Effect of ultraviolet protective agents on maxillofacial silicone elastomer, part 1: Color stability after artificial aging

2021 ◽  
Author(s):  
Bilge Turhan Bal ◽  
Merve Bankoğlu Güngör ◽  
Seçil Karakoca Nemli ◽  
Cemal Aydın ◽  
Yeliz Kaşko Arıcı
Keyword(s):  
Artificial Aging ◽  
Color Stability ◽  
Silicone Elastomer ◽  
Protective Agents

scholarly journals The Effect of Nano Zinc Oxide Particles on Color Stability of MDX4-4210 Silicone Prostheses

2020 ◽  
Vol 14 (04) ◽  
pp. 525-532
Author(s):  
Dittaya Charoenkijkajorn ◽  
Sasiwimol Sanohkan
Keyword(s):  
Zinc Oxide ◽  
Artificial Aging ◽  
Color Change ◽  
Color Stability ◽  
Silicone Elastomer ◽  
Aging Period ◽  
Nano Zinc Oxide ◽  
Oxide Particles ◽  
Zinc Oxide Particles ◽  
Nano Zinc

Abstract Objective This article aimed to study the effect of different concentrations of nano zinc oxide particles on the color change of MDX4–4210 facial silicone elastomer after artificial aging. Materials and Methods Silicone specimens (N = 150) were fabricated by incorporating intrinsic pigments and divided into three groups—white, yellow, and red, each group consisting of 50 specimens (n = 50). In each color, specimens were subdivided into five subgroups according to the quantity of zinc oxide nanoparticles (0, 0.5, 1.0, 1.5, and 2.0% weight), where the 0% weight served as the control in each group. All specimens were then subjected to artificial aging using an accelerated aging machine chamber for 12, 24, 48, and 72 hours. L*a*b* values of specimens were noted after a different aging period by a spectrophotometer and ∆E* was calculated. Statistical Analysis Two-way repeated analysis of variance (ANOVA) was done to examine the effects under test conditions (concentration and aging time) of each color group. Then color, concentration, and the aging period were subjected to three-way repeated ANOVA to investigate the effects of different colors and concentrations on ∆E*. Bonferroni’s test was performed to identify differences between groups. The significant level was at p = 0.05. Results The control group showed significantly higher ∆E* values than the test groups. The 1.5% test group showed significantly lower ∆E* compared with the others. The 0.5 to 2.0% of nano zinc oxide significantly decreased the color change of the silicone elastomer (p < 0.05), but there were no significant differences among groups. Conclusions Incorporation of 1.5% of nano zinc oxide can improve the color stability of silicone prosthesis (MDX4–4210).

Color stability of sealed composite resin restorative materials after ultraviolet artificial aging and immersion in staining solutions

2011 ◽  
Vol 105 (4) ◽  
pp. 236-241 ◽  
Author(s):  
Anderson Catelan ◽  
André Luiz Fraga Briso ◽  
Renato Hermann Sundfeld ◽  
Marcelo Coelho Goiato ◽  
Paulo Henrique dos Santos
Keyword(s):  
Artificial Aging ◽  
Composite Resin ◽  
Color Stability ◽  
Restorative Materials

scholarly journals Bleaching Agent Action on Color Stability, Surface Roughness and Microhardness of Composites Submitted to Accelerated Artificial Aging

2011 ◽  
Vol 05 (02) ◽  
pp. 143-149 ◽  
Author(s):  
Raphael Mendes Bezerra Rattacaso ◽  
Lucas de Fonseca Roberti Garcia ◽  
Fabiano Gamero Aguilar ◽  
Simonides Consani ◽  
Fernanda de Carvalho Panzeri Pires-de-Souza
Keyword(s):  
Surface Roughness ◽  
Artificial Aging ◽  
Artificial Saliva ◽  
Color Stability ◽  
Color Reading ◽  
Bleaching Agent ◽  
Significant Difference ◽  
Knoop Microhardness ◽  
Initial Color ◽  
Daily Application

