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Year : 2017  |  Volume : 6  |  Issue : 2  |  Page : 92-98

Influence of whitening toothpaste on color, roughness, and microhardness of composite resins

Department of Restorative Dentistry, Institute of Science and Technology, Sao Paulo State University - UNESP, São José dos Campos, São Paulo, Brazil

Correspondence Address:
Tânia Mara da Silva
Avenida Engenheiro Francisco José Longo, 777, Jardim São Dimas, São José dos Campos, 12245-000, São Paulo
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/ejgd.ejgd_129_16

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Aims: This study aimed to evaluate color stability (ΔE), surface roughness (Ra), and Knoop microhardness (KHN) of composite resins under simulated toothbrushing with whitening toothpastes and desensitizing toothpaste. Methodology: One hundred disks were made with composite resins: Filtek Z350 XT (3M/ESPE) and Grandio SO (VOCO) and divided into five subgroups: AS (Control I) - immersed in artificial saliva; CS (Control II) - immersed in coffee solution; LW - brushing with Colgate Luminous White; OD – brushing with Oral-B 3D White; and SP - brushing with Sensodyne Total Protection, as control. The LW, OD, and SP groups had the disks brushed daily with 120 cycles after immersion in coffee solution (10 min) for a period of 30 days. ΔE, Ra, and KHN were obtained at baseline and after the treatments. Data were analyzed by ANOVA and Tukey's tests (P < 0.05). Student's t- test and Bonferroni test were performed to compare variables. Results: ANOVA revealed significant differences for ΔE, Ra, and KHN. ΔE: the highest ΔE mean values for Filtek were presented by SP group. For Grandio, the highest values were presented by SP and CS. Ra: Both composite resins presented similar behavior, with the highest mean values for groups AS and CS. KHN: The groups OD and SP made the most alteration on the surface, reducing the KHN values. Conclusions: Whitening toothpaste and immersion in coffee influenced on color stability, surface roughness, and microhardness of composite resins.

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