The impact of diabetes on dental implant failure: a systematic review and meta-analysis

The aim of this study was to investigate the hypothesis that there is no difference in implant failure rate or marginal bone loss between type 1 or 2 diabetes subjects and non-diabetic subjects. An electronic search was conducted, without restrictions on date or language, in the PubMed/MEDLINE, Cochrane Central Register of Controlled Trials, Web of Science, and EMBASE databases, and in the grey literature, through August 2015. The eligibility criteria included prospective and retrospective cohort studies and randomized controlled trials. The initial search resulted in 1093 titles from PubMed/MEDLINE, 164 from the Cochrane Central Register of Controlled Trials, 134 from Web of Science, 228 from EMBASE, and four from the grey literature. Following the search and selection process, 14 studies published between 2000 and 2015 were included in this systematic review. According to the risk of bias analysis, all studies were classified as high quality. The results of this systematic review suggest that the number of implant failures does not differ between diabetic and non-diabetic subjects. Additionally, the results of the comparison between type 1 and 2 diabetes subjects showed no difference in the number of failures. With regard to marginal bone loss, there was a statistically significant difference favouring non-diabetic subjects.