scholarly journals PROSES PEMBUNGAAN BEBERAPA VARIETAS Hoya coronaria DARI KAWASAN HUTAN KERANGAS AIR ANYIR, BANGKA

2018 ◽  
Vol 2 (1) ◽  
pp. 10-19
Author(s):  
Risti Annisa ◽  
Yulian Fakhrurrozi ◽  
Sri Rahayu
Keyword(s):  
Flower Development ◽  
Development Process ◽  
Color Change ◽  
Flower Color ◽  
Color Changes ◽  
Light Yellow ◽  
Heath Forest ◽  
The Difference ◽  
Different Color ◽  
Flowering Process

Hoya coronaria found in heath forest of Air Anyir, Bangka has diverse colors. Flowers color diversity sometimes correlated varieties or the result of color changes during flowering process. The flowers development process observed from 5 H. coronaria varieties with different color from heath forest of Air Anyir, Bangka.The purpose of this research to know the flowering process and flower color change process some varieties of H. coronaria. This research done from September 2015-January 2016. This study used qualitative method to made detail and systematic description about flowering phase. H.coronaria flowering process consists of flower initation, flower estabilisment and flower development. Flower initation needs 13-15 days, flower estabilisment needs 10-12 days and flower development consists of early blooming process, full blooming and senescene. Early blooming process needs 1-3 days, full blooming needs 5-12 days and senescene needs 1-3 days. During the development process changes from rounded to pentagonal shape and there is a change in size. The observation result showed that 5 varieties are different from one another based on the difference between the colors of the flowers. Variety 1 has yellow corolla without honey line and deep pink corona. Variety 2 has light yellow green corolla with strong pink honey line and moderate red corona. Variety 3 has moderate red corolla with moderate red honey line and moderate red corona. Variety 4 has light yellow green corolla with moderate pink honey line and light yellow green corona. Variety 5 has moderate red without honey line and grayish red corona

scholarly journals Spectrophotometric Evaluation of Enamel Color Variation Using Infiltration Resin Treatment of White Spot Lesions at One Year Follow-Up

2020 ◽  
Vol 8 (2) ◽  
pp. 35 ◽  
Author(s):  
Roberto Lo Giudice ◽  
Frank Lipari ◽  
Francesco Puleio ◽  
Angela Alibrandi ◽  
Fabrizio Lo Giudice ◽  
...  
Keyword(s):  
Color Change ◽  
Statistical Significance ◽  
Color Variation ◽  
White Spot ◽  
White Spot Lesions ◽  
Color Changes ◽  
The Difference ◽  
One Year ◽  
The Stability

The aim of this study is to evaluate the color changes and the stability at a 1-year follow-up of white spot lesions (WSLs) treated with an infiltrating technique by using etching and TEGDMA resin. The color of 22 white spot lesions and the sound adjacent enamel (SAE) were assessed with a spectrophotometer at T0 (baseline), T1 (after treatment), and T2 (1 year after). The color change ΔE (WSLs-SAE) at T0 vs. T1 were compared to evaluate the camouflage effect efficiency, and at T1 vs. T2 to assess the stability of outcomes. To evaluate the effect on the treatment outcome of gender, the presence or not of previous orthodontic treatment, WSLs onset more/less than 10 years, the age of the patient, and the ΔE WSL (T0 vs. T1) was analyzed. The difference between ΔE (WSLs-SAE) at T0 and T1 resulted in statistical significance (p < 0.01). No statistical difference was found between ΔE (WSLs-SAE) at T1 vs. T2. The variables considered showed no statistical differences in treatment outcomes. The results of our investigation show that the technique used is immediately effective and the camouflage effect keeps up and steady one year after treatment. Such results do not appear to be influenced by analyzed clinical variables.

