scholarly journals Color Stability and Micro-Hardness of Bulk-Fill Composite Materials after Exposure to Common Beverages

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 787 ◽  
Author(s):  
Nora Bahbishi ◽  
Waad Mzain ◽  
Bayan Badeeb ◽  
Hani M. Nassar
Keyword(s):  
Composite Materials ◽  
Mixed Model ◽  
Vickers Microhardness ◽  
Color Stability ◽  
Repeated Measure ◽  
Water Control ◽  
Steel Mold ◽  
Significance Level ◽  
Significant Difference ◽  
Other Regarding

Objectives: To assess the color stability and surface microhardness of Bulk-Fill composite materials available in the Saudi Arabia market. Methods: Five composite materials (Filtek Z350, Filtek Bulk-Fill, Tetric N-Ceram Bulk-Fill, Sonic Fill 2, and SDR) were investigated. Samples (n = 20; 10 mm in diameter and 2 mm in thickness) were fabricated using a stainless-steel mold and were immersed in tea, coffee, berry juice, and distilled water (control). Baseline (T0) shades of specimens were recorded using a spectrophotometer and after 10 (T1), 30 (T2), 60 (T3), and 90 days (T4) of immersion. Measurements were obtained against a black background and CIE L*a*b* data was used to calculate ΔE for each group. Vickers microhardness values were obtained at T0 and T4. Data was analyzed using mixed model repeated measure ANOVA at 0.05 significance level. Results: Time, material, and solution effects have statistically significant effect on ΔE. Tea was the most staining solution. Z350 was associated with the highest ΔE values while SDR showed the lowest values. No other materials showed significant difference between each other. Solutions were statistically different from each other. All materials were different from each other regarding microhardness. Conclusion: Bulk-Fill materials showed more color stability but lower microhardness values compared to universal resin control.

scholarly journals Effect of finishing and polishing on color stability of a nanofilled resin immersed in different media

2014 ◽  
Vol 43 (5) ◽  
pp. 338-342
Author(s):  
Ana Luísa Botta Martins de OLIVEIRA ◽  
Camila Cruz LORENZETTI ◽  
Patrícia Petromilli Nordi Sasso GARCIA ◽  
Elisa Maria Aparecida GIRO
Keyword(s):  
Stainless Steel ◽  
Composite Resin ◽  
Resin Composite ◽  
Artificial Saliva ◽  
Color Stability ◽  
Steel Mold ◽  
Significance Level ◽  
Significant Difference ◽  
Cielab System ◽  
Polishing Procedures

OBJECTIVE: The purpose of this study was to evaluate the effect of finishing and polishing on color stability of a nanofilled composite resin (Filtek Z350 XT) according to different immersion media.MATERIAL AND METHOD: Composite disks (10 mm diameter, 2 mm thickness) were prepared for each group (n = 6) using a stainless steel mold. The groups were divided according to the presence or absence of finishing and polishing procedure and immersion media (artificial saliva, artificial juice- KAPO(r) Coca-Cola(r)flavors: pineapple, orange, strawberry and grape). The finishing and polishing procedures were performed using Super -Snap(r) disks. The specimens were stored in artificial saliva for 24 hours (baseline) and were analyzed using a color spectrophotometer by CIELab system. Then, they were immersed in different media for 5 minutes, 3 times a day, every 4 hours during 60 days. They were stored in artificial saliva at 37 ± 1°C during the immersion intervals. After this time, new measure of color was performed. The data were analyzed using Kruskall-Wallis test and Mann- Whitney test. The significance level was 5%.RESULT: The results showed that the finishing/polishing not significantly influence the color stability of resin composite (p > 0.05). There was no statistically significant difference in the color stability of the studied resin after immersion in different media (p > 0.05).CONCLUSION: The finishing and polishing procedures and the immersion media did not have influence on color stability of nanofilled resin Filtek Z350 XT.

