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Dental bleaching agents with calcium and their effects on enamel microhardness and morphology
Remote (Português (Brasil))


Bleaching agents
Hydrogen peroxide
Dental enamel

How to Cite

Pizani AMA, Tholt B, Dias KRHC, Albuquerque PPAC de, Queiroz CS. Dental bleaching agents with calcium and their effects on enamel microhardness and morphology. Braz. J. Oral Sci. [Internet]. 2015 Jul. 1 [cited 2023 Sep. 21];14(2):154-8. Available from:


Aim: To evaluate enamel microhardness and morphology after bleaching with hydrogen peroxide containing calcium in different concentrations. Methods: One hundred specimens of human teeth were ground and polished and had the initial microhardness evaluated. The specimens were randomly assigned into five groups (n=20): Group 1 - Control group (no treatment); Group 2 - Home Peroxide 6% (without calcium); Group 3 - Home Peroxide 7.5% (without calcium); Group 4 - White Class 6% (with calcium); Group 5 - White Class 7.5% (with calcium). For each group, the bleaching was performed according to the manufacturer’s specifications. The specimens were bleached once a day for 5 days and subjected to pH cycling. Microhardness and scanning electron microscopy (SEM) analysis were performed before and after bleaching. Results: The results showed that groups submitted to bleaching treatment presented hardness loss compared to the control group. The group of 7.5% hydrogen peroxide with calcium showed a lower percentage of hardness loss in relation to other groups. Conclusion: Calcium in association with a higher hydrogen peroxide concentration may decrease microhardness changes on enamel.
Remote (Português (Brasil))

The Brazilian Journal of Oral Sciences uses the Creative Commons license (CC), thus preserving the integrity of the articles in an open access environment.


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