IADR Abstract Archives
Color Change of 3D-Printed Resins Immersed in Red Wine Staining Solution
Objectives: The purpose of this study was to compare the staining resistance of four 3D-printed resins upon exposure to a staining solution simulating 6 months in-vivo.
Methods: Three 3D-printer resins marketed for definitive crowns were compared: Formlabs Permanent Crown Resin (Formlabs, Somerville, MA), SprintRay Ceramic Crown and SprintRay Crown by BEGO (both from SprintRay, Los Angeles, CA); a fourth material designed for printing dentures (OnX, also from SprintRay) was tested as well. Materials were printed as 10mm x 2mm disks and followed manufacturer instructions for printing and post-print processing, including wash and cure protocols. Discs were stored at approximately 25°C for up to ten days before embedding in acrylic blocks for automated wet grinding/polishing through 2500-grit paper (AutoMet 250 Grinder/Polisher, Buehler, Lake Bluff, IL).
Color (L*a*b*) values of each sample were measured using a BYK-Gardner Color Meter (BYK, Wesel, Germany). After measurement, samples were immersed in red wine in a sealed jar for 6 days, rinsed with RO water, and L*a*b* values of stained samples measured.
CIEDE2000 ΔE and whiteness values (Paravina et al. 2019) were calculated using python library colormath. ANOVA with post-hoc Tukey tested between-group differences in ΔE. Repeated measures ANOVA tested for differences in the magnitude change of whiteness before and after staining (α=0.05).
Results: Results showed significant differences in ΔE for both black and white backgrounds (p-value=0.009, F=4.376, p-value=0.026, F=3.361 respectively). Post-hoc tests showed that SprintRay Crown by BEGO had comparably lower ΔE and SprintRay OnX had comparably higher values. Results for whiteness values show significant differences in whiteness values over time by printed material type (black background: p-value<0.05, F=3.518, white background: p-value<0.05, F=3.397). All groups show a decrease in whiteness after staining, but these decreases are lower for SprintRay Crown by BEGO.
Conclusions: These results suggest that SprintRay Crown by BEGO has the greatest stain resistance, while the denture material, OnX, had the lowest resistance.
Methods: Three 3D-printer resins marketed for definitive crowns were compared: Formlabs Permanent Crown Resin (Formlabs, Somerville, MA), SprintRay Ceramic Crown and SprintRay Crown by BEGO (both from SprintRay, Los Angeles, CA); a fourth material designed for printing dentures (OnX, also from SprintRay) was tested as well. Materials were printed as 10mm x 2mm disks and followed manufacturer instructions for printing and post-print processing, including wash and cure protocols. Discs were stored at approximately 25°C for up to ten days before embedding in acrylic blocks for automated wet grinding/polishing through 2500-grit paper (AutoMet 250 Grinder/Polisher, Buehler, Lake Bluff, IL).
Color (L*a*b*) values of each sample were measured using a BYK-Gardner Color Meter (BYK, Wesel, Germany). After measurement, samples were immersed in red wine in a sealed jar for 6 days, rinsed with RO water, and L*a*b* values of stained samples measured.
CIEDE2000 ΔE and whiteness values (Paravina et al. 2019) were calculated using python library colormath. ANOVA with post-hoc Tukey tested between-group differences in ΔE. Repeated measures ANOVA tested for differences in the magnitude change of whiteness before and after staining (α=0.05).
Results: Results showed significant differences in ΔE for both black and white backgrounds (p-value=0.009, F=4.376, p-value=0.026, F=3.361 respectively). Post-hoc tests showed that SprintRay Crown by BEGO had comparably lower ΔE and SprintRay OnX had comparably higher values. Results for whiteness values show significant differences in whiteness values over time by printed material type (black background: p-value<0.05, F=3.518, white background: p-value<0.05, F=3.397). All groups show a decrease in whiteness after staining, but these decreases are lower for SprintRay Crown by BEGO.
Conclusions: These results suggest that SprintRay Crown by BEGO has the greatest stain resistance, while the denture material, OnX, had the lowest resistance.
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