Journal article
Effects of Post-Curing Duration on Color Changes in 3D-Printed Fixed Polymeric Restorations of Varying Thicknesses
The International journal of prosthodontics, Vol.38(6), pp.677-683
11/19/2025
DOI: 10.11607/ijp.8982
PMID: 40540638
Abstract
This study aimed to evaluate color changes in 3D-printed acrylic restorations of varying thicknesses and exposed to different post-curing durations.PURPOSEThis study aimed to evaluate color changes in 3D-printed acrylic restorations of varying thicknesses and exposed to different post-curing durations.Three virtual full-contour maxillary central incisor crowns with different buccal thicknesses (1.0, 1.5, and 2.0 mm) were designed and manufactured using a 3D printer and a photopolymer (n = 9 per thickness group). The lightness, hue, and chroma of the restorations were measured at baseline (prior to post-curing) and again at 5 min intervals up to 30 min during the post-curing process using a spectrophotometer. Color changes (ΔE) were calculated by comparing the CIE L*, a*, b* coordinates at different time points to the baseline values. Repeated-measures analysis of variance and the Tukey's post-hoc test were used for statistical analysis (α = .05).MATERIALS AND METHODSThree virtual full-contour maxillary central incisor crowns with different buccal thicknesses (1.0, 1.5, and 2.0 mm) were designed and manufactured using a 3D printer and a photopolymer (n = 9 per thickness group). The lightness, hue, and chroma of the restorations were measured at baseline (prior to post-curing) and again at 5 min intervals up to 30 min during the post-curing process using a spectrophotometer. Color changes (ΔE) were calculated by comparing the CIE L*, a*, b* coordinates at different time points to the baseline values. Repeated-measures analysis of variance and the Tukey's post-hoc test were used for statistical analysis (α = .05).The ΔE increased significantly within the first 5 min of post-curing and was more gradual thereafter in all thickness groups. The ΔE values were significantly higher in the 1.5 and 2.0 mm thickness groups compared to the 1.0 mm thickness group. The C* coordinate was seen to increase significantly within the first 5 min of post-curing, and did not change significantly afterward.RESULTSThe ΔE increased significantly within the first 5 min of post-curing and was more gradual thereafter in all thickness groups. The ΔE values were significantly higher in the 1.5 and 2.0 mm thickness groups compared to the 1.0 mm thickness group. The C* coordinate was seen to increase significantly within the first 5 min of post-curing, and did not change significantly afterward.During post-curing, the hue of a 3D printed polymeric restoration changed to yellowish and reddish shades, the brightness decreased, and the saturation increased. Most color changes occurred within the first 5 min of post-curing and were also more noticeable in thicker restorations.CONCLUSIONSDuring post-curing, the hue of a 3D printed polymeric restoration changed to yellowish and reddish shades, the brightness decreased, and the saturation increased. Most color changes occurred within the first 5 min of post-curing and were also more noticeable in thicker restorations.
Details
- Title: Subtitle
- Effects of Post-Curing Duration on Color Changes in 3D-Printed Fixed Polymeric Restorations of Varying Thicknesses
- Creators
- Ho-Jin Lee - Kyungpook National UniversitySeok-Hwan Cho - University of IowaChonghwa Kim - University of IowaHang-Nga Mai - Kyungpook National UniversityThaw Thaw Win - Kyungpook National UniversityShilpa Rana - Kyungpook National UniversityDu-Hyeong Lee - University of Iowa
- Resource Type
- Journal article
- Publication Details
- The International journal of prosthodontics, Vol.38(6), pp.677-683
- DOI
- 10.11607/ijp.8982
- PMID
- 40540638
- NLM abbreviation
- Int J Prosthodont
- ISSN
- 1942-4426
- eISSN
- 1942-4426
- Publisher
- Quintessence; HANOVER PARK
- Grant note
- Korea Medical Device Development Fund grant - Korean government (the Ministry of Science and ICT)Ministry of Trade, Industry and EnergyMinistry of Health & Welfare, Republic of KoreaMinistry of Food and Drug Safety: 202011A02
This work was supported by the Korea Medical Device Development Fund grant funded by the Korean government (the Ministry of Science and ICT, the Ministry of Trade, Industry and Energy, the Ministry of Health & Welfare, Republic of Korea, the Ministry of Food and Drug Safety; 202011A02) . The authors report no conflicts of interest.
- Language
- English
- Electronic publication date
- 06/20/2025
- Date published
- 11/19/2025
- Academic Unit
- Prosthodontics; Family Dentistry
- Record Identifier
- 9984832189402771
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