title: Effects of three bonding systems on the torsional resistance of titanium-reinforced composite cores supported by two post designs.
abstract: BACKGROUND
  There are no studies that have investigated the effects of bonding agents on the resistance to torque of a composite core supported by a prefabricated post.
  
  
  OBJECTIVE
  This study investigated the ability of bonding agents to resist rational forces applied to titanium-reinforced composite cores supported by 2 post designs.
  
  
  METHODS
  Two post designs (AccessPost and ParaPost dowels) with titanium-reinforced core material and 4 bonding conditions (AllBond-2, ScotchBond Multi-Purpose, Tenure A&B, and without a bonding agent) were studied. A total of 80 specimens in 8 experimental groups were prepared and subjected to clockwise torsional forces until failure.
  
  
  RESULTS
  Torsional values ranged from 53.31 in. x oz (ParaPost/ScotchBond Multi-Purpose) to 72.31 in. x oz (AccessPost/ScotchBond Multi-Purpose). Two-way of analysis of variance failed to demonstrate a significant difference among posts or type of bonding system.
  
  
  CONCLUSIONS
  The use of a multistep bonding agent had no significant effect on the torsional resistance of a core supported by a passive endodontic post.
authors.affiliation: Essential Dental Laboratories, South Hackensack, NJ, USA.
authors.forename: B I
authors.initials: BI
authors.lastname: Cohen
authors.forename: M K
authors.initials: MK
authors.lastname: Pagnillo
authors.forename: I
authors.initials: I
authors.lastname: Newman
authors.forename: B L
authors.initials: BL
authors.lastname: Musikant
authors.forename: A S
authors.initials: AS
authors.lastname: Deutsch
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D017267:Dental Prosthesis Design; D017220:Dentin-Bonding Agents / Q000737:chemistry; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry; D012399:Rotation; D013193:Stainless Steel / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D019415:Torque; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D013193:Stainless Steel; C074811:Tenure adhesive; C100742:All-Bond 2; D015036:Zinc Phosphate Cement; D014025:Titanium