Colour stability and opacity of resin cements and flowable composites for ceramic veneer luting after accelerated ageing

Archegas, Lucí Regina Panka; Freire, Andrea; Vieira, Sérgio; Caldas, Danilo Biazzetto de Menezes; Souza, E. M.

doi:10.1016/j.jdent.2011.08.013

Cited by 125 publications

(171 citation statements)

References 38 publications

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“…5 In some situations, lightcured resin cements have been indicated, because of their color stability and longer working time. 6 However, their maximum degree of conversion (DC) cannot be ensured in situations where light has been attenuated. Therefore, dual-cured luting materials are good options.…”

Section: Declaration Of Interestsmentioning

confidence: 99%

Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

et al. 2013

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This study evaluated: I) the effect of photo-activation through ceramics on the degree of conversion (DC) and on the Knoop hardness (KHN) of light-and dual-cured resin cements; and II) two different protocols for obtaining the spectra of uncured materials, to determine the DC of a dual-cured resin cement. Thin films of cements were photoactivated through ceramics [feldspathic porcelain (FP); lithium disilicate glass-ceramics of low translucency (e.max-LT), medium opacity (e.max-MO) and high translucency (e.max-HT); glass-infiltrated alumina composite (IC) and polycrystalline zirconia (ZR)] with thicknesses of 1.5 and 2.0 mm. DC was analyzed by Fourier transform infrared (FTIR) spectroscopy. Two protocols were used to obtain the spectra of the uncured materials: I) base and catalyst pastes were mixed, and II) thin films of base and catalyst pastes were obtained separately, and an average was obtained. KHN assessment was performed with cylindrical specimens. The results were analyzed by ANOVA and Tukey's test (α = 0.05). The light-cured cement showed higher DC (61.9%) than the dual-cured cement (55.7%). The DC varied as follows: FP (65.4%), e.max-HT (65.1%), e.max-LT (61.8%), e.max-MO (60.9%), ZR (54.8%), and IC (44.9%). The light-cured cement showed lower KHN (22.0) than the dual-cured (25.6) cement. The cements cured under 1.5 mm spacers showed higher KHN (26.2) than when polymerized under 2.0 mm ceramics (21.3). Regarding the two protocols, there were significant differences only in three groups. Thus, both methods can be considered appropriate. The physical and mechanical properties of resin cements may be affected by the thickness and microstructure of the ceramic material interposed during photo-activation.

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Section: Declaration Of Interestsmentioning

confidence: 99%

Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

et al. 2013

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“…Ceramic systems with different levels of opacity are commercially available, and DC results could be different if ceramics presenting other opacities and microstructures were evaluated. More opaque ceramics tend to absorb more light, which would decrease the DC of light-cured resin-based materials 20 . It has been reported that the DC of resin-based materials may change considerably as function of the type and opacity of the interposing ceramics [13][14] .…”

Section: Discussionmentioning

confidence: 99%

“…Other important factors to be considered are the exposure time and interposed ceramic opacity. Archegas et al 20 (2011) observed that opaque ceramic resulted in lower degree of conversion, hardness and elasticity modulus of resin-based cements. An exposure time of 120 s produced higher degree of conversion values for all materials, regardless the opacity of the ceramic.…”

Section: Discussionmentioning

confidence: 99%

Degree of conversion of a flowable composite light-activated through ceramics of different shades and thicknesses

Furuse

Glir²,

Rizzante

et al. 2015

Braz. J. Oral Sci.

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The cementation of thin ceramic veneers employing fluid light-activated resin-based materials is a common procedure in the dental practice. Aim: To evaluate the influence of ceramic thickness and shade on the degree of conversion (DC) of a flowable light-activated material. Methods: flowable resin composite (Tetric N-Flow -shade A1) was light-activated through ceramic discs of two shades (IPS Classic -A1 and A3) in three thicknesses (0.5, 0.7 and 1.0 mm). For control, the resin composite was light-activated without ceramic interposition. DC was evaluated by FTIR (n=5). Data were analyzed by one-way ANOVA and Dunnett's T3 test (α=0.05). Results: Statistically significant differences between groups were observed (p<0.001). Control group (without the interposition of ceramic) showed the highest mean for DC (71.9± 1.7). Considering the interposed ceramic disc groups, the highest DC values were obtained when 0.5 and 0.7 mm A1 ceramics were used (64.6±1.2 and 64.4 5.0, respectively) and the lowest DC values were obtained for 0.7 and 1 mm A3 ceramics (61.74±0.9 and 62.0±1.9, respectively). Conclusions: No flowable resin composite group with interposing ceramics reached a DC similar to the control group.

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“…This unintended result is due to the human eye's heightened sensitivity to value, more so than discrepancies in chroma or hue (Awad, Stawarczyk, Liebermann, & Ilie, 2015 (Bayindir & Ozbayram, 2017;Yuan et al, 2007). However, other studies support a ΔE * ab > 3.3 as clinically unacceptable, so individual judgments must be made if a ΔE * ab value falls in between the discrepancy (Archegas, Freire, Vieira, Caldas, & Souza, 2011;Knezovic, Zlataric, Illes, Alajbeg, & Zagar, 2015).…”

Section: Optical Qualities and Spectrophotometersmentioning

confidence: 99%

“…Currently, these cements are available in auto-, light-, and dual-polymerizing systems (Marchionatti et al, 2017). Light-activated resin cements are traditionally designed for thinner all-ceramic restorations and offer longer handling times prior to a rapid hardening when cured (Archegas et al, 2011). Auto-polymerizing resin cements are commonly designed for bonding to metal or high-strength ceramics.…”

Section: Luting Techniquesmentioning

confidence: 99%

Effect of porcelain thickness and translucency on the final shade of IPS e.max CAD overlaying a dark substrate.

Alena¹

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Colour stability and opacity of resin cements and flowable composites for ceramic veneer luting after accelerated ageing

Cited by 125 publications

References 38 publications

Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

Degree of conversion of a flowable composite light-activated through ceramics of different shades and thicknesses

Effect of porcelain thickness and translucency on the final shade of IPS e.max CAD overlaying a dark substrate.

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