Biomimetic Effect of Nano-Hydroxyapatite in Demineralized Enamel before Orthodontic Bonding of Brackets and Attachments: Visual, Adhesion Strength, and Hardness in In Vitro Tests

Figure 1

Microphotographs of a specimen during the different times. Freshly extracted tooth (t0); sample after demineralization (t1); sample after first remineralization cycle (t2); sample after second remineralization cycle (t3); sample after third remineralization cycle (t4).

(a)

(b)

(c)

(d)

(e)