title: Effect of root canal treatments on quartz fiber posts bonding to root dentin.
abstract: The aim of this study was to evaluate the effect of irrigants and endodontic sealers on fiber post push-out strength in both fatigue cycling and no-cycling conditions. Fifty single-rooted human teeth received five endodontic treatments. The posts were cemented using a flowable composite and a three-steps adhesive. Five specimens from each group were subjected to 2 x 10(6) cycles of 37.5 N. There were 200 sections obtained for the push-out test. Fatigue cycled groups treated with an eugenol-containing sealer showed the lowest push-out strength (p < 0.001). No significant differences were found among no-cycled groups (p = 0.665). The post-cement interface was found to be weaker than the cement-dentin one. However, fatigue cycles increased the occurrence of cement-dentin failures (p = 0.001). The eugenol-containing sealer reduced the bonding of fiber posts when mechanically cycled, thus the use of a resin-based sealer is advisable.
authors.affiliation: Department of Dental Sciences, Alma Mater Studiorum, University of Bologna, Italy. PB.dos@med.unibo.it
authors.forename: Paolo
authors.initials: P
authors.lastname: Baldissara
authors.forename: Francesca
authors.initials: F
authors.lastname: Zicari
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Valandro
authors.forename: Roberto
authors.initials: R
authors.lastname: Scotti
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D019232:Dental Restoration Failure; D003804:Dentin / Q000648:ultrastructure*; D004492:Edetic Acid / Q000737:chemistry; D004853:Epoxy Resins / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry; D012388:Root Canal Irrigants / Q000737:chemistry; D012390:Root Canal Therapy / Q000379:methods*; D012973:Sodium Hypochlorite / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
chemical_list: D002614:Chelating Agents; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; C115110:Topseal; D015035:Zinc Oxide-Eugenol Cement; C111840:flowable hybrid composite; D011791:Quartz; D006171:Gutta-Percha; D004492:Edetic Acid; D012973:Sodium Hypochlorite