Dental composites for wide color matching

Humbel, Mattia; Mattle, Corinne; Scheel, Mario; Díaz, Ana; Jerjen, Iwan; Lominski, Robert; Sterchi, Robert; Schulz, Georg E.; Izquierdo, A.; Sigron, Guido; Deyhle, Hans; Müller, Bert

doi:10.1117/12.2613110

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…6 (a). The exception is Omnichroma with a peak of 1% transmittance at a wavelength of 267.5 nm [19], which corresponds to the diameter of the spherical ceramic fillers [18]. In the visible range, see Fig.…”

Section: Spectrophotometrymentioning

confidence: 99%

Hard x-ray nanotomography of dental composites for wide color matching

Tripkis,

Humbel,

Deyhle

et al. 2024

Bioinspiration, Biomimetics, and Bioreplication XIV

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Caries affects billions of individuals worldwide, thus pointing out the importance of advancements in restorative dentistry. Dental resin composites yield restorations with satisfying mechanical properties, therefore the focus of development has shifted to accelerated treatments and esthetic aspects. Challenges in matching tooth color arise due to limited options, application changes, and color variations over time. Single-shade composites with the 'chameleon effect' adapt their color to the surrounding enamel by closely matching the tooth's optical spectrum, enhancing color blending. Structural color, based on light interference, contributes to this effect. The study investigates the submicron filler particles' impact on optical properties and the chameleon effect. Four single-shade dental resin composite materials were investigated. Needle-like samples about 100 μm in diameter were prepared and imaged in a scanning electron microscope. Light transmission through the materials for wavelengths between 200 and 900 nm was measured using a spectrophotometer. Threedimensional nanotomography data were obtained through transmission X-ray microscopy at the ANATOMIX beamline, Synchrotron SOLEIL, France in both absorption and Zernike phase contrast mode with 23 nm voxel size. The real space information was complemented with small-angle X-ray scattering. These experiments revealed substantial differences in the microscopic structure of the materials. In the case of Omnichroma, the filler consists of almost identical spheres with a diameter of 260 nm while Filtek Universal exhibits polydisperse, irregularly shaped fillers. Additionally, Venus Pearl One's fillers have a polyhedral shape and a wide size distribution. Finally, the setups used did not reveal any clearly identified microstructure of the Chroma Fill composite. Although all investigated materials are known to exhibit the chameleon effect, their differences in micro-and nanostructure call into question previous hypotheses on the chameleon effect's origin from structural color. While we have now a reasonable understanding of filler morphology, size distribution and spatial arrangement, more information is needed on the exact chemical composition of filler and matrix and their interaction with electromagnetic waves, including possible nonlinear effects.

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Section: Spectrophotometrymentioning

confidence: 99%

Hard x-ray nanotomography of dental composites for wide color matching

Tripkis,

Humbel,

Deyhle

et al. 2024

Bioinspiration, Biomimetics, and Bioreplication XIV

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“…Aesthetics is a significant concern for patients seeking dental treatment. Resin composite is a commonly used direct restorative material, and achieving a proper colour match with the adjacent teeth is crucial initially and over time [ 1 , 2 , 3 ]. However, frequent exposure of resin composite to beverages can result in discolouration [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…Two whitening methods that have been discussed are: (1) in-office, performed by a dental professional; this method uses photo-activation and stimulates colour changes from the first session; and (2) at-home (over-the-counter) [8]. At-home whitening is more costeffective for the patient than the in-office approach [4].…”

Section: Introductionmentioning

confidence: 99%

Colour Parameters and Changes of Tea-Stained Resin Composite Exposed to Whitening Pen (In Vitro Study)

et al. 2023

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Background: One of the crucial factors influencing the longevity of anterior aesthetic dental restorations is the colour stability of resin composites. Bleaching and whitening have become popular methods for enhancing dental aesthetics. Home whitening techniques, such as special pens, are widely available commercially. This in vitro study aimed to determine the efficiency of a whitening pen in removing tea stains from resin composite by measuring colour differences (ΔE00). Additionally, the study aimed to evaluate the variations in colour parameters measured by extra-oral and intra-oral spectrophotometers. Methods: A total of 45 disc-shaped resin composite specimens were randomly divided into three groups; Group 1: stored in artificial saliva (control), Group 2: stored in artificial saliva followed by a whitening pen application, and Group 3: stored in tea followed by a whitening pen application. Colour measurements were taken three times for each specimen using two spectrophotometers (extra-oral and intra-oral devices); T1: before storage (baseline), T2: after storage in artificial saliva or tea for 6 days; and T3: after one week of whitening pen application in groups 2 and 3. The data were statistically analyzed using one-way ANOVA followed by the Tukey post hoc test (p ≤ 0.05). The independent sample t-test was also employed. The equation of CIEDE2000 (ΔE00) was used to calculate the colour difference between the dry, as-prepared specimens (baseline), and those after storage or bleaching. The colour changes exceeding the acceptability threshold (∆E00 = 1.8) were considered unacceptable. Results: After whitening, the colour of the specimens stored in brewed tea (Group 3) remained unacceptable, as indicated by both the extra-oral and intra-oral spectrophotometers (ΔE00 = 4 and 2.9, respectively). Groups 1 and 2 exhibited lower ΔE00 values than Group 3 (p = 0.01 *). No significant difference was observed between Group 1 (stored in artificial saliva) and Group 2 (stored in artificial saliva and then bleached) (p = 0.3). Significant differences were consistently observed between the data obtained from the extra-oral spectrophotometer and the intra-oral one. Conclusions: The whitening pen proved ineffective in removing tea stains from resin composites. Although significant differences were found between the values obtained by the two spectrophotometers (extra-oral and intra-oral), both devices confirmed the unacceptable colour of the tea-stained resin composites after whitening.

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