title: In vitro evaluation of the microhardness of bovine enamel exposed to acid solutions after bleaching.
abstract: Acid erosion is a superficial loss of enamel caused by chemical processes that do not involve bacteria. Intrinsic and extrinsic factors, such as the presence of acid substances in the oral cavity, may cause a pH reduction, thus potentially increasing acid erosion. The aim of this study was to evaluate the microhardness of bleached and unbleached bovine enamel after immersion in a soda beverage, artificial powder juice and hydrochloric acid. The results obtained for the variables of exposure time, acid solution and substrate condition (bleached or unbleached enamel) were statistically analyzed by the ANOVA and Tukey tests. It was concluded that a decrease in microhardness renders dental structures more susceptible to erosion and mineral loss, and that teeth left unbleached show higher values of microhardness compared to bleached teeth.
authors.affiliation: Department of Prosthodontics and Integrated Clinics, College of Dentistry, Ibirapuera University, São Paulo, Brazil.
authors.forename: Caio Gorgulho
authors.initials: CG
authors.lastname: Zanet
authors.forename: Marcelo
authors.initials: M
authors.lastname: Fava
authors.forename: Levy Anderson César
authors.initials: LA
authors.lastname: Alves
mesh_terms: D000143:Acids / Q000009:adverse effects*; D000818:Animals; D002253:Carbonated Beverages / Q000009:adverse effects; D002417:Cattle; D002951:Citrates / Q000009:adverse effects; D003743:Dental Enamel / Q000737:chemistry / Q000187:drug effects*; D005750:Gastric Juice / Q000737:chemistry; D006244:Hardness / Q000187:drug effects*; D006245:Hardness Tests / Q000379:methods; D006861:Hydrogen Peroxide / Q000009:adverse effects*; D011897:Random Allocation; D000077559:Sodium Citrate; D013499:Surface Properties; D013997:Time Factors; D014073:Tooth Bleaching / Q000009:adverse effects*; D014077:Tooth Erosion / Q000139:chemically induced
chemical_list: D000143:Acids; D002951:Citrates; D000077559:Sodium Citrate; D006861:Hydrogen Peroxide