Comparison of the Rate of Demineralization of Enamel using Synthetic Polymer Gel

Carbopol 907 used as surface protecting agent in White’s method is the one of the artificial caries lesion producing solution was discontinuing of production. New surface protecting material to substitute of Carbopol 907 was required. The author prepared an artificial caries lesion producing solution as follows White’s method with Carbopol 907 and also another artificial caries lesion producing solution with Carbopol 2050. 96 flattened and polished enamel samples were immersed in a demineralizing solution of 0.1 mol/L lactic acid, 0.2% carboxyvinylpolymer and 50% saturated hydroxyapatite for 1, 2, 3, 4, 5, 6, 7, 9, 11, 15, 18 and 20 days. All samples from each group were subjected to polarized microscopy observed and image analysis for measuring the lesion depth. From the review of polarized images, the artificial caries lesion producing solution using Carbopol 907 and Carbopol 2050 can produced an artificial caries that was very similar to natural caries characters. From the regression analysis of the lesion depth produced by the artificial caries lesion producing solution using Carbopol 907 and Carbopol 2050, Carbopol 2050 estimate as Y = 9.8X + 8.0 and Carbopol 907 was Y = 8.4X – 0.4. R square value of Carbopol 2050 and Carbopol 907 was 0.965 and 0.945 respectively. The rate of demineralization by the artificial caries lesion producing solution using Carbopol 2050 was faster than that of Carbopol 907. And R square value of Carbopol 2050 and Carbopol 907 were very high and it means that the lesion depth was very high coefficient to demineralization period.