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Öğe The Comparison of Different Surface Preparation Methods in Terms of Shear Bond Strength of Tri-ceram Porcelain-titanium Alloy(Galenos Yayincilik, 2019) Yilmaz, Berivan Dundar; Mese, Ayse; Kaya, EylemObjective: Several studies have been made to evaluate effects of the surface preparation on shear bond strength (SBS) of titanium-porcelain complex. However, a completed picture has not been obtained yet. Therefore, such studies appear frequently on recent literature. The purpose of this study is to determine a simple method providing strong SBS and using fewer parameters. Materials and Methods: Sixty titanium samples were equally divided into five groups. Group 1: Control (C). Group 2: Airborne-particle abrasion with 250 mu Al2O3 (250 mu AbPA). Group 3: Etching with 10% HCl (10% HCl). Group 4: Etching with Nd:YAG Laser at 6W (Nd6). Group 5: Etching with Nd:YAG laser at 7 W (Nd7). Results: Mean SBS value of C (10.69 MPa) was close to that of 250 mu AbPA (10.57 MPa). The mean value of 10% HCl (19.37 MPa) was nearly twice higher than C, whereas those of laser groups (8.89 MPa and 8.77 MPa) were smaller than C. There was no overlap between SBS values of samples etched with 10% HCl and those of other samples. Multiple comparisons indicated a significant difference between acid group and others (p=0.00). Laser groups were different from control, too. The failure mode of % HCl group was 67% adhesive and 33% mix, while those of other groups were cohesive or mix. Conclusion: Titanium surfaces etched with 10% HCl provides significantly strong SBS values. This method requires only the use of aqueous solution of 10% HCl, and boiling process for 30 minutes. Such a simplicity suggests that etching with 10% HCl provides a very simple surface preparation method which involves in use of fewer parameters.Öğe Comparison of the effect of storage media on shear punch strength of resin luting cements(Elsevier Sci Ltd, 2010) Bagheri, Rafat; Mese, Ayse; Burrow, Michael F.; Tyas, Martin J.Objectives: To measure the shear punch strength of eight resin-containing luting cements before and after immersion in acidic solution and ethanol at different temperatures (37 degrees C and 60 degrees C). Method: Specimens were prepared from six resin luting cements; Set (SDI), Panavia F (Kuraray), RelyX Veneer (3M/ESPE), Varioloinkll (Ivoclar), Maxcem (Kerr), Nexus2 (Kerr) and two Resin-modified glass-ionomer luting cements (RM-GICs); GC Fuji Plus (GC Corporation), RelyX Luting 2 (3 M/ESPE). For each material a total of 114 disc-shaped specimens were prepared. Six specimens were immersed in distilled water for 24h at 37 degrees C, polished and subjected to baseline measurement for shear punch strength. The remaining 108 specimens were randomly divided into 18 groups of six, and immersed in three solutions; distilled water, 0.01 mol/L lactic acid, and 50% ethanol at 37 degrees C or 60 degrees C, for 1 week, 1 month or 3 months. Specimens were washed, dried and tested for final shear punch strength. Results: Values were material and solution dependent. Values of Nexus 2 and Rely X Veneer are the highest, and Rely X Luting 2 the lowest. Ethanol and lactic acid specimens showed significantly lower values compared with the distilled water specimens. Conclusion: The shear punch strengths of the resin-containing luting cements were affected by time and storage solution. While some of the resin luting cements had significantly higher values compared to that of the RM-GICs, there were no significant differences between the RM-GICs and resin cements such as Panavia F and Set. (C) 2010 Elsevier Ltd. All rights reserved.