Effect of Nanohydroxyapatite Incorporation in Hydrogen Peroxide Bleaching Agent on Color, Microhardness, and Microscopical Features of Dental Enamel
DOI:
https://doi.org/10.18502/fbt.v13i3.22742Keywords:
Bleaching; Enamel; Hydrogen Peroxide; Microhardness; Morphological Changes; Nanohydroxyapatite.Abstract
Purpose: The present study aimed to evaluate the effectiveness of incorporating nanohydroxyapatite into hydrogen peroxide bleaching material on color, microhardness, and morphological features of dental enamel.
Materials and Methods: 33 sound maxillary first premolar were used for the study. Enamel blocks (7mm× 5mm×3mm) were prepared from the middle third of the buccal halves of each tooth. Each dental block was embedded in self-curing acrylic resin with an exterior enamel surface exposed for various applications. The dental blocks were randomly divided into three groups (n=11) according to the bleaching technique. The groups were designed as follows: control; Hydrogen Peroxide (HP) and hydrogen peroxide with nanohydroxyapatite (HP-nHAp) groups. Color measurements and microhardness tests were conducted before and after treatment using the Vita Easy Shade spectrophotometer and Vickers hardness test, respectively. One sample representing each group was selected for morphological analysis using scanning electron microscope.
Results: The results showed that both HP and HP-nHAp groups induced color changing. Enamel microhardness loss of the HP group was significantly higher than that of the HP-nHAp and control groups. The enamel morphological changes were only observed in the HP group.
Conclusion: nHAp could significantly reduce the enamel microhardness loss caused by HP while preserving enamel surface morphological features without affecting bleaching efficacy.
