| 摘要 |
Oral compositions, such as oral gels and toothpastes, containing a novel abrasive. A dentrifice composition, comprising: A) a precipitated silica abrasive composition, comprising: a) a precipitated silica, comprising particles wherein said particles have: i) a mean particle size of from 5 to 11 microns (s.d. < 9); ii) an Einlehner hardness of from 0.8 to 2.5 for abrasive to brass screen and from 5 to below 8 for abrasive to polyester screen; iii) an oil absorption of from 95 ml/100 gm to 135 ml/100 gm; and iv) a radioactive dentin abrasion of from 25 to below 80; and b) a precipitated silica, comprising particles wherein said particles have: i) a mean particle size of from 5 to 11 microns (s.d. < 9); ii) an Einlehner hardness of from 3 to 8 for abrasive to brass screen and from 8 to 11 for abrasive to polyester screen; iii) an oil absorption of from 70 ml/100 gm to below 95 ml/100 gm; and iv) a radioactive dentin abrasion of from 80 to 200 wherein at least 70% of all of said particles have a diameter of below 25 microns and wherrein the pellicle cleaning ratio is from 90 to 135 and the radioactive dentin abrasion is from 60 to 100 with a pellicle cleaning ratio/radioactive dentin abrasion ratio of from 1.25 to 1.75 and wherein the ratio of the silica in a) to the silica in b) is from 90:10 to 40:60, respectively; and B) from 0.1 % to 99 % of an orally-acceptable dentifrice carrier.
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