title: Effect of adhesive primers on bonding strength of heat cure denture base resin to cast titanium and cobalt-chromium alloy.
abstract: BACKGROUND
  The poor chemical bonding of a denture base resin to cast titanium framework often introduces adhesive failure and increases microleakage.
  
  
  OBJECTIVE
  This study evaluated the shear bond strengths of a heat cure denture base resin to commercially pure titanium, Ti-6Al-4V alloy and a cobalt-chromium alloy using two adhesive primers.
  
  
  METHODS
  Disks of commercially pure titanium, Ti-6Al-4V alloy and a cobalt-chromium alloy were cast. Specimens without the primer were also prepared and used as the controls. The shear bond strengths were measured on a screw-driven universal testing machine.
  
  
  RESULTS
  The primers significantly (P < .05) improved the shear bond strengths of the heat cure resin to all metals. However, the specimens primed with the Alloy primer® (MDP monomer) showed higher bond strength than those primed with the MR bond® (MAC-10 monomer) on titanium. Only adhesive failure was observed at the metal-resin interface in the non-primed specimens, while the primed specimens showed mixed failure of adhesive and cohesive failure.
  
  
  CONCLUSIONS
  The use of appropriate adhesive metal primers makes it possible not only to eliminate the need for surface preparation of the metal framework before applying the heat cure resins, but also reduce the need for retentive devices on the metal substructure. In particular, the Alloy primer®, which contains the phosphoric acid monomer, MDP, might be clinically more acceptable for bonding a heat cure resin to titanium than a MR bond®, which contains the carboxylic acid monomer, MAC-10.
authors.affiliation: Graduate Student, Department of Prosthodontics, Graduate School, Chonnam National University, Gwang-Ju, Korea.
authors.forename: Su-Sung
authors.initials: SS
authors.lastname: Kim
authors.forename: Mong-Sook
authors.initials: MS
authors.lastname: Vang
authors.forename: Hong-So
authors.initials: HS
authors.lastname: Yang
authors.forename: Sang-Won
authors.initials: SW
authors.lastname: Park
authors.forename: Hyun-Pil
authors.initials: HP
authors.lastname: Lim