Evaluation of Color Stability and Surface Roughness of Bulk-Fill Resin Composites and Nanocomposites

WOS: 000419193400008Objective: the purpose of this study was to evaluate the color stability and surface roughness of four bulk-fill resin composites (SonicFill, Filtek Bulk Fill Flowable, X-tra fil, Filtek Bulk Fill Posterior) and three nanocomposites (G-aenial Universal Flo, Herculite XRV Ultra, Filtek Ultimate) after an aging simulation. Materials and Methods: the upper surfaces of prepared composite discs were polished with Sof-Lex discs. the samples were subjected to a thermocycling process for 3000 cycles, then immersed in the prepared mixture solution for two weeks. Before and after the aging simulation, profilometer and spectrophotometer were used to measure surface roughness (Ra) and color of the composite discs. the color change (Delta E) of each material was calculated. Results: the Delta E values showed a statistically significant difference among the studied materials (p<0.001). the Ra values of X-tra fil, Filtek Bulk Fill Flowable, SonicFill, and Filtek Bulk Fill Posterior were significantly increased by the aging process (p<0.001), while G-aenial Universal Flo, Filtek Ultimate, and Herculite XRV Ultra showed steady roughness (p<0.001). Conclusion: Filtek Ultimate showed greater susceptibility to staining. Microhybrid X-tra fil and nanohybrid SonicFill with higher filler amounts revealed more surface deterioration

The effect of Er:YAG laser irradiation on the bond stability of self-etch adhesives at different dentin depths

caglar, ipek/0000-0002-2286-4657WOS: 000403471600001PubMed: 28357598The aim of this study was to evaluate the effect of Er:YAG laser irradiation on the micro-shear bond strength of self-etch adhesives to the superficial dentin and the deep dentin before and after thermocycling. Superficial dentin and deep dentin surfaces were prepared by flattening of the occlusal surfaces of extracted human third molars. the deep or superficial dentin specimens were randomized into three groups according to the following surface treatments: group I (control group), group II (Er:YAG laser; 1.2 W), and group III (Er:YAG laser; 0.5 W). Clearfil SE Bond or Clearfil S-3 Bond was applied to each group's dentin surfaces. After construction of the composite blocks on the dentin surface, the micro-shear bond testing of each adhesive was performed at 24 h or after 15,000 thermal cycles. the data were analyzed using a univariate analysis of variance and Tukey's test (p 0.05). However, deep-dentin specimens irradiated with laser showed significantly higher bond strengths than did control specimens after thermocycling (p < 0.05). Thermocycling led to significant deterioration in the bond strengths of all deep-dentin groups. the stable bond strength after thermocycling was measured for all of the superficial-dentin groups. No significant difference was found between the 0.5 and 1.2 W output power settings. in conclusion, the effect of laser irradiation on the bond strength of self-etch adhesives may be altered by the dentin depth. Regardless of the applied surface treatment, deep dentin showed significant bond degradation

Efficacy of Mouthwashes Containing Hydrogen Peroxide on Tooth Whitening

The aim of this study was to analyze the efficacy of mouthwashes containing hydrogen peroxide compared with 10% carbamide peroxide (CP) gel. Fifty enamel-dentin samples were obtained from bovine incisors and then stained in a tea solution. The stained samples were randomly divided into five groups according to the whitening product applied (n=10): AS: no whitening (negative control), with the samples stored in artificial saliva; CR: Crest 3D White mouthwash; LS: Listerine Whitening mouthwash; SC: Scope White mouthwash; and OP group: 10% CP Opalescence PF (positive control). Color measurements were carried out with a spectrophotometer before staining, after staining, and on the 7th, 28th, and 56th day of the whitening period. The data were analyzed using two-way analysis of variance followed by a Tukey post hoc test. The color change (ΔE) was significantly greater in all the groups compared to that of the AS group. After 56 days, no significant differences were found among the mouthwash products with respect to color change (P>0.05). The whiteness of the teeth treated with the mouthwashes increased significantly over time. Nevertheless, the color change achieved with the mouthwashes was significantly lower than that achieved with the 10% CP at-home bleaching gel

