scholarly journals Colour Stability of Veneering Composites after Accelerated Aging

2010 ◽  
Vol 04 (02) ◽  
pp. 137-142 ◽  
Author(s):  
Triantafillos Papadopoulos ◽  
Aspasia Sarafianou ◽  
Andreas Hatzikyriakos
Keyword(s):  
Colour Change ◽  
Accelerated Aging ◽  
Blue Shift ◽  
Colour Stability ◽  
Before And After ◽  
Indirect Composites ◽  
Colour Changes ◽  
Indirect Composite ◽  
The Mean ◽  
One Way Anova

Objectives: To investigate the colour stability of four indirect composite restorative materials after accelerated aging.Methods: Four indirect composites (Gradia, Signum+, HFO and Adoro) were used. For each material, six specimens were prepared and subjected to accelerated aging (Suntest CPS+, Atlas, Chicago, IL, USA) according to ISO 7491. A Dr. Lange Microcolor Data Station colorimeter (Braive Instruments, Liege, Belgium) was used to measure specimen colour before and after aging. Measurements were performed according to the CIE L*a*b* system, and the mean L*, a* and b* values for each material were calculated. The equation ΔΕ = [(ΔL*)2 + (Δa*)2 + (Δb*)2]1/2 was used to measure the total colour change (ΔΕ), where ΔL*, Δa* and Δb* are the differences in the respective values before and after aging. One-way ANOVA were used to determine statistically significant differences in ΔL*, Δa*, Δb* and ΔΕ.Results: No statistically significant differences were found in ΔL*, Δa*, Δb* and ΔΕ among the materials tested (PΔL*=.063; PΔa*=.521; PΔb*=.984 and PΔE=.408). After aging, Gradia specimens showed an increase in lightness (ΔL*=0.36) and a green-yellow shift (Δa*=-1.18, Δb*=0.6), while Signum+ specimens exhibited an increase in lightness (ΔL*=0.5) and a green-blue shift (Δa*=-0.9, Δb*=- 0.45). HFO specimens exhibited an increase in lightness (ΔL*=0.75) and a green-yellow shift (Δa*=- 1.3, Δb*=0.06), and Adoro specimens exhibited an increase in lightness (ΔL*=2.07) and a green-yellow shift (Δa*=-1.3, Δb*=0.68).Conclusions: Colour changes were found to be within accepted values of perceptibility and clinical acceptance after accelerated aging, and no statistically significant differences were found in ΔL*, Δa*, Δb* and ΔΕ among the materials tested. (Eur J Dent 2010;4:137-142)

Colour Stability of Self-Adhesive Flowable Composites before and after Storage in Water

2014 ◽  
Vol 631 ◽  
pp. 143-150 ◽  
Author(s):  
María Arregui ◽  
Luís Giner ◽  
Marco Ferrari ◽  
Montserrat Mercadé
Keyword(s):  
High Temperature ◽  
Statistical Analysis ◽  
Colour Change ◽  
Resin Matrix ◽  
Colour Stability ◽  
Fisher Test ◽  
Before And After ◽  
Flowable Composites ◽  
Vertise Flow ◽  
One Way Anova

Objectives:The aim of this study was to compare colour stability of two self-adhesive flowable composites with four methacrylate-based composites (three flowable composites and one universal resin-based composite) after immersion in water at 60°C for 30 days.Methods:The study was conducted using the following five shade A2 flowable composites (n=30): one microhybrid (G-aenial Universal Flo), one universal (X-Flow), one nanohybrid (Premise flowable) and two self-adhesive (Vertise Flow and experimental GF-10) and one microhybrid universal resin-based composite (G-aenial Posterior). A spectrophotometer (CIEL*a*b* system) was used to measure colour stability before and after immersion. Statistical analysis was performed with one-way ANOVA and Fisher test.Results:Samples immersed in water at 60°C for one month showed a significant colour change in all groups (p<.001) that was visually perceptible (∆E>3.3). Experimental self-adhesive flowable (12.25±0.84) and X-Flow (11.56±3.26) composites showed higher levels of ∆E, while Premise flowable showed a lower level of colour change (3.47±1.26). These results approximated clinically acceptable colour change values (∆E≤3.3). Water ageing at 60°C produced a significant change in colour in all the composites. The high temperature may explain the degradation of the resin matrix.