Appetite-stimulating effect of gabapentin vs mirtazapine in healthy cats post-ovariectomy

2020 ◽  
Vol 22 (12) ◽  
pp. 1176-1183
Author(s):  
Marco Fantinati ◽  
Julien Trnka ◽  
Amélia Signor ◽  
Séverine Dumond ◽  
Géraldine Jourdan ◽  
...  
Keyword(s):  
Placebo Group ◽  
Food Intake ◽  
Mixed Model ◽  
Linear Mixed Model ◽  
Repeated Measure ◽  
Mixed Model Analysis ◽  
Treatment Groups ◽  
Significant Difference ◽  
Post Hoc ◽  
Difference Test

Objectives The aim of the study was to evaluate the appetite-stimulating effect of gabapentin by comparing it with mirtazapine in healthy cats in the first 8 h after ovariectomy surgery. Methods This double-masked, placebo-controlled, prospective clinical trial included 60 healthy cats presented to the hospital for ovariectomy: 20 received gabapentin, 21 received mirtazapine and 19 received a placebo immediately before and 6 h after surgery. Food was offered at 2, 4, 6 and 8 h post-ovariectomy. After each meal, food intake was measured. Data were analysed using repeated-measure ANOVA and a linear mixed-model analysis. Post-hoc Tukey’s honest significant difference test was performed for multiple comparisons. Results Food intake increased in both treatment groups vs placebo. No statistically significant difference was found between cats treated with gabapentin or mirtazapine. Conclusions and relevance Cats receiving gabapentin ate more than cats in the placebo group. Thirty percent of cats in the gabapentin group covered their resting energy requirements, while none of the cats in the placebo group did. Gabapentin and mirtazapine produced similar effects on food intake.

scholarly journals In Vitro Evaluation of Physical and Mechanical Properties of Light-Curing Resin Cement: A Comparative Study

2020 ◽  
Vol 14 (01) ◽  
pp. 152-156
Author(s):  
Luís Felipe Espíndola-Castro ◽  
Oscar Felipe Fonseca de Brito ◽  
Larissa Gabrielle Assis Araújo ◽  
Izabella Luiza Aragão Santos ◽  
Gabriela Queiroz De Melo Monteiro
Keyword(s):  
Color Change ◽  
Surface Hardness ◽  
Color Stability ◽  
Resin Cement ◽  
The Other ◽  
Distilled Water ◽  
Water Control ◽  
Mean Values ◽  
Significance Level

Abstract Objective The aim of study was to evaluate in vitro the surface hardness, sorption, solubility, and color stability of three light-cured resin cements, namely RelyX Veneer (RLX), Variolink Veneer (VLK), and All Cem Veneer (ACV). Materials and Methods Cylindrical samples (15 × 1 mm) were made for each group using a metallic mold (n = 10). Vickers microhardness test was performed, and average hardness was calculated from three indentations (300 gf/15s) per sample. The sorption and solubility of the materials were evaluated according to ISO 4049:2009 based on three samples weighing: initial (m 1), after immersion in distilled water for 7 days (m 2), and final (after removal of all moisture [m 3]). The color change was observed using a digital spectrophotometer, at three different time points, baseline, 1 day, and 1 week of immersion in coffee and distilled water (control). Statistical Analysis Shapiro–Wilk test was used to analyze the normality of the data, and groups were compared using Kruskal–Wallis and Mann–Whitney tests. A significance level of 5% was used. Results RLX showed the highest microhardness mean values (36.96 VHN), but higher sorption (23.2 µg/mm3) and solubility (2.40 µg/mm3), with statistically significant differences with the other groups. For color stability, higher ∆E was observed for the samples immersed in coffee (p = 0.009). The VLK resin cement presented statistically significant differences from the other groups, with higher color changes in coffee at 1 day (15.14) and after 1 week (23.65). Conclusion RLX resin cement showed better hardness results. All materials tested performed satisfactorily for sorption and solubility according to ISO 4049:2009. All materials showed high-staining values after 1 week of immersion in coffee.

scholarly journals Influence of Photoinitiator on Accelerated Artificial Aging and Bond Strength of Experimental Resin Cements

2018 ◽  
Vol 29 (1) ◽  
pp. 82-87
Author(s):  
Helouise Righi ◽  
Ana Rosa Costa ◽  
Dayane Carvalho Ramos Salles de Oliveira ◽  
Gabriel Flores Abuna ◽  
Mario Alexandre Coelho Sinhoreti ◽  
...  
Keyword(s):  
Bond Strength ◽  
Color Stability ◽  
Test Results ◽  
Color Analysis ◽  
Color Test ◽  
Resin Cements ◽  
Significance Level ◽  
Significant Difference ◽  
System Data

