Influence of differents kinds and concentrations of chemical activators and light activation on bleaching efficiency

• Grant number: 10/50912-8
• Support Opportunities: Regular Research Grants
• Start date: September 01, 2010
• End date: August 31, 2012
• Field of knowledge: Health Sciences - Dentistry - Dental Clinics
• Principal Investigator: Carlos Rocha Gomes Torres
• Grantee: Carlos Rocha Gomes Torres
• Host Institution: Faculdade de Odontologia (FOSJC). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil

Abstract

The aim of this study will be to evaluate the efficiency of different kinds and concentrations of chemical activators to increase the effectiveness of 35% hydrogen peroxide bleaching gel with. It will be used 270 bovine incisors, from which will be obtained 540 enamel-dentin discs, with 3mm in diameter, using trephine mill. The initial color reading of the specimens will be performed with the CM2600d spectrophotometer (Konica Minolta). It will be used for all groups a 35% hydrogen peroxide gel prepared in our laboratories. For the evaluations of the chemical activators, the specimens were divided according to the kind and concentration of activator added: MG - Manganese Gluconate (0,01%, 0,02% e 0,03%), MC - Manganese Chloride (0,01%, 0,02% e 0,03%), FG - Ferrous Gluconate (0,01%, 0,02% e 0,03%), FC - Ferric Chloride (0,01%, 0,02% e 0,03%) and FS - Ferrous Sulphate (0,001%, 0,002% e 0,003%). The group LA will receive physical activation using blue light from the device Bright Max II (MM Optics). It will be prepared two control groups. The positive control (PC) will receive the bleaching gel without any chemical activator while in the negative control group (NC) the specimens will be only immersed in artificial saliva. Over the enamel surface will be performed 3 applications of the bleaching gels for 10 min each, that will be repeated after 7 days, in a total of 2 sessions of 30 minutes. The color assessments will be performed 24 hours after the first session and 24 hours after the second. The specimens will be stored in artificial saliva and assessed again after 6 month and one year. The data will be analyzed by parametric analysis of variance (ANOVA) for repeated measures and Tukey's test. (AU)