Öğe Conjunctival impression cytology in patients with ectodermal dysplasia(Galenos Yayincilik, 2012) Soker, Sevda; Keklikci, Ugur; Mese, Ayse; Akkus, Murat; Nergiz, YusufEctodermal dysplasia is a group of symptoms affecting tissues and organs of ectodermal origin. In this study, conjunctival impression cytology technique which is a non-invasive method was performed in patients with ectodermal dysplasia to evaluate the affects on conjunctiva. Six eyes of three patients with ectodermal dysplasia who were followed up by the Ophthalmology Clinic of Dicle University Faculty of Medicine and Prosthetic Dentistry Departments were included in the study. Bulbar conjunctiva impression cytology method was applied to the upper surface of the bulbar conjunctiva and the cell groups taken to the surface of cellulose acetate paper were fixed by a solution containing 70% ethyl alcohol, 37% formaldehyde and glicial acetic acid with a ratio of 20:1:1 and later stained by periodic acid-schiff and haematoxylin-eosin. Using impression cytology method a decrease in integrity of the cells, picnotic changes in the nucleus, epithelial cell-like changes and loss of goblet cells were observed in patients with ectodermal dysplasia. The findings of eye dryness in patients with ectodermal dysplasia were supported by the impression cytology technique. Impression cytology can be used as a non-invasive method in ophthalmologic follow-up of patients with ectodermal dysplasia. (Turk Arch Ped 2012; 47: 69-72)Öğe Effect of argon plasma and Er:YAG laser on tensile bond strength between denture liner and acrylic resin(Mosby-Elsevier, 2020) Yildirim, Arzu Zeynep; Unver, Senem; Mese, Ayse; Bayram, Cem; Denkbas, Emir Baki; Cevik, PinarStatement of problem. The separation of a denture liner from the denture base can be a clinical problem. Different surface treatments to increase the bond have been evaluated, but studies comparing the effect of argon plasma and erbium-doped yttrium aluminum garnet (Er:YAG) laser on the bond between acrylic resin and a denture liner are lacking. Purpose. The purpose of this in vitro study was to evaluate the effect of argon plasma and Er:YAG laser treatments on the bond strengths of acrylic resin to 2 denture liners. Materials and methods. Heat-polymerized acrylic resin (Acron Duo) was bonded to silicone soft-liner materials (Molloplast B, n=30; Mollosil, n=30) to create control specimens (n=10), argon plasma treatment (n=10), and Er:YAG laser treatment (n=10). Silicone liners were polymerized on resin specimens. The tensile bond strength test was performed with a crosshead speed of 10 mm/min with a 10-N load until failure. Data were analyzed by using the Kruskal-Wallis test and unpaired t test (alpha=.05). Results. The laser group showed significantly higher bond strength than the argon plasma group for both Molloplast-B (P=.001) and Mollosil (P<.001). The highest tensile bond strength values were determined in the laser-treated Molloplast-B group (1.325 +/- 0.119 MPa) while the lowest bond strength values were determined in the Mollosil control group (0.384 +/- 0.018 MPa). Conclusions. Argon plasma and Er:YAG laser applications increases the tensile bond strength between soft-liner material and resin. Er:YAG laser treatment results in higher bond strength values than treatment with argon plasma for 1 minute.Öğe Effect of denture cleansers on the hardness of heat- or auto-cured acrylic- or silicone-based soft denture liners(Mosher & Linder, Inc, 2007) Mese, AysePurpose: To investigate the effect of short (24 hours) and long term (6 months) exposure to a variety of commercially available denture cleanser solutions on the hardness of a variety of acrylic- and silicone-based resilient liners that were either heat- or auto-cured. Methods: The denture liners investigated were an acrylic-based heat-cured (Vertex Soft), acrylic-based auto-cured (Coe-Soft), a silicon-based heat-cured (Molloplast-B) and silicon-based auto-cured (Mollosil Plus) resilient liners. Cylindirical specimens (20 mm diameter, 12 mm high) were made of each material, using 10 replications for each test condition. Immersion solutions consisted of distilled water (control), and those based on alcohol, chlorhexidine, or an alkaline peroxide (Dermacol, aqueous chlorhexidine, Steradent) as a major active component. Specimens were fabricated according to manufacturer directions. Shore-A durameter hardness readings were taken on all specimens at each time interval and then compared statistically using four-way ANOVA and Tukey HSD (alpha= 0.05). Results: The results of this study indicated that, compared with distilled water, significant effect on the hardness of the specimens were found after immersion in all of the denture cleanser solutions at 24 hours and at 6 months. Specimens immersed in chlorhexidine showed higher and significant hardness changes than those immersed in other cleanser solutions. Also, it was determined that hardness of resilient liner materials increased with time and significantly higher hardness was recorded at 6 months for the auto-cured specimens compared with their heat-cured counterparts.