scholarly journals The influence of polymerization conditions on color stability of three indirect composite materials

2013 ◽  
Vol 55 (1) ◽  
pp. 51-55 ◽  
Author(s):  
Hideyuki Imai ◽  
Hiroyasu Koizumi ◽  
Keiichi Sasaki ◽  
Hideo Matsumura
Keyword(s):  
Composite Materials ◽  
Color Stability ◽  
Indirect Composite ◽  
Polymerization Conditions

scholarly journals CURRENT STATE OF APPLIENCE ZIRCONIUM DIOXIDE IN BIOENGINEERING

2020 ◽  
Vol 4 ◽  
pp. 39-42
Author(s):  
Oksana Morozova ◽  
Edwin Gevorkyan
Keyword(s):  
Fracture Toughness ◽  
Composite Materials ◽  
Zirconium Dioxide ◽  
High Performance ◽  
Current Knowledge ◽  
High Hardness ◽  
Color Stability ◽  
Orthopedic Implants ◽  
Advantages And Disadvantages ◽  
Alternative Material

This descriptive review presents current knowledge about the bioengineering use of a zirconium dioxide, the advantages and disadvantages of the material, and the prospects for research in this direction. The work reflects the success of the practical application of the zirconium dioxide as a material for dental structures and biological implants. Such practical characteristics, such as color-stability, chemical stability, good aesthetics, biocompatibility and durability, allowed to actively use the zirconium dioxide as a material for producing various dental structures. In comparison with other ceramics, the presence of high-performance of strength and fracture toughness of the zirconium dioxide enables the use of this material as an alternative material for the reconstructions in the readings with considerable loads. High hardness determines the zirconium dioxide as an excellent material for articular prostheses, because of its hardness, provides a low level of wear and excellent biocompatibility. However, along with positive characteristics, a widespread practical problem of using the zirconium dioxide in dentistry is a chip or fracture of veneering ceramics. It has also been reported that there is a shortage of orthopedic implants such as hydrothermal stability. The solution of such problems is indicated and the use of composite materials based on the zirconium dioxide, which allows to solve a similar problem, as well as to increase the service life and reliability of orthopedic implants by providing a higher fracture toughness and mechanical strength. The existence of such composite materials based on the zirconium dioxide provides a significant increase in the wear resistance of orthopedic implants, which is essential for successful prosthetics

scholarly journals Influence of a Bleaching Agent on the Color Stability of Indirect Composite Resins Immersed in Dyes

Ceramics ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 235-245
Author(s):  
Daniele dos Santos ◽  
Emily da Silva ◽  
Juliani Mendonça ◽  
Denis Cetrangolo ◽  
Fernanda Caxias ◽  
...  
Keyword(s):  
Red Wine ◽  
Artificial Saliva ◽  
Color Stability ◽  
Composite Resins ◽  
Bleaching Agent ◽  
Initial State ◽  
Honestly Significant Difference ◽  
Significant Difference ◽  
Indirect Composite ◽  
Bleaching Action

This study aimed to evaluate the effect of a bleaching agent on the color of extrinsically pigmented indirect composite resins. Samples of five resins (Adoro, Resilab, Cristobal, Sinfony, Epricord) were manufactured and divided into five groups: red wine, coffee, orange juice, Coca-Cola, and artificial saliva (control). The stained samples were immersed in a 38% hydrogen peroxide solution for 30 min per week, over three weeks. Color readings were performed at the initial state (L0), after 21 days of dye immersion (ΔE1, L1), and after 7 (ΔE2, L2), 14 (ΔE3, L3), and 21 days (ΔE4, L4) of bleach immersion. Data were subjected to ANOVA and Tukey’s honestly significant difference (HSD) test (α = 0.05). The color alteration was greater in ΔE1, regardless of color solution, indicating extrinsic pigmentation. The Resilab group exhibited greater ΔE1 values than the other resins. The bleaching agent promoted bleaching action on the surfaces of the materials studied, removing the previously impregnated pigments.

scholarly journals Surface Texture and Optical Properties of Self-Adhering Composite Materials after Toothbrush Abrasion

2015 ◽  
Vol 16 (10) ◽  
pp. 775-782 ◽  
Author(s):  
Caroline Veiga Malavasi ◽  
Elisa Maria Macedo ◽  
Karoline da Costa Souza ◽  
Guilherme Ferreira Rego ◽  
Luis Felipe Jochims Schneider ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Composite Materials ◽  
Surface Texture ◽  
Color Stability ◽  
Organic Matrix ◽  
Degradation Process ◽  
Matrix Composition ◽  
Vertise Flow ◽  
Toothbrush Abrasion

