Evaluation of shear bond strength of repair acrylic resin to Co-Cr alloy

Abstract

PURPOSEThe purpose of this study was to investigate the impact of different surface treatment methods and thermal ageing on the bond strength of autopolymerizing acrylic resin to Co-Cr.MATERIALS AND METHODSCo-Cr alloy specimens were divided into five groups according to the surface conditioning methods. C: No treatment; SP: flamed with the Silano-Pen device; K: airborne particle abrasion with Al2O3; Co: airborne particle abrasion with silica-coated Al2O3; KSP: flamed with the Silano-Pen device after the group K experimental protocol. Then, autopolymerized acrylic resin was applied to the treated specimen surfaces. All the groups were divided into two subgroups with the thermal cycle and water storage to determine the durability of the bond. The bond strength test was applied in an universal test machine and treated Co-Cr alloys were analyzed by scanning electron microscope (SEM). Two-way analysis of variance (ANOVA) was used to determine the significant differences among surface treatments and thermocycling. Their interactons were followed by a multiple comparison' test performed uing a post hoc Tukey HSD test (α=.05).RESULTSSurface treatments significantly increased repair strengths of repair resin to Co-Cr alloy. The repair strengths of Group K, and Co significantly decreased after 6,000 cycles (P<.001).CONCLUSIONThermocycling lead to a significant decrease in shear bond strength for air abrasion with silica-coated aluminum oxide particles. On the contrary, flaming with Silano-Pen did not cause a significant reduction in adhesion after thermocycling.

Effect of Diazonium Salt and Aluminum Oxide on Microleakage of PMMA at Co/Cr and Titanium Alloys Interface

“…Co/Cr alloy (Adentatec, Germany) casted by using centrifugal casting technique, following the manufacturer's instructions, titanium alloy (Baoji Jinsheng, China) casted by using vacuum-pressure machine, following the manufacturer's instructions. All the surfaces of specimens ground finished using silicon carbide paper (number p60) (Trojan, China) in the grinding machine (160E, Mapao, China) under running water on 300 rpm for 10 seconds to provide uniform and flat surface (10,11) then cleaned ultrasonically for 3 minutes with deionized water and dried with air (12).…”

“…After obtaining 30 rectangular shape specimens for each Co/Cr alloy and titanium alloy, a layer of modeling wax (Shanghai, China) adapted all around the Co/Cr alloy and titanium alloy specimens except one end for dye penetration assessment (13). Both specimens Co/Cr alloy and titanium alloy flasked in standard technique for acrylic dentures with dental stone (Easy Dental, Bulgaria) (14,15), then specimens dewaxed and cleaned using boiled water (12) . Before packing, the specimens of each Co/Cr and titanium divided into 3 groups according to the surface treatment that they received (n=10 for each group).…”

“…Then the specimens cleaned with ultrasonic cleaner by distilled water for 20 minutes in order to remove any stain on the surface. The specimens allowed to bench dry for 24 hours to ensure that the fluorescein dye penetration ended (12) . The depth of dye penetration between the heat curing acrylic resin and Co/Cr or titanium denture base materials was assessed under ultraviolet light (Escolite, China) with wavelength 395 nm and digital microscope (Dino-Lite, Taiwan) with a magnification of 8x as shown in figure (1) (7) .…”

Effect of Surface Textures and Fabrication Methods on Shear Bond Strength Between Titanium Framework and Auto-Polymerizing Acrylic Repair Resin

“…One shortcoming of RPDs is the susceptibility of the overlaying acrylic resin to fracture at the metal-resin interface when dropped or overloaded beyond its fracture strength [2,8,9]. Repair of the fractured acrylic provides a feasible and economic solution over the construction of a new replacement RPD [8,9].…”

“…One shortcoming of RPDs is the susceptibility of the overlaying acrylic resin to fracture at the metal-resin interface when dropped or overloaded beyond its fracture strength [2,8,9]. Repair of the fractured acrylic provides a feasible and economic solution over the construction of a new replacement RPD [8,9]. Denture repair involves different materials and techniques such as visible light-polymerized, microwavepolymerized, auto-polymerized (self-cure), and heat-polymerized acrylic resins [8].…”