Effect of root canal treatments on quartz fiber posts bonding to root dentin.
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.
Baldissara
Paolo
P
Department of Dental Sciences, Alma Mater Studiorum, University of Bologna, Italy. PB.dos@med.unibo.it
Zicari
Francesca
F
Valandro
Luiz Felipe
LF
Scotti
Roberto
R
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
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