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Öğe Bond strength of two total-etching bonding systems on caries-affected and sound primary teeth dentin(WILEY, 2008) Tosun, Gul; Koyuturk, Alp Erdin; Sener, Yagmur; Sengun, AbdulkadirAim. As bond strength of currently available adhesive systems in caries-affected teeth dentin on primary tooth dentin was not well known, the bond strength of two bonding systems (PQI and OptiBond Solo Plus) was evaluated on caries-affected and sound primary molar tooth dentin and observed the micromorphology of the adhesive-dentin interfaces. Methods. By grinding both the sound (n = 30) and caries-affected (n = 30) approximal surfaces of teeth, flat dentin surfaces were obtained. The prepared surfaces were bonded with one of the each adhesive systems and a composite resin. After storing the bonded specimens in water at 37 degrees C for 24 h, the samples were sectioned and the bond strength of the adhesive systems was tested by the microshear test method. The data were statistically analysed. Results. Microshear bond strengths of PQI group for caries-affected and sound primary tooth dentin were 9.43 +/- 2.44 (MPa) and 9.32 +/- 2.95 (MPa) (P > 0.05), respectively, and the bond strengths of OptiBond Solo Plus group for caries-affected and sound primary tooth dentin were 15.33 +/- 3.59 (MPa) and 11.96 +/- 2.30 (MPa) (P < 0.05), respectively. Micromorphological features between sound and caries-affected dentin were similar in both PQI and OptiBond Solo Plus groups. Conclusion. Both the adhesives showed significantly different bond strengths in caries-affected dentin but showed similar bond strengths in sound dentin.Öğe Effect of endodontic sealers on bond strength of restorative systems to primary tooth pulp chamber(ELSEVIER TAIWAN, 2017) Elbay, Ulku Serment; Tosun, GulBackground/purpose: Although current literature suggests that root canal sealers affect the bonding ability of restorative systems to pulp chamber dentin of permanent teeth, primary teeth have not been investigated. This study intended to evaluate the microtensile bond strength (mu TBS) of three restorative systems to pulp chamber dentin in primary teeth and to determine the effect of two different root canal sealers on the mu TBS. Materials and methods: Ninety primary molars were used in this study. The teeth were randomly divided into three main groups according to canal sealers: (1) control (without sealer); (2) Metapex; and (3) zinc-oxide eugenol. The main groups were further divided into three subgroups depending on the coronal restorative system: (1) compomer (Prime Bond NT thorn Dyract EXTRA); (2) composite (Clearfil Tri-S Bond thorn Clearfil Photo Posterior); and (3) resin-modified glass ionomer (Fuji II LC). After restoration, the buccal wall of the pulp chamber was sectioned to obtain sticks (1 mm x 1 mm). The mu TBS was then measured. Data were analyzed with two-way analysis of variance, followed by a posthoc test. The interfacial morphology of the bonded space was evaluated using scanning electron microscopy. Results: In the control group, a significant difference was observed only for the mTBS of the composite (P < 0.05). Compared with the control groups, Metapex and zinc-oxide eugenol significantly reduced the mu TBS of restorative systems (P < 0.05). Conclusion: Composite materials seemed to bond to pulp chamber dentin in primary teeth with a higher strength than compomer and resin-modified glass ionomer. Metapex and zincoxide eugenol canal filling materials reduced the bond strength of all three restorative systems. (C) 2017 Association for Dental Sciences of the Republic of China. Publishing services by Elsevier B.V.