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

Furuse, Adilson Yoshio; Glir, Daniel Hatschbach; Rizzante, Fábio Antônio Piola; Prochnow, Rayane Alexandra; Borges, Ana Flávia Sanches; Gonzaga, Carla Castiglia

doi:10.1590/1677-3225v14n3a11

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…Some studies found that thickness and translucency were not a major factor in the extent of polymerization of the resin cement. However, these studies examined specimens that were relatively thin (1.5 mm or less) and hence the effects of the differing translucencies may not have been as significant [29,30]. Others had other issues with not ensuring that the curing light was calibrated as the output of light can deteriorate over time [31,32].…”

Section: Discussionmentioning

confidence: 99%

Effects of Ceramic Translucency and Thickness on Polymerization of a Photosensitive Resin Cement

Barazanchi,

Abduo,

Lee

et al. 2023

Oral

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We investigated the effects of lithium disilicate ceramic thickness and translucency on the degree of polymerization of light-cured resin cement using the measure of hardness. Lithium disilicate specimens of three translucencies (low, medium and high) were prepared to four thicknesses (0.5, 1.0, 2.0 and 3.0 mm). A light-cured resin cement was cured through each of the ceramic specimens using a handheld curing light for 50 s. A 3D printed jig was used to achieve a uniform thickness of the resin cement. Directly cured resin cement was used as the control. Hardness was measured using nano-indentation to determine the degree of polymerization of the resin cement. Two-way ANOVA and Tukey post hoc tests were used to evaluate interaction between translucency and thickness. Hardness values from control specimens were assessed using the two-tailed t-test with the Bonferroni approach. The translucency of the specimens significantly influenced the hardness (p < 0.001), where a negative linear relationship between cement hardness and ceramic thickness was present for low translucency and high translucency. However, at a 0.5 mm thickness, all specimens showed similar hardness regardless of the translucency. The translucency of ceramics affected the hardness, and hence polymerization, of light-cure resin cement. However, the effect of increased thickness was a more significant factor.

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Section: Discussionmentioning

confidence: 99%

Effects of Ceramic Translucency and Thickness on Polymerization of a Photosensitive Resin Cement

Barazanchi,

Abduo,

Lee

et al. 2023

Oral

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“…Depending on the type, thickness, and color of the ceramic, the radiant exposure may not be enough due to attenuation, compromising the polymerization process. [ 21 22 23 24 ]…”

Section: Discussionmentioning

confidence: 99%

Influence of light activation of simplified adhesives on the shear bond strength of resin cements to a leucite-reinforced ceramic

et al. 2018

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Objective:This study aims to evaluate the influence of the light activation of simplified adhesives on the shear bond strength of resin cements to a glass-ceramic. Three factors were evaluated: (1) cement in two levels (light cured and dual cured); (2) adhesive in two levels (Single Bond 2 and Single Bond Universal), and (3) light activation in two levels (yes or no).Materials and Methods:Thirty-two 1-mm thick slices of a leucite-reinforced glass-ceramic (IPS Empress CAD) were divided into eight groups according to adhesive (Single Bond 2 or Single Bond Universal), cement (AllCem Veneer or AllCem), and light activation of the adhesive before application of the cement (yes or no). Ceramic surfaces were etched for 60 s with 5% hydrofluoric acid, and adhesives were applied. Four cement cylinders were made over each ceramic slice (n = 16) and then submitted to shear bond strength tests.Statistical Analysis:Data were analyzed with three-way ANOVA and Tukey (α = 0.05).Results:There were significant differences between adhesives (P < 0.0001) and no differences between cements (P = 0.0763) and light activation (P = 0.4385). No interaction effect occurred (P = 0.05). Single Bond 2 showed higher bond strength than Single Bond Universal.Conclusions:The light activation of the adhesive before the application of the resin cement did not influence the bond strength.

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“…Dentists who wish to avoid the heating procedure can use high-filled flowable resin composites for bonding purposes (Furuse at al., 2015 , Mutlu et al., 2021 ). However, it is important to note that there is currently a lack of investigation regarding these specific luting procedures for indirect ceramic and composite restorations.…”

Section: Introductionmentioning

confidence: 99%

The influence of pre-heating the restoration and luting agent on the flexural strength of indirect ceramic and composite restorations

Tribst,

Etoeharnowo,

Tadros

et al. 2023

Biomaterial Investigations in Dentistry

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Background This study investigated the impact of luting procedure and restoration thicknesses on the flexural strength of CAD/CAM restorations. Traditional luting agents have been questioned in favor of pre-heated resin composites or flowable composites. Materials and Methods 400 disc-shaped restorations (lithium disilicate [IPS e.max CAD] or resin composite [Tetric CAD, Ivoclar]) were cemented onto dentin analog discs using different procedures (n = 20): dual-curing resin cement (Panavia V5), light-curing resin cement (Panavia Veneer LC), pre-heated resin composite (Clearfil™ AP-X) with or without pre-heated restoration, and high-filled flowable composite (Clearfil Majesty™ Flow). The biaxial flexural strength was calculated. Results There were significant effects of material, thickness, and luting procedure on flexural strength (p < 0.001). Resin composite specimens exhibited lower flexural strength (90 MPa) compared to lithium disilicate specimens (571 MPa), with thicker restorations (338 MPa) being stronger than thinner ones (323 MPa). Light-curing cement showed the highest strength (408.8 MPa) A , followed by dual-curing cement (362 MPa) B , pre-heated cement with pre-heated composite (318 MPa) C , pre-heated composite (304 MPa) C , and flowable resin composite (259 MPa) D . The light-curing cement yielded similar results to the pre-heated resin composite associated or not with the pre-heated crown for the thicker lithium disilicate specimens, whereas for the thinner lithium disilicate specimens all luting procedures performed similarly. Thin resin composite discs showed higher flexural strength when luted with light-curing cement, whereas the luting procedure had less influence for the thicker restorations. Conclusion Luting procedures impact the flexural strength of CAD/CAM lithium disilicate and resin composite restorations. Pre-heated resin composite, with or without pre-heated restoration, can replace dual-curing cement. Nevertheless, light-curing cement is superior for resin composite and 1.5 mm lithium disilicate restorations.

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

Cited by 7 publications

References 21 publications

Effects of Ceramic Translucency and Thickness on Polymerization of a Photosensitive Resin Cement

Effects of Ceramic Translucency and Thickness on Polymerization of a Photosensitive Resin Cement

Influence of light activation of simplified adhesives on the shear bond strength of resin cements to a leucite-reinforced ceramic

The influence of pre-heating the restoration and luting agent on the flexural strength of indirect ceramic and composite restorations

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