Color stability of provisional restorative materials with different fabrication methods
송소연, 신요한, 이정열, 신상완,
소속 상세정보
송소연 ( Song So-Yeon ) - Korea University Graduate School Department of Biomedical Sciences
신요한 ( Shin Yo-Han ) - Korea University Graduate School Department of Medicine
이정열 ( Lee Jeong-Yol ) - Korea University Guro Hospital Department of Prosthodontics
신상완 ( Shin Sang-Wan ) - Korea University Institute for Clinical Dental Research
Abstract
PURPOSE: The aim of this study was to investigate and compare the color stability of provisional restorative materials fabricated by 3D printing, dental milling, and conventional materials.
MATERIALS AND METHODS: For the experimental groups, two commercially available 3D-printing provisional resins (E-Dent 100; EnvisionTEC GmbH, Germany & VeroGlaze™; Stratasys®, USA), two dental milling blocks (PMMA Disk; Yamahachi Dental Co., Japan & Telio®CAD; Ivoclar Vivadent AG, Liechtenstein), and two conventional materials (Alike™; GC Co., Japan & Luxatemp automix plus; DMG, Germany) were used. The water sorption and solubility test were (n=10, respectively) carried out according to ISO4049:2000 (International Standards Organization, Geneva, Switzerland). For the color stability test (n=10), coffee and black tea were used as staining solutions, and the specimens were stored for 12 weeks. Data were analyzed by one-way ANOVA and Tukey's HSD using SPSS version 22.0 (SPSS Inc. Chicago, IL, USA) (P<.05).
RESULTS: Alike and Veroglaze showed the highest values and Luxatemp showed the lowest water sorption. In the color stability test, the ΔE of conventional materials varied depending on the staining solution. PMMA milling blocks showed a relatively low ΔE up to 4 weeks, and then significantly increased after 8 weeks (P<.05). 3D-printed materials exhibited a high ΔE or a significant increase over time (P<.05).
CONCLUSION: The degree of discoloration increased with time, and a visually perceptible color difference value (ΔE) was shown regardless of the materials and solutions. PMMA milled and 3 D-printed materials showed more rapid change in discoloration after 8 weeks.
키워드
Provisional restorative materials; 3D printing dental materials; Dental PMMA milling materials; Color stability; Water sorption; Solubility; Spectrophotometer; CIELAB color space
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