Dental materials : official publication of the Academy of Dental Materials · 2026
Effect of postpolymerization unit characteristics on the color stability and relative translucency parameter of 3D printed interim resins.
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Lee Wanki, Kim Soyeon, Daud Alaa, Wang Jian, Park Young-Seok
Аннотация
OBJECTIVES: This study evaluated the effects of postpolymerization unit characteristics on the color stability and relative translucency parameter of three-dimensional (3D) printed interim crown and bridge resins under simulated aging.
METHODS: Four commercial resins were postpolymerized using five units. Spectral reflectance was measured before postpolymerization (T0), immediately afterward (T1), and after 6-month dry storage at 37 °C or 5000 thermocycles (T2). CIE L*a*b* (CIELAB) coordinates were calculated under CIE standard illuminant D65 using the CIE 1931 2° Standard Colorimetric Observer. The whiteness index for dentistry (WID) and CIEDE2000 color difference (ΔE00) were derived from black-background coordinates, whereas the CIEDE2000 relative translucency parameter (RTP00) was calculated from paired black- and white-background coordinates. Mean ΔL*, Δa*, and Δb* were evaluated using axis-specific visual thresholds, and T1-to-T2 ΔE00, |ΔWID|, and |ΔRTP00| using perceptibility and acceptability thresholds.
RESULTS: Postpolymerization generally reduced L* and WID, whereas RTP00 responses varied among resin-unit combinations. During dry storage, L* and WID generally increased, whereas thermocycling generally decreased RTP00. Several outcomes differed significantly among postpolymerization units within each resin (p < 0.005). For Tera Harz TC-80DP, Tera Harz Cure and ODS Cure Box maintained ΔE00, |ΔWID|, and |ΔRTP00| within acceptability thresholds under both aging conditions; with Tera Harz Cure, all three remained below perceptibility thresholds.
SIGNIFICANCE: Color and RTP00 stability depended on the specific resin-unit combination rather than manufacturer-designated pairing alone. Selected non-designated combinations showed acceptable in vitro outcomes. These findings support resin-specific selection based on verified performance of the complete postpolymerization protocol.
METHODS: Four commercial resins were postpolymerized using five units. Spectral reflectance was measured before postpolymerization (T0), immediately afterward (T1), and after 6-month dry storage at 37 °C or 5000 thermocycles (T2). CIE L*a*b* (CIELAB) coordinates were calculated under CIE standard illuminant D65 using the CIE 1931 2° Standard Colorimetric Observer. The whiteness index for dentistry (WID) and CIEDE2000 color difference (ΔE00) were derived from black-background coordinates, whereas the CIEDE2000 relative translucency parameter (RTP00) was calculated from paired black- and white-background coordinates. Mean ΔL*, Δa*, and Δb* were evaluated using axis-specific visual thresholds, and T1-to-T2 ΔE00, |ΔWID|, and |ΔRTP00| using perceptibility and acceptability thresholds.
RESULTS: Postpolymerization generally reduced L* and WID, whereas RTP00 responses varied among resin-unit combinations. During dry storage, L* and WID generally increased, whereas thermocycling generally decreased RTP00. Several outcomes differed significantly among postpolymerization units within each resin (p < 0.005). For Tera Harz TC-80DP, Tera Harz Cure and ODS Cure Box maintained ΔE00, |ΔWID|, and |ΔRTP00| within acceptability thresholds under both aging conditions; with Tera Harz Cure, all three remained below perceptibility thresholds.
SIGNIFICANCE: Color and RTP00 stability depended on the specific resin-unit combination rather than manufacturer-designated pairing alone. Selected non-designated combinations showed acceptable in vitro outcomes. These findings support resin-specific selection based on verified performance of the complete postpolymerization protocol.