Abstract:This study investigated differences in colour (ΔE00) and translucency parameter (ΔTP00) of nanofilled/microhybrid composites and a glass-ionomer cement following immersion in bioflavonoid (Citrox)- or chlorhexidine-based mouth rinses. Sixty disc-shaped specimens (N = 5/group) of Filtek Supreme (3M), Gradia Anterior (GC) and Fuji IX (GC) were exposed to Citrox/0.2%CHX (Perio+0.2, Curaprox), Citrox/0.09%CHX (Perio+0.09, Curaprox), 0.2%CHX (Savacol, Colgate-Palmolive) or distilled water by 2-min agitation daily f… Show more
“…They concluded that flowable composite had the lowest surface roughness, whereas the flowable compomer had the greatest. [ 36 ] The study has some drawbacks, including a small sample size and limited immersion techniques. In addition, larger-scale investigations will be done on this topic.…”
“…They concluded that flowable composite had the lowest surface roughness, whereas the flowable compomer had the greatest. [ 36 ] The study has some drawbacks, including a small sample size and limited immersion techniques. In addition, larger-scale investigations will be done on this topic.…”
“…L * = 25.87, a * = −1.12 and b * = 0.95 are the CIE values for the black setting, while L * = 69.79, a * = 0.03 and b * = 2.70 are the CIE values for the white setting. The following formula was used to calculate the TP 00 for each specimen 47 : Figure 4 The color measurement. ( A ) The photometer unit of the spectrophotometer device, ( B ) the middle of the facial surface of the specimen fixed on the outer surface of the holder (4-mm diameter), ( C ) the holder with the specimen positioned in its place inside the spectrophotometer, and ( D ) back and white plasticine covering the specimen during measurements.…”
Section: Methodsmentioning
confidence: 99%
“…L * = 25.87, a * = −1.12 and b * = 0.95 are the CIE values for the black setting, while L * = 69.79, a * = 0.03 and b * = 2.70 are the CIE values for the white setting. The following formula was used to calculate the TP 00 for each specimen 47 B − H ′ W represents the difference in hue under black and white settings. The rotation factor and the weighting function are given by R T and S. The parametric factors are indicated by K L , K C , and K H .…”
Section: Color and Translucency Measurement (After Cementation) A Ref...mentioning
To investigate the effect of resin cements on the color stability and translucency of ceramic laminate veneers used for diastema closure. Sixty resin abutments were prepared for ceramic laminate veneers and divided into six groups according to the ceramic type (lithium disilicate, zirconia-reinforced lithium silicate, and translucent zirconia) and the cement type (Variolink Esthetic LC and RelyX Veneer). Color coordinates and translucency were analyzed after cementation and after soaking in the coffee solution. Differences in color and translucency were estimated, and results were statistically assessed (α = 0.05). Ceramic materials showed a significant impact on color changes after soaking in coffee within Variolink Esthetic groups. Translucent zirconia showed the highest color change, followed by zirconia reinforced lithium silicate and lithium disilicate. Ceramic materials showed a significant impact among the RelyX Veneer groups. A significant interaction in color changes was found between ceramic types and cement types after cementation, and after soaking in coffee was found. All groups showed a clinically acceptable difference in translucency parameters after soaking in coffee. The resin cement affects the color and translucency of ceramic laminate veneers used for diastema closure, and ceramic laminate veneers bonded with Variolink Esthetic LC resin cement are more translucent, while ceramic laminate veneers bonded with RelyX Veneer resin are more resistant to coffee staining. The lithium disilicate laminate veneer is more resistant to coffee staining than zirconia reinforced lithium silicate and translucent zirconia laminate veneers used for diastema closure.
“…However, this composite is also relevant in terms of color stability due to its chromogenic potential, causing brown stains on the teeth, tongue and on silicate and resin composite restorations [ 9 ]. Several staining mechanisms have been described for chlorhexidine such as its degradation to release parachloraniline, non-enzymatic browning reactions, denaturation of proteins by chlorhexidine with formation of metal sulfide and precipitation of anionic dietary chromogens by cationic antiseptics [ 3 , 6 , 10 ].…”
Section: Introductionmentioning
confidence: 99%
“…CHX present in mouthwashes could affect the color stability of resin composite restorations [ 9 ], even more so if other factors contribute to pigment retention on the resin composite surface. Therefore, a coarse-to-fine-grained polishing system needs to be applied in order to test whether a considerable color variation in nanohybrid resin composites can be avoided [ 5 , 10 , 11 ].…”
The use of chlorhexidine-based mouthwashes on resin composites with rough surfaces can cause discoloration which compromises the esthetic of patients. The present study aimed to evaluate the in vitro color stability of Forma (Ultradent Products, Inc., South Jordan), Tetric N-Ceram (Ivoclar Vivadent, Schaan, Liechtenstein) and Filtek Z350XT (3M, ESPE, St. Paul, MN, USA) resin composites, with and without polishing, after being immersed in a 0.12% chlorhexidine (CHX)-based mouthwash at different times. The present in vitro experimental and longitudinal study used 96 nanohybrid resin composite blocks (Forma, Tetric N-Ceram and Filtek Z350XT) 8 mm in diameter and 2 mm thick, evenly distributed. Each resin composite group was divided into two subgroups (n = 16) with and without polishing and then immersed in a 0.12% CHX-based mouthwash for 7, 14, 21 and 28 days. Color measurements were performed with a calibrated digital spectrophotometer. Nonparametric tests were used to compare independent (Mann–Whitney U and Kruskal–Wallis) and related (Friedman) measures. In addition, the Bonferroni post hoc correction was used considering a significance level of p < 0.05. All polished and unpolished resin composites presented color variation < 3.3 when immersed for up to 14 days in 0.12% CHX-based mouthwash. The polished resin composite with the lowest color variation (ΔE) values over time was Forma, and the one with the highest values was Tetric N-Ceram. When comparing the color variation (ΔE) over time, it was observed that the three resin composites, with and without polishing, presented a significant change (p < 0.001), although these changes in color variation (ΔE) were evident from 14 days between each color acquisition (p < 0.05). The unpolished Forma and Filtek Z350XT resin composites showed significantly more color variation than the same polished ones at all times when immersed in a 0.12% CHX-based mouthwash for 30 s daily. In addition, every 14 days, all three resin composites with and without polishing showed a significant color change, while, every 7 days, color stability was maintained. All the resin composites showed clinically acceptable color stability when exposed for up to 14 days to the above-mentioned mouthwash.
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