Whitening efficacy of over-the-counter bleaching products associated to 10% carbamide peroxide gels

• Grant number: 15/22943-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: April 01, 2016
• End date: March 31, 2017
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Taciana Marco Ferraz Caneppele
• Grantee: Evaniele Santos Claudino
• Host Institution: Instituto de Ciência e Tecnologia (ICT). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil

Abstract

Objectives: The aim of this study is to assess the effectiveness of over the counter bleaching agents associated with 10% carbamide peroxide bleaching gels Materials and Methods: One hundred and twenty specimens of enamel and dentin of 3 mm diameter will be obtained from bovine incisors. The specimens will be embedded in acrylic resin, keeping only the enamel surface exposed. After, specimens will be stained for 14 days in broth staining, polished and initial color reading will be performed by a spectrophotometer CM-2600d (Konica Minolta, Osaka, Japan). 0 Half of the samples will be submitted to a home whitening with 10% carbamide peroxide (Whiteness Perfect, FGM), and the other half will not be subjected to bleaching, and are divided into eight groups (n = 15), according with the product associated with the home whitening. The four groups will submitted to the bleaching process are: PC-AG - water; PC-LI - whitening mouthwash (Listerine Whitening - Johnson & Johnson); . PC-EConv - conventional toothpaste (Colgate Triple Action, Colgate-Palmolive), PC-EClar - whitening toothpaste (Colgate Luminous White Advanced, Colgate-Palmolive), these same products are used in groups that do not receive the whitening: AG , LI, EConv and EClar. The specimens to be whitened will receive application of 10% carbamide peroxide for 8h. Then, they will be washed in deionized water, maintained 5 min in staining broth, 2 min in over-the-counter agents and then in artificial saliva to complete 24 hours of application of the bleaching agent. This process will be repeated 14 times and will begin the new 12-week cycle using only the over-the-counter agents (the specimens remain 5 min in staining broth, 2 min over-the-counter agents and then in artificial saliva to complete 24 hours ). The other half of the groups pass directly through the 12 week cycle. In the 4th, 8th and 12th week will be held new color readings. Data will be collected and subjected to statistical analysis.