Abstract The goal of this study was to evaluate in vitro the effect of the photoinitiator phenylpropanedione (PPD), alone or combined with camphorquinone (CQ), on color stability of photoactivated resin cements and their bond strength to ceramics using a micro-shear test. Four resin cements were used: a commercial brand cement (RelyX Veneer®) and 3 experimental cements with different types and concentration of photoinitiators. For color analysis, ceramic discs were cemented on bovine dentin specimens to simulate indirect restorations (n=8) and were exposed to UV for 120 h and tested for color alteration using a reflectance spectrophotometer and the CIEL*a*b* system. Data were analyzed by Anova and Tukey’s test at 5% significance level. The color test results did not present statistically significant difference for the ∆E for all the studied cements, neither for ∆L, ∆a and ∆b. For the bond strength, all the studied cements showed statistically significant differences to each other, with the highest result for the RelyX Veneer® (29.07 MPa) cement, followed by the cement with CQ (21.74 MPa) and CQ+PPD (19.09 MPa) cement; the lowest result was obtained by the cement using only PPD as a photoinitiator (13.99 MPa). So, based on the studied parameters, PPD was not advantageous as photoinitiator of resin cements, because it showed a low value of bond strength to the ceramics and no superior color stability.

scholarly journals Effect of Natural and Industrial Juices on Surface Microhardness of Microhybrid and Nanohybrid Composites

2021 ◽  
Vol 28 (2) ◽  
Author(s):  
Razieh Meshki ◽  
◽  
Hanieh Hoseini ◽  
Keyword(s):  
Mechanical Properties ◽  
Orange Juice ◽  
Immersion Time ◽  
Pomegranate Juice ◽  
Repeated Measure ◽  
Control Group ◽  
Distilled Water ◽  
Surface Microhardness ◽  
Water Control ◽  
Significant Difference

Numerous studies have been conducted on the effect of various beverages on the mechanical properties of toothcolored materials, however, little is known about the effects of these materials on composites, particularly newer types such as nanocomposites. Objectives: This study aimed to evaluate the surface microhardness of two types of composites, micro-hybrid (point 4) and nanohybrid (premise), after exposure to natural and industrial juices. Methods: In this experimental study, 90 disc-shaped specimens with a thickness of 2 mm and a diameter of 10 mm were taken from two composites, micro-hybrid Point4 (Kerr) and nanohybrid premise (kerr) (two groups of 45). Then, the specimens of each group were divided into 5 subgroups of 9 and were immersed for 7 days for 6 hours in 5 solutions of industrial orange juice, natural orange juice, industrial pomegranate juice, natural pomegranate juice, and distilled water (control group). Surface microhardness of specimens was measured by Vickers device at baseline, one day and one week after immersing. Data was measured by ANOVA, repeated measure test, and independent t-test. A significant level of α was 0.05. Results: The surface microhardness of two types of composites exposed to beverages was reduced significantly. However, no significant difference was found between natural and industrial juices in none of the composites. Conclusions: Natural and industrial juices can affect the surface microhardness of composites, which varies depending on the type of composite and the type of juice and immersion time.

scholarly journals Sensitivity of composite materials to ambient light and clinical working time

2012 ◽  
Vol 59 (4) ◽  
pp. 190-197
Author(s):  
Vesna Miletic ◽  
Tatjana Savic-Stankovic ◽  
Jovana Stasic
Keyword(s):  
Composite Materials ◽  
Hybrid Composites ◽  
Working Time ◽  
Lower Sensitivity ◽  
Ambient Light ◽  
Mean Values ◽  
Significance Level ◽  
Significant Difference ◽  
Before And After ◽  
The Difference

