Premium
Celluloid strip‐finished versus polished composite surface: difference in surface discoloration in microhybrid composites
Author(s) -
Park S.H.,
Noh B.D.,
Ahn H.J.,
Kim H.K.
Publication year - 2004
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.0305-182x.2003.01206.x
Subject(s) - composite number , composite material , materials science , distilled water , nitrogen gas , resin composite , significant difference , color difference , nitrogen , mathematics , chemistry , enhanced data rates for gsm evolution , telecommunications , statistics , organic chemistry , chromatography , computer science
summary The aim of this study was to compare the surface discoloration of polished and celluloid strip‐finished composite surfaces in microhybrid type composites and to determine whether or not the discoloration of a celluloid strip‐finished composite surface is reduced if oxygen inhibition on the surface can be prevented. The composite surfaces were celluloid‐strip finished (group 1), polished (group 2), or celluloid‐strip finished under nitrogen gas purging (group 3). Z100, Spectrum, and Aelitefil were used as the test materials. After each surface treatment, the samples were stored in 37 °C distilled water for 24 h and placed in a disclosing solution (0·2% Erythrosin, pH 7·0) for 7 days in the dark. A computer controlled spectrophotometer was used to determine the CIELAB co‐ordinates ( L *, a *, b *). For each composite, the degree of discoloration among the groups was compared with a one‐way anova test. A Dunnett's t ‐test was then performed to compare the colour change in group 1 with that of group 2 or group 3. In all materials, there were no statistical differences in the surface discoloration between group 1 and group 2. In the Aelitefil and Spectrum test materials, the samples in group 3 showed a lower level of discoloration than the those in group 1. In Z100, there was no statistical difference. In microhybrid composites, there was no difference in surface discoloration between celluloid strip‐finished and the polished surface. Nitrogen gas purging during the polymerization process on the celluloid strip‐finished composite surface might be useful for reducing the discoloration celluloid strip‐finished surface in microhybrid composites.