Publication date: Available online 6 June 2016
Source:Archives of Oral Biology
Author(s): K.M. Salli, S.D. Forssten, S.J. Lahtinen, A.C. Ouwehand
ObjectivesIn vitro methods to study dental biofilms are useful in finding ways to support a healthy microbial balance in the oral cavity. The effects of sucrose, xylitol, and their combination on three strains of Streptococcus mutans and one strain of Streptococcus sobrinus were studied using a dental simulator.MethodsA simulator was used to mimic the oral cavity environment. It provided a continuous-flow system using artificial saliva (AS), constant temperature, mixing, and hydroxyapatite (HA) surface in which the influence of xylitol was studied. The quantities of planktonic and adhered bacteria were measured by real-time qPCR.ResultsCompared against the untreated AS, adding 1% sucrose increased the bacterial colonization of HA (p<0.0001) whereas 2% xylitol decreased it (p<0.05), with the exception of clinical S. mutans isolate 117. The combination of xylitol and sucrose decreased the bacterial quantities within the AS and the colonization on the HA by clinical S. mutans isolate 2366 was reduced (p < 0.05). Increasing the concentration (2% − 5%) of xylitol caused a reduction in bacterial counts even in the presence of sucrose.ConclusionsThe continuous-culture biofilm model showed that within a young biofilm, sucrose significantly promotes whereas xylitol reduces bacterial colonization and proliferation. The results indicate that xylitol affects the ability of certain S. mutans strains to adhere to the HA. Clinical studies have also shown that xylitol consumption decreases caries incidence and reduces the amount of plaque. This study contributes to the understanding of the mechanism behind these clinical observations.
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Δευτέρα 6 Ιουνίου 2016
Influence of sucrose and xylitol on an early Streptococcus mutans biofilm in a dental simulator
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