Öğe Effect of storage duration/solution on microshear bond strength of composite to enamel(JAPANESE SOC DENTAL MATERIALS DEVICES, 2007) Tosun, Gul; Sener, Yagmur; Sengun, AbdulkadirThe aim of this study was to determine the effect of three storage solutions and two storage durations on microshear bond strength (mu SBS) of a resin composite. Sixty non-carious human permanent molars were stored in three storage solutions (0.1% thymol, 10% formalin, and distilled water). Each tooth was separated mesio-distally into two parts. Specimens of the first part were stored for 24 hours, while specimens of the second part were stored for two months in the solutions. After each storage period, the enamel surface was covered with a composite resin in combination with an etch-rinse adhesive system. Specimens were then serially sectioned into sticks of I mm(2) bond area and subjected to mu SBS test. There were no statistically significant differences between the two storage periods for each solution (p > 0.05). The thymol solution group showed lower mu SBS values than those of distilled water for both storage periods (p < 0.05). As for the formalin group, its mu SBS values were not statistically different from those of distilled water and thymol groups at each storage period (p > 0.05). In conclusion, the thymol solution caused the mu SBS of the resin composite to decrease when compared to both formalin and distilled water after 24 hours and two months. However, the mu SBS of the resin composite was not affected by storage duration.Öğe Effects of different accelerators on the setting time and physo-chemical properties of mineral trioxide aggregate(BIOINTERFACE RESEARCH APPLIED CHEMISTRY, 2016) Altan, Halenur; Tosun, Gul; Kus, MahmutThis study aimed to evaluate the effects of different accelarators added to Mineral Trioxide Aggregate (MTA) liquid on the final setting time, push-out bond strength as well as the physicochemical properties of MTA using SEM analysis.Öğe Effects of Er:YAG Laser on Bond Strength of Self-etching Adhesives to Caries-Affected Dentin(WILEY-BLACKWELL, 2014) Koyuturk, Alp Erdin; Ozmen, Bilal; Cortcu, Murat; Tokay, Ugur; Tosun, Gul; Sari, Mustafa ErhanThe erbium:yttrium-aluminum-garnet (Er:YAG) laser may be effective the bond strength of adhesive systems on dentine surfaces, the chemical composition and aggressiveness of adhesive systems in clinical practice. The purpose of this study was to evaluate the effects of the Er:YAG laser system with the bonding ability of two different self-etching adhesives to caries-affected dentine in primary molars. Ninety mid-coronal flat dentine surfaces obtained from sound and caries-affected human primary dentine were treated with an Er:YAG laser or a bur. The prepared surfaces were restored with an adhesive system (Xeno V; Clearfil S-3) and a compomer (Dyract Extra). The restored teeth were sectioned with a low-speed saw and 162 samples were obtained. The bond strength of the adhesive systems was tested using the micro-tensile test method. The data were statistically analyzed. A restored tooth in each group was processed for scanning electron microscopy evaluation. The values of the highest bond strength were obtained from the Clearfil S-3-Er:YAG laser-sound dentine group in all groups. (24.57 +/- 7.27 MPa) (P>0.05). The values of the lowest bond strength were obtained from the Xeno V-Er:YAG laser-sound dentine group in all groups (11.01 +/- 3.89 MPa). It was determined that the Clearfil S-3 increased the bond strength on the surface applied with Er:YAG laser according to the Xeno V. Microsc. Res. Tech. 77:282-288, 2014. (c) 2014 Wiley Periodicals, Inc.Öğe Idiopathic Juvenile Osteoporosis: A Case Report(PREMCHAND SHANTIDEVI RESEARCH FOUNDATION, 2015) Altan, Halenur; Tosun, Gul; Sen, YasarIdiopathic Juvenile Osteoporosis (IJO) is a very rare disease, self restrictive and shows marked, spontaneous improvement during adolescence. The major clinical features were pain with difficulty walking, growth retardation, oral and dental abnormalities with radiographically porous bone structure. A 13-year-old male referred to paediatric dentistry clinic for toothache. The observations made with extra-intraoral clinic examination that one revealed short and skinny stature, diffuse caries in deciduous teeth, abraded lower incisor, deep bite and dysmorphic appearance in permanent incisor. This report emphasizes the recognized features of IJO as well as describes facio-dental findings that could aid in the diagnosis and management of these patients.