ABSTRACTObjectives: The purpose of this study was to evaluate the bleaching agent action on color stability, surface roughness and microhardness of composites (Charisma, Filtek Supreme and Heliomolar - A2) submitted to accelerated artificial aging (AAA). Methods: A Teflon matrix (12 x 2 mm) was used to fabricate 18 specimens (n=6) which, after polishing (Sof-Lex), were submitted to initial color reading (ΔE), Knoop microhardness (KHN) (50 g/15 s load) and roughness (Ra) (cut-off 0.25 mm) tests. Afterwards, the samples were submitted to AAA for 384 hours and new color, microhardness and roughness readings were performed. After this, the samples were submitted to daily application (4 weeks) of 16% Carbamide Peroxide (NiteWhite ACP) for 8 hours and kept in artificial saliva for 16 hours. New color, microhardness and roughness readings were made at the end of the cycle, and 15 days after bleaching. Results: Comparison of the ΔE means (2-way ANOVA, Bonferroni, P<.05) indicated clinically unacceptable color alteration for all composites after AAA, but without significant difference. Statistically significant increase in the KHN values after AAA was observed, but without significant alterations 15 days after bleaching. For Ra there was no statistically significant difference after AAA and 15 days after bleaching. Conclusions: The alterations promoted by the bleaching agent and AAA are material dependent. (Eur J Dent 2011;5:143-149)

scholarly journals Color stability evaluation of micro hybrid composite resins submitted to accelerated artificial aging

2015 ◽  
Vol 21 (4) ◽  
pp. 227
Author(s):  
Gisseli Bertozzi Ávila ◽  
Sergio Candido Dias ◽  
Mariana Lima da Costa Valente ◽  
José Augusto Marcondes Agnelli ◽  
Andréa Candido dos Reis
Keyword(s):  
Hybrid Composite ◽  
Artificial Aging ◽  
Color Change ◽  
Dental Materials ◽  
Color Stability ◽  
Composite Resins ◽  
Color Analysis ◽  
Oral Rehabilitation ◽  
Surface Degradation ◽  
O 15

Objective: The aesthetics of dental materials is extremely important for the success of oral rehabilitation. Thus, in the present study we evaluated the color stability and the surface degradation of three micro hybrid composite resins after accelerated artificial aging process (AAA). Methods: Were prepared 24 specimens (n=8) for each material: Solidex, Artglass and Cesead, dimensions of Ø 15 mm by 2 mm in thickness. The samples were subjected to color analysis, before and after AAA, in a spectrophotometer according to the CIE L*a*b* parameters, and a sample of each material, was selected for morphological evaluation under scanning electron microscopy (SEM). The data were submitted to one-way ANOVA and Tukey test (α=0.05). Results: Artglass showed higher stability regarding the presence of red and yellow (p<0.05) when subjected to the AAA and fewer of these pigments (p<0.05) when compared to the Cesead and Solidex, which showed the highest luminance stability (p<0.05). ΔE Cesead was the most unstable (p<0.05). All resins analyzed by SEM showed superficial degradation when submitted to the AAA, mainly in resin Cesead. Conclusion: All materials analyzed demonstrate color change and surface degradation, Cesead resin showed the worse results.

scholarly journals Composites Associated with Pulp-Protection Material: Color-Stability Analysis after Accelerated Artificial Aging

2010 ◽  
Vol 04 (01) ◽  
pp. 006-011 ◽  
Author(s):  
Diogo Rodrigues Cruvinel ◽  
Lucas da Fonseca Roberti Garcia ◽  
Simonides Consani ◽  
Fernanda de Carvalho Panzeri Pires-de-Souza
Keyword(s):  
Artificial Aging ◽  
Glass Ionomer Cement ◽  
Color Stability ◽  
Color Variation ◽  
Control Group ◽  
Glass Ionomer ◽  
Before And After ◽  
Material Composite ◽  
Ionomer Cement ◽  
Material Concept

ABSTRACTObjectives: This study assessed the color stability of two composites associated with two pulp protectors submitted to accelerated artificial aging (AAA).Methods: 60 test specimens were made with 0.5 mm of protection material (calcium hydroxide - CH or glass ionomer cement - GIC) and 2.5 mm of restoration material (Concept or QuixFil) and divided into 3 groups (n=10) according to the type of protection material/composite, and the control group (no protection). After polishing, color readings were obtained with a spectrophotometer (PCB 6807 Byk Gardner) before and after AAA for 384 hours, and L*, a*, and b* coordinates and total color variation (ΔE) were analyzed (2-way ANOVA, Bonferroni, α=05).Results: Composites placed on CH presented lower L* levels than those on GIC, which presented higher L* values than the control group and lower b* values than those of the CH group. The Concept composite presented higher ΔE levels for all groups, differing statistically from QuixFil, except when placed on GIC.Conclusions: It was concluded that the protection material could affect the color stability and AAA is a factor that enhances this effect, depending on the type of composite used. (Eur J Dent 2010;4:6-11)

Sign in / Sign up

Export Citation Format

Share Document