Local antimicrobials in addition to scaling and root planing provide statistically significant but not clinically important benefit.

DATA SOURCES: The databases Medline, Embase and the Cochrane Oral Health Group Trials Register were searched. Handsearching of the Journal of Periodontology, Journal of Clinical Periodontology and Journal of Periodontal Research was also carried out. STUDY SELECTION: Randomised controlled trials published in English were included. DATA EXTRACTION AND SYNTHESIS: Risk of bias and quality assessment were conducted following Cochrane recommendations with data being extracted independently in duplicate. Because of the nature of the available data, qualitative summary is presented with meta-analysis conducted where appropriate.
RESULTS: The overall effect of the subgingival application of antimicrobials was statistically significant (p = 0.000) for both changes in probing pocket depth (PPD) and clinical attachment level (CAL), with a weighted mean difference (WMD) of -0.407 and -0.310 mm respectively. No significant differences occurred for changes in bleeding on probing (BOP) and plaque index (PlI). Subgingival application of tetracycline fibres, sustained released doxycycline and minocycline demonstrated a significant benefit in PPD reduction (WMD between 0.5 and 0.7 mm). The rest of the tested outcomes demonstrated a high heterogeneity. The local application of chlorhexidine and metronidazole showed a minimal effect when compared with placebo (WMD between 0.1 and 0.4 mm).
CONCLUSIONS: In conclusion, the scientific evidence supports the adjunctive use of local antimicrobials to SRP in deep or recurrent periodontal sites, mostly when the vehicle has shown pharmacodynamic properties assuring the sustained release of the antimicrobial. This evidence must be interpreted with caution, as the reported data were highly heterogeneous and most of the selected studies were categorised with a high degree of bias.