J Adv Prosthodont.  2009 Mar;1(1):41-46. 10.4047/jap.2009.1.1.41.

Effect of adhesive primers on bonding strength of heat cure denture base resin to cast titanium and cobalt-chromium alloy

• Kim SS
• Vang MS
• Yang HS
• Park SW
• Lim HP

• KMID: 2176342
• DOI: http://doi.org/10.4047/jap.2009.1.1.41

Abstract

STATEMENT OF PROBLEM: The poor chemical bonding of a denture base resin to cast titanium framework often introduces adhesive failure and increases microleakage. PURPOSE: 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. MATERIAL 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 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(R) (MDP monomer) showed higher bond strength than those primed with the MR bond(R) (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(R), which contains the phosphoric acid monomer, MDP, might be clinically more acceptable for bonding a heat cure resin to titanium than a MR bond(R), which contains the carboxylic acid monomer, MAC-10.

Keyword

Heat cure denture base resin; Adhesive primers

MeSH Terms

Adhesives
Alloys
Collodion
Denture Bases
Dentures
Hot Temperature
Metals
Phosphoric Acids
Titanium
Adhesives
Alloys
Collodion
Metals
Phosphoric Acids
Titanium

Figure

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  Fig. 1 Metal conditioner were applied.

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  Fig. 2 Fabricated specimen.

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  Fig. 3 Test configuration for debonding.

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  Fig. 4 Shear bonding strength of three metal to two primer or non-primed of controls.

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  Fig. 5 A: Adhesive failure at non-primed specimens. M: Mixed failure of adhesive and cohesive failures at Primed specimens. ×50: The fracture surface of the specimens were observed with and optical microscope.

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  Fig. 6 Chemical structure of MAC-10, MDP.

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