Öğe Effect of denture cleansers on the roughness of heat-or auto cured denture liners(Asian Journal Of Chemistry, 2008) Mese, AyseThis study investigated the effect of short (24 h) and long term (6 months) exposure to a variety of commercially available denture cleanser solutions on the roughness of a variety of acrylic-and silicone-based resilient liners that were either heat-or auto-cured. The denture liners investigated were an acrylic-based heat-cured (Vertex Soft), acrylic-based auto-cured (Coe-Soft), a silicon-based heat-cured (Molloplast-B) and silicon-based auto-cured (Mollosil Plus) resilient liners, Cylindirical specimens (14 mm dia, 1 mm replications for each high) were made of each material, using 10 re test condition, Immersion solutions consisted of distilled water (control) and those based on alcohol, chlorhexidine or an alkaline peroxide (dermacol, aqueous chlorhexidine, steradent) as a major active component. Specimens were fabricated according to manufacturer directions. Surface, roughness were taken on ill specimens at each time interval and then compared statistically using four-way ANOVAs and Tukey HSD (alpha = 0.05). The results of this study indicated that in comparison with distilled water, significant effect on the roughness of the specimens were found after immersion in all of the-denture cleanser solutions at 24 h and at 6 months. Specimens immersed in alkaline peroxide showed higher and significant toughness changes than those immersed in other cleanser solutions. It was also determined that roughness of resilient liner materials increased with time and significantly higher roughness was recorded at 6 months for the auto-cured specimens compared with their heat-cured counterparts. The increasing roughness was greatest in acrylic-based, auto-cured resilient liner in all cleansers especially in alkaline peroxide, which, suggests that the use of this resilient liner may not provide long-term clinical success.Öğe Effect of storage duration on the hardness and tensile bond strength of silicone- and acrylic resin-based resilient denture liners to a processed denture base acrylic resin(Mosby-Elsevier, 2008) Mese, Ayse; Guzel, Kahraman G.Statement of problem. Two potential problems commonly identified with a denture base incorporating a resilient liner are a failure of the bond between the acrylic resin and resilient liner material and a loss of resiliency of the resilient liner material over time. Purpose. This investigation evaluated the effect of storage duration on the tensile bond strength and hardness of acrylic resin- and silicone-based resilient liners that were either heat- or autopolymerized onto denture base acrylic resin. Material and methods. The denture liners investigated were a definitive acrylic resin-based heat-polymerized (Vertex Soft), interim acrylic resin-based autopolymerized (Coe-Soft), definitive silicone-based heat-polymerized (Molloplast-B), and definitive silicone-based autopolymerized (Mollosil Plus) resilient liner. The resilient liners were processed according to manufacturers' instructions. The resilient liner specimens for tensile bond strength testing (n=10) were 10 x 10 x 3 mm and were processed between 2 polymethyl methacrylate (PMMA) (Meliodent) blocks (40 x 10 x 10 mm). The resilient liner specimens for hardness testing (n=10) were 20 mm in diameter and 12 mm in height. Specimen shape and liner thickness were standardized. Specimens were stored for I day, I week, or 1, 3, or 6 months in water at 37C. Tensile bond strength was measured in a universal testing machine at a crosshead speed of 20 mm/min, and hardness was measured using a Shore A durometer. Two-way ANOVA and Tukey HSD tests were used to analyze the data (alpha=.05). Results. The results indicated that there were significant differences both in the hardness and bond strength values of resilient liner materials. The definitive silicone-based heat-polymerized (Molloplast-B) resilient liner had significantly higher bond strength and lower hardness values than the others. Prolonged exposure to water produced significantly higher hardness values and lower bond strength values. Conclusions. Within the limitations of this in vitro study, specimens of resilient liners immersed in water demonstrated significantly (P<.001) lower bond strength values and higher hardness values over time.