Evaluation of Color Stability and Surface Roughness of 3D Printed Denture Base Resin Lee, Jin-Gyu Department of Dental Laboratory Science Graduate School, Catholic University of Pusan Advisor : Professor Jeon, Byung-Uk Ph.D. The aim of the current stu...
Evaluation of Color Stability and Surface Roughness of 3D Printed Denture Base Resin Lee, Jin-Gyu Department of Dental Laboratory Science Graduate School, Catholic University of Pusan Advisor : Professor Jeon, Byung-Uk Ph.D. The aim of the current study was to evaluate the color stability of 3D printed and conventional denture base resins after immersion in different staining solutions. A total of 200specimens were manufactured from two types of materials: 3D printed dental resin ZMD-1000B (ZENITH, DENTIS, Korea) and heat-polymerized PMMA Triflex hot (Ivoclar vivadent, Liechtenstein), which were immersed in five types of colorants – distrilled water, coffee, red wine ,orange juice and coke (n = 25). For measuring the color changes (CIE-L*a*b* system) of all specimens after storage in artificial saliva for 24h at 37 degrees C (T0), a spectrophotometer (CM-3600A, KONICA MINOLTA, JAPAN) was used. After one days (T1), sevendays (T2) and 30 days (T3), the mean ∆E values were calculated and compared by Bonferonni post-hoc test. The data were processed using thestatistical software SPSS 26. The level of significance forrejecting the null hypothesis was fixed at p<0.05. The values for ∆E were investigated, and the interactions between the type of material,the immersion time and the different staining solutions were statistically significant. The highest mean for ∆E was evaluated for both types of dental resin in red wine. Respectively, 3D printed specimens in artificial saliva were with the lowest mean. The 3D printed denture base resin demonstrated better color stability than the conventional acrylic materials. The staining effect correlated with the immersion time, with the red wine and coke being with the most chromogenic impact and the period with the highest color changes being 21 days.There was a significant interaction between theselected time periods and the type of staining agent, as both types of dental materials showedchanges in color stability at 1 day compared to 30 days. Key words : Dental 3d printing, Denture base resin