The Effect of Bleaching Agents on the Color Stability of Ceromer and Porcelain Restorative Materials In Vitro

2012 ◽  
Vol 38 (1) ◽  
pp. E1-E8 ◽  
Author(s):  
HB Kara ◽  
F Aykent ◽  
B Ozturk
Keyword(s):  
Color Change ◽  
Glass Ceramics ◽  
In Vitro Study ◽  
Color Stability ◽  
Color Changes ◽  
Bleaching Procedure ◽  
Significant Difference ◽  
Restorative Materials ◽  
The Difference

SUMMARY Purpose The aim of this in vitro study was to determine the color changes of five different restorative materials after exposing these materials to two different home bleaching agents. Methods This study applied bleaching agents to an ultralow-fusing porcelain, a low-fusing porcelain, two types of heat-pressed glass ceramics, and a ceromer. A total of 24 disc-shaped specimens were fabricated (with a diameter of 10 mm and a thickness of 2 mm) from each material (n=12). The initial color measurements were taken with a spectrophotometer. The first set of specimens were bleached with 10% hydrogen peroxide (HP) for one hour daily for 10 days. The other set of specimens were bleached with 10% carbamide peroxide (CP) bleaching gel for eight hours daily for 14 days. Data were analyzed with the one-way analysis of variance and Kruskal-Wallis statistical test. The difference in the prebleaching and postbleaching color of each material was considered to be statistically significant at p &lt; 0.05. Results The study found a statistically significant difference among the color changes of the test groups after exposing them to both bleaching agents (p&lt;0.05). Appreciable color change was observed in the Estenia (ΔE=3.99) specimens that were bleached with the HP, and noticeable color changes were observed in the Estenia (ΔE=1.89) and IPS Empress 2 (ΔE=1.66) groups when they were treated with the CP. Conclusions Restorations (especially polymer-containing restorative materials) should be protected before any bleaching procedure due to the high risk of color change.

scholarly journals Aggregation of Gold Nanoparticles Caused in Two Different Ways Involved in 4-Mercaptophenylboronic Acidand Hydrogen Peroxide

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1802
Author(s):  
Runmei Li ◽  
Xuefan Gu ◽  
Xingtang Liang ◽  
Shi Hou ◽  
Daodao Hu
Keyword(s):  
Hydrogen Peroxide ◽  
Boric Acid ◽  
Color Change ◽  
H2o2 Concentration ◽  
Ph Change ◽  
Detection Range ◽  
Color Changes ◽  
New Strategy ◽  
Colorimetric Assays ◽  
The Difference

The difference in gold nanoparticle (AuNPs) aggregation caused by different mixing orders of AuNPs, 4-mercaptophenylboronic acid (4-MPBA), and hydrogen peroxide (H2O2) has been scarcely reported. We have found that the color change of a ((4-MPBA + AuNPs) + H2O2) mixture caused by H2O2 is more sensitive than that of a ((4-MPBA + H2O2) + AuNPs) mixture. For the former mixture, the color changes obviously with H2O2 concentrations in the range of 0~0.025%. However, for the latter mixture, the corresponding H2O2 concentration is in the range of 0~1.93%. The mechanisms on the color change originating from the aggregation of AuNPs occurring in the two mixtures were investigated in detail. For the ((4-MPBA + H2O2) + AuNPs) mixture, free 4-MPBA is oxidized by H2O2 to form bis(4-hydroxyphenyl) disulfide (BHPD) and peroxoboric acid. However, for the ((4-MPBA+AuNPs) + H2O2) mixture, immobilized 4-MPBA is oxidized by H2O2 to form 4-hydroxythiophenol (4-HTP) and boric acid. The decrease in charge on the surface of AuNPs caused by BHPD, which has alarger steric hindrance, is poorer than that caused by -4-HTP, and this is mainly responsible for the difference in the aggregation of AuNPs in the two mixtures. The formation of boric acid and peroxoboric acid in the reaction between 4-MPBA and H2O2 can alter the pH of the medium, and the effect of the pH change on the aggregation of AuNPs should not be ignored. These findings not only offer a new strategy in colorimetric assays to expand the detection range of hydrogen peroxide concentrations but also assist in deepening the understanding of the aggregation of citrate-capped AuNPs involved in 4-MPBA and H2O2, as well as in developing other probes.

scholarly journals Tooth color change due to different etching and debonding procedures

2018 ◽  
Vol 88 (6) ◽  
pp. 779-784 ◽  
Author(s):  
Hande Gorucu–Coskuner ◽  
Ezgi Atik ◽  
Tulin Taner
Keyword(s):  
Tungsten Carbide ◽  
Orthodontic Treatment ◽  
Color Change ◽  
Wilcoxon Test ◽  
Tooth Color ◽  
Group Iii ◽  
Color Changes ◽  
Intergroup Comparison ◽  
Different Color ◽  
Self Etch

