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Evaluation Studies
Journal Article
Development of an enhanced anticaries efficacy dual component dentifrice containing sodium fluoride and dicalcium phosphate dihydrate.
American Journal of Dentistry 2001 May
A dual-chamber dentifrice, which contains sodium fluoride (NaF) in one component and dicalcium phosphate dihydrate (dical) in the other, has been developed. The dentifrice is packaged in a dual-chamber tube and is formulated to deliver 1100 ppm F. A series of studies consisting of in vitro fluoride uptake, in vivo calcium labeling, intraoral remineralization-demineralization, and animal caries studies were performed to support the improved anticaries efficacy of this product in comparison to a sodium fluoride/silica dentifrice (NaF/silica). An in vitro fluoride uptake study comparing 1100 ppm F NaF/dical dentifrice to 1100 ppm F NaF/silica showed that NaF/dical delivered significantly more fluoride than NaF/silica, 3.72 +/- 0.36 micrograms/cm2 versus 2.41 +/- 0.10 micrograms/cm2. A 6-day in vivo brushing study with a 44Ca labeled NaF/dical dentifrice showed that calcium from dical penetrated demineralized enamel and was present in plaque up to 18 hrs since the last brushing. An intra-oral remineralization-demineralization study was performed to evaluate NaF/dical's ability to promote remineralization in comparison to three silica-based dentifrices containing 0, 250, and 1100 ppm F as NaF. The percent mineral changes after treatment were +20.44 +/- 17.14 for NaF/dical, +9.27 +/- 19.53 for 1100 ppm NaF/silica, -1.43 +/- 20.57 for 250 ppm NaF/silica, and -12.36 +/- 32.76 for 0 ppm F/silica. A statistical analysis showed that the dual-chamber NaF/dical dentifrice was significantly more effective than the 1100 ppm NaF/silica dentifrice at promoting remineralization. A rat caries study was performed to evaluate NaF/dical ability to prevent caries in comparison to 1100 ppm F NaF/silica, 250 ppm F NaF/silica, silica, and dical dentifrices. The mean smooth surface caries scores were 1.6 +/- 2.8 for NaF/dical, 5.5 +/- 6.2 for 1100 ppm F NaF/silica, 10.6 +/- 6.2 for 250 ppm F NaF/silica, 13.7 +/- 4.7 for 0 ppm F/silica, and 9.5 +/- 7.8 0 ppm F/dical. A statistical analysis showed that the the dual-chamber NaF/dical dentifrice was superior to all other treatments tested in preventing caries in rats. The dical dentifrice was significantly superior to the silica dentifrice in preventing caries, which indicates that dical alone exhibits anticaries efficacy. In conclusion, individual and cumulative results from the fluoride uptake, intra-oral remineralization-demineralization, and rat caries studies from the dual chamber NaF/dical dentifrice support the improved anticaries efficacy of this product.
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