Colour stability of 3D-printed resin orthodontic brackets

2021 ◽  
pp. 146531252110010
Author(s):  
Allison S Haynie ◽  
Jeryl D English ◽  
Rade D Paravina ◽  
Audrey Moon ◽  
James Hanigan ◽  
...  
Keyword(s):  
Accelerated Aging ◽  
Orthodontic Brackets ◽  
Colour Stability ◽  
Water Control ◽  
3D Print ◽  
Difference Formula ◽  
Before And After ◽  
Colour Changes ◽  
3D Printed

Objective: To evaluate the colour stability of polymeric resins that could be used to 3D-print orthodontic brackets. Design: In vitro, laboratory study Materials and Methods: Disc-shaped specimens were fabricated via 3D printing using three resins: Dental LT; Dental SG; and Clear. Five conditions were evaluated for each resin (n = 10 per treatment per resin) to assess its corresponding effect on colour and translucency: immersion in (1) red wine, (2) coffee, (3) tea and (4) distilled water (control), and (5) exposure to accelerated aging. Colour and translucency measurements were made before and after exposure using a spectrophotometer. Mean colour differences (ΔE00) and changes in translucency parameter (ΔTP00) were calculated for each sample using the CIEDE2000 colour difference formula. Results: Statistically significant effects of the resin material, the treatment condition and interactions effects of material and condition were observed for ΔE00 and ΔTP00 ( P < 0.001). The most pronounced changes in colour (ΔE00) were a result of the staining effects of wine on all three resins, ranging from 14.5 ± 0.6 to 20.8 ± 1.2. Dental LT, Dental SG and Clear resins all showed changes in colour when exposed to certain staining agents. Dental SG and Clear resins exhibited changes in colour with aging, while the colour of Dental LT resin remained stable with aging. Conclusions: The colour changes of the resins investigated does not support their use in 3D-printed aesthetic bracket applications.

scholarly journals Accelerated Aging Effects on Surface Hardness and Roughness of Lingual Retainer Adhesives

2008 ◽  
Vol 78 (1) ◽  
pp. 140-144 ◽  
Author(s):  
Sabri Ilhan Ramoglu ◽  
Serdar Usumez ◽  
Tamer Buyukyilmaz
Keyword(s):  
Surface Roughness ◽  
Vickers Hardness ◽  
Statistical Significance ◽  
Accelerated Aging ◽  
Aging Effects ◽  
Surface Microhardness ◽  
Halogen Light ◽  
Before And After ◽  
The Mean ◽  
Lingual Retainer

Abstract Objective: To test the null hypothesis that accelerated aging has no effect on the surface microhardness and roughness of two light-cured lingual retainer adhesives. Materials and Methods: Ten samples of light-cured materials, Transbond Lingual Retainer (3M Unitek) and Light Cure Retainer (Reliance) were cured with a halogen light for 40 seconds. Vickers hardness and surface roughness were measured before and after accelerated aging of 300 hours in a weathering tester. Differences between mean values were analyzed for statistical significance using a t-test. The level of statistical significance was set at P &lt; .05. Results: The mean Vickers hardness of Transbond Lingual Retainer was 62.8 ± 3.5 and 79.6 ± 4.9 before and after aging, respectively. The mean Vickers hardness of Light Cure Retainer was 40.3 ± 2.6 and 58.3 ± 4.3 before and after aging, respectively. Differences in both groups were statistically significant (P &lt; .001). Following aging, mean surface roughness was changed from 0.039 μm to 0.121 μm and from 0.021 μm to 0.031 μm for Transbond Lingual Retainer and Light Cure Retainer, respectively. The roughening of Transbond Lingual Retainer with aging was statistically significant (P &lt; .05), while the change in the surface roughness of Light Cure Retainer was not (P &gt; .05). Conclusions: Accelerated aging significantly increased the surface microhardness of both light-cured retainer adhesives tested. It also significantly increased the surface roughness of the Transbond Lingual Retainer.

scholarly journals Perubahan warna semen ionomer kaca setelah direndam dalam larutan teh hitam

2010 ◽  
Vol 9 (2) ◽  
pp. 123
Author(s):  
Wahyu Puri Wardhani ◽  
Asti Meizarini ◽  
Anita Yuliati ◽  
Retna Apsari
Keyword(s):  
Saline Solution ◽  
Glass Ionomer Cement ◽  
Measurement Data ◽  
Colour Change ◽  
Black Tea ◽  
Colour Stability ◽  
Glass Ionomer ◽  
Colour Measurements ◽  
One Way Anova ◽  
Ionomer Cement