Öğe The effects of nanofilled resin-based coatings on the physical properties of glass ionomer cement restorative materials(Elsevier Sci Ltd, 2019) Jafarpour, Dana; Mese, Ayse; Ferooz, Maryam; Bagheri, RafatObjectives: To determine the effect of two resin-based coatings on the water sorption/solubility and colour change of three conventional and two resin modified glass ionomer cement restorative materials. Methods: Five glass-ionomer cement (GIC) restorative materials and two nanofilled resin-based coatings were studied. Disc-shaped specimens of each material were prepared and divided into three groups, uncoated and coated with either of the two coatings tested (n= 8). Water sorption and solubility were measured in accordance with ISO 4049 and ISO 6876 instructions, respectively. For colour change, the specimens were immersed in distilled water for 24 h, then immersed for another 24 h and an extra week in the three solutions of lactic acid, coffee, and distilled water. The specimens were subjected to colour measurements, using a spectrophotometer after 24 h and 7 days of immersion. The colour change (Delta E) was calculated using a specific formula. ANOVA tests were used for data analysis. Results: Two-Way ANOVA revealed a significant interaction between materials and coatings for the water sorption/solubility values. Fuji Bulk showed the lowest water sorption/solubility and the coated groups showed a lower mean sorption/solubility and Delta E. The Delta E varied depending on the materials and the solutions. Conclusions: Coating of GIC restoratives reduced the water sorption/solubility and Delta E of almost all materials with a significant decline in most of the materials. Clinical significance: Coating of GIC restorations in the oral environment with resin-based coating may protect the restorations from early water sorption/solubility and discolouration.Öğe Fracture toughness of seven resin composites evaluated by three methods of mode I fracture toughness (KIc)(Japanese Soc Dental Materials Devices, 2016) Mese, Ayse; Palamara, Joseph E. A.; Bagheri, Rafat; Fani, Mehdi; Burrow, Michael F.This study compared the fracture toughness values of seven resin composites and analyzed the consistency of data values using three methods: compact tension, three point and four point bending for Mode I failure. Seven resin composites were selected: Estellite Sigma Quick, Esthet X HD, Filtek Supreme XTE, Heliomolar, Ice, Rok, and Vit-l-escence. For each material, 18 specimens (n=6 for each test) were prepared. Maximum load to failure was recorded using a universal testing machine and fracture toughness was calculated. There was a direct significant correlation among all tested methods. Rok showed the highest and Estelite the lowest K-Ic values. SEM of the fractured surface of compact tension method showed propagation of the cracks from stresses concentrating at the corner of the notch and the surface of the sample. Four-point test gave the largest range in K-Ic, and was a simple method to discriminate between the resin composite values of K-Ic.Öğe Influence of beverages and surface roughness on the color change of resin composites(Wiley, 2018) Tavangar, Maryam; Bagheri, Rafat; Kwon, Tae-Yub; Mese, Ayse; Manton, David J.AimThe aim of the present study was to determine the degree of surface staining and roughness of resin composites (RC) after finishing and polishing with different methods and immersion in three soft drinks. MethodsA microhybrid, a nanohybrid, and a hybrid composite were selected. The specimens were prepared and divided into three groups of 36 after 24hours, and designated as either unpolished or polished using Sof-Lex discs or Enhance point. Each group was further divided into three subgroups, immersed in distilled water, coffee, or cola for 1week (N=12). Color change (E) was measured by a spectrophotometer after each treatment. The E was calculated using the following formula: E=([L]2+[a]2+[b]2)1/2. Surface roughness (Ra) was measured after 24hours and 1week. To observe the Ra, a scanning electron microscope was used. ResultsA moderate correlation between Ra and E was determined. Only coffee caused perceptible E. The effect of Ra on staining was statistically significant (P<.05), but immersion in solutions for 7days did not increase the Ra of RC. ConclusionsThe highest Ra values were obtained from hybrid RC. The Enhance point created the greatest roughness. Coffee was associated with the greatest E for all materials and polishing methods.