Microflora cultivable from minocycline strips placed in persisting periodontal pockets

Summary Objective: The microflora that develops on minocycline strips, used as an adjunct in non-surgical periodontal therapy was studied. Design and methods: Minocycline (1.4 mg in polycaprolactone vehicle) and control strips were applied into all residual pockets (PD ≥ 5 mm, ≥2 pockets/subject) of patients with chronic periodontitis 1 month after a course of non-surgical periodontal therapy. Strips were inserted and retained for 3 days, changed to new strips for 3 more days and then removed. Strips were recovered from 14 (eight test, six control) of the 34 participants at day 0 (strip inserted, left for 30 s, removed), days 3 and 6, for (i) anaerobic culture, (ii) coliforms culture, using MacConkey agar, (iii) yeast culture, using Sabouraud's dextrose agar. Results: The mean anaerobic cfu/strip (×10 5 ; control/test) were 2/6, 24/2, 11/2 at days 0, 3 and 6, respectively ( P > 0.05). The corresponding mean proportion of Gram-negative rods and fusiforms were 27%/21%, 27%/15% and 55%/8%. The proportions of Gram-negative rods on test strips by day 6 were significantly reduced ( P Streptococcus mitis biovar 1 was found on spent test strips (control versus test; 0% versus 38%, Fisher exact test, P = 0.01). Coliform prevalence at days 0, 3 and 6 on control/test strips were 0/13%, 50%/38% and 50%/13%. Yeasts were occasionally isolated. Conclusions: The findings indicated that the minocycline strips but not the control strip supported a microbial colonisation compatible with periodontal health by day 6.