marafi, abdullah
(2024)
The Effect of Extrinsic Staining on 3D Printed Provisional Crowns.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Objectives: The aim of this study was to evaluate the color stability of 3D printed resin disks using spectral reflectance data obtained at different time periods after immersion in staining solution.
Methods: Forty identical round disk specimens measuring 10 mm in diameter and 2 mm in thickness were fabricated using CAD/CAM 3D printing resin (shade B1). Half of the specimens (n=20) were polished using an acrylic bur and medium pumice. The other half was left unpolished (n=20). Each group of disks was then immersed in one of the following immersion solutions : artificial saliva, black tea, carrot juice, and red wine. Color difference ΔE was evaluated using a spectral reflectance instrument known as spectrophotometer at baseline, day 1, week 1, week 2 and week 3, against a white background.
Results: Color difference ΔE was measured using CIELAB formula. The mean ΔE values of each group were calculated. The greatest difference in color was observed in the unpolished and polished disks immersed in red wine. Polished disks showed less color difference when compared to unpolished disks. Significant differences in ΔE were detected between polished and non-polished disks immersed in red wine at week 1 (p = 0.0159), week 2 (p = 0.0079) and week 3 (p = 0.0079) and in carrot juice at week 3 (p = 0.0317).
Conclusion: Immersion in different staining solutions caused detectable color difference in the tested materials which was relative to the immersion duration and the staining solution used.
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The color of the 3D printing resins is influenced by the surface finishing, which may result in visually perceptible color differences. The color stability of 3D printing material should be improved to manufacture oral appliances which provide long-term esthetics.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
3 January 2024 |
| Date Type: |
Publication |
| Defense Date: |
1 November 2023 |
| Approval Date: |
3 January 2024 |
| Submission Date: |
5 December 2023 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
30 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
School of Dental Medicine > Dental Science |
| Degree: |
MDS - Master of Dental Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
3d printed resin, color stability |
| Date Deposited: |
03 Jan 2024 20:24 |
| Last Modified: |
03 Jan 2024 20:24 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/45603 |
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