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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN:
Vol. 14, No. 2, 2015, pp. 154-158
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Bioline Code: os15026
Full paper language: English
Document type: Research Article
Document available free of charge
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Brazilian Journal of Oral Sciences, Vol. 14, No. 2, 2015, pp. 154-158
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Dental bleaching agents with calcium and their effects on enamel microhardness and morphology
Pizani, Andréia Mara Andrade; Tholt, Beatriz; Paciornik, Sidnei; Dias, Katia Regina Hostilio Cervantes; de Albuquerque, Pedro Paulo Albuquerque Cavacanti & Queiroz, Celso Silva
Abstract
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.
Keywords
bleaching agents; calcium; hydrogen peroxide; dental enamel
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