title: Glass Fiber Post/Composite Core Systems Bonded to Human Dentin: Analysis of Tensile Load vs Calculated Tensile Strength of Various Systems Using Pull-out Tests.
abstract: OBJECTIVE
  Pull-out testing was used to determine the tensile load (TL) and tensile strength (TS) of five different fiber post systems bonded to human intracanal dentin.
  
  
  METHODS
  120 caries-free premolars, canines, and maxillary central incisors were divided into 5 different groups for 5 fiber post systems (n = 24): 1. RelyX Fiber Post 3D (RX3D); 2. RelyX Fiber Post (RX); 3. Luxa- Post (LP); 4. FibreKleer 4X Tapered Post (FK); 5. ParaPost Taper Lux (PP). The teeth were prepared and posts inserted. Core buildups were performed with the corresponding product's resin composite. All specimens were stored in water for 24 h at 37°C. TL and TS were tested on half of the specimens (n = 12/group). The remaining samples were thermocycled (10,000 x 5°C/55°C) before testing. TL was directly measured and TS was calculated using the bonding surface. Failure modes were identified using a stereomicroscope. Data were analyzed using twoway ANOVA with the post-hoc Scheffé test, as well as the chi-squared test (p < 0.05).
  
  
  RESULTS
  FK and LP resulted in the lowest mean TL but were not significantly different from those of RX and RX3D. The highest mean TL and TS were observed for PP. Nevertheless, PP fell within the same statistical subset as RX3D and RX. Thermocycling showed no impact on the results. RX3D predominantly showed debonding of the post plus core buildup from the tooth; all other systems mainly demonstrated detachment of the core from the posts.
  
  
  CONCLUSIONS
  PP, RX, and RX3D together with an adhesive core buildup yielded the highest bond strength to human dentin. Parameters TL and TS showed the same tendencies and statistical evidence.
authors.forename: Christine
authors.initials: C
authors.lastname: Keul
authors.forename: Patrick
authors.initials: P
authors.lastname: Köhler
authors.forename: Rüdiger
authors.initials: R
authors.lastname: Hampe
authors.forename: Malgorzata
authors.initials: M
authors.lastname: Roos
authors.forename: Bogna
authors.initials: B
authors.lastname: Stawarczyk
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D019231:Tooth Preparation, Prosthodontic / Q000379:methods; D014867:Water / Q000737:chemistry
chemical_list: C483702:Build-it composite resin; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; C474035:Filtek Supreme; C483522:LuxaCore; C488490:ParaPost Cement; C483701:Rely X Unicem; D019279:Resin Cements; C009753:fiberglass; D014867:Water; C041330:Scotchbond