title: Effects of dietary acids on surface microhardness of various tooth-colored restoratives.
abstract: The aim of this in vitro study was to investigate if surface microhardness of Fuji IX GP, Vitremer, Dyract AP, and Prodigy is influenced by conditioning in aqueous solutions of lactic, orthophosphoric, citric, and acetic acids against bidistilled water (which was used as control). The pH values of acids used in this study were representative of dietary acids. All specimens were stored in bidistilled water for one week and then conditioned in the respective test solutions for another week. Citric (p<0.05) and acetic acids reduced, while lactic and orthophosphoric acids (p<0.05) increased the microhardness of both Fuji IX GP and Vitremer. On the other hand, microhardness of both Dyract AP and Prodigy was significantly reduced by all acidic media (p<0.05). The observed differences in the surface microhardness of various tooth-colored restorative materials conditioned in several media varied not only with the pH but also the nature of the acidic solution, and with the composition of the evaluated material.
authors.affiliation: Department of Operative Dentistry, Faculty of Dentistry, Istanbul University, Istanbul, Turkey. yavuzgom@yahoo.com
authors.forename: Yavuz
authors.initials: Y
authors.lastname: Gömeç
authors.forename: Can
authors.initials: C
authors.lastname: Dorter
authors.forename: Handan
authors.initials: H
authors.lastname: Ersev
authors.forename: Begüm
authors.initials: B
authors.lastname: Guray Efes
authors.forename: Esra
authors.initials: E
authors.lastname: Yildiz
mesh_terms: D019342:Acetic Acid; D000143:Acids; D000704:Analysis of Variance; D019343:Citric Acid; D020770:Compomers; D003188:Composite Resins; D003764:Dental Materials; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D004032:Diet; D005899:Glass Ionomer Cements; D006244:Hardness; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid; D008422:Materials Testing; D010756:Phosphoric Acids; D018709:Statistics, Nonparametric; D013499:Surface Properties
chemical_list: D000143:Acids; D020770:Compomers; D003188:Composite Resins; D003764:Dental Materials; C088486:Dyract; C439808:Fuji IX GP Fast; D005899:Glass Ionomer Cements; D010756:Phosphoric Acids; C099128:Prodigy; C084550:Vitremer; D019343:Citric Acid; D019344:Lactic Acid; C030242:phosphoric acid; D019342:Acetic Acid