ABSTRACT Objectives: To compare the effects of different etching techniques, 12–, 24–bladed tungsten carbide burs, and polishing discs on tooth color changes during orthodontic treatment. Materials and Methods: 59 individuals (mean age: 15.20 ± 1.59 years) were divided into four groups: 37% phosphoric acid and adhesive primer was used in Groups I and II whereas self–etch primer was used in Groups III and IV for enamel preparation. After orthodontic treatment, residual adhesives were cleaned with 12–bladed tungsten carbide burs in Groups I and III, while 24–bladed tungsten carbide burs were used in Groups II and IV. All teeth were polished with medium and fine Sof–Lex XT discs (3M ESPE, St Paul, Minnesota). Color measurements were taken from upper incisors and canines at pretreatment (T0), after cleaning with tungsten carbide burs (T1) and polishing with discs (T2). Wilcoxon test was used for evaluation of L*, a*, b* changes and Kruskal–Wallis for intergroup comparison of color changes. Results: L*, a*, b* values, except a* at Groups I, II, IV, and b* at Group III, changed significantly (P &lt; .05). Groups III and IV showed significantly different color alterations from T0 to T1 (P &lt; .05). After polishing, tooth color alterations were not significantly different among the groups. Conclusions: In self–etch bonding groups, a 12–bladed tungsten carbide bur caused less color change than the 24–bladed tungsten carbide bur. Orthodontic treatment resulted with visible and clinically unacceptable tooth color alterations regardless of the enamel preparation and clean–up techniques. Polishing reduced the effect of tungsten carbide burs, but did not affect the total influence of orthodontic treatment on the tooth color.

scholarly journals Polishing can reduce discoloration of the nanofiller composite resin filling due to the use of chlorhexidine

2020 ◽  
Vol 9 (3) ◽  
pp. 252-256
Author(s):  
I Gusti Ketut Armiati
Keyword(s):  
Composite Resin ◽  
Color Change ◽  
Chlorhexidine Gluconate ◽  
Control Group ◽  
Control Group Design ◽  
Treatment Groups ◽  
Color Changes ◽  
Long Time ◽  
Cavity Design ◽  
The Difference

Nanofiller composite resin (NCR) restoration has a major problem, namely color changes. Polishing are factors that determi-ne color change and if accompanied by the use of mouthwash for a long time can cause more significant color changes. The 0.2% chlorhexidine gluconate mouthwash is a mouthwash that is often used in the community because it has low toxicity. However, using the chlorhexidine gluconate 0.2% mouthwash in the long term can cause more significant discoloration. This study is aimed to determine the difference between discoloration of polished and unpolished NCR on the soaking of 0.2% chlorhexidine gluconate mouthwash. This purely experimental research with a pretest and posttest with control group design, using 24 samples of premolar teeth prepared with class II cavity design and then filled with NCR. The samples were then di-vided into 4 treatment groups, namely polished and non-polished NCR, 0.2% chlorhexidine gluconate mouthwash and aqua-dest. Soaking was carried out 24 hours a day for 5 days in an incubator at 37ºC. Color changes of each group were measured using shade guide Vita Classical. The results were analyzed descriptively and the normality was tested by the Shapiro-Wilk and Levene's homogenity test with significance value of 0.05. Mann-Whitney for the different test. Based on the results of this study, it is concluded that the discoloration of the polished NCR was smaller than that was not polished on the soaking of chlorhexidine mouthwash 0.2%

scholarly journals Perbedaan Perubahan Warna Permukaan Resin Komposit Nanohybrid Pasca Perendaman dalam Cuko Pempek (Saus Manis dan Asam) dan Jamu Kunyit Asam (Curcuma Domestica Val – Tamarindus Indica)

2019 ◽  
Vol 16 (2) ◽  
pp. 49
Author(s):  
Budiono Budiono ◽  
Nabila Farah Khoirunnisa ◽  
Seffy Vera Faylina
Keyword(s):  
Composite Resin ◽  
Color Change ◽  
Laboratory Research ◽  
Surface Color ◽  
Color Changes ◽  
Average Change ◽  
Post Test ◽  
Experimental Laboratory ◽  
Nanohybrid Composite ◽  
The Difference

