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(1) Background: Ozone (O3) proved to oxidize organic and inorganic compounds, and its efficacy against bacteria, viruses and fungi plasma membranes was of interest. Ozone vehicle can be a gaseous form, ozonated water or ozonized oil. The aim of this in-vitro study was to evaluate the efficacy of ozonated olive oil against Streptococcus mutans . (2) Methods: Two different commercial mouthwashes were tested: Ialozon Blu (IB) (Gemavip, Cagliari, Italy), with ozonated olive oil, and Ialozon Rose (IR) (Gemavip, Cagliari, Italy), with ozonated olive oil, hyaluronic acid and vitamin E. All formulates were analyzed in a dilution range from 2- to 256-folds in saline solution, as to reproduce the salivary dilution. Streptococcus mutans CIP103220 strain was used for the antimicrobial susceptibility test, and the Kirby-Bauer inhibition method was performed to evaluate the Minimum Inhibitory (MIC), Minimum Bactericidal (MBC), and Minimum Biofilm Inhibitory Concentration (MBIC). (3) Results: Both formulates showed the same antimicrobial activity. MIC, MBC, and MBIC were observed for dilution factors of 1/32, 1/8 and 1/8, respectively. The mean value of inhibition zone diameter was 16.5 mm for IB, and 18 mm for IR. (4) Conclusions: The results suggested that ozonized olive oil formulates were able to inactivate Streptococcus mutans avoiding the salivary dilution effect in the oral cavity.

Purpose: It has been customary to explain the dentally beneficial effects of xylitol and certain other natural compound as lysozyme and seas salt in terms of microbiological effects only. Several studies have tested the use of natural ingredients, alcohol and fluoride free, in mouthwashes. The purpose of this study was to evaluate a combined mouthwash formulation containing natural antibiofilm agents in oral care wound healing after routinely oral surgery (extraction) procedures., Methods: Patients were assigned following a blinded randomized controlled trial and divided into two groups, an experimental group (I = 15) and a control (placebo) group (II = 15). Any infectious complications, wound healing, plaque accumulation in the stitches, and presence of trismus and inflammation were evaluated at ten and thirty days after extraction procedure. Pain and swelling were evaluated using the well-known visual analogue scale (VAS) scale throughout study period following extraction. The mean difference in Pre and Post values were compared among the groups. The change in pre-post score was analyzed using the paired t test., Results: An appreciable wound healing was seen in the experimental group when compared to the control sites, with no reported adverse effects. Four weeks postoperative patient's satisfaction level, to subjective and objective outcome measurements in documenting the result of a mouthwash treatment showed an interesting difference between groups., Conclusions: Since combined mouthwash formulations, containing natural/bioactive substances, could provide a cheap, safe and acceptable alternative in oral care, further studies will also be required to study these effects and their mechanism of action in detail.