Comparative Evaluation of the Effect of Topical Fluoride on the Micro Hardness of Various Restorative Materials- an in Vitro Study
Introduction: Dental caries considered to be a multifactorial disease requires meticulous management and prevention. For prevention the most successful and commonly used agent is fluoride and if applied topically by means of APF gel it has a success rate of around 60%.
Aims and objectives: To evaluate and compare the micro hardness of the restorative materials after the application of APF gel. To evaluate the effect of topical fluoride on the micro hardness of various restorative materials using universal testing machine as well as to compare the micro hardness of the restorative materials after the application of APF gel.
Materials and methods: 80 standardized restorative pellets made with various restorative materials constituted the sample size for the evaluation of micro hardness with and without the application of APF gel on the prepared restorative pellets. The prepared 80 molds were equally distributed for the preparation of 20 restorative pellets of four restorative materials each (viz.) Glass Ionomer Cement, Zirconomer, Amalgomer, Cention-N. Out of 20 samples prepared 10 samples were considered as control, which were tested without the application of APF gel. While 10 samples were taken as experimental, which were conditioned with APF gel before the test.
Results: The result of the microhardness test after the application of fluoride gel showed that the highest microhardess was shown by Group III Amalgomer CR with mean 52.62 ± 0.65. The other materials in the order of decreasing hardness were Group IV Cention N 50.52 ± 0.69, Group II Zirconomer 46.80 ± 0.68 and least for Group I conventional Gic 43.38 ± 0.53. The percentage reduction of micro hardness after application of APF gel was recorded highest in GIC type IX followed by Amalgomer CR, Cention N and Zirconomer. Zirconomer has the least percentage reduction of micro hardness after application of APF gel amongst all the restorative materials.
Keywords: APF gel, Amalgomer CR, Cention N, micro hardness, topical fluoride, Zirconomer.
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