Using Kubelka-Munk reflectance theory to predict optimal pink composite thickness and shade with an opaqued PEEK background for a final gingival color: An in vitro study

Gouveia, Diogo; Yılmaz, Burak; Çevik, Pınar; Johnston, William M.

doi:10.1016/j.dental.2022.06.027

Dental Materials

2022

DOI: 10.1016/j.dental.2022.06.027

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Using Kubelka-Munk reflectance theory to predict optimal pink composite thickness and shade with an opaqued PEEK background for a final gingival color: An in vitro study

Diogo Gouveia

Burak Yılmaz

Pınar Çevik

et al.

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Cited by 8 publications

(1 citation statement)

References 31 publications

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“…Besides, the CIELAB formula (ΔE* ab ) is still used for the gingiva-colored tissues and materials. [21][22][23] Limited studies in the literature focus on the DC and color stability of gingiva-colored composites 5,24 The long-term aging effects of heat, humidity, UV light, vapor, and postpolymerization process are not negligible parameters on the color stability of gingiva-colored composites. Moreover, little is known about the reflectance characteristics of gingivacolored composite resins after polymerization.…”

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confidence: 99%

Determination of the degree of conversion, the diffuse reflectance, and the color stability after different aging processes of gingiva‐colored composite resins

Kalyoncuoğlu

Yılmaz

Sipahi

2023

Journal of Prosthodontics

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PurposeTo determine the degree of conversion (DC) and spectral diffuse reflectance of four different gingiva‐colored composites and to evaluate their color stability after various aging processes.Materials and MethodsThe gingiva‐colored composites were assigned to four experimental groups (Anaxgum (AG), Crea.lign paste Gum (CB), Gradia Gum (GR), SR Nexco Gum (NC)). A total of 120 disc‐shaped specimens (10 × 2 mm) (n = 30/group) were polymerized in a Teflon mold. The nature of chemical bonding was studied by Fourier transform infrared spectroscopy (FTIR). Diffuse reflection spectra of the polymerized specimens were gathered using an ultraviolet‐visible‐near infrared (UV‐Vis‐NIR) spectrophotometer. Specimens subjected to aging methods were divided into three subgroups (n = 10): ultraviolet aging, hydrothermal aging, and autoclave aging. Color differences (ΔE*ab and ΔE00) were determined by colorimetry before and after aging. The statistical analysis was done using a two‐way ANOVA along with paired sample t‐test and Bonferroni's post hoc test.ResultsConversion degrees varied between 26.9% and 59.7% and all groups showed 3 or 4 maxima at different positions in the visible region of the spectrum. Both ΔE*ab and ΔE00 values were significantly different from the groups of different brands for all types of aging processes. Similarly, there were significantly different ΔE*ab and ΔE00 values according to the aging procedure for all groups of particular brands, except for ΔE00 of SR Nexco Gum (NC).ConclusionsThe aging procedures resulted in significant color differences between similar shades of four commercial gingiva‐colored composites. The composite resins showed different degrees of conversion and diffuse reflectance spectra. The aging conditions tested affected the color stability. Patients with gingiva‐colored indirect restorations should be informed about time‐dependent discoloration.

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confidence: 99%

Determination of the degree of conversion, the diffuse reflectance, and the color stability after different aging processes of gingiva‐colored composite resins

Kalyoncuoğlu

Yılmaz

Sipahi

2023

Journal of Prosthodontics

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Masking ability of gingiva-colored resin-based composites over different tooth-colored substrates

Şen,

Sancaklı

2024

Odontology

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The purpose of the study was to investigate the influence of different tooth-colored substrates and restoration thicknesses on the final color of gingiva-colored resin-based composites (GCRBCs). Five different shades of GCRBCs [light pink (LP), dark pink (DP), orange (Or), brown (Br), and purple (P)] were used to prepare disc-shaped specimens with 2 different thicknesses: 1.0 mm, and 2.0 mm. GCRBC discs (n = 5) were placed over 3 different tooth-colored substrates (ND1, ND5, and ND9) and color parameters were assessed using a spectroradiometer. Color differences (∆E*ab and ∆E00) were calculated using CIELab and CIEDE2000 formulas and compared to 50:50% perceptibility (PT: ∆E*ab = 1.7, ΔE00 = 1.1) and acceptability (AT: ∆E*ab = 3.7, ΔE00 = 2.8) visual thresholds. Color variation data were statistically analyzed using two-way ANOVAs followed by Bonferroni’s post hoc tests (a = 05). The ∆E*ab and ΔE00 values of GCRBCs placed over ND9 substrates were significantly higher in the LP-1.0 mm and Or-1.0 mm groups that presented values above AT (p< .001).Regardless of the substrate color and GCRBC thickness applied, ∆E*ab and ΔE00 values below AT were recorded in the gingival color groups of P. Substrate color significantly affected the color differences in the gingival color groups of LP, DP, and Or with a restoration thickness of 1.0 mm (p < .05). Gingival color, restoration thickness, and substrate color influenced the color differences of GCRBCs. When the gingival color was a lighter gingival color, rather than dark purple, the masking ability was decreased, especially with a restoration thickness of 1.0 mm.

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Research on Spectral Measurement Method for Content of Bicolor Mixed Ink

Fang,

Zhang,

Zhang

et al. 2024

J Appl Spectrosc

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Using Kubelka-Munk reflectance theory to predict optimal pink composite thickness and shade with an opaqued PEEK background for a final gingival color: An in vitro study

Cited by 8 publications

References 31 publications

Determination of the degree of conversion, the diffuse reflectance, and the color stability after different aging processes of gingiva‐colored composite resins

Determination of the degree of conversion, the diffuse reflectance, and the color stability after different aging processes of gingiva‐colored composite resins

Masking ability of gingiva-colored resin-based composites over different tooth-colored substrates

Research on Spectral Measurement Method for Content of Bicolor Mixed Ink

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