Layering of discolored substrates with high-value opaque composites for CAD-CAM monolithic ceramics

Dotto, Lara; Machado, Pablo Soares; Slongo, Stefany; Pereira, Gabriel Kalil Rocha; Bacchi, Ataís

doi:10.1016/j.prosdent.2021.03.034

Cited by 5 publications

(11 citation statements)

References 15 publications

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“…It is important to note that as the substrate was darker ( Figure 5 ), the total color difference was mainly influenced by the lightness shift, whereas when it was more chromatic, the hue and chroma shifts were higher, increasing in both cases the total color difference in the three areas evaluated. This again highlights the significant influence that the substrate has on the masking capacity [ 13 , 14 , 17 , 37 ].…”

Section: Discussionmentioning

confidence: 99%

“…In a study evaluating the effect of the direct layering of substrates with high-value composite resins on the masking ability of CAD-CAM materials, the authors concluded that the layering with 0.25 mm opaque resins reduced the color differences for veneered zirconia [ 37 ]. However, the authors used 1.8 mm thick restorations, which might involve excessive tooth preparation.…”

Section: Discussionmentioning

confidence: 99%

“…Although extensive research has been recently conducted on the masking ability of restorative materials [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], there is still missing information on how color differences might impact visual perception when translucent restorations are evaluated over different discolored substrates. Furthermore, there is little information about the colorimetric behavior of monolithic and layered zirconia crowns in combination with various abutment colors.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, there is little information about the colorimetric behavior of monolithic and layered zirconia crowns in combination with various abutment colors. Most studies evaluated the masking ability using rectangular or disc samples [ 12 , 13 , 15 , 16 , 17 , 19 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], which do not reproduce the clinical conditions met in the oral cavity.…”

Section: Introductionmentioning

confidence: 99%

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Masking Ability of Monolithic and Layered Zirconia Crowns on Discolored Substrates

et al. 2022

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There is scarce information on the colorimetric behavior of monolithic and layered zirconia crowns in combination with various abutment colors. This study evaluated the masking ability on discolored substrates of monolithic and layered zirconia crowns. Anterior crowns were fabricated using 3Y-TZP zirconia and layering ceramic and divided into three groups: monolithic (ML), bi-layer (BL), and tri-layer (TL). The crowns were placed over eleven substrates (ND1-ND9, zirconia, metal), and CIE L*, a*, b*, C*, and h° color coordinates were measured in the cervical, middle, and incisal areas with a spectrophotometer. Masking ability was calculated using the color difference formula, and values were interpreted according to the perceptibility and acceptability thresholds. Data were analyzed statistically (α = 0.001). The L* coordinate was not significantly different between BL and TL crowns, regardless of the measurement area or substrate (p ≥ 0.001). In the middle area, the L* coordinate of the ML group was statistically different from the BL and TL groups only for zirconia and metal substrates, while in the incisal area, only for ND7 and metal substrates. The a* coordinate was significantly different between the ML and layered crowns for all measurement areas and substrates (except zirconia). The b* and C* coordinates differed significantly between the groups only in the cervical area (p < 0.001). The ML crown had better masking ability than the BL and TL crowns. However, the color differences for ML crowns were below the acceptability threshold for ND2, ND3, and ND7 substrates in the cervical and middle areas and below perceptibility threshold only for the incisal area. The lowest masking ability of the crowns was found for ND9 and metal substrates in all measurement areas.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Masking Ability of Monolithic and Layered Zirconia Crowns on Discolored Substrates

et al. 2022

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“…5,6 Bilayer systems, such as porcelain-veneered zirconia copings still consist the most reliable method to mask substrates, including metallic abutments, Polietheretherketone, and discolored tooth structures. [7][8][9] Monolithic ceramic systems present improved mechanical performance 1,4 since they avoid chipping and delamination of veneering ceramic, which are common types of failures in bilayer restorations. 10 Besides, the milling of monolithic restorations reduces the operator dependency, since there is no need for porcelain stratification, optimizing the treatment and allowing a complete digital workflow.…”

Section: Introductionmentioning

confidence: 99%

Resin composite layering on discolored substrates ensures masking ability for monolithic ceramics

Machado

Pereira

Bacchi³

2023

J Esthet Restor Dent

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Objectivethe aim of this study was to evaluate the effect of resin composite layering on discolored substrates to obtain masking ability with monolithic ceramics.Materials and MethodsFour groups (n = 8) of computer‐aided design/computer aided manufacturing (CAD/CAM) monolithic ceramics, shade A1, with thicknesses of 1.0 and 1.5 mm, were tested: feldspathic (FC), leucite‐reinforced (LC), lithium disilicate‐reinforced (LD), and translucent zirconia (5YSZ). Five substrates were used: A1 (used as reference), A3.5, C4, and coppery and silvery metals. The substrates were separated as non‐layered or layered (with flowable opaque resin composite (FL), white opaque restorative resin composite (WD), and A1‐shaded opaque restorative resin composite (A1D)). Resin composite layers of 0.5 and 1.0 mm were tested. The try‐in paste, shade A1, was used as a luting agent. Translucency parameter (TP00) was assessed for the ceramics. Color differences (∆E00) were assessed for the restorative ceramics and resin composite layers over discolored substrates with the CIEDE2000 formula. The results were compared statistically, and descriptively with acceptability (AT, 1.77) and perceptibility (PT, 0.81) thresholds.ResultsFeldspathic showed the highest TP00 (for both ceramic thicknesses) and LD the lowest (for 1.5 mm of ceramic thickness) (P < 0.001). For substrate A3.5, layering with 1.0 mm of A1D or WD ensured ∆E00 below PT for all ceramics tested (P < 0.001). The use of 0.5 mm of FL or 1.0 mm of A1D associated with ceramics LC, LD, and 5YSZ ensured ∆E00 below AT for substrates C4 and coppery metal (P < 0.001). Silvery background layered with 0.5 mm of FL presented ∆E00 below AT for all ceramics and ∆E00 below PT for lithium disilicate of 1.0 mm of thickness (∆E00 = 0.72).ConclusionsLayering severely discolored substrates with selected opaque resin composites ensures masking ability for restoration with CAD/CAM monolithic ceramics.Clinical SignificanceSeverely discolored substrates are predictably restored with monolithic CAD/CAM ceramics by performing a previous layering of the substrate with opaque resin composite.

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Advances in Ceramics for Dental Applications

Bacchi¹,

César

2022

Dental Clinics of North America

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Layering of discolored substrates with high-value opaque composites for CAD-CAM monolithic ceramics

Cited by 5 publications

References 15 publications

Masking Ability of Monolithic and Layered Zirconia Crowns on Discolored Substrates

Masking Ability of Monolithic and Layered Zirconia Crowns on Discolored Substrates

Resin composite layering on discolored substrates ensures masking ability for monolithic ceramics

Advances in Ceramics for Dental Applications

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