Influences of Light-emitting Diode Illumination Bleaching Technique on Nanohardness of Computer-aided Design and Computer-aided Manufacturing Ceramic Restorative Materials (original) (raw)
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World Journal of Dentistry
Aim: This study evaluated the influence of light emitting diode (LED) illumination bleaching technique on color stability of various computer-aided design-computer-aided manufacturing (CAD-CAM) of ceramic materials. Materials and methods: A total of 20 disk-shaped samples (width × length × thickness = 10 mm × 15 mm × 2 mm) were prepared from each of the ceramic materials for CAD-CAM including Lava™ Ultimate (L V), Vita Enamic ® (E n), IPS e.max ® CAD (M e), inCoris ® TZI (I C), and Prettau ® zirconia (P r). The samples from each type of ceramic were randomly divided into two groups based upon different bleaching techniques using 35% hydrogen peroxide with and without LED illumination. Colorimetric evaluation was determined using spectrophotometer for color differences. Results: The color difference (ΔE) upon bleaching, either without or with LED illumination [mean ± standard deviation (SD)], for each type of ceramic was 0.34 ± 0.21, 0.54 ± 0.41 for L V groups; 5.59 ± 1.35, 5.81 ± 1.45 for E n groups, 4.60 ± 1.80, 6.92 ± 1.42 for M e groups, 3.43 ± 1.04, 4.14 ± 0.72 for I C groups, and 6.61 ± 0.80, 7.03 ± 0.64 for P r groups respectively. The differences in color changes were indicated upon bleaching procedure in different degrees for the different ceramic materials. The analysis of variance (ANOVA) indicated significant differences of color change due to the effect of bleaching technique on the ceramic material (p < 0.05). Conclusion: Bleaching can affect the color stability of dental ceramics for CAD-CAM. Using 35% hydrogen peroxide bleaching agent with LED illumination caused more color alteration of dental ceramics than without LED illumination. Clinical significance: Bleaching affects color of ceramic materials. Clinicians should be careful in the protection of the existing restoration.
Evaluation of Bleaching on a CAD/CAM Hybrid Ceramic Material
Studia Universitatis Babeș-Bolyai Chemia, 2017
The objective of our study was to test the bleaching effect of two whitening gels, on stained hybrid ceramic material used for Computer Aided Design/ Computer Aided Manufacturing technology. 40 rectangular specimens 12/14/1mm were prepared form Vita Enamic blocks. All specimens were accelerated stained, and distributed in two groups. Group 1 was bleached using Opalescence PF 15% (Ultradent, USA), group 2 was bleached using an experimental gel containing natural products. ∆E* (used to asses the color changes) was above the perceptibility threshold of 1.2 in 40%; and the WID (used to asses the bleaching process in dentistry) showed high units for both bleaching gels. Hybrid ceramics staining showed moderate results, while the bleaching effect was present, with no statistical difference between the discolorations produced by the two bleaching gels (p<0.05). SEM images showed that the bleaching gels did not affect the surface structure of the material.
Dental Materials Journal
The aim of this study is to evaluate the effect of over-the-counter (OTC) at-home whitening products with LED light on partially-and fully-crystalized CAD/CAM lithium disilicate ceramics. Two partially-crystalized CAD/CAM lithium disilicate ceramics, Amber Mill and IPS e.max CAD, and one fully-crystalized CAD/CAM lithium disilicate ceramic, n!ce Straumann, were used. The specimens were divided based on treatment with OTC whitening products: no treatment provided, Colgate Optic, Crest 3D and Walgreens Deluxe. The surface roughness of the specimens was evaluated with an optical profilometer and scanning electron microscopy. The three LED whitening products significantly increased the surface roughness and changed surface morphology of Amber Mill and IPS e.max CAD but no differences for n!ce Straumann. OTC at-home whitening products with LED light can significantly increase the surface roughness of restorations fabricated with these partially-crystalized CAD/CAM lithium disilicate ceramic restorations. However, these products do not increase the surface roughness of restorations fabricated with this fully-crystalized lithium disilicate ceramic.
Applied Sciences
The purpose of this in vitro study is to compare the roughness and gloss of four resin-modified CAD/CAM ceramics after different surface treatments. Forty-eight specimens (1.20 × 12 mm2) were prepared from Lava Ultimate (LU), Vita Enamic (VE), Cerasmart (CS), and Crystal Ultra (CU) CAD/CAM ceramics. The prepared specimens were polished with silicon carbide paper before being roughened with a 30 µm grit diamond bur. Each material was allocated into four groups: control (no treatment), Luster Meisinger polishing (MP), Optiglaze (OG), or Meisinger polishing, followed by a final polishing with Shofu Direct Dia Paste (MP+PP). The roughness and gloss were measured after the surface treatment using a profilometer and gloss meter, respectively. Scanning electron microscopy micrographs were obtained to analyze the surface characteristics. Statistical analysis was performed using a multivariate analysis of variance (MANOVA), one-way ANOVA, and Dunnett’s post hoc test (α = 0.05). The surface t...
Surface Morphology Changes of Bleached Dental Ceramics
Applied Sciences
Tooth whitening is one of the most conservative procedures for increasing the aesthetics of patients, but the effect of bleaching on ceramic restorations has not been extensively studied. In this study, the bleaching effect on three dental restoration materials (polished/glazed lithium disilicate glass ceramic, leucite reinforced glass ceramic and zirconium dioxide ceramic) has been investigated in terms of surface roughness changes of the exposed samples. Philips Zoom NiteWhite 16% carbamide peroxide, Philips Zoom 6% hydrogen peroxide with following LED illumination and Pola Office 6% hydrogen peroxide have been used for ceramic bleaching. The experimental investigation and performed statistical analysis revealed that the highest surface roughness changes of all investigated ceramics were caused by the hydrogen peroxide and the lowest by carbamide peroxide. These findings correlated well with the colour changes observed in the same bleached dental ceramic samples indicating potenti...
