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Color stability of 3D-printed denture resins: effect of aging, mechanical brushing and immersion in staining medium

Authors
  • Alfouzan, Afnan Fouzan1
  • Alotiabi, Hadeel Minife1
  • Labban, Nawaf1
  • Al-Otaibi, Hanan Nejer1
  • Al Taweel, Sara Mohammad1
  • AlShehri, Huda Ahmed1
  • 1 . , (Saudi Arabia)
Type
Published Article
Journal
The Journal of Advanced Prosthodontics
Publisher
The Korean Academy of Prosthodontics (KAMJE)
Publication Date
Jun 25, 2021
Volume
13
Issue
3
Pages
160–171
Identifiers
DOI: 10.4047/jap.2021.13.3.160
PMID: 34234926
PMCID: PMC8250187
Source
PubMed Central
Keywords
Disciplines
  • Original Article
License
Unknown

Abstract

PURPOSE This in-vitro study evaluated and compared the color stability of 3D-printed and conventional heat-polymerized acrylic resins following aging, mechanical brushing, and immersion in staining medium. MATERIALS AND METHODS Forty disc-shaped specimens (10 mm in diameter and 3 mm thick) were prepared from two 3D-printed [DentaBASE (DB) and Denture 3D+ (D3D)] and one conventional polymethylmethacrylate (PMMA) denture materials. The specimens were thermo-cycled, subjected to mechanical brushing, and were immersed in either coffee, lemon juice, coke, or artificial saliva (AS) to simulate one and two years of oral use. Color measurements of the specimens were recorded by a spectrophotometer at baseline (T0), and after one (T1) and two years (T2) of simulation. The color changes (∆E) were determined and also quantified according to the National Bureau of Standards (NBS) units. Descriptive statistics, followed by factorial ANOVA and Bonferroni post-hoc test (α=.05), were applied for data analysis. RESULTS The independent factors, namely material, staining medium, and immersion time, and interaction among these factors significantly influenced ∆E ( P <.009). Irrespective of the materials, treatments, and time, the highest and the lowest mean ∆Es were observed for PMMA in lemon juice (4.58 ± 1.30) and DB in AS (0.41 ± 0.18), respectively. Regarding the material type, PMMA demonstrated the highest mean ∆E (2.31 ± 1.37), followed by D3D (1.67 ± 0.66), and DB (0.85 ± 0.52), and the difference in ∆E between the materials were statistically significant ( P <.001). All the specimens demonstrated a decreased color changes at T2 compared to T1, and this difference in mean ∆E was statistically significant ( P <.001). CONCLUSION The color changes of 3D-printed denture resins were low compared to conventional heat polymerized PMMA. All the tested materials, irrespective of the staining medium used, demonstrated a significant decrease in ∆E values over time.

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