title: Influence of surface roughness on the color of dental-resin composites.
abstract: This study deals with the influence of surface roughness on the color of resin composites. Ten resin composites (microfilled, hybrid, and microhybrid) were each polished with 500-grit, 1200-grit, 2000-grit, and 4000-grit SiC papers. The roughness parameter (R(a)) was measured using a Plμ confocal microscope, and field-emission scanning electron microscope (Fe-SEM) images were used to investigate filler morphology. Color was measured using a spectroradiometer and a D65 standard illuminant (geometry diffuse/0° specular component excluded (SCE) mode). Surface roughness decreased with grit number and was not influenced by filler size or size distribution. A significant influence of R(a) on lightness (L*) was found. Lightness increased with decreases in roughness, except for specimens that underwent polishing procedure 4 (PP4; 500-grit, 1200-grit, 2000-grit, and 4000-grit SiC papers consecutively). Generally, it was found that surface roughness influenced the color of resin composites. The composites that underwent PP1 (500-grit SiC paper) exhibited significant differences in chroma (C*), hue (h°), and lightness (L*) compared to composites that underwent PP3 (500-grit, 1200-grit, and 2000-grit SiC papers consecutively) and PP4. Color difference (∆E*) between the polishing procedures was within acceptability thresholds in dentistry.
authors: Department of Optics, Faculty of Science, University of Granada, Campus Fuentenueva s/n 18071, Granada, Spain.
authors: Razvan
authors: R
authors: Ghinea
authors: Laura
authors: L
authors: Ugarte-Alvan
authors: Ana
authors: A
authors: Yebra
authors: Oscar E
authors: OE
authors: Pecho
authors: Rade D
authors: RD
authors: Paravina
authors: Maria del Mar
authors: Mdel M
authors: Perez
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes