Objectives: The role of antibiotics as an adjunct to nonsurgical peri-implantitis treatment approaches has not reached a consensus. This meta-analysis aimed to review the adjunctive effect of systemic use of metronidazole and amoxicillin in patients with peri-implantitis.
Method and materials: PubMed, Embase, and the Cochrane Library were searched for randomized controlled trials published from inception to January 2023.
Results: A total of five clinical trials with a total of 211 patients were included in the analyses. No significant difference was found in the reduction of probing pocket depth at 3 and 6 months of follow-up (3 months: weighted mean difference [WMD] = −0.336, 95% CI −0.966 to 0.233, P = .231; 6 months: WMD = −0.533, 95% CI −1.654 to 0.587, P = .351). A statistically significant difference was found at 12 months of follow-up (WMD = −1.327, 95% CI −1.803 to −0.852, P < .001) between the treatment and control groups. The combined results indicated that the differences in reduction of bleeding on probing, Plaque Index score, and bone level at 6 months of follow-up were significant (P < .05).
Conclusion: The study demonstrated that the adjunctive use of systemic metronidazole and amoxicillin did not significantly improve probing pocket depth compared to nonsurgical treatment alone, and should not be routinely recommended. However, the significant reductions in bleeding on probing, Plaque Index, and bone level at 6 months may indicate a potential effect of treating peri-implantitis with adjunctive systemic metronidazole and amoxicillin.