Baseline microhardness values for enamel in this study ranged from 260 to 279 VHN. These values are similar as in a study by Meredith et al.17, but lower than the value reported by Maupome et al. Our study design required a sufficiently flat and large area to enable 12 indentations. Thus the area subjected to erosion was not the original surface enamel, and potentially more susceptible to erosion. Microhardness decreases from the outer enamel surface toward the dentinoenamel junction17, which explains our low baseline values. In the present study, the baseline and post-immersion
measurements for each specimen were carried out in the same plane. Dentine microhardness, ranging from 46 to 53 VHN, is similar to previous studies.18,19 Microhardness of tooth-coloured filling materials were also in the same range as values
reported by other investigators.15
Baseline microhardness values for enamel in this study ranged from 260 to 279 VHN. These values are similar as in a study by Meredith et al.17, but lower than the value reported by Maupome et al. Our study design required a sufficiently flat and large area to enable 12 indentations. Thus the area subjected to erosion was not the original surface enamel, and potentially more susceptible to erosion. Microhardness decreases from the outer enamel surface toward the dentinoenamel junction17, which explains our low baseline values. In the present study, the baseline and post-immersionmeasurements for each specimen were carried out in the same plane. Dentine microhardness, ranging from 46 to 53 VHN, is similar to previous studies.18,19 Microhardness of tooth-coloured filling materials were also in the same range as valuesreported by other investigators.15
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