The advantages of Nanohybrid composite resin are they have a smooth surface and greater strength, also minimal shrinkage. The disadvantages of composite resin are the color changes extrinsically and intrinsically. The color is changing extrinsically because of the dyes which attached to the surface of the composite resin and the color is changing intrinsically due to oxidation of monomers. Pempek and turmeric-tamarind herbal drink (jamu) are kind of foods and beverages that are very popular among Indonesian people, both of them are causing discoloration on the surface of the composite resin. The objective was to identify the difference composite resin color change after soaking in sweet and sour sauce (cuko pempek) and turmeric-tamarind herbal drink. This study was experimental laboratory research with pre-test and post-test research design. The samples were 32 pieces of Nanohybrid composite resin with the size of 10 x 2 mm. 16 samples of each test were soaked in 5 ml “cuko pempek” and turmeric-tamarind herbal drink in 37 0 C temperature in 7 days. The color change was measured using spechtrophotometer (UV-2401 PC). Results: There are differences between Nanohybrid composite resin surface color change which were soaked in “cuko pempek” and turmeric-tamarind herbal drink which marked in an average change of dE*ab “cuko pempek” (4.7244) and turmeric and tamarind herbal drink (39.1944). The results of independent T-Test also showed a significant color change that is p = 0,000 (p <0.05). This study concluded that there were differences between Nanohybrid composite resin surface color change which are soaked in “cuko pempek” and turmeric-tamarind herbal drink.

scholarly journals Color Characteristics of Red False Heartwood and Mature Wood of Beech (Fagus sylvatica L.) Determining by Different Chromacity Coordinates

2019 ◽  
Vol 11 (3) ◽  
pp. 690 ◽  
Author(s):  
Ivan Klement ◽  
Tatiana Vilkovská
Keyword(s):  
Color Change ◽  
Free Water ◽  
Color Difference ◽  
Mature Wood ◽  
Affect Intensity ◽  
Drying Time ◽  
Color Changes ◽  
Hue Angle ◽  
Saturated Color ◽  
Different Color

Structure of wood can affect intensity of color change in remarkable ways. This article was focused on the analysis of the color changes red false heartwood and mature wood by different methods such as ΔE* (Total color difference), h* (Hue angle), C*ab (Color saturation) and Sab (Saturation). The aim of this study was to evaluate the color properties of red false heartwood and mature wood by using different chromacity coordinates. Our observations suggested that the density in the absolute dry state was equal between the red false heartwood and mature wood. The biggest difference was in the area of the free water domain, thus from an initial MC value to the fiber saturation point (FSP). The shorter drying time of the red false heartwood samples was caused by their lower initial MC. Due to the different MC, the temperature created a different color intensity of the compared samples. Mature wood samples achieved more saturated color in the drying process than did the samples of red false heartwood.

Efficacy of Silver Nanoparticles Synthesized from Hymenocallis species (Spider Lilly) Leaf Extract as Antimicrobial Agents

2019 ◽  
Vol 12 (5) ◽  
pp. 4644-4647
Author(s):  
K.K. Gupta ◽  
Neha Kumari ◽  
Neha Sinha ◽  
Akruti Gupta
Keyword(s):  
Silver Nanoparticles ◽  
Leaf Extract ◽  
Antimicrobial Agents ◽  
Color Change ◽  
Bacterial Species ◽  
Antimicrobial Property ◽  
Biogenic Synthesis ◽  
E Coli ◽  
Light Yellow ◽  
Antibiotic Property

Biogenic synthesis of silver nanoparticles synthesized from Hymenocallis species (Spider Lilly) leaf extract was subjected for investigation of its antimicrobial property against four bacterial species (E. coli, Salmonella sp., Streptococcus sp. & Staphylococcus sp.). The results revealed that synthesized nanoparticles solution very much justify the color change property from initial light yellow to final reddish brown during the synthesis producing a characteristics absorption peak in the range of 434-466 nm. As antimicrobial agents, their efficacy was evaluated by analysis of variance in between the species and among the different concentration of AgNPs solution, which clearly showed that there was significant variation in the antibiotic property between the four different concentrations of AgNPs solution and also among four different species of bacteria taken under studies. However, silver nanoparticles solution of 1: 9 and 1:4 were proved comparatively more efficient as antimicrobial agents against four species of bacteria.

