|Support type:||Scholarships in Brazil - Scientific Initiation|
|Effective date (Start):||May 01, 2011|
|Effective date (End):||April 30, 2012|
|Field of knowledge:||Health Sciences - Dentistry - Dental Clinics|
|Principal researcher:||Carlos Rocha Gomes Torres|
|Grantee:||Cristiane dos Santos Souza|
|Home Institution:||Faculdade de Odontologia (FOSJC). Universidade Estadual Paulista (UNESP). Campus de São José dos Campos. São José dos Campos , SP, Brazil|
This study will evaluate the effect of physical and chemical activation on the speed of penetration of hydrogen peroxide bleaching agents present in different concentrations through the enamel and dentin. One hundred and twenty bovine incisors will be used, which will be obtained enamel/dentin discs of the buccal surface, with 6 mm in diameter. The samples will be divided into six groups: G1 - Hydrogen Peroxide Gel 20%, G2 - Hydrogen Peroxide Gel 20% with light activation, G3 - Hydrogen Peroxide Gel 20% with Manganese Gluconate; G4 - Hydrogen Peroxide Gel 35%; G5 - Hydrogen Peroxide Gel 35% with the light activation and G6 - Hydrogen Peroxide Gel 35% with Manganese Gluconate. The specimens will be placed in a medium in which there will be a transparent substance showed hydrogen peroxide below and in contact with the specimen. After the procedures for applying the gel for each group, one video camera will be positioned and operated to monitor the time of penetration of peroxide in each specimen. The recording will end after changing the color of the fluid revealed in all specimens and times will be noted for comparison.