ABSTRACT This study evaluated the surface texture and optical properties of two self-adhering composites and a nanofilled composite before and after toothbrush abrasion. Vertise Flow (Kerr), Fusio Liquid (Pentron Clinical) and Filtek Z350 XT (3M ESPE) composites were divided into 3 groups (n = 6). Disks of 12 mm diameter and 2 mm thick were made. All materials were light-cured with a LED light source for 40 seconds. Analyses of surface roughness, gloss retention and color stability were performed 24 hours after light curing and after 20,000 brushing cycles. Data were analyzed with analysis of variance (ANOVA) and Tukey's test (α = 5%). Results Tukey's test ascertained that toothbrush abrasion resulted in rougher and matte surfaces for all composites tested. Filtek Z350 presented better gloss retention after abrasion. On surface roughness evaluation, there was no statistical difference between Fusio Liquid Dentin and Filtek Z350 resins (p > 0.05). Vertise Flow resin showed better color stability (ΔE), than the other two materials. Conclusion Nanofilled material presented better gloss retention but it did not produce the best results in aspects related to surface roughness and color stability compared to self-adhering composites. Clinical significance A simulation of degradation process by using toothbrush abrasion produced a rougher and matte surface in all composites tested. The surface texture was not only related to filler's amount present in materials, but also with the organic matrix composition of them. The results suggested that the constant development of new materials, seeking for a technical simplification, seems an innovative attraction for dentist's clinical routine, even though larger studies are necessary to promote to everyone a better understanding and improvement of action and effectiveness of this new class of materials. How to cite this article Malavasi CV, Macedo EM, da Costa Souza K, Rego GF, Schneider LFJ, Cavalcante LM. Surface Texture and Optical Properties of Self-Adhering Composite Materials after Toothbrush Abrasion. J Contemp Dent Pract 2015;16(10):775-782.

Degradation Potential of Bulk Versus Incrementally Applied and Indirect Composites: Color, Microhardness, and Surface Deterioration

2016 ◽  
Vol 41 (6) ◽  
pp. e195-e208 ◽  
Author(s):  
M El Gezawi ◽  
D Kaisarly ◽  
H Al-Saleh ◽  
A ArRejaie ◽  
F Al-Harbi ◽  
...  
Keyword(s):  
Orange Juice ◽  
Repeated Measures ◽  
Vickers Microhardness ◽  
Color Stability ◽  
Ph Values ◽  
Repeated Measures Analysis ◽  
Indirect Composites ◽  
Water Ph ◽  
Indirect Composite ◽  
Post Hoc

SUMMARY This study investigated the color stability and microhardness of five composites exposed to four beverages with different pH values. Composite discs were produced (n=10); Filtek Z250 (3M ESPE) and Filtek P90 (3M ESPE) were applied in two layers (2 mm, 20 seconds), and Tetric N-Ceram Bulk Fill (TetricBF, Ivoclar Vivadent) and SonicFill (Kerr) were applied in bulk (4 mm) and then light cured (40 seconds, Ortholux-LED, 1600 mW/cm2). Indirect composite Sinfony (3M ESPE) was applied in two layers (2 mm) and cured (Visio system, 3M ESPE). The specimens were polished and tested for color stability; ΔE was calculated using spectrophotometer readings. Vickers microhardness (50 g, dwell time=45 seconds) was assessed on the top and bottom surfaces at baseline, 40 days of storage, subsequent repolishing, and 60 days of immersion in distilled water (pH=7.0), Coca-Cola (pH=2.3), orange juice (pH=3.75), or anise (pH=8.5) using scanning electron microscopy (SEM). The materials had similar ΔE values (40 days, p>0.05), but TetricBF had a significantly greater ΔE than P90 or SF (40 days). The ΔE was less for P90 and TetricBF than for Z250, SonicFill, and Sinfony (60 days). Repolishing and further immersion significantly affected the ΔE (p<0.05) except for P90. All composites had significantly different top vs bottom baseline microhardnesses. This was insignificant for the Z250/water, P90/orange juice (40 days), and Sinfony groups (40 and 60 days). Immersion produced variable time-dependent deterioration of microhardness in all groups. Multivariate repeated measures analysis of variance with post hoc Bonferroni tests were used to compare the results. ΔE and microhardness changes were significantly inversely correlated at 40 days, but this relationship was insignificant at 60 days (Pearson test). SEM showed degradation (40 days) that worsened (60 days). Bulk-fill composites differ regarding color-stability and top-to-bottom microhardness changes compared with those of other composites. P90 showed better surface degradation resistance. In conclusion, bulk-fill composites are not promising alternatives to incremental and indirect composites regarding biodegradation.

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