Influence of a short-time antioxidant application on the dentin bond strength after intracoronal bleaching

Karadas, Muhammet/0000-0002-3357-6896WOS: 000477493100001PubMed: 31290589This study evaluated the effects of an antioxidant application on the compromised bond strength of an adhesive to dentin bleached with 35% hydrogen peroxide. the dentin surfaces of the pulp chambers of 70 human third molars were ground, and the specimens were assigned randomly into seven groups, as follows: (a) control (unbleached); (b) bleached for 45 min, bonded immediately; (c) bleached for 45 min, treated with sodium ascorbate (SA) for 2 min, and bonded; (d) bleached for 45 min, bonded after 2 weeks; (e) bleached for 12 days, bonded immediately; (f) bleached for 12 days, treated with SA for 10 min, and bonded; and (g) bleached for 12 days, bonded after 2 weeks. in each group, the multimode adhesive was applied in etch-and-rinse and self-etch modes. the dentin surfaces were covered with a resin-based composite, and the bonded specimens were sectioned to produce composite-dentin sticks. the sticks were attached to a testing machine and subjected to a tensile force, and the representative specimens were examined via scanning electron microscopy. the bond strength was not affected by the application period of the bleaching agent. Both bleaching treatments significantly reduced the bond strength to the dentin in the self-etch or etch-and-rinse mode when compared with the control group. the bond strengths returned to normal levels with the SA applications or by waiting 2 weeks, regardless of the application period of the bleaching gel. the adhesive revealed a higher bond strength in the etch-and-rinse mode than in the self-etch mode

Bond strength and adaptation of pulp capping materials to dentin

BEDIR, M.Gamze ATICI/0000-0002-9666-9248WOS: 000506072900001PubMed: 31912929This study evaluated the shear bond strength (SBS) and internal marginal adaptation of pulp-capping materials to dentin. Flat occlusal deep dentin surfaces were produced and randomly assigned to two groups (sound or artificial caries-affected dentin). the specimens in each group were assigned to one of seven subgroups according to the materials used: Biodentine, Theracal LC, Ultra-Blend plus, Calcimol LC, ApaCal ART, EQUIA Forte, and Ionoseal. Buildups (3-mm inner diameter and 2-mm deep) were made over the dentin surfaces. the bonded specimens were tested under shear forces at a crosshead speed of 0.8 mm/min and fracture modes were determined using a stereomicroscope at 25x magnification. the materials were applied to the pulp floor of prepared Class I cavities and then the cavities were restored with composite resin. Restored molar teeth were subjected to 5,000 thermocycles and sectioned in a bucco-lingual direction. Resin replicas were made to determine the adaptation at the pulp floor with scanning electron microscopy. Significant differences were determined among both bond strengths and gap formations of the materials. EQUIA Forte applied to both dentin substrates had a significantly higher SBS than the other materials. the bond strength of each material was not influenced by the dentin condition. Biodentine (3.03%), EQUIA Forte (7.83%), and Theracal LC (13.37%) had lower gap formations compared to other materials but were not significantly different from each other.Recep Tayyip Erdogan UniversitesiRecep Tayyip Erdogan University [TSA-2018-946]Recep Tayyip Erdogan Universitesi, Grant/Award Number: TSA-2018-94

Effect of thermocycling on the amount of monomer released from bulk fill composite resins

