COMPARATIVE EVALUATION OF AMINE FLUORIDE, CALCIUM SODIUM PHOSPHOSILICATE (NOVAMIN), NANO HYDROXY APATITE CONTAINING DENTRIFICES ON ENAMEL MICROHARDNESS: AN IN VITRO STUDY

Abstract

Aim: To evaluate and compare the microhardness of enamel surface after the application of fluoride, novamin, and hydroxyapatite containing dentifrices. Materials and Methods: Twenty freshly extracted premolars were collected and decoronation of all the teeth was done at cementoenamel junction. The crowns were sectioned mesiodistally into two halves with the help of diamond disc, and then the subsequent forty samples kept in 1% citric acid for the demineralization in an incubator at 350C temperature for 72 hours. The samples were randomly divided into four groups of 10 samples in each group, that is, Group A(Control Group), Group B (sodium fluoride dentifrice), Group C(Novamin dentifrices) and Group D(Hydroxyapatite dentifrices), Groups B, C & D were treated using prepared dentifrices slurries for 3 min daily, twice for 7 days at room temperature. The samples were preserved in artificial saliva in between treatment. The enamel surface microhardness was evaluated using Vickers hardness test at base level, after demineralization, as well as after remineralization. Statistical analysis of surface microhardness obtained at different stages was done by Student's t-test and P < 0.05 was considered statistically significant. Result: Group B C & D showed significant increase in microhardness as compare to Group A. Conclusion: nHAP based dentifrices showed greater increase in microhardness as compare to other groups.