The Effects of Beverages and Surface Treatments on the Color Stability of 3D‐printed Interim Restorations

2021 ◽  
Author(s):  
Lamya Almejrad ◽  
Chao‐Chieh Yang ◽  
Dean Morton ◽  
Wei‐Shao Lin
Keyword(s):  
Color Stability ◽  
Surface Treatments ◽  
3D Printed

scholarly journals On the Effectiveness of Oxygen Plasma and Alkali Surface Treatments to Modify the Properties of Polylactic Acid Scaffolds

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1643
Author(s):  
Ricardo Donate ◽  
María Elena Alemán-Domínguez ◽  
Mario Monzón
Keyword(s):  
Surface Properties ◽  
Enzymatic Degradation ◽  
Oxygen Plasma ◽  
Physicochemical Characterization ◽  
Surface Treatments ◽  
Carboxyl Groups ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Angle Measurements ◽  
3D Printed

Surface modification of 3D-printed PLA structures is a major issue in terms of increasing the biofunctionality and expanding the tissue engineering applications of these parts. In this paper, different exposure times were used for low-pressure oxygen plasma applied to PLA 3D-printed scaffolds. Alkali surface treatments were also evaluated, aiming to compare the modifications introduced on the surface properties by each strategy. Surface-treated samples were characterized through the quantification of carboxyl groups, energy-dispersive X-ray spectroscopy, water contact angle measurements, and differential scanning calorimetry analysis. The change in the surface properties was studied over a two-week period. In addition, an enzymatic degradation analysis was carried out to evaluate the effect of the surface treatments on the degradation profile of the 3D structures. The physicochemical characterization results suggest different mechanism pathways for each type of treatment. Alkali-treated scaffolds showed a higher concentration of carboxyl groups on their surface, which enhanced the enzymatic degradation rate, but were also proven to be more aggressive towards 3D-printed structures. In contrast, the application of the plasma treatments led to an increased hydrophilicity of the PLA surface without affecting the bulk properties. However, the changes on the properties were less steady over time.

scholarly journals Color stability of a resin composite: Effect of the immersion method and surface treatments

2016 ◽  
Vol 27 (2) ◽  
pp. 195 ◽  
Author(s):  
RO Rocha ◽  
LL Miotti ◽  
GF Nicoloso ◽  
LB Durand ◽  
AH Susin
Keyword(s):  
Resin Composite ◽  
Color Stability ◽  
Surface Treatments ◽  
Immersion Method ◽  
Composite Effect

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

2021 ◽  
Vol 13 (3) ◽  
pp. 160
Author(s):  
Afnan Fouzan Alfouzan ◽  
Hadeel Minife Alotiabi ◽  
Nawaf Labban ◽  
Hanan Nejer Al-Otaibi ◽  
Sara Mohammad Al Taweel ◽  
...  
Keyword(s):  
Color Stability ◽  
3D Printed

scholarly journals Influence of Surface Finishing on Corrosion Behaviour of 3D Printed TiAlV Alloy

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1547
Author(s):  
Jaroslav Fojt ◽  
Vojtěch Hybášek ◽  
Zdeněk Kačenka ◽  
Eva Průchová
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Electrochemical Techniques ◽  
Surface Treatments ◽  
Localized Corrosion ◽  
Surface Finishing ◽  
Complex Shapes ◽  
Melting Technique ◽  
3D Printed

Additive manufacturing is currently one of the promising methods for the fabrication of products of complex shapes. It is also used in medical applications, thanks to technological progress, which also enables the printing of metallic materials. However, the final products often have to undergo a final surface treatment. In this work, the influence of surface finishing on the corrosion behavior of the medical alloy Ti-6Al-4V prepared by the selective laser melting technique is studied. The samples were subjected to mechanical, chemical and electrochemical treatments. Corrosion behavior was investigated using DC and AC electrochemical techniques such as potentiodynamic and potentiostatic curves and electrochemical impedance spectroscopy. Furthermore, the influence of surface treatments on the possibility of localized corrosion attack was evaluated. The results showed that the surface treatments have a positive effect on the corrosion resistance and reduce the risk of crevice corrosion.

scholarly journals Effects of Artificial Tooth Brushing and Hydrothermal Aging on the Mechanical Properties and Color Stability of Dental 3D Printed and CAD/CAM Materials

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6207
Author(s):  
Na-Eun Nam ◽  
Seung-Ho Shin ◽  
Jung-Hwa Lim ◽  
June-Sung Shim ◽  
Jong-Eun Kim
Keyword(s):  
Surface Roughness ◽  
Computer Aided Design ◽  
Color Stability ◽  
Color Difference ◽  
Hydrothermal Aging ◽  
Denture Teeth ◽  
Computer Aided ◽  
Cad Cam ◽  
3D Printed ◽  
Printed Materials

This study analyzed the surface roughness and waviness, Vickers hardness (VHN), and color changes of six types of 3D printed resins and computer-aided design/computer-aided manufacturing (CAD/CAM) materials after artificial toothbrushing. The average surface roughness height (Ra) change of Formlabs denture teeth A2 resin (FMLB) was not significant between after artificial toothbrushing (0.17 ± 0.02 μm and 0.17 ± 0.05 μm, respectively; mean ± standard deviation). However, the Ra value increased significantly in all remaining groups. Regarding waviness, polymethylmethacrylate (PMMA) had the largest increases in average waviness height (Wa) and maximum surface waviness height (Wz) between, before (0.43 ± 0.23 μm and 0.08 ± 0.02 μm), and after (8.67 ± 4.03 μm, 1.30 ± 0.58 μm) toothbrushing. There were no significant changes in Wa for Formlabs denture teeth A2 resin (FMLB) and NextDent C&B (NXT). After artificial toothbrushing, the dispersed-filler composite (DFC) group had the largest color difference (ΔE, of 2.4 ± 0.9), and the remaining materials had smaller changes than the clinical acceptance threshold of ΔE = 2.25. The VHN of FMLB and NXT were 9.1 ± 0.4 and 15.5 ± 0.4, respectively, and were not affected by artificial toothbrushing. The flexural strengths of the 3D printed materials were 139.4 ± 40.5 MPa and 163.9 ± 14.0 MPa for FMLB and NXT, respectively, which were similar to those of the polycarbonate and PMMA groups (155.2 ± 23.6 MPa and 108.0 ± 8.1 MPa, respectively). This study found that the evaluated 3D printed materials had mechanical and optical properties comparable to those of CAD/CAM materials and were stable even after artificial toothbrushing and hydrothermal aging.

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