title: Effect of dentin pretreatment with potassium oxalate: A 6-year follow-up.
abstract: Oxalate-based products are effective against dentine sensitivity and have been studied as an option to improve long-term adhesive bonding strength. Our aim was to evaluate the effect of potassium oxalate on the microtensile bond strength (µTBS) of the dentin/resin interface after 24 h, 1, and 6 years. Dentin on the occlusal surface of 16 human premolars was exposed and etched with 35% phosphoric acid. The teeth were divided into four groups. Two groups received 3% monohydrated potassium oxalate and the following adhesive systems and composites: Adper Scotchbond Multipurpose + FiltekZ350 (3M/ESPE) and Prime & Bond NT + Esthet-X (Dentsply). Two control groups did not receive potassium oxalate. Teeth were cut into sticks and kept in distilled water at 37°C for 24 h, 1, and 6 years. The sticks underwent µTBS testing after storage. ANOVA, Tukey's post hoc test, and paired t test were used to compare storage times (α = 0.05). The fracture mode of the specimens was classified under a stereomicroscope (40×). Morphology of the hybrid layer and the fracture pattern were observed with scanning electronic microscopy (SEM). Mean µTBS was high at 24 h and decreased after 1 and 6 years. After 6 years, the mean µTBS values were similar with no statistically significant difference between the groups (p = .121). SEM images showed proper dentin hybridization. Dentin pretreatment with potassium oxalate did not affect hybrid layer formation, but bond strength decreased over time after 24 h. Therefore, the clinical use of potassium oxalate to increase dentin bond durability is not indicated.
authors.affiliation: Laboratory of Characterization and Analysis of Biomaterials, Faculty of Dentistry, Federal University of Alagoas, Campus A. C. Simões, University City, Tabuleiro dos Martins, Maceió, Alagoas 57072-970, Brazil.
authors.forename: Isabel Cristina
authors.identifier: http://orcid.org/0000-0003-0908-7424
authors.initials: IC
authors.lastname: Celerino de Moraes Porto
authors.affiliation: Laboratory of Characterization and Analysis of Biomaterials, Faculty of Dentistry, Federal University of Alagoas, Campus A. C. Simões, University City, Tabuleiro dos Martins, Maceió, Alagoas 57072-970, Brazil.
authors.forename: Joatan Lucas
authors.initials: JL
authors.lastname: de Sousa Gomes Costa
authors.affiliation: Laboratory of Characterization and Analysis of Biomaterials, Faculty of Dentistry, Federal University of Alagoas, Campus A. C. Simões, University City, Tabuleiro dos Martins, Maceió, Alagoas 57072-970, Brazil.
authors.forename: Marcio Rafael
authors.initials: MR
authors.lastname: Nascimento da Silva Lopes
authors.affiliation: Department of Chemistry, Federal Institute of Alagoas, Rua Mizael Domingues, 75 Campus Maceió, Maceió, Alagoas, Brazil.
authors.forename: Johnnatan
authors.initials: J
authors.lastname: Duarte de Freitas
authors.affiliation: Faculty of Dentistry, University of Pernambuco, Av. General Newton Cavalcanti, 1650, Tabatinga, Recife, Camaragibe, Pernambuco 54753-020, Brazil.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Lins Macêdo de Oliveira
authors.affiliation: Faculty of Dentistry, University of Pernambuco, Av. General Newton Cavalcanti, 1650, Tabatinga, Recife, Camaragibe, Pernambuco 54753-020, Brazil.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Queiroz de Melo Monteiro
authors.affiliation: Faculty of Dentistry, University of Pernambuco, Av. General Newton Cavalcanti, 1650, Tabatinga, Recife, Camaragibe, Pernambuco 54753-020, Brazil.
authors.forename: Marcos Antônio
authors.initials: MA
authors.lastname: Japiassú Resende Montes
mesh_terms: D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000494:pharmacology*; D005500:Follow-Up Studies; D006801:Humans; D019815:Oxalic Acid / Q000494:pharmacology*
chemical_list: D017220:Dentin-Bonding Agents; D019815:Oxalic Acid
keywords: dentin bonding agents; dentin hybridization; dentistry; operative; tensile strength