Öğe Intrapulpal Thermal Changes during Setting Reaction of Glass Carbomer (R) Using Thermocure Lamp(HINDAWI PUBLISHING CORP, 2016) Kahvecioglu, Firdevs; Tosun, Gul; Ulker, Hayriye EsraObjectives. Tomeasure the temperature increase induced during thermocure lamp setting reaction of glass carbomer and to compare it with those induced by visible light curing of a resin-modified glass ionomer and a polyacid-modified composite resin in primary and permanent teeth. Materials and Methods. Nonretentive class I cavities were prepared in extracted primary and permanent molars. Glass carbomer (GC) was placed in the cavity and set at 60 degrees C for 60 sn using a special thermocure lamp. Resin-modified glass ionomer (RMGIC) and polyacid-modified composite resin (PMCR) were placed in the cavities and polymerized with an LED curing unit. Temperature increases during setting reactions were measured with a J-type thermocouple wire connected to a data logger. Data were examined using two-way analysis of variance and Tukey's honestly significant difference tests. Results. The use of GC resulted in temperature changes of 5.17 +/- 0.92 degrees C and 5.32 +/- 0.90 degrees C in primary and permanent teeth, respectively (p > 0.05). Temperature increases were greatest in the GC group, differing significantly fromthose in the PMCR group (p < 0.05). Conclusion. Temperature increases during polymerization and setting reactions of the materials were below the critical value in all groups. No difference was observed between primary and permanent teeth, regardless of the material used.Öğe Periostitis Ossificans Managed with Endodontic Treatment(AMER SOC DENTISTRY CHILD, 2015) Kucukyilmaz, Ebru; Sener, Yagmur; Tosun, Gul; Savas, SelcukPeriostitis ossificans (PO) is a specific type of chronic osteomyelitis. Radiographically, it is characterized by the presence of lamellae of newly formed periosteal bone outside the cortex, giving the characteristic appearance of "onion skin." The most common cause of PO is periapical infection of the mandibular permanent first molar, which occurs primarily in children and young adults. Treatment in these cases is directed toward eliminating the source of the infection, either by extraction of the offending tooth or endodontic therapy. The purpose of this paper is to present a case of PO involving a permanent mandibular first molar managed with endodontic treatment.Öğe THE SETTING MECHANISM OF MINERAL TRIOXIDE AGGREGATE(ISTANBUL UNIV PRESS, ISTANBUL UNIV RECTORATE, 2016) Altan, Halenur; Tosun, GulMineral trioxide aggregate (MTA) is a powder containing calcium silicate composed of hydrophilic particles which harden at the presence of moisture. MTA was initially introduced as a root end filling material. Due its practical advantages that include superior biocompatility, effective sealing capability, and the ability to improve regeneration of the pulp and peripheral root tissues, it is used in different clinical applications such as pulp capping, apexification, pulpotomy and perforation. Despite being a promising material in endodontic treatment, MTA is not commonly used. Long setting time is the main clinical disadvantage of MTA. The aim of this review is to provide an overview of the current literature concerning the setting mechanism of MTA, accelerators and devices used to evaluate various steps of the hardening process.Öğe Temperature rise under normal and caries-affected primary tooth dentin disks during polymerization of adhesives and resin-containing dental materials(JAPANESE SOC DENTAL MATERIALS DEVICES, 2008) Tosun, Gul; Usumez, Aslihan; Yondem, Isa; Sener, YagmurThe purpose of this study was to compare the temperature rise under normal and caries-affected primary tooth dentin during photopolymerization of two adhesives and resin-containing restorative materials. Caries-affected and normal dentin disks were prepared from extracted primary molars with only mesial or distal approximal caries (4 mm in diameter, 1 mm in height). Temperature rise during photopolymerization of adhesive materials was measured with a J-type thermocouple wire that was connected to a data logger. Data were analyzed with two-way ANOVA and independent samples t-test. Temperature rise under caries-affected primary tooth dentin disks was higher than that of normal primary tooth dentin disks during polymerization of both adhesive systems and resin-containing dental materials (p<0.05). It was found that adhesive systems induced a higher temperature rise during polymerization as compared to the resin-containing restorative materials (p<0.05). In particular, temperature rise during polymerization of adhesive materials exceeded 5.5 degrees C under caries-affected primary tooth dentin.
