SUMMARY: The aim of this study was to examine the color change of single-shade resin composites, which can be used for all tooth shades. In this study, samples were prepared using resin composites with single-shade (Omnichroma, Vitra Unique) and multishade composite systems (G-aenial A’Chord, Clearfil Majesty ES-2 Premium). The initial color values were measured with a spectrophotometer. Then, samples were kept in wine, coffee, black tea, and distilled water and color measurements were made after days 1, 7, and 30. Color change (ΔE₀₀) and whiteness index (WI_D) values were statistically analyzed using a one-way analysis of variance (ANOVA) test (α=0.05). Single-shade resin composites showed more color change from wine, coffee, and black tea than multishade resin composites (p<0.001). Single-shade composites have a greater discoloration potential. Single-shade resin composites may show more color change from beverages than multishade resin composites, which may negatively affect clinical success.

The aim of this study was to investigate the effect of post-polymerization time and curing device type on the surface roughness, microhardness and color change of 3D printed permanent resin materials. In this study, permanent resin samples with a layer print thickness of 50 μm and dimensions of 10 × 2 mm3 were produced on SLA and DLP printers. The samples were post-polymerized in blue LED and UV LED curing devices for 10, 20, 40 and 60 min. Initial surface roughness, microhardness and color values of all polymerized samples were measured. The samples were then aged (5000 cycles) and surface roughness, microhardness and color values were measured again. Data were evaluated using two-way analysis of variance (ANOVA) and Tukey post hoc test (p < 0.05). There was no statistically significant difference in surface roughness when the samples produced in SLA and DLP printer were polymerized using blue LED and UV LED curing device for different durations (p > 0.05). The samples produced in SLA printer showed higher microhardness value when polymerized with UV LED for longer time (p < 0.05). There was no statistically significant difference in the microhardness values of DLP samples when polymerized with blue LED and UV LED (p > 0.05). When the samples produced in SLA and DLP printer were polymerized using blue LED and UV LED curing device for different durations, the color change and whiteness index increased as the post-polymerization time increased (p < 0.05). The surface roughness of the samples after aging did not change statistically significantly, while the microhardness value decreased (p < 0.05). The post-polymerization time and the type of polymerization device do not affect the surface roughness of the 3D printed samples, but increase the microhardness value. Post-polymerization time increases the color change and whiteness index values of the samples. Post-polymerization of 3D printer permanent resin materials has an effect on the mechanical and optical properties of the material. The post polymerization time of 3D resin materials and the type of curing device change the microhardness, color change and surface roughness of the material. This may affect the clinical success of the restoration.

Purpose: This study investigated discoloration and surface roughness (Ra) of resin-based computer aided design (CAD)/computer aided manufacturing (CAM) blocks and direct and indirect resin composites after staining with coffee. Materials & Methods: Using a Teflon mold, 60 disc shaped specimens (8×2 mm2) were fabricated from direct (Estelite Asteria and GrandioSO) and indirect (Gradia Plus) resin composites, and 30 resin CAD/CAM specimens (12×14×2 mm3) were prepared from resin composite CAD/CAM blocks (Vita Enamic, Brilliant Crios, and Cerasmart) (n=10). A contact type profilometer was used to determine the Ra of all 60 polished samples. All specimens were thermocycled between 5 and 55°C for 3000 cycles, and immersed in coffee solution (37°C) for 1 and 7 days. A spectrophotometer was used to determine the color change (∆E00) with the CIEDE2000 formula after the specimens were re-polished. One-way analysis of variance (ANOVA) and Tukey multiple comparison test was performed to analyze the data (p<0.05). Results: The lowest degree of discoloration among the materials tested was found in Vita Enamic resin CAD/CAM block (p<0.001), whereas the highest degree of discoloration was found in the Gradia Plus indirect composite (p<0.001). There was no significant difference was seen between the initial surface roughness values (Ra) among the groups (p=0.249). No significant improvement was observed in the color of the groups except for the Cerasmart resin block after after polishing. Conclusion: Direct resin composites have a higher discoloration potential over resin-based CAD/CAM blocks, whereas they are less prone to discoloration than indirect resin composites

The aim of this study was to investigate the surface roughness, gloss and microhardness values ​​of 3D-printed permanent resins after the use o

Objective: Composite resins are widely used in the restoration of teeth. The aim of this study is to examine the effect of modeling liquid use on the color and whiteness index changes of composite resins. Materials and Methods: In the study, samples were prepared using different composite resins (Clearfil Majesty Esthetic, Estelite Asteria, G-aenial A'Chord and Omnichroma). Before polymerization of the prepared samples, modeling liquid was applied to one group with a composite brush, while modeling liquid was not applied to the other group. After the polymerization process, the samples were polished using the finishing and polishing system (Clearfil Twist Dia). Color measurement of samples kept in coffee was measured at the beginning, at 7th and 30th days using spectrophotometer. CIEDE2000 (ΔE00) and whiteness index (WID) formulas were used to calculate color changes. Statistical analysis of the data was performed with one-way analysis of variance (ANOVA) and Tukey tests (p>0.05). Results: There was a statistically significant difference between the color and whiteness index change values of the composite resins on the 7th and 30th days (p0.05). The control group, which did not undergo finishing and polishing, showed the statistically highest color change (p>0.05). Conclusions: Composite resins showed change in color (ΔE00:1.8) and whiteness index (ΔWID:2.6) above the acceptable threshold value (AT) in coffee. The use of modeling liquid did not affect the color and whiteness index changes of the composite resins.

Aim: Resin-containing restorative materials are widely used in the restoration of teeth. Our aim in this study is to examine the color change of beverages consumed cold on resin-containing restorative materials. Methodology: Samples were prepared using composite resins and resin-based CAD/CAM blocks. All prepared samples were kept in cold tea, cold coffee, coke, energy drink, and distilled water after polishing. The color values of the samples were measured with a spectrophotometer at the beginning, on the 1st, 7th and 30th days, and the color change values were calculated with the CIEDE2000 formula. Statistical analysis of color change values was performed using two-way analysis of variance (ANOVA) and Tukey multiple comparison tests (p0.05), at the end of the 7th and 30th days, cold tea caused the statistically highest color change (p0.05). Composite resins showed more color change than resin-based CAD/CAM blocks (p<0.05). Conclusion: Cold tea causes the most discoloration on resin-based materials. While the resin-containing CAD/CAM blocks showed a color change under the AT value in all cold drinks, the composite resins showed a color change above the AT value in cold tea and coffee. How to cite this article: Altıparmak ET, Aybala Oktay E, Karaoğlanoğlu S, Aydın N, Ersöz B, Özarslantürk S. The effect of cold drinks on the coloration of resin-containing restorative materials. Int Dent Res 2022;12(1):14-20. https://doi.org/10.5577/intdentres.2022.vol12.no2.3 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.