title: Influence of root dentin treatment on the push-out bond strength of fiber posts.
abstract: The aim of the present study was to assess whether different dentin conditioning protocols with different acids [phosphoric acid, ethylene diamine tetra acetic acid (EDTA), and polyacrylic acid (PAA)] influence the bond strength of fiber posts along the radicular depth when luted with self-adhesive resin cement. Twenty single-rooted teeth were randomly divided into four experimental groups (n = 5) according to dentin treatment: Group 1: no treatment; Group 2: etching with 35 % phosphoric acid for 10 s; Group 3: 17 % EDTA application for 60 s; and Group 4: conditioning with 25 % PAA for 30 s. RelyX Fiber Posts were luted with the self-adhesive resin cement RelyX Unicem 2 Automix (3M ESPE). Roots were transversally sectioned into nine 1-mm thick specimens, three corresponding to each root third and a push-out test was performed. Data were analyzed by two-way ANOVA and Tukey test (p < 0.05). Failure mode was determined and specimens with representative failures for each group were observed under scanning electron microscopy. According to the results, dentin treatment influenced the bond strength (p < 0.001), whereas the root third did not (p > 0.05). Fiber posts luted after treating dentin with phosphoric acid, and PAA exhibited the highest push-out bond strength values, while the lowest were obtained after EDTA application. Intermediate results were obtained when dentin was not conditioned. In conclusion, the bond strength of the self-adhesive resin cement RelyX Unicem 2 improves when root dentin is treated with 35 % phosphoric acid or 25 % PAA, before fiber posts luting irrespective of the root depth.
authors.affiliation: Department of Medicine-Surgery, Psychology, Preventive Medicine, Public Health-Medical Microbiology-Immunology, Stomatology and Nursing, Rey Juan Carlos University, Avda. Atenas s/n, Alcorcón, Madrid, 28922, Spain. eugeniabaena.baena30@gmail.com.
authors.forename: E
authors.initials: E
authors.lastname: Baena
authors.affiliation: Private Clinical Practice, Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Flores
authors.affiliation: Department of Medicine-Surgery, Psychology, Preventive Medicine, Public Health-Medical Microbiology-Immunology, Stomatology and Nursing, Rey Juan Carlos University, Avda. Atenas s/n, Alcorcón, Madrid, 28922, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Ceballos
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins; D003786:Dental Pulp Cavity / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D004492:Edetic Acid; D004853:Epoxy Resins; D005899:Glass Ionomer Cements; D066298:In Vitro Techniques; D008422:Materials Testing; D010756:Phosphoric Acids; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry*; D012387:Root Canal Filling Materials; D018915:Root Canal Preparation / Q000379:methods*
chemical_list: D000180:Acrylic Resins; D017220:Dentin-Bonding Agents; D004853:Epoxy Resins; D005899:Glass Ionomer Cements; D010756:Phosphoric Acids; C483701:Rely X Unicem; D019279:Resin Cements; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; C067790:Vitrabond; C006903:carbopol 940; D004492:Edetic Acid; C030242:phosphoric acid
keywords: Dentin treatment; Fiber post; Push-out; Self-adhesive resin cement; Smear layer