Time-related surface modification of denture base acrylic resin treated by atmospheric pressure cold plasma

Abstract

The changes of denture base acrylic resin surface properties under cold plasma and the relationships with time were investigated. Cold plasma treated the specimens for 30 s, 60 s, 90 s, and 120 s, respectively. Water contact angles were measured immediately after the treatment, 48 h, 15 days and 30 days later. Surface roughness was measured with 3-D laser scanning microscope. Candida albicans adherence was evaluated by CFU counting. Chemical composition was monitored by X-ray photoelectron spectroscopy analysis. Water contact angle reduced after treated for 30 s. No changes were observed with time prolonged, except the durability. There were no differences in roughness among all groups. However, treatment groups showed significantly lower C. albicans adherence. XPS demonstrated a decrease in C/O, and this reduction was affected by treatment time. Cold plasma was an effective means of increasing hydrophilicity of acrylic resin and reducing C. albicans adherence without affecting physical properties.

A Comparison of the Surface Properties of CAD/CAM and Conventional Polymethylmethacrylate (PMMA)

“…Specimen dimensions were verified using a digital caliper (Mitutoyo Corp.). Likewise, specimens were stored in distilled water for 48 hours to minimize residual monomers …”

Effects of plasma jet, dielectric barrier discharge, photodynamic therapy and sodium hypochlorite on infected curved root canals

“…Another aspect to enhance the effect of CAP I and II might have been an extended irradiation time, as it has been found that prolonged plasma treatment of 8–10 min destroys E. faecalis biofilms completely . Some investigations showed no significant changes with prolonged application times and the risk of tissue damage should be considered . Another issue discussed in wound healing to enhance the effects is a repeated and/or combined application of CAP .…”

Translational plasma stomatology: applications of cold atmospheric plasmas in dentistry and their extension

“…609.003.1) jet and the round metal electrodes volume DBD plasma (INP Greifswald, Germany) are effective in against a wide range of pathogens including Candida albicans [147, 148]. It was reported that the argon/oxygen single‐electrode plasma jet seemed to be a promising and convenient strategy for preventing the early adherence of C. albicans on the acrylic resins, which would be greatly benefit for the potential dental applications [149]. As drug therapy is usually limited to the time in which signs of infection are present, the tissue‐tolerable plasma jet is an effective treatment tool for the denture stomatitis patients.…”