Effect of cold light bleaching on the surface micro-hardness and surface roughness of resin composites
WU Mei-sheng
CAI Yi-da
WEI Hua
ZHAO Shou-liang
Abstract：AIM:To evaluate the effects of cold light bleaching on the surface micro-hardness and rough-ness of resin composites.METHODS:Disc-shaped specimens from resin composites,Gradia Direct,Z350XT, Premisa and Précis,were fabricated in a cylindrical rubber mold (10 mm of diameter ×2 mm of depth).20 specimens were randomly divided into 2 groups (n=10).Specimes in treatment group were bleached by cold light and those in other group were placed in distilled water and received no treatment.After the bleaching procedure,the specimens were subjected to the Vickers hardness measurements.3 specimens in each group were observed by an Atomic Force Micro-scope (AFM)before and after treatment.Data were analyzed by SPSS19.0.RESULTS:The surface micro-hardness of bleaching group was significantly lower than that of control group (P<0.05).The surface roughness of the compos-ites increased after bleaching (P<0.05 ).CONCLUSION:Cold light bleaching may decrease the micro-hardness and increase the surface roughness of resin composites.
Keywords：bleachingresinmicro-hardnesssurface roughness
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 645-648 )