Introduction. The aim of this study was to determine sensitivity of composite materials to ambient light by a modified standard ISO 4049:2000 and clinical working time. Materials and Methods. The following materials were tested: nano-hybrid Herculite XRV Ultra (Kerr), micro-hybrid Herculite XRV (Kerr), Zmack (Zhermack), SuperCor (SpofaDental) and Valux Plus (3M ESPE). Five samples in each group were exposed to ambient light of 8000 lx, which comprised dental unit light and natural light. After 60 sec of exposure, each sample was visually examined for signs of inhomogeneity meaning that material did not pass the test. Clinical working time was studied by applying a custom-built, standardized indenter into composite specimens of about 2 mm thickness during the same exposure to ambient light. Completion of polymerization was tested by dissolving samples in ethanol and measuring the difference in thickness before and after the test. Results were statistically analyzed using ANOVA at the significance level of 0.05. Results. Only Herculite XRV Ultra passed the test of sensitivity to ambient light, while other materials showed signs of inhomogeneity. Herculite XRV Ultra showed significantly longer working time than other composites, the average was 250 sec (p<0.05). The mean values of working time for other materials ranged between 117-131 sec and there was no significant difference between them (p>0.05). Conclusion. Due to the lower sensitivity to ambient light and significantly longer clinical working time compared to micro-hybrid composites, Herculite XRV Ultra can be recommended for clinical procedures that require prolonged working time with material in plastic condition.

scholarly journals TiO2-Nanofillers Effects on Some Properties of Highly- Impact Resin Using Different Processing Techniques

2018 ◽  
Vol 12 (1) ◽  
pp. 202-212 ◽  
Author(s):  
Hawraa Khalid Aziz
Keyword(s):  
Thermal Conductivity ◽  
Impact Strength ◽  
Color Stability ◽  
Acrylic Resin ◽  
Water Bath ◽  
Control Group ◽  
Significance Level ◽  
Significant Difference ◽  
And Control ◽  
The Impact

Background: The criteria of conventional curing of polymethyl methacrylate do not match the standard properties of the denture base materials. Objectives: This research was conducted to investigate the addition of TiO2 nano practical on impact strength, thermal conductivity and color stability of acrylic resin cured by microwave in comparison to the conventional cured of heat-polymerized acrylic resin. Materials and Methods: 120 specimens made of high impact acrylic resin were divided into two main groups according to the type of curing (water bath, microwave), then each group was subdivided into two groups according to the addition of 3% TiO2 nano-fillers and control group (without the addition of TiO2 0%). Each group was subdivided according to the type of test into 3 groups with 10 specimens for each group. Data were statistically analyzed using Student t-test to detect the significant differences between tested and control groups at significance level (P<0.05). Results: According to curing type methods, the results showed that there was a significant decrease in impact strength of microwaved cured resin, but there was no significant difference in the thermal conductivity and color stability of resin. In addition, by using nanofiller, there was a significant increase in the impact strength and color stability with the addition of 3% TiO2 nanofillers, but no significant difference was found in the thermal conductivity of the acrylic resin. Conclusion: The microwave curing of acrylic resin had no change in the color stability and thermal conductivity in comparison to the water bath, but the impact strength was decreased. The addition of 3% TiO2 improved the impact and the color stability, but the thermal conductivity did not change.

scholarly journals Color Shift, Color Stability, and Post-Polishing Surface Roughness of Esthetic Resin Composites

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1376
Author(s):  
Yara Khalid Alkhadim ◽  
Malak Jameel Hulbah ◽  
Hani Mohammad Nassar
Keyword(s):  
Surface Roughness ◽  
Color Stability ◽  
Distilled Water ◽  
Significance Level ◽  
Color Changes ◽  
Significant Difference ◽  
Color Shift ◽  
Optical Profilometer ◽  
System Data ◽  
Multiple Comparison Methods

The aim of this study was to compare color shift, color stability, and post-polishing surface roughness of esthetic restorative materials. Twenty-five disc-shaped specimens (10 mm in diameter and 2 mm in thickness) from five esthetic resin materials (Z250XT, IPS Empress-Direct, G-ænial, Vit-l-escence, and Ceram.X) were fabricated. Color shift before and immediately after light-curing (∆E0) then color stability after immersion in tea, coffee, berry juice, and distilled water were measured using a spectrophotometer. Color changes were measured after 2 (ΔE2), 4 (ΔE4), 6 (ΔE6), and 8 weeks (ΔE8). Surface roughness values (Rq) were determined using an optical profilometer after polishing using a rotary polishing system. Data were analyzed using ANOVA and multiple comparison methods at 0.05 significance level. There were no significant differences between the tested materials regarding color shift except between Vit-l-escence and Ceram.X (p = 0.033). There was no significant difference between coffee and tea solutions (p = 1.0) and between berry juice and distilled water (p = 0.15). There was no difference between the tested materials regarding Rq (p = 0.057). Ceram.X was associated with the lowest ΔE8 values overall. Tested materials were comparable regarding color shift and post-polishing surface roughness. Susceptibility to staining was dependent on the material.

