Physical-chemical characteristics of whitening toothpaste and evaluation of its effects on enamel roughness

• Published in: Brazilian oral research Vol. 25; no. 4; pp. 288 - 294
• Main Authors: Hilgenberg, Sérgio Paulo, Pinto, Shelon Cristina Souza, Farago, Paulo Vitor, Santos, Fábio André, Wambier, Denise Stadler
• Format: Journal Article
• Language: English; Portuguese
• Published: Brazil Sociedade Brasileira de Pesquisa Odontológica - SBPqO 01.07.2011; Sociedade Brasileira de Pesquisa Odontológica
• Subjects: Analysis of Variance; Animals; Cattle; Dental Enamel; Dental Enamel - drug effects; Dentifrices; Dentistry; DENTISTRY, ORAL SURGERY & MEDICINE; Drug Combinations; Fluorides - chemistry; Fluorides - pharmacology; Hydrogen-Ion Concentration; Microscopy, Electron, Scanning; Nitrates - chemistry; Nitrates - pharmacology; Peroxides - chemistry; Peroxides - pharmacology; Phosphates - chemistry; Phosphates - pharmacology; Surface Properties; Time Factors; Tooth bleaching; Tooth Bleaching - methods; Tooth Bleaching Agents - chemistry; Tooth Bleaching Agents - pharmacology; Toothbrushing; Toothpastes - chemistry; Toothpastes - pharmacology; Treatment Outcome; Urea - analogs & derivatives; Urea - chemistry; Urea - pharmacology; Tooth bleaching; Toothbrushing; Dentifrices; Dental Enamel
• ISSN: 1807-3107; 1806-8324; 1807-3107
• DOI: 10.1590/S1806-83242011005000012

This in vitro study evaluated the physical-chemical characteristics of whitening toothpastes and their effect on bovine enamel after application of a bleaching agent (16% carbamide peroxide). Physical-chemical analysis was made considering mass loss by desiccation, ash content and pH of the toothpastes. Thirty bovine dental enamel fragments were prepared for roughness measurements. The samples were subjected to bleaching treatments and simulated brushing: G1. Sorriso Dentes Brancos (Conventional toothpaste), G2. Close-UP Whitening (Whitening toothpaste), and G3. Sensodyne Branqueador (Whitening toothpaste). The average roughness (Ra) was evaluated prior to the bleaching treatment and after brushing. The results revealed differences in the physical-chemical characteristics of the toothpastes (p < 0.0001). The final Ra had higher values (p < 0.05) following the procedures. The mean of the Ra did not show significant differences, considering toothpaste groups and bleaching treatment. Interaction (toothpaste and bleaching treatment) showed significant difference (p < 0.0001). The whitening toothpastes showed differences in their physical-chemical properties. All toothpastes promoted changes to the enamel surface, probably by the use of a bleaching agent.