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MANAV, AYBİKE

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MANAV

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AYBİKE

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    Surface Alterations of Resin Composites: Press-on-Force-Guided Brushing Simulator with Calcium-Active Whitening- Toothpastes
    (2023-07-03) SEVER, DENİZ MELTEM; DOĞU KAYA, BENGÜ; MANAV, AYBİKE; ALKAN, ELİF; YILMAZ ATALI, PINAR; KORKUT, BORA; TAĞTEKİN, DİLEK; SEVER D. M., DOĞU KAYA B., MANAV ÖZEN A., Öztürk S., ALKAN E., YILMAZ ATALI P., KORKUT B., TAĞTEKİN D.
    Introduction: The purpose was to investigate the surface roughness and the color changes of nanohybrid and microhybrid resin composites subjected to calcium active whitening toothpastes with different RDA values through a novel Press-on Force-Guided (PFG) Brushing Simulator. Material and Methods: Twenty-eight disc-shape samples (10x2mm) of a nanohybrid (Herculite, Kerr) and a microhybrid (Z250, 3M) composites were prepared and randomly divided into 4 subgroups (n=7). The samples were polymerized with a LED-curing unit with an irradiance of 1000 mW/cm2 (Valo Cordless, Ultradent). Finishing and polishing procedures were performed with 2 fine grits of Sof-Lex Discs (3M). Samples were stored in distilled water at 37°C for 24 hours. Composite samples were brushed with a medium-bristle toothbrush (ROCS Pro 5940, ROCS) using the PFG brushing simulator (Marmara University, Turkey) for 60.000 strokes (correspondence to 6 years clinically) in a slurry containing toothpaste with 120 RDA (Ca Active Whitening, ROCS) and 70 RDA (Electro Whitening, ROCS) under 300-320g load (200 strokes/min). In particular, surface roughness (Ra) and color change (ΔE) were investigated utilizing profilometer (MarSurf PS 10, Mahr) and spectrophotometer (Easy-Shade-5, VITA). Analysis of variance was used for repeated measurements; Bonferroni test was used for pairwise comparisons. The level of significance was set at p<0.05. Results: After brushing Ra values did not show a significant difference (p>0.05) except Herculite group brushed with Electro whitening (p=0.05) which showed the most roughness change (36.99%). There is a significant difference between Herculite (1.163±0.701) and Z250 (0.400±0.154) in Ra values after electro-whitening brushing (p=0.002). No significant color change was observed in any group, regardless of composite or tooth-paste type (p>0.05). ΔE values of Herculite (1.007±0.463; 1.100±0.452) and Z250 (1.558±0.618; 1.196±0.835) brushed with Ca Active Whitening and Electro Whitening toothpastes were less than 1.8 respectively. Conclusion: Tooth brushing with Ca active whitening toothpastes (different RDA values) affected differently on the surface roughness of Herculite and Z250 due to their filler and resin composition, but there is no effect on color. Keywords: brushing simulator, resin composite, whitening toothpaste, surface roughness, color change
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    PublicationOpen Access
    Assessment of micro-hardness, degree of conversion, and flexural strength for single-shade universal resin composites
    (2022-11-01) YILMAZ ATALI, PINAR; TARÇIN, BİLGE; ŞENOL, AYŞE ASLI; TÜTER BAYRAKTAR, EZGİ; KORKUT, BORA; BİLGİN GÖÇMEN, GÜLÇİN; TAĞTEKİN, DİLEK; TÜRKMEN, CAFER; DOĞU KAYA, BENGÜ; MANAV, AYBİKE; YILMAZ ATALI P., DOĞU KAYA B., MANAV ÖZEN A., TARÇIN B., ŞENOL A. A. , TÜTER BAYRAKTAR E., KORKUT B., BİLGİN GÖÇMEN G., TAĞTEKİN D., TÜRKMEN C.
    © 2022 by the authors.Single-shade universal resin composites (SsURC) are preferred in clinical practice to reduce time for shade selection and obtain good esthetic results. In this study, the static mechanical properties of seven new SsURCs were investigated, their spectral analyzes were performed and scanning electron microscopy (SEM) evaluations were presented. Charisma Diamond One/DO, Admira Fusion x-tra/AFX, Omnichroma/OC, OptiShade/OS, Essentia Universal/EU, Zenchroma/ZC, Vittra APS Unique/VU were used in a three-point bending test to determine flexural strength (FS) and elastic modulus (EM); Vickers micro-hardness (VHN) and hardness-ratio (HR) were performed with a micro-hardness tester from top/bottom after 24-h/15-days of storage in distilled water at 37 °C (±1 °C). The degree of conversion (DC) was assessed by using Fourier transform infrared spectroscopy (FTIR). The structure of the resin matrix and filler content were assessed by SEM. Data were analyzed using IBM SPSS V23 and the R program and the significance level was taken as p < 0.05. The main effect of the tested SsURCs was found to be statistically significant on FS, EM, VHN, and DC values (p < 0.001). Bis-GMA free SsURCs (AFX, DO, VU) showed better DC and HR except for OC. All seven tested SsURCs conform to the requirements of ISO standards for dental resin composites for all tested categories.