Microporosity in glass ionomer cement contributes on its colour stability. In oralcavity GIC interacts with saliva, foods, drinks, and the oral hygiene condition whichcould affect in colour stability. This study aimed to examine the colour change in GICafter immersion in black tea solution. Twenty eight disc specimens (6 mm diameterand 1 mm thickness). The colour measurements were recorded after storage in closedtube for 24 hours. Specimens were randomly devided into 4 groups of 7 specimens.Control specimens were kept in saline solution. The other 3 groups were immersed inblack tea solution for 5 minutes respectively for 5, 7, and 14 times, followed by colourchange measurement. Data were submitted to one-way ANOVA and LSD. There wassignificant colour change in GIC after immersion in black tea. The conclusion islonger GIC immersed in black tea lower the intensity. The lowest intensity changingwas the immersed for 5 minutes, 14 times daily.

Evaluation of the colour stability of three different nano composites after bleaching with 10% carbamide peroxide: A spectrophotometeric study.

2019 ◽  
Vol 11 (2) ◽  
pp. 11-16
Author(s):  
Dr. Deena Elizabeth ◽  
Dr. Shibani Shetty ◽  
Dr. Jayalakshmi K B ◽  
Dr. Prasannalatha Nadig ◽  
Dr. Sujatha I
Keyword(s):  
Total Duration ◽  
Colour Change ◽  
Nano Composites ◽  
Distilled Water ◽  
Colour Stability ◽  
Carbamide Peroxide ◽  
Bleaching Procedure ◽  
Before And After ◽  
Group A ◽  
Group B

Objective: To evaluate the colour stability of three different nano composites using a spectrophotometer after bleaching with 10% carbamide peroxide. Materials and methods: Total of 60 composite disc were prepared and grouped as Group A (n = 20): ceram.x® SphereTEC™ one universal (Densply Asia), Group B (n = 20): Filtek Z250 XT (3M EPSE) and Group C (n = 20):Tetric N-Ceram ( Ivoclar Vivadent). Each group was further subdivided into 2 subgroups of 10 specimens, the control subgroup(n=10): where the samples were stored in distilled water and thetest subgroup(n=10): for which Opalescence PF (Carbamide peroxide 10%) was applied once daily for 4 hours for a total duration of 2 weeks. Color parameters were assessed using a spectophotometerbefore bleaching procedure and after 2 week of bleaching treatment for the test samples and in the control specimens before and after 2 weeks of storage in distilled water. The effect of the type of composite and bleaching agent on the colour parameters was analyzed with the two-way ANOVA. If the interaction effect was significant one-way ANOVA was used. Results: Group A (ceram.x®)showed the least difference in colour change after the bleaching procedure. Conclusion: Following bleaching with Opalescence PF, ceram.x® showed the best results of having clinically accepted colour stability.

scholarly journals Influence of Different Drinks on the Colour Stability of Dental Resin Composites

2009 ◽  
Vol 03 (01) ◽  
pp. 50-56 ◽  
Author(s):  
Fulya Toksoy Topcu ◽  
Gunes Sahinkesen ◽  
Kivanc Yamanel ◽  
Ugur Erdemir ◽  
Elif Aybala Oktay ◽  
...  
Keyword(s):  
Red Wine ◽  
Artificial Saliva ◽  
Colour Change ◽  
Resin Composites ◽  
Colour Stability ◽  
Dental Resin ◽  
Dental Resin Composites ◽  
Colour Measurements ◽  
Restorative Materials ◽  
Colour Changes

ABSTRACTObjectives: The objective of this study was to evaluate the discolouration effects of artificial saliva, granule lemon juice, coffee (without sugar), coca cola, sour cherry juice, fresh carrot juice and red wine on resin-based composite materials that are commonly used in restorative dentistry.Methods: Colour of four brands of resin composites (Filtek Z 250 (3M Espe), Filtek Supreme (3M Espe), Quadrant (Cavex), Charisma (Heraeus-Kulzer)) of A2 shade was measured after one day of immersion in eight different solutions. Colour measurements were obtained by using a XL-20 Trismus Colourimeter and colour differences (�E) were estimated. For statistical evaluation, analysis of variance (ANOVA), Dunnett and Tukey tests were used at a significance level of 0.05.Results: For the four restorative materials tested, the lowest ΔE values were observed in the artificial saliva, while ΔE values were the highest in red wine group. When comparing the four different restorative materials, Filtek Supreme exhibited the least colour changes whereas Filtek Z250 was the least colour-stable.Conclusions: Dental resin composites and drinking solutions were significant factors that may affect the colour stability. After immersion for one day, all materials showed visible colour changes. The red wine solution exhibited more staining than others in three groups. Filtek Supreme showed significantly the least colour change due to its nano particle sizes. (Eur J Dent 2009;3:50-56)

