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KMID : 1023820090010010041
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The Journal of Advanced Prosthodontics
2009 Volume.1 No. 1 p.41 ~ p.46
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Effect of adhesive primers on bonding strength of heat cure denture base resin to cast titanium and cobalt-chromium alloy
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Kim Su-Sung
Vang Mong-Sook
Yang Hong-So
Park Sang-Won
Lim Hyun-Pil
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Abstract
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Statement Of Problem: The poor chemical bonding of a denture base resin to cast titanium framework often introduces adhesive fail-ure and increases microleakage.
Purpose: This study evaluated the shear bond strengths of a heat cure denture base resin to commer-
cially pure titanium, Ti-6Al-4V alloy and a cobalt-chromium alloy using two adhesive primers.
Materials and 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 con-trols. 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 onomer) 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 tita-nium than a MR bond®, which contains the carboxylic acid monomer, MAC-10.
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KEYWORD
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Heat cure denture base resin, Adhesive primers
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