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Lovatto ST et al. J Prosthodont 2018; 10.1111/jopr.12790.

This systematic review assessed the influence of different implant geometries on clinical longevity and maintenance of marginal bone tissue. An electronic search was conducted on MEDLINE, Scopus and Web of Science databases. Only randomised controlled trials that compared dental implants and their geometries were included. Two reviewers independently selected studies, extracted data and assessed the risk of bias. From the ten studies that were included, a similar behaviour of marginal bone loss between tapered and cylindrical geometries was observed. However, implants that had micro‐threads in the neck presented with a slight decrease of marginal bone loss compared to implants with a straight or smooth neck. Success and survival rates were high, with cylindrical implants presenting higher success and survival rates than tapered ones. However, the evidence in this systematic review was classified as very low due to limitations such as study design, sample size and publication bias. Therefore, the authors suggest more well‐designed RCTs should be conducted to provide evidence regarding the influence of implant geometry on marginal bone loss and survival and success rates after one year of implant placement.