Abstract
It has been suggested that the epoxy paint used to coat metal substrates in industrial electrostatic painting applications could also be used to mask metal clasps in removable dental prostheses (RDP). The purpose of this study was to evaluate both the influence of thermal cycling and the in vitro roughness of a surface after application of epoxy paint, as well as to assess the micromorphology of a cobalt-chromium (CoCr) based metal structure. Sixty test specimens were fabricated from a CoCr alloy. The specimens were separated into three groups (n = 20) according to surface treatment: Group 1 (Pol) - polished with abrasive stone and rubbers; Group 2 (Pol+Epo) - polished and coated with epoxy paint; Group 3 (Epo) - air-abraded with aluminum oxide particles and coated with epoxy paint. The surface roughness was evaluated before and after 1000 thermal cycles (5°C and 50°C). The surface micromorphology was verified by scanning electron microscopy (SEM). The two-way repeated measures ANOVA showed significant differences among surface treatments (p < 0.0001), but no difference was found before and after thermal cycling (p = 0.6638). The CoCr-based metal alloy surfaces treated with epoxy paint (Groups 2 and 3) were rougher than the surfaces that were only polished (Group 1). Thermal cycling did not influence surface roughness, or lead to chipping or detachment of the epoxy paint.
Highlights
Despite the advanced techniques available to restore edentulous areas with dental implants, there are still some patients who are not good candidates for implant therapy
This study suggests that it could be used in removable dental prostheses (RDP) to mask metal clasps, because it bonds to metal surfaces by means of an electrochemical process, and has good flexural ability.[13]
The factors under study were surface treatment on three levels (a - polished cobalt-chromium alloy; b - polished cobalt-chromium alloy coated with epoxy paint; c - cobalt-chromium alloy air-abraded with aluminum oxide particles and coated with epoxy paint) and time on two levels (a - before thermal cycling; b - after thermal cycling)
Summary
Despite the advanced techniques available to restore edentulous areas with dental implants, there are still some patients who are not good candidates for implant therapy. Nylon was introduced for use in bar-connections, dental seats, abutments and clasps.[4] Acetate resin was introduced,[5,6] in addition to overdentures instead of using clasps on anterior teeth, but the disadvantage of overdentures is their high cost. All these alternatives may fail early on, before metal clasps do, due to chipping and fracture caused by flexibility differences and the elasticity modulus, lower retentive forces and the thermal expansion coefficient between the material and the RDP metal used.[2,7,8,9,10,11,12]
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