The study of colour changes under artificial weathering of light red meranti and yellow balau wood from Shorea genus

2020 ◽  
Vol 111 ◽  
pp. 37-42
Author(s):  
Agnieszka Jankowska
Keyword(s):  
Uv Irradiation ◽  
Wood Species ◽  
Wood Surface ◽  
Aging Process ◽  
Colour Change ◽  
Colour Stability ◽  
Artificial Weathering ◽  
Colour Parameters ◽  
Colour Changes ◽  
Weathering Process

The study of colour changes under artificial weathering of light red meranti and yellow balau wood from Shorea genus. This paper deals with the change in colour of selected tropical wood species from Shorea genus such as light red meranti and yellow balau. The artificial weathering method was used to determine the colour stability of wood surface. The used ageing method consisted of alternating soaking wood in water, drying at a temperature of 70°C and UV irradiation exposure. The colour changes were evaluated using CIE L*C*h system. Changes of particular colour parameters (lightness L*, chroma C*, hue h) were determine as well as the total colour change ΔE*. The results showed that tested species of wood change their colour similarly under the influence of the artificial weathering (the changes in the tested wood appearance occurred in similar scope). Surfaces of tested wood species initially became darker and then lighter. The largest changes in intensity of the colour of wood took place at the beginning of artificial weathering process. The intensity of changes decreased with the progress of aging process.

Estimating the pH of Commercially Available Dentifrices and Evaluating its Effect on Salivary pH After Brushing

2013 ◽  
Vol 7 (1) ◽  
pp. 12-16 ◽  
Author(s):  
P Gulati ◽  
S Dhingra ◽  
S Chand ◽  
Swatika LNU
Keyword(s):  
Study Groups ◽  
T Test ◽  
Significant Difference ◽  
Active Salt ◽  
Different Types ◽  
Salivary Ph ◽  
Before And After ◽  
The Mean ◽  
One Way Anova ◽  
Paired T Test

ABSTRACT Objectives The purpose of the study was to estimate the pH of commercially available dentifrices and evaluating its effect on salivary pH after brushing Material and Methods 60 study subjects were selected and were divided into 12 groups (each group comprises of 5 subjects). The salivary pH was directly estimated using the digital pH meter calibrated using buffers of pH 4, 7 and 22. Paired t test was used to compare the changes in the mean salivary pH after brushing in each group. One way ANOVA and Tukey's test was used to compare the changes in mean salivary pH after brushing between different groups. Results pH of different types of commercially available dentifrices which were used in the study was found to be 8.4, 7.9, 7.9, 6.7, 7.2, 8.3, 8.4, 7.1, 6.5, 5.6, 8.2 and 6.5 respectively. Difference in mean salivary pH after brushing was found to be statistically significant for Colgate, Neem active group, Vicco, Triguard, Colgate active salt, Dabur meswak, Dabur babool, Close-up active gel, RA Thermoseal, Dabur lal dant manjan, Colgate powder groups. Mean salivary pH (before and after brushing) between study groups showed a statistically significant difference. Conclusion The pH of saliva increases after brushing in each commercially available dentifrice group.

scholarly journals Quality of Sexual Life after Native Tissue Versus Polypropylene Mesh Augmented Pelvic Floor Reconstructive Surgery

2021 ◽  
Vol 10 (21) ◽  
pp. 4807
Author(s):  
Aleksandra Kamińska ◽  
Katarzyna Skorupska ◽  
Agnieszka Kubik-Komar ◽  
Konrad Futyma ◽  
Joanna Filipczak ◽  
...  
Keyword(s):  
Reconstructive Surgery ◽  
T Test ◽  
Sexual Life ◽  
Demographic Groups ◽  
Before And After ◽  
The Mean ◽  
Mean Differences ◽  
Active Patients ◽  
One Way Anova

There are still controversies around reconstructive surgeries used in POP treatment. The aim of this study was to compare the QoSL after VNTR vs. TVM surgery due to POP via the use of PISQ-12 and FSFI questionnaires. The study included a group of 121 sexually active patients qualified for reconstructive surgery due to symptomatic POP, and 50 control. The average results of PISQ-12 before and after surgery were compared using the t-test. The significance of the mean differences in demographic groups was measured using the t test for independent samples and one-way ANOVA. The results in the demographic groups were compared using the Mann–Whitney U test and the Kruskal–Wallis test. Fifty-eight women had VNTR, while 63 had TVM. Results of PISQ-12 revealed significant improvement in the sexual life after reconstructive surgery (27.24 vs. 32.43; p < 0.001, t = 8.48) both after VNTR and TVM. There were no significant differences in the assessment of the QoSL according to PISQ-12 and FSFI results between both analyzed groups of patients (PISQ-12: VNTR vs. TVM; t-test p = 0.19 and FSFI: VNTR vs. TVM; Mann–Whitney U test p = 0.54). VNTR is the treatment of choice in the case of uncomplicated primary POP.

