[Effectiveness of local delivery of ofloxacin using controlled-release strips (PT-01) in periodontal patients. Part 2. Successive delivery system and combination with scaling].

Four different sites were randomly selected in each periodontal patient and divided into four group: PT-01-treated site (A), PT-01 treatment combined with scaling (S + A), placebo-treated site (P) and placebo treatment combined with scaling (S + P). PT-01 and the placebo were applied to the periodontal pocket weekly on days 0 to 28, and clinical and microbiological evaluations were made. The results obtained were as follows: 1. Weekly changes in plaque index, plus discharge and mobility of the tooth were not observed in any group. 2. In gingival index, bleeding on probing, pocket depth and gingival crevicular fluid, significant improvement was found in A in comparison with P and in S + A in comparison with S + P. 3. In total number of subgingival bacteria and in the ratio of motile rods and spirochetes to the total number of bacteria, significant reduction was found in A in comparison with P and in S + A in comparison with S + P.