title: The effect of eugenol-containing temporary cement on the bond strength of two resin composite core materials to dentin.
abstract: OBJECTIVE
  This study investigated the effect of eugenol-containing temporary cement on the bond strength of two resin composite core materials (FluoroCore and Ti-Core) to dentin.
  
  
  METHODS
  Dentin was exposed in three groups of extracted teeth (20 specimens each). In group one, dentin was covered with eugenol-containing temporary cement; the second group was covered with eugenol-free temporary cement; and the third group was left uncovered and served as a control group. All specimens were stored for 1 week at 37 degrees C and 100% humidity. The dentin surfaces were cleaned and treated using the GLUMA adhesive system, followed by placement of composite core build-ups. Debonding of the core material was accomplished using the Accuforce Elite test system.
  
  
  RESULTS
  There was a significant reduction in bond strength for the specimens covered with eugenol temporary cement (p < .0001), but no significant difference was found between the control group and the group treated with eugenol-free temporary cement. Bond strength of the Ti-Core material to dentin was significantly higher than that of FluoroCore (p < .0001).
  
  
  CONCLUSIONS
  Pretreatment of the dentin with eugenol-based temporary cement adversely affects the bond strength of resin composite core material to dentin.
authors.affiliation: Department of Restorative Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
authors.forename: K A
authors.initials: KA
authors.lastname: al-Wazzan
authors.forename: A A
authors.initials: AA
authors.lastname: al-Harbi
authors.forename: I A
authors.initials: IA
authors.lastname: Hammad
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000706:statistics & numerical data; D003804:Dentin / Q000187:drug effects*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005054:Eugenol / Q000737:chemistry*; D005460:Fluorides, Topical / Q000737:chemistry*; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D011176:Post and Core Technique; D011897:Random Allocation; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D005460:Fluorides, Topical; C074316:FluoroCore; C079578:Ti-Core composite resin; D005054:Eugenol