scholarly journals Analisis Pengaruh Pelatihan Self-Leadership dan Motivasi Berprestasi terhadap Kinerja Kepala Desa di Kabupaten Gunung Kidul Yogyakarta

2017 ◽  
Vol 7 (1) ◽  
pp. 94
Author(s):  
Muhamad Ali Sukrajap ◽  
Dewi Handayani Harahap
Keyword(s):  
Rural Area ◽  
Achievement Motivation ◽  
Repeated Measure ◽  
Significance Level ◽  
Significant Difference ◽  
The Status ◽  
Post Test ◽  
Village Government ◽  
The Village

<p><span class="fontstyle0">Ministry of Rural Regulation No. 6 Year 2014 about rural area said that the rural area has grown so it needs to be protected and empowered to be strong, advanced, independent, and democratic area, so as to create a strong foundation to implement governance and development towards a fair, affluent, and prosperous society. In fact, the equitable distribution of infrastructure and suprastructure is not evenly distributed in each village. </span>This can be seen from the Rural Developing Index (IDM) stating the status of rural area development progress. Based on the IDM of Indonesia in 2015, that 45.57% (33,592 villages) were underdeveloped villages and 18.25% (13,453 villages) were very under-developed villages out of a total of 73,709 villages in Indonesia. The Village Head's job is to lead the administration of the Village Government. This study aims to determine the effect of Self-Leadership and Achievement Motivation Training on the Performance of Village Head in Gunung Kidul Regency of Yogyakarta Province. Based on the result of hypothesis testing by using Anova Repeated Measure, where the result shows that F = 11186,541 with significance level 0,000 (p &lt;0,01), it proves that there is a very significant difference between pre-test, post-test, and follow-up.</p>

scholarly journals Evaluation of liquid sorption and color stability of dental composites after exposure to common lactation teas

2021 ◽  
Vol 11 (Suppl. 1) ◽  
pp. 228-233
Author(s):  
Zuhal Yıldırım Bilmez ◽  
Oya Şeker ◽  
Hazal Deniz Köse ◽  
Başak Gözüyeşil Aslan
Keyword(s):  
Composite Materials ◽  
Artificial Saliva ◽  
Color Stability ◽  
Mean Value ◽  
In Vivo Studies ◽  
Dental Composites ◽  
Primary Tooth ◽  
Significance Level

Aim: To assess the effects of common lactation teas on liquid sorption and color stability of three different dental composites. Methodology: A total of 60 samples (n = 5) were examined from three composite materials: Omnichroma (Tokuyama Dental Co., Tokyo, Japan), Estelite Posterior, (Tokuyama Dental Co., Tokyo, Japan), and Mosaic Universal (Ultradent production Inc., South Jordan, UT, USA). Samples measuring 2x6 mm were taken and immersed in three different teas—Humana (Humana, Bremen, Germany), Hipp, (Hipp, Pfaffenhofen, Germany), and Lactamil (Nutricia, Friedrichsdorf, Germany) —as well as artificial saliva. The measurements were recorded at baseline and on the 7th day. A sensitive analytical balance was used to measure liquid sorption, and a VITA Easy Shade device was used for color measurements. Absorption and Delta E values ​​were calculated. The data were analyzed using MANOVA at a significance level of (p<0.05). Results: Composite materials, solutions, and their interactions had a statistically significant effect on the sorption and Delta E values (p<0.001). The relative liquid absorption values among the composites were recorded as follows: Tokuyama>Mosaic>Omnichroma. Humana had the highest and Hipp had the lowest mean value among the solutions (p<0.001). For Delta E, Mosaic had the highest mean value among the composites, and Lactamil had the highest mean value among the solutions (p<0.001). Conclusion: Lactation teas cause discoloration in dental composites. In vitro and in vivo studies on color changes in dental composites are needed due to the sorption of these fluids.   How to cite this article: Özüdoğru S, Tosun G. Survival and clinical evaluation of various space maintainers used for early primary tooth loss. Int Dent Res 2021;11(Suppl.1):222-7. https://doi.org/10.5577/intdentres.2021.vol11.suppl1.32     Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

Sign in / Sign up

Export Citation Format

Share Document