This journal only 2010, Number 2 Rev ADM 2010; 67 (2) Valoración clínica de una goma de máscar con xilitol (Trident val-u-pack) Portilla RJ, Domínguez LG, Gaitán CLA, Gutiérrez VG, Pinzón TME, León AJ, Sánchez HF Full text How to cite this article Language: Spanish References: 29 Page: 65-71 PDF size: 491.29 Kb. Key words: Chewing Gum, Xylitol, Caries, Biofilm, Gingival Bleeding. ABSTRACT According to the literature, Xylitol has certain anti-dental biofilm properties, primarily, an ability to impede its formation, whilst inhibiting the reproduction of cariogenic bacteria and their capacity to adhere to enamel; when used in chewing gum, it can be a contributing factor in the prevention of dental caries and gingivitis. It is the most studied artificial sweetener, yet opinions as to its effects are divided. To the best of our knowledge, no studies that take into account geographical, genetic and dietary differences or variations in customs and environment have been published in Mexico. A randomized, clinical, double-blind study was carried out amongst student volunteers at the Faculty of Dentistry of Mexico’s UNAM university, which included a control group who stopped brushing their teeth for a period of seven days, and a test group of students who, in addition, used a chewing gum containing Xylitol (TRIDENT VAL-U-PACK®). Probing for gingival bleeding in the experimental group showed, at day 0, an average value of 10.31%, and at day 7, a value of 26.45%, representing a 64.2% increase; meanwhile, the corresponding values for the control group were 9.56% at day 0, and 24.45% at day 7, i.e. an increase of 176.6%, and a difference of 112% between the two groups. The difference in biofilm accumulation was even more marked: in the control group an increase of 17.94% was observed, whereas in the experimental group there was actually a reduction of 4.6%. No significant differences were observed in microorganism colony count (UFC) or in the pH values of saliva. 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