Optical Property Stability of Light-Cured versus Precured CAD-CAM Composites

Abstract

Objective. The aim of this study was to evaluate the optical property changes after staining of precured (PC) and light-cured (LC) composites. Materials and Methods. Specimens were prepared using different LC composites (GrandioSO—Voco, Filtek Z350-3M/ESPE, Opallis—FGM, and Kalore—GC) and four PC blocks (Grandio Blocs—Voco, Lava Ultimate—3M ESPE, Brava Block—FGM, and Cerasmart—GC) from the same manufacturers (n = 20). Baseline color, gloss, translucency, and fluorescence were evaluated. The staining protocol was performed for 15 days, and the final optical properties were reevaluated. Results. The changes in each property were calculated (ΔGloss, ΔTranslucency, ΔFluorescency, ΔE ∗ 00). Data were analyzed by ANOVA and Tukey’s test (α = 5%). Changes in all properties were observed after staining for all materials, with darkening and reduction of gloss, fluorescence, and translucency. Nonsignificant differences were observed between the light-cured and precured materials of the same manufacturer for ΔG and ΔT, but significant differences existed for ΔF and ΔE ∗ 00. For ΔF, the only significant differences were observed between Brava Block and Opallis (smaller). For ΔE ∗ 00, only the light-cured composites GrandioSO and Z350 showed significantly less change than the corresponding blocks. Precured composites were affected the same way as light-cured ones by the staining in relation to the reduction of gloss and translucency. Conclusion. A higher reduction in fluorescence was observed for only one brand of block and was similar for the others. The two brands of light-cured materials showed less staining, while for the others, the staining was similar. The effects of staining vary according to the composite formulation.

Comparative Evaluation of the Microleakage of Glass Ionomers as Restorative Materials: A Systematic Review of In Vitro Studies

“…The results showed that they have a negative effect on the marginal sealing in both conventional and RMGIC materials. However, in vitro tests performed with composite materials have demonstrated that other variables can have a significant influence on long-term durability, such as depth of cure [70], curing type [71], and interface contamination [72]. Therefore, future studies on the influence of these factors on GICs are needed to expand our knowledge of these materials.…”

Effect of coffee staining and simulated oral hygiene methods on the color and translucency of a nanoceramic resin

“…Staining of NCRs after immersion in coffee is also frequently found in the literature, with excellent, 27 acceptable, 27,29 moderately unacceptable, 9,11,20,22,24,25,29 clearly unacceptable, 25 and extremely unacceptable values. 28,32 The considerable variation in the results is probably related to the protocols and immersion times.…”

“…1,5,6 Studies have evaluated the color stability of NCRs after immersion in staining solutions such as coffee, 4,7-27 tea, 10,15,16,18,24,28,29 red wine, 6,10,11,15,17,18,20,28,30,31 cola, 7,8,[15][16][17]23,24,29 curry solution, 6,30 cress solution, 6,30 carrot juice, 13 ginger, 6,24 energy drink, 22,29 and staining broth recommended by ADA. 32 Coffee is one of the most used drinks for simulating staining in in vitro studies, 4, due to its high consumption worldwide. 25 ΔE ab and ΔE 00 color differences higher than 10.5 and 6.5, respectively, corresponding to a highly unacceptable mismatch (ΔE ab > 8.1 and ΔE 00 > 5.4), 33 were found upon staining of the NCRs in coffee.…”

Influence of surface roughness of universal shade resin composites on color adjustment potential

“…Incident light is reflected by the filler, resin matrix, pigments, and background color, then recognized as a certain color inside the composite. The most common cause of shade-matching failure between resin composites and teeth is lightness control errors because the human eye is more sensitive to light and dark than to color discrimination 24) . Luminance is inversely proportional to surface roughness in the case of resin composites that exhibit good polishability, low surface roughness, and good gloss, which may be the reason for the present experimental results.…”