Dental bleaching agents with calcium and their effects on enamel microhardness and morphology

Brazilian Journal of Oral Sciences

Andréia Mara Andrade Pizani¹  Beatriz Tholt¹  Sidnei Paciornik¹  Katia Regina Hostilio Cervantes Dias¹  Pedro Paulo Albuquerque Cavacanti De Albuquerque¹  Celso Silva Queiroz¹ 

关键词: bleaching agents;    calcium;    hydrogen peroxide;    dental enamel;   

DOI  :  10.1590/1677-3225v14n2a11

来源: SciELO

【 摘 要 】

To evaluate enamel microhardness and morphology after bleaching with hydrogen peroxide containing calcium in different concentrations. 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. 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. Calcium in association with a higher hydrogen peroxide concentration may decrease microhardness changes on enamel.

【 授权许可】

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