scholarly journals AB0476 VITAMIN D SERUM CONCENTRATION VARIES ACCORDING TO DISEASE ACTIVITY IN SPONDYLOARTHRITIS

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 1265.2-1265
Author(s):  
M. Rato ◽  
F. Oliveira Pinheiro ◽  
S. Garcia ◽  
B. M. Fernandes ◽  
D. Fonseca ◽  
...  
Keyword(s):  
Vitamin D ◽  
Disease Activity ◽  
Mean Value ◽  
High Disease Activity ◽  
Inactive Disease ◽  
Before And After ◽  
The Mean ◽  
Post Hoc ◽  
One Way Anova ◽  
Very High

Background:Several studies have shown dissimilar results for the relationship between serum 25-hydroxyvitamin D concentration (25-OH-D) and disease activity in spondyloarthritis (SpA).Objectives:This study aims to assess whether vitamin D levels vary according to disease activity in patients with SpA before and after starting treatment with biologic disease-modifying anti-rheumatic drugs (bDMARDs).Methods:An observational retrospective study was performed in SpA patients followed in the Rheumatology department of a tertiary university hospital. Demographic and clinical data were collected from the Rheumatic Diseases Portuguese Register (Reuma.pt). Patients were assessed for 25-OH-D levels before and after 6 months of treatment with the first bDMARD. Correlation between 25-OH-D levels and disease activity measured by Ankylosing Spondylitis Disease Activity Score (ASDAS) at baseline and after 6 months were assessed using student’s t-test for two samples and one-way ANOVA and with post hoc tests for multiple comparisons.Results:A total of 189 patients were included. Ninety-seven patients were females (51.3%). The mean age at diagnosis was 34.8±11.2 years and the median disease duration at the start of the first bDMARD was 4.9 years (min: 0.1; max: 46.0). All patients fulfilled the ASAS criteria for SpA. Nonsteroidal anti-inflammatory drugs were used by 102 patients (54.0%) and conventional synthetic DMARDs by 69 patients (36.5%). At 6 months, 188 patients were treated with tumor necrosis factor inhibitors and one with interleukin-17 inhibitor. According to ASDAS criteria, at baseline 36.8% of patients had high disease activity and 59.5% had very high disease activity. After 6 months of treatment with bDMARD 14.7% of patients have inactive disease, 21.6% low disease activity, 36.3% high activity and 12.6% very high disease activity. The mean value of 25-OH-D at baseline was significantly lower in the group of patients with very high disease activity compared to the patients with high disease activity (21.9±11.1 ng/ml vs 26.1±11.6 ng/ml, p= 0.02). At 6 months of treatment the mean value of 25-OH-D in inactive, low, high and very high disease activity was 31.0±17.1ng/ml, 28.5±11.2ng/ml, 25.8±10.8ng/ml and 19.3 ±9.5ng/ml, respectively. There was a statistically significant difference between the groups, as determined by one-way ANOVA (p = 0.001). A post hoc Dunnett T3 test revealed that patients with very high disease activity have significantly lower mean 25-OH-D levels (19.29 ± 9.5) than patients with inactive disease (31.0 ± 17.1, p = 0.025) and low activity (28.5 ± 11.2, p = 0.009). Among the groups with high and very high disease activity, the significance is only marginal (p = 0.068).Conclusion:Vitamin D serum concentration varies according to disease activity in SpA. In fact, SpA patients with lower levels of 25-OH-D are associated with higher rates of disease activity, even in patients treated with biologics agents. It is important to be aware of vitamin D level as it can play a role in the management and treatment of the disease, mainly in the most severe patients.References:[1]Zhao SZ, Thong D, Duffield S, Goodson N. Vitamin D Deficiency in Axial Spondyloarthritis is Associated With Higher Disease Activity. Arch Rheumatol. 2017 Mar 24;32(3):209-215. doi: 10.5606/ArchRheumatol.2017.6212. PMID: 30375524; PMCID: PMC6190948.Disclosure of Interests:None declared.

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