Oxygen inhibition of surface composites and its correlation with degree of conversion and color stability
Department of Operative Dentistry and Dental MaterialsBorges, Marcela Gonçalves; Department of Operative Dentistry and Dental MaterialsSilva, Gisele Rodrigues; Department of Operative Dentistry and Dental MaterialsNeves, Fernanda Teodoro; Department of Operative Dentistry and Dental MaterialsSoares, Carlos José; Faria-e-Silva, André Luís; Department of Operative Dentistry and Dental MaterialsCarvalho, Roberta Furtado; Department of Operative Dentistry and Dental MaterialsMenezes, Murilo Sousa.
Braz. dent. j
; 32(1): 91-97, Jan.-Feb. 2021. tab, graf
Artículo
en Inglés
| LILACS, BBO - odontología (Brasil) | ID: biblio-1180719
Abstract This study investigated the effects of oxygen inhibition and finishing/polishing procedures on the composite resin properties. One bulk-fill and two conventional composite resins (nanoparticle and microhybrid) were evaluated. Specimens were prepared using 4 surface treatments control, no treatment; Gly, oxygen inhibition with glycerin; FP, finishing and polishing; Gly + FP, glycerin followed by finishing and polishing. The degree of conversion (DC) was measured using Fourier Transformed Infrared Spectroscopy (FTIR) immediately and after 15 days (n=5). Color stability (ΔEab, and ΔE00) and opacity were evaluated using a spectrophotometer after 15 days of immersion in coffee, using the CIELAB system (n=5). Data were analyzed by two-way ANOVA and Tukey tests (α=0.05) and opacity by two-way repeated-measures ANOVA. Glycerin usage increased significantly the DC however had no influence on the ΔEab, ΔE00 and, opacity values. Finishing and polishing reduced ΔEab and ΔE00 values, regardless of composite resins. Microhybrid showed higher opacity, followed by the nanoparticle and bulk fill, regardless of surface treatment. Post-polymerization polishing procedures resulted in lower conversion than using an oxygen inhibitor agent (Gly condition), but similar staining caused by coffee.
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