avoiding all the disadvantages intrinsic to bone augmentation procedures.

Keywords: Dental implants, Survival rate, Bone tissue, Meta-analysis, Systematic review, Clinical trial.