Hatipoglu, Omer/0000-0002-4628-8551; Karadas, Muhammet/0000-0002-3357-6896WOS: 000510806600019PubMed: 31582597The goal of this study was to examine the effect of thermal cycling on the amount of monomer released from bulk fill composites. Five bulk fill composite resins were used in the study. Extraction solutions were obtained at the end of the time/thermal cycle periods: 0-1 day/0-1,500, 1-3 days/1,500-4,500 and 3-7 days/4,500-10,000. the monomers in the extractions samples taken at each time point were measured on an HPLC instrument. the obtained data were analyzed by repeated measures of variance analysis and tukey multiple comparison tests (p<0.05). the thermocycling increased the amount of monomer released from all composites at 0-1 day (p<0.05). At 0-1 and 1-3 days, Venus Bulk Fill and Filtek Bulk Fill composite resins were more affected. Polymer networks with high molecular weight monomers such as Bis-GMA and UDMA can be less affected by thermal changes compared to polymers with low molecular weight monomers.Recep Tayyip Erdogan University Research FundRecep Tayyip Erdogan University [2015.53001.111.03.01]The data presented in this study are a part of the doctoral thesis of Mr. Omer HATIPOGLU. This study was supported by Recep Tayyip Erdogan University Research Fund under Grant (Project code: 2015.53001.111.03.01)

Influence of different light-curing units on monomer elution from bulk fill composites

Hatipoglu, Omer/0000-0002-4628-8551; Karadas, Muhammet/0000-0002-3357-6896WOS: 000456292100008Objectives: This in vitro study assessed the effect of different light-curing units on the elution of monomers from bulk fill composites with different thicknesses. Methods: Five bulk fill composites (Filtek Bulk Fill Flowable, SonicFill 2, SDR, Tetric N-Ceram Bulk Fill, and Venus Bulk Fill) and one conventional composite (Filtek Z250) were selected for the study. the cylindrical specimens in thickness of 2 mm or 4 mm were prepared and photopolymerized for 20 s with a light-emitting diode (VALO Cordless) or a halogen (Monitex BlueLuxer) light-curing unit. the specimens in glass vials were covered with a 75% ethanol/water solution. Ethanol/water extraction solutions were collected for high-performance liquid chromatography analysis after 24 h, 3 days, and 7 days. the data were analyzed with repeated measures and three-way ANOVA (p < 0.05). Results: the total monomer amount was significantly influenced by light-curing source used and thickness. the highest levels of Bis-GMA and Bis-EMA were eluted from Tetric N-Ceram BulkFill and Venus Bulk Fill, respectively. SonicFill 2 released the highest level of TEGDMA at 4-mm thickness. the highest levels of UDMA release, from 4-mm-thick Filtek Bulk Fill Flowable, were attained using the halogen unit. Conclusions: Light-curing sources affected the number of monomers released by materials. the amount of eluted monomers declined over time. the increased ratio of released monomers to increased thickness is material dependent. the number of residual monomers is highly associated with the resin ratio and crosslinking network of the composites.Recep Tayyip Erdogan University Research FundRecep Tayyip Erdogan University [2015.53001.111.03.01]1 This study was supported by Recep Tayyip Erdogan University Research Fund under Grant (Project code: [2015.53001.111.03.01])

In Vitro Evaluation of the Efficacy of Different Over-the-Counter Products on Tooth Whitening

PubMed: 26312975This in vitro study evaluated the whitening effect of four different over-the-counter products compared with a 10% carbamide peroxide (CP) bleaching gel. Specimens obtained from bovine incisors were stained in a tea solution and randomly divided into six groups according to the product used (n=10): CT: conventional toothpaste (negative control); CWT: Crest 3D White toothpaste; CWR: Crest 3D White mouth rinse; CWS: Crest 3D White strips; DW: Dazzling White (paint-on gel); and OP: Opalescence PF 10% CP (at-home bleaching gel, positive control). Over-the-counter products and 10% CP were used according to the manufacturer’s recommendations. Color measurements were performed according to the CIELab system using spectrophotometer after staining, and after 4 and 8 weeks of the treatment procedure. The ?E, ?L, ?a, and ?b values were calculated. The data obtained were analyzed by repeated-measures ANOVA. Tukey’s test for multiple comparisons was applied (p<0.05). All groups, except CWT, were effective in tooth whitening in comparison with conventional toothpaste. There was no significant difference in tooth whitening between CWT and CT (p=0.93). CWS, DW and OP groups presented significantly higher color changes than the CWR group. DW and CWS showed similar tooth whitening to OP. © 2015, Associacao Brasileira de Divulgacao Cientifica. All rights reserved