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    Comparing the enamel hardness by using mi varnish™ with recaldent™ before and after bracket bonding
    (Universidad Privada Norbert Wiener, 2024-05-10) Rojas Foronda, María Rosario; Céspedes Porras, Jacqueline
    The objective of this study was to compare the hardness of enamel with and without MI Varnish (Recaldent) before and after bracket bonding. An experimental, quantitative, and longitudinal study was conducted, comprising 40 teeth in artificial saliva divided into four groups of ten each. The first group did not receive MI Varnish, while the second group did. Both groups were subjected to 500 thermal cycling cycles. A third group was treated without MI Varnish, and a fourth group with MI Varnish, both subjected to 1000 thermal cycling cycles. The Student's t-test was used. The results showed that after 500 cycles, the initial average hardness of the group without MI Varnish was 326.42 +/- 39.62 HV (kg/mm²), with a final average hardness of 226.42 +/- 35.18 HV (kg/mm²), meaning the enamel hardness decreased. The group with MI Varnish showed an initial average hardness of 310.28 +/- 41.13 HV (kg/mm²) and a final average hardness of 293.51 +/- 41.37 HV (kg/mm²). After 1000 cycles, the initial average hardness of the teeth without MI Varnish reached 307.98 +/- 39.62 HV (kg/mm²), and the final hardness was 230.33 +/- 47.83 HV (kg/mm²). The enamel hardness decreased more than after 500 cycles. The initial average hardness of the teeth with MI Varnish was 311.83 +/- 24.02 HV (kg/mm²), and the final hardness was 263.61 +/- 32.29 HV (kg/mm²). We concluded that after 500 cycles, the enamel hardness was greater with MI Varnish.