Öğe Laser Application to the Root Surface Increases the Bonding Strength of Surface-Treated Prefabricated Glass-Fiber Posts in Teeth with Excessive Substance Loss(Int Scientific Literature, Inc, 2018) Gorus, Zuhal; Mese, Ayse; Yilmaz, Berivan Dundar; Adiguzel, OzkanBackground: This study examined the effect of roughening of the root surface using an erbium-doped yttrium aluminum garnet (Er: YAG) laser on the binding strength of teeth undergoing root canal treatment. Material/Methods: Ninety single-rooted teeth were used and assigned randomly to 9 groups (n=10 each). Root canals were prepared using the FlexMaster rotary system. An Er: YAG laser was applied to the root canals in Group 1, with no surface treatment of the glass-fiber post. In Group 2, aluminum oxide particles were applied. In Group 3, the laser was applied to the root canals, with Cojet treatment. Group 4 received laser treatment and Clearfil Ceramic Primer. In Group 5, Clearfil Ceramic Primer silane coupling was performed on post surfaces without laser treatment. In Group 6, hydrofluoric acid (HF) application was followed by Clearfil Ceramic Primer cementing of the glass post surfaces with laser application. In Group 7, HF acid treatment was performed without laser. In Group 8, the laser was applied, followed by sanding of post surfaces using Korox 50, and silane coupling with Clearfil Ceramic Primer. In Group 9, the post surfaces were sanded using Korox 50 with laser application to the root canals. The samples were subjected to a push-out experiment. The data were analyzed using Friedman's test and the Wilcoxon signed-rank test. Results: A significant difference in bonding strength was found among the groups (p < 0.005). Conclusions: Use of an Er: YAG laser in the root canal may be beneficial prior to bonding of glass posts.Öğe Removable Partial Denture in a Cleft Lip and Palate Patient: A Case Report(Korean Acad Medical Sciences, 2008) Mese, Ayse; Oezdemir, EylemThis clinical report described the oral rehabilitation of a deft lip and palate patient with removable partial denture. Although implant-supported fixed treatment was presented as part of the optimum treatment plan to achieve the best result, the patent declined this option due to the significant financial burden. Persons with a congenital or craniofacial defect are unique, and oral problems must be evaluated individually to the most ideal treatment. The changes in appearance, function, and psychological wellbeing have an enormous impact on patients' personal lives and are rewarding for the maxillofacial prosthodontist providing this care.Öğe Sorption and solubility of luting cements in different solutions(Japanese Soc Dental Materials Devices, 2008) Mese, Ayse; Burrow, Michael F.; Tyas, Martin J.This study examined the solubility, sorption, and dimensional change of eight luting cements in two different solutions: 50% ethanol:water and distilled water. Ten disk specimens were prepared of each material following the manufacturers' instructions, and then ground with silicone carbide paper. Sorption and solubility were calculated by weighing the specimens before and after immersion and desiccation. Data were analyzed by two-way ANOVA, Tukey's HSD and Fisher's PLSD tests. GC Fuji Plus and RelyX Luting2 showed the highest values of sorption and solubility both in water and ethanol:water. The percentage changes in volume for Maxcem, Nexus 2, Panavia F, RelyX Veneer, and VariolinkII were considerably smaller than for GC Fuji Plus, RelyX Luting2, and seT in both water and ethanol:water and after desiccation. Stability occurred within 2 weeks for all the eight materials when in water, while GC Fuji Plus, Maxcem, Panavia F and seT took 3 to 4 weeks to stabilize in ethanol:water.
