Zinc-Containing Hydroxyapatite Enhances Cold-Light-Activated Tooth Bleaching Treatment In Vitro

Figure 3

XRD patterns of dental enamel specimen before/after bleaching and pH cycling treatment. (a) Group HA. (b) Group Zn-HA. (c) Group DW. “HA” and “CHA” refer to “hydroxyapatite” and “carbonated hydroxyapatite,” respectively.

(a)

(b)

(c)