Abstract
PurposeThe debonding load of heat-activated polymethylmethacrylate (PMMA) denture base resin material to a nickel-chromium-beryllium (Ni-Cr-Be) alloy conditioned by three different surface treatments and utilizing two different commercial bonding systems was investigated.Materials and MethodsDenture resin (Lucitone-199) was bonded to Ni-Cr-Be alloy specimens treated with Metal Primer II, the Rocatec system with opaquer and the Rocatec system without opaquer. Denture base resin specimens bonded to non-treated sandblasted Ni-Cr-Be alloy were used as controls. Twenty samples for each treatment condition (80 specimens) were tested. The 80 specimens were divided into two categories, thermocycled and non-thermocycled, containing four groups of ten specimens each. The non-thermocycled specimens were tested after 48 hours’ storage in room temperature water. The thermocycled specimens were tested after 2,000 cycles in 4°C and 55°C water baths. The debonding load was calculated in Newtons (N), and collected data were subjected by non parametric test Kruskal-Wallis One Way Analysis of Variance on Ranks and Dunn’s post hoc test at the α = 0.05.ResultsThe Metal Primer II and Rocatec system without opaquer groups produced significantly higher bond strengths (119.9 and 67.6 N), respectively, than did the sandblasted and Rocatec system with opaquer groups, where the bond strengths were 2.6 N and 0 N, respectively. The Metal Primer II was significantly different from all other groups (P<0.05). The bond strengths of all groups were significantly decreased (P<0.05) after thermocycling. ConclusionsAlthough thermocycling had a detrimental effect on the debonding load of all surface treatments tested, the Metal Primer II system provided higher values among all bonding systems tested, before and after thermocycling.
Highlights
Strong adhesion between the denture base material and the metal framework of a removable dental prosthesis (RDP) is an important consideration during fabrication, The absence of chemical bonding can introduce microgaps that may lead to the deterioration and discoloration of an RPD [1].Metals used in the fabrication of a framework require sufficient strength to resist biting forces and corrosion and must be biocompatible with oral tissue
Bond strength of PMMA bonded to Ni-Cr-Be dental alloy
The debonding load was significantly decreased for all groups after thermocycling, with the SA group showing the highest relative reduction 100% followed by the RS (62%) and SAMP(23%) groups
Summary
Strong adhesion between the denture base material and the metal framework of a removable dental prosthesis (RDP) is an important consideration during fabrication, The absence of chemical bonding can introduce microgaps that may lead to the deterioration and discoloration of an RPD [1].Metals used in the fabrication of a framework require sufficient strength to resist biting forces and corrosion and must be biocompatible with oral tissue. The most widely used base alloys used in the fabrication of removable dental prostheses, are cobalt-chromium (Co-Cr) and nickel-chromium (Ni-Cr) based. Nickel-chromium-beryllium (Ni-Cr-Be) alloys are softer and have lower solidus at the expense of corrosion resistance [2]. Air abrasion has been shown to increase the bond strength between different types of metallic substrates and acrylic resin denture base materials. These effects have been reported for Ni-Cr-Be alloys [3, 4], Co-Cr alloys [5], silver-palladium-copper-gold (Ag-Pd-Cu-Au) alloys [6] and titanium-aluminum-niobium (Ti-6A1-7Nb) alloys [5, 6]
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