Browsing by Author "Can, D.B."

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Effect of Cavity Disinfection Protocols on Microtensile Bond Strength of Universal Adhesive To Dentin
(Universidad de Costa Rica, 2022) Can, D.B.; Dundar, A.; Barutcugil, Ç.
The purpose of this study was to compare the effect of different disinfection protocols of dentin on bond strength of an MDP-containing universal adhesive. Twelve extracted mandibular third molars were separated horizontally at the mid-coronal of crown to get smooth and sound dentin surfaces using low-speed diamond saw. The teeth were randomly fallen into four groups: chlorhexidine (CHX), ozone, Er,Cr:YSGG laser irradiation (LASER) and no treatment (control). After cavity disinfection application, a universal adhesive (G-Premio Bond) was applied to the surface of dentin according to self-etch mode as instructed by the manufacturer. After incremental built-up of composite resin (Charisma Smart), the specimens were immersed in distilled water at 37°C for 24h. Dentin/composite beams with 1 mm² cross sectional area were produced and micro-tensile bond strength (µTBS) was applied on these beams (n=20). Failure mods were determined under a stereomicroscope at ×40. The resin penetration of samples stained with Rhodamine B fluorochrome dye was examined with a confocal laser scanning microscope. Statistical analysis was performed with SPSS-22. Test results were analyzed using One-way Anova and Tukey HSD Post-Hoc tests (p<0.05). The µTBS value of control (35.13±6.20) was the highest statistically among the groups (p<0.05). The lowest µTBS were obtained by LASER (19.25±4.66) and CHX (23.07±7.01). There was no significant difference between CHX and LASER, and between CHX and ozone (p>0.5). All applications of cavity disinfection procedures decreased the µTBS of the resin-dentin interface. © 2022, Universidad de Costa Rica. All rights reserved.
Effect of Whitening Mouthwash on Color Change of Discolored Bulk-Fill Composite Resins#
(Cumhuriyet University Faculty of Dentistry, 2022) Can, D.B.; Özarslan, M.
Objectives: The aim of this in-vitro study is to investigate discoloration of the composite resins with different characteristics which were colored by immersing in coffee, kept in mouthwashes with and without hydrogen peroxide. Materials and Methods: In this study, 18 samples (6 mm x 2 mm) pre-heated bulk-fill (Viscalor Bulk -(VIS)), dual-cured (Fill Up!-(FUP)) bulk-fill and a microhybrid composite resin (G-aenial posterior-(GCP)) were prepared. After the samples were kept in distilled water for 24 hours, baseline colour measurements were performed with a spectrophotometer. ΔE001 color measurements were made of the samples immersed in coffee for 7 days. The samples were divided into two groups to be kept in mouthwashes with hydrogen peroxide (Crest 3D White) and without hydrogen peroxide (Listerine Advance White) (n=9). ΔE002 color measurements were applied after kept in whitening mouthwashes for 24 hours. Discoloration were calculated with the CIEDE2000 formula. Data were statistically analysed with One-way ANOVA and post hoc tukey tests. Results: For samples immersed in coffee, while statistically highest AE values were obtained in GCP (7.30) group, there was no difference between VIS (3.30) and FUP (3.01). Statistically significant colour reduction was observed in VIS and FUP samples kept in both mouthwashes. GCP samples showed colour change above the clinically acceptable threshold (ΔE<2.25). Conclusions: A decrease in discoloration for all materials was found as an effect of whitening mouthwashes. However, GCP showed clinically unacceptable discoloration after immersed in coffee or mouthwashes. Both whitening mouthwashes provided effective whitening for VIS and FUP groups. © 2022. All Rights Reserved.
Effect of Whitening Mouthwashes on Hybrid Ceramic With Different Surface Treatments
(Yuzuncu Yil Universitesi Tip Fakultesi, 2022) Özarslan, M.; Can, D.B.
The purpose of this study is to investigate the effects of t hree whitening mouthwashes with various contents on hybrid ceramics with three different surface treatments in terms of color change. Samples of 7x5x1 mm dimensions were prepared from hybrid ceramic blocks (Vita Enamic-VE). The surfaces of the samples were standardized with silicon carbide papers. The samples were randomly divided into 3 groups (Group C: no additional polishing, Group L: VE technical kit and Group G: glaze was applied) (n=24). All samples were kept in coffee for seven days after the initial colors were recorded. Following the second color measurement (ΔE001), each group was divided into 3 subgroups and kept in whitening mouthwashes with differ ent contents (Containing hydrogen peroxide, non-hydrogen peroxide and activated carbon) for 24 hours (n=8). The final color measurement was measured (ΔE002). Color changes were evaluated according to CIEDE2000. Shapiro-Wilk, One way ANOVA and post hoc Tukey tests were used for statistical analysis of the data (p˂0.05). There was a significant difference in all groups for ΔE001, with the highest in Group C (Group L and Group G, respectively). The mouthwashes showed similar color changes on VE with different surface treatments (p≥ 0.05). Group C showed a significantly higher ΔE002 value than Group G in containing hydrogen peroxide mouthwash. Clinically acceptable color changes were observed in groups G and L after kept in coffee. After immersion in whitening mouthwash, all groups showed values below the threshold of perceptibility and acceptability (50:50% acceptability ΔE= 1.8, perceptibility ΔE=0.8). © 2022, Yuzuncu Yil Universitesi Tip Fakultesi. All rights reserved.
Pre-Heating Effect on the Microhardness and Depth of Cure of Bulk-Fill Composite Resins
(Universidad de Costa Rica, 2022) Değirmenci, A.; Can, D.B.
The aim of this study was to investigate the effect of preheating three bulk-fill and one conventional composite resin on the Vickers microhardness and depth of cure of these composites. In this study, three bulk-fill composites-SDR Plus (SDR), Estelite BULK FILL Flow (EST), Admira® Fusion x-tra (AFX), and one conventional composite resin G-ænial POSTERIOR (GP) were used as the control group. The samples were obtained at room temperature (24°C) and at 55°C in T2 mode after being placed in a heating device for 10 minutes. The samples were divided into eight groups (n=10) according to the type of material and heating process that was utilized (preheated and nonheated). All samples were tested with a Vickers microhardness (VHN) tester on the bottom and top surfaces. The first measurements were obtained at baseline; the second set of measurements was performed after the samples were stored in distilled water at 37°C for 24 hours. The depth of cure was calculated using a bottom/ top hardness ratio of measurements. Statistical analysis was performed utilizing the SPSS V23 and Shapiro-Wilk tests. Lastly, the Duncan test was used for multiple comparisons (p<0.05). While the VHN increased after the preheating procedure in bulk-fill composites, it decreased in GP. There was no difference between the baseline and the 24-hour VHN values in SDR and GP. After 24 hours, while the VHN of EST increased, the VHN of AFX decreased. There was no difference between the hardness ratios of the AFX and EST samples (p<0.001) and hardness ratios were greater than GP and SDR. When comparing the baseline and the 24-hour values, the VHN depended on the type of materials. Sufficient curing depth was obtained in all groups with a thickness of 2mm. © 2022, Universidad de Costa Rica. All rights reserved.