Dentifrices comprising biogenic silica materials
Unique dentifrices comprising unique abrasive biogenic silica materials are provided. Such compositions exhibit excellent abrasive characteristics, either alone, or in combination with other types of abrasives. In such combinations (with precipitated silica materials, as one example), simultaneously high pellicle film cleaning properties and moderate dentin abrasion levels are possible in order to accord the user a dentifrice that effectively cleans tooth surfaces without detrimentally abrading such surfaces, even at low levels of such biogenic silica additives. Such biogenic silica particles thus surprisingly accord beneficial properties within dentifrice compositions. Encompassed within this invention is the method of utilizing such biogenic silica products within dentifrices, either as the majority abrasive component, or in combination with any other type of commonly used abrasive material.
1 . A dentifrice comprising a rice hull derived silica abrasive and optionally including any other dental abrasive component, wherein said dentifrice exhibits a PCR:RDA in excess of 0.70 up to 0.80.
2 . The dentifrice of claim 1 wherein another dental abrasive component is present.
3 . The dentifrice of claim 2 wherein said other dental abrasive component is selected from the group consisting of precipitated silica products, silica gels, precipitated calcium carbonate, ground calcium carbonate, chalk, magnesium carbonate, dicalcium phosphate and its dihydrate forms, calcium pyrophosphate, zirconium silicate, potassium metaphosphate, magnesium orthophosphate, tricalcium phosphate, perlite, and any mixtures thereof.
4 . The dentifrice of claim 3 wherein said other dental abrasive component is a precipitated silica product.
5 . The dentifrice of claim 2 wherein the total amount of abrasives present within said dentifrice is up to 30% by weight therein, and wherein said rice hull derived silica is present in an amount of up to 25% by weight therein.
6 . The dentifrice of claim 3 wherein the total amount of abrasives present within said dentifrice is up to 30% by weight therein, and wherein said rice hull derived silica is present in an amount of up to 25% by weight therein.
7 . The dentifrice of claim 4 wherein the total amount of abrasives present within said dentifrice is up to 30% by weight therein, and wherein said rice hull derived silica is present in an amount of up to 25% by weight therein.