Effects of Polishing on Color Stability and Surface Roughness of CAD-CAM Ceramics
Meandros Medical and Dental Journal
Objective: The purpose of this study is to determine the effects of polishing techniques on color stability and surface roughness of lithium disilicate glass ceramic (LDC) and zirconia-reinforced lithium silicate ceramic (ZLS). MaterialsandMethods: Two hundred forty disks of LDC and ZLS were prepared. Glazing with the ceramics' own glazing procedure, a series of sof-lex polishing discs and abrasive stones were used as the different polishing groups. Color differences (∆E*) was evaluated by spectrophotometer, initial and after 48 hours of immersion in various solutions (n=10). Surface roughness (Ra) was evaluated by profilometer (n=10). Data were analyzed by Two-Way ANOVA, and Mann-Whitney U test. Results: No significant difference in ∆E* values was observed between the sof-lex groups and abrasive stone groups (p>0.05) on LDC. ∆E* values were significantly different with glazed, and abrasive stone groups than sof-lex groups (p<0.05) on ZLS. Within the staining solutions for LDC specimens decreasing ∆E* values were observed in coffee to coke, and then tea and water. However, within the staining solutions for ZLS specimens the highest ∆E* values were observed in coffee, and then equal ∆E* values in coke and tea and the lowest ∆E* values were observed in water. Within the CAD-CAM ceramic materials ∆E* values of ZLS specimens were higher than LDC specimens (p<0.05). Both of ZLS and LDC specimens, the lowest Ra values were observed in glazing groups, which were not statistically different from each other (p>0.05). The highest Ra value in ZLS was observed in group sof-lex. No significant difference was observed among group abrasive stone and sof-lex in LDC specimens (p>0.05). Conclusion: The amount of staining in the polished ZLS samples was more than the LDC samples. The coffee was determined as the most colorant solution. Abrasive stone may be used instead of sof-lex for polishing of LDC specimens. Amaç: Bu çalışmanın amacı, polisaj tekniklerinin lityum disilikat cam seramik (LDC) ve zirkonya ile güçlendirilmiş lityum silikat seramiklerin (ZLS) renk stabilitesi ve yüzey pürüzlülüğüne etkilerini belirlemektir. Gereç ve Yöntemler: LDC ve ZLS'den 240 disk hazırlanmıştır. Farklı polisaj grupları olarak seramiklerin kendi glaze prosedürü, sof-lex polisaj diskleri ve aşındırıcı taşlar kullanılmıştır. Renk farklılıkları (∆E*), 48 saat çeşitli solüsyonlarda bekletilme öncesinde ve sonra spektrofotometre ile değerlendirilmiştir (n=10). Yüzey
Applied Sciences
This in vitro study compared the color change (∆E) and biaxial flexural strength (BFS) of two resin nanoceramics (LU and CS) and two polymer-infiltrated ceramic networks (VE and CU) after different surface finishing protocols. A total of 192 discs (12 × 1.2 mm2) were prepared from the materials (n = 48) and then polished with 1200-grit silicon carbide paper, followed by roughening with a 30 µm grit diamond bur. According to the surface finishing applied, the discs from each material category were categorized into four groups: control group (no finishing), polishing (MP), glazing (OG), or a combination of MP and additional polishing (MP+PP). Following surface finishing, all the discs were immersed in a coffee beverage to simulate one year of clinical use. A spectrophotometer and universal testing machine were used to measure the ∆E and BFS, respectively. Fractographic analysis was performed using scanning electron microscopy images. Multivariate analysis of variance was used for the ...
European Journal of Dentistry
Objective This article evaluates the effect of multipurpose polishing kit on surface roughness and hardness of three computer-aided design/computer-aided manufacturing (CAD/CAM) ceramic materials at different polishing durations. Weight changes of the polishing bur were also determined. Material and Methods Three CAD/CAM ceramic materials were lithium disilicate glass ceramic (IPS e.max CAD), translucent zirconia (VITA YZ), and zirconia-reinforced lithium disilicate ceramic (Celtra Duo). Ceramics were ground with a diamond bur, and polished with the multipurpose polishing kit (Eve Diacera HP), which comprises coarse and fine polishing burs. Surface roughness value (Ra) was measured using a noncontact optical profilometer (n = 10 per group) after grinding and every 15 seconds of coarse and fine polishing until 60 seconds. The complete polishing Ra was compared with the lab as-received specimens and human enamel. Surface morphology was examined using a scanning electron microscope aft...
Meandros Medical and Dental Journal, 2019
Anah tar Ke li me ler Seramikler, renk stabilizasyonu, bilgisayardestekli dizayn/bilgisayar-destekli üretim, hibrit seramik, nanoseramik Keywords Ceramics, color stability, computer-aided design/computer-aided manufacturing, hybrid ceramic, nanoceramic Objective: Ceramic glazing and polishing are important for patient satisfaction and long-term clinical success. Till date, no study has compared color changes after glazing procedures between conventional and more recently introduced ceramics. In this study, we investigated the effects of glazing procedures on the color stability of conventional and computer-aided design/computer-aided manufacturing (CAD/ CAM) hybrid ceramics using a spectrophotometer. Materials and Methods: Eighty-four disc-shaped specimens were fabricated with seven different dental porcelain materials according to the manufacturers' instructions (n=12 each