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  • Title: Comparative staining in vitro and plaque inhibitory properties in vivo of 0.12% and 0.2% chlorhexidine mouthrinses.
    Author: Smith RG, Moran J, Addy M, Doherty F, Newcombe RG.
    Journal: J Clin Periodontol; 1995 Aug; 22(8):613-7. PubMed ID: 8583018.
    Abstract:
    The mere incorporation of an active ingredient in an oral hygiene product does not necessarily guarantee efficacy. As new formulations appear, it would seem prudent to at least screen for activity by comparison with an established product. The aim of this study was to compare a new 0.12% chlorhexidine containing rinse with a well researched 0.2% chlorhexidine rinse product. The rinses were firstly compared in vitro for dietary staining effects and in vivo for plaque inhibition. Both formulations in vitro produced progressive staining of acrylic specimens with increasing passages through a standard tea solution. The clinical investigation was a 3-treatment, randomised, double blind, crossover, 4-day plaque regrowth study, balanced for 1st and 2nd order residual effects and involving 24 volunteers. From a zero plaque baseline, volunteers suspended oral hygiene and rinsed 2 x per day with the allocated rinse. The chlorhexidine doses were 18 mg and 20 mg per rinse for the 0.12% and 0.2% formulations, respectively. Plaque was scored by area and index on day 5. The results showed that the 2 chlorhexidine rinses were similar in efficacy by comparison with the control rinse. These studies in vitro and in vivo indicate that the chlorhexidine in the new preparation is available and active and the product could find use in those preventive applications suggested for other chlorhexidine formulations.
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