scholarly journals Investigation of the selective color-changing mechanism of Dynastes tityus beetle (Coleoptera: Scarabaeidae)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiyu Sun ◽  
Wei Wu ◽  
Limei Tian ◽  
Wei Li ◽  
Fang Zhang ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Color Change ◽  
Incidence Angle ◽  
Ion Beam ◽  
Three Dimensional ◽  
Water Infiltration ◽  
Photonic Materials ◽  
Local Color ◽  
Water Contact ◽  
Color Changes

AbstractNot only does the Dynastes tityus beetle display a reversible color change controlled by differences in humidity, but also, the elytron scale can change color from yellow-green to deep-brown in specified shapes. The results obtained by focused ion beam-scanning electron microscopy (FIB-SEM), show that the epicuticle (EPI) is a permeable layer, and the exocuticle (EXO) is a three-dimensional photonic crystal. To investigate the mechanism of the reversible color change, experiments were conducted to determine the water contact angle, surface chemical composition, and optical reflectance, and the reflective spectrum was simulated. The water on the surface began to permeate into the elytron via the surface elemental composition and channels in the EPI. A structural unit (SU) in the EXO allows local color changes in varied shapes. The reflectance of both yellow-green and deep-brown elytra increases as the incidence angle increases from 0° to 60°. The microstructure and changes in the refractive index are the main factors that influence the process of reversible color change. According to the simulation, the lower reflectance causing the color change to deep-brown results from water infiltration, which increases light absorption. Meanwhile, the waxy layer has no effect on the reflection of light. This study lays the foundation to manufacture engineered photonic materials that undergo controllable changes in iridescent color.

scholarly journals Effect of Citric Acid on Color Changes of Calcium Silicate-Based Cements an In Vitro Study

2021 ◽  
Vol 11 (5) ◽  
pp. 2339
Author(s):  
Joanna Metlerska ◽  
Till Dammaschke ◽  
Mariusz Lipski ◽  
Irini Fagogeni ◽  
Anna Machoy-Mokrzyńska ◽  
...  
Keyword(s):  
Citric Acid ◽  
Calcium Silicate ◽  
In Vitro Study ◽  
Vitro Study ◽  
Color Measurement ◽  
Color Changes ◽  
Naked Eye ◽  
Root Canal Irrigants ◽  
The Difference

The aim of the present in vitro study was to investigate the effects of 10% and 40% citric acid (CA) on the color of calcium silicate–based cements (CSCs) in comparison to the effects of common root canal irrigants. Samples of six CSCs (n = 6)—ProRoot MTA (Dentsply, Tulsa, OK, USA), Biodentine (Septodont, Saint-Maur-des-Fossés, France), MTA Plus (Avalon Biomed Inc, by Prevest Denpro Limited, Jammu, India), MTA Repair HP (Angelus, Londrina, PR, Brazil), Ortho MTA (BioMTA, Seoul, Korea), and Retro MTA (BioMTA, Seoul, Korea)—were immersed in 10% and 40% CA as well as 15% EDTA, 2% NaOCl, 2% CHX, and 0.9% NaCl for 15 min, 1 h, and 24 h. ΔE values, representing the difference between the final and baseline values of the color components, were then determined using a VITA Easyshade Compact 5.0 spectrophotometer. Naked-eye evaluation of the changes in color and structures of the materials was performed using our own scale. Upon immersion of the materials in both 10% and 40% CA, there were statistically significant differences between spectrophotometric color measurement results for all CSCs (P < 0.05). However, CA does not cause dark discoloration, observable with the naked eye, of any of the materials, such as NaOCl and CHX. Significant statistical differences were also found between all CSCs in terms of submersion duration (P < 0.05). CA, which could be an alternative to EDTA use, caused greater CSCs discoloration and changed some of their structures. Unless required by the therapeutic procedure, clinicians should pay attention to the fact that the irrigant may affect the CSCs discoloration and minimize the contact time of irrigant with CSCs.

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