상온대기압 질소 및 공기 플라즈마가 의치상용 레진의표면 특성과 살균효과에 미치는 영향

Abstract

Objectives : The purpose of this study was to investigate the effect of non-thermal atmospheric pressure plasma jet(NTAPPJ) on surface properties and Streptococcus mutans disinfection of denture base resin.

Methods : Self-cured denture base resin (Jet denture repair resin, Lang dental Mfg, co., USA) was used to make specimen(12 mm × 2 mm). To observe surface change before and after plasma process, surface roughness and contact angle were measured. For sterilization experiments, the surfaces of specimens were treated with nitrogen and air NTAPPJ for 1 minute after S. mutans was inoculated on the material surfaces.

Results : Before plasma process, surface roughness of denture base resin was 0.21 §­± 0.02 §­. After air and nitrogen NTAPPJ process, surface roughness was 0.19 §­± 0.03 §­and 0.18 §­± 0.01 §­respectively. There was no significant difference(p>0.05). Contact angle of control group without plasma process was 83.81ß± 3.14ß, while after plasma treatment, contact angles of air NTAPPJ and nitrogen NTAPPJ groups were 63.29ß± 2.27ßand 46.68ß± 5.82ß respectively. The result showed a significant decrease in contact angle after plasma process(p<0.05). Compared to the control group 6020.33(CFU/mL) without plasma process, CFU decreased significantly after air NTAPPJ 90.75(CFU/mL) and nitrogen NTAPPJ 80.25(CFU/mL) treatment(p<0.05).

Conclusions : It was considered that NTAPPJ can be used for denture disinfection without changing surface properties of materials.