title: Effect of curing modes of dual-curing luting systems and root regions on retention of translucent fiber posts in root canals.
abstract: OBJECTIVE
  To evaluate the effect of different curing modes of dual-curing luting systems and root regions on the push-out strength of fiber posts to intraradicular dentin.
  
  
  METHODS
  Forty-two extracted premolars with a single root canal were sectioned at the cementoenamel junction and the roots were endodontically treated. The roots were divided into two groups according to two dual-curing luting systems: (1) XP BOND-Dual Cure/Calibra resin cement; (2) XP BOND-Dual Cure/FluoroCore 2. For each luting system, three different curing modes were applied to the dentin adhesive and resin cement: "Self-cure and Self-cure (SC&SC)", "Self-cure and Dual-cure (SC&DC)", and "Dual-cure and Dual-cure (DC&DC)". Translucent Easy fiber posts (Dentsply Maillefer) were luted in the roots. A thin-slice push-out test was performed, and the data of push-out strength were analyzed using three-way ANOVA with luting system, curing mode, and root region (apical, middle and coronal) as factors. Tukey's test was used for post-hoc comparisons.
  
  
  RESULTS
  The push-out strength of XP BOND-Dual Cure/Calibra was significantly lower when Calibra resin cement was self-cured than when it was dual-cured (SC&SC: 6.04 +/- 2.65 MPa; SC&DC: 10.69 +/- 3.01 MPa; DC&DC: 10.72 +/- 3.63 MPa; p < 0.05). The curing modes did not affect the push-out strength of XP BOND-Dual Cure/FluoroCore 2 (SC&SC: 7.90 +/- 3.94 MPa; SC&DC: 8.32 +/- 2.73 MPa; DC&DC: 9.27 +/- 4.12 MPa; p > 0.05). The coronal push-out strength was significantly higher than the apical push-out strength (p < 0.05).
  
  
  CONCLUSIONS
  Retention of fiber posts in root canals was affected by the curing modes of dual-curing luting system and root regions.
authors.affiliation: Stomatological College, Fourth Military Medical University, Xi'an, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.forename: Elisa
authors.initials: E
authors.lastname: Magni
authors.forename: Ivana
authors.initials: I
authors.lastname: Radovic
authors.forename: Ying-Jie
authors.initials: YJ
authors.lastname: Wang
authors.forename: Ji-Hua
authors.initials: JH
authors.lastname: Chen
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005460:Fluorides, Topical / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry*; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D013499:Surface Properties; D019227:Tooth Apex / Q000648:ultrastructure; D019553:Tooth, Nonvital / Q000628:therapy
chemical_list: C433205:Calibra; D003188:Composite Resins; C095997:DCR cement; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D005460:Fluorides, Topical; C074316:FluoroCore; D019279:Resin Cements; C532387:XP-Bond