Effect of Finishing Procedures on the Surface Roughness of Resin-modified Glass-Ionomer Materials
Garshasb, M.; Santos, G.C.; Rizkalla, A.S.; Bohay, R.; Santos, M.J.
Compendium of Continuing Education in Dentistry 38(7): E1-E4
2017
ISSN/ISBN: 2158-1797 PMID: 28727468 Document Number: 694583
This study examined the influence of finishing procedures on the surface roughness of different formulations of resin-modified glass ionomers (RMGIs) available in capsules compared with standard resin composites (RCs). Disc samples of three RMGIs and two RCs were fabricated using a metal mold (5 mm x 1.5 mm). Samples were randomly divided into seven groups (N = 10) and subjected to finishing and polishing procedures using a combination of carbide or diamond burs, followed by either rubber points or aluminum-oxide discs. Three different regions of each sample were analyzed using a contact profilometer to determine the average roughness (Ra). The main surface roughness was calculated using a two-way analysis of variance (ANOVA) and the Bonferroni correction for multiple comparisons. A dual-stage combination of a fine carbide bur followed by the use of the finest two grits of aluminum-oxide discs was found to produce the smoothest finished and polished surface. the smoothest surfaces were found to be on the two RCs and one of the RMGIs.