Ergin ULUSOY

Kitap Bölümü | 2021 | Türk Modernleşmesi: Nesneler ve Semboller , pp.181 - 211

Kitap Bölümü

Betül YILDIRIM

Bildiri | 2021 | 40. YÖNEYLEM ARAŞTIRMASI VE ENDÜSTRİ MÜHENDİSLİĞİ KONGRESİ , pp.1 - 1

Acil durumlarda hizmet verecek olan ambulans, itfaiye vb. acil servis araçları için konuşlandırma, yer değiştirme, gelen çağrılara atanma gibi çeşitli durumlar göz önüne alınarak, literatürde farklı amaçlar ve kısıtlar altında pek çok matematiksel model geliştirilmiştir. Bu problemlerde temel amaç, araçların olay yerine kısa sürede ulaşmasını sağlayacak şekilde istasyonlara veya merkezlere konuşlandırılmasıdır. Her bölgenin güvenli kapsanması için talep ettiği araç sayısı farklı olabileceğinden, acil servis araçlarının hizmet edeceği bölgelerin taleplerini karşılayacak şekilde konuşlandırılması gerektiği de göz ardı edilmemelidir. B . . .u çalışmada, acil servis araçlarından olan doğalgaz servis araçlarının, talep bölgelerinin güvenli kapsanma taleplerini karşılayacak şekilde konuşlandırılmasını sağlayan, araçlar arasında istasyon değişikliğine izin veren yer değiştirme tabanlı güvenli kapsama modeli geliştirilmiştir. Önerilen model sistemde müsait olan araç sayısına bağlı olarak bu araçların hangi istasyonlarda konuşlandırılacağına ve görevi biten araçların hangi istasyonlara döneceğine dair tablo sunmaktadır. Çalışmamızda aynı zamanda araçlar arası yer değiştirmeye izin vermeyen statik model de sunulmuştur. Önerilen her iki modelin performansları gerçek hayat verilerine dayanan bir veri seti kullanılarak, çeşitli ölçütler altında kıyaslanmış ve etkinlikleri ortaya konulmuştur Daha fazlası Daha az

Sinem SARGIN

Makale/Derleme | 2021 | İşletme Araştırmaları Dergisi13 ( 2 ) , pp.1764 - 1780

Purpose –The purpose of this research is to examine the impact of consumers’ levels of moral maturity on their unethical behavior.Design/methodology/approach –The research model of this study examines the effect of moral maturity on consumer ethics dimensions (“actively benefiting from an illegal situation” and “benefiting from actions perceived as harmless”). The universe of this descriptive research consists of consumers living in Turkey. The online survey method was applied to 457 consumers selected by convenience sampling method. While creating the questionnaire, moral maturity statements were prepared by using the scales develo . . .ped by Şengün and Kaya (2007), and the consumer ethics statements were prepared by the help of the scale developed by Muncy and Vitell (1992). The results have been analyzed with SPSS and AMOS statistics programs. Frequency analysis, reliability analysis, explanatory factor analysis, confirmatory factor analysis and structural equation model analyses have been used. Findings –The findings suggest that the level of moral maturity has a significant and negative effect on both unethical consumer behavior dimensions: “actively benefiting from an illegal situation” and “benefiting from actions perceived as harmless”. Discussion –Moral maturity refers to the assimilation of moral principles, the evaluation of moral rules by the conscience, and the realization of actions in this direction. People who have reached the level of moral maturity are expected to display ethical behaviors in the society in daily life. According to the findings of the research, as the moral maturity of the individual increases, the possibility of exhibiting unethical behavior decreases; as the moral maturity decreases, the possibility of unethical behavior increases. The results obtained show how effective the concept of morality on ethical consumer behavior is. Marketing managers should consider the moral maturity of consumers in order to understand their unethical behaviors. In this direction, activities (such as training, seminars,public spots, education for children) can be carried out to increase the level of moral maturity of consumers. Besides this, marketing managers can prevent unethical consumer behaviors by applying different marketing strategies (in the conclusion section,the recommendations are mentioned in detail) to consumers with low/high moral maturity level Daha fazlası Daha az

Özcan KARATAŞ | Nazire Nurdan ÇAKIR | Şaban Suat ÖZSARIYILDIZ | Cem Abdülkadir GÜRGAN

Makale/Derleme | 2021 | Quintessence International

Objective: The aim of this study was to examine the success of deep learning-based convolutional neural networks (CNN) in the detection and differentiation of amalgam, composite resin, and metal-ceramic restorations from bitewing and periapical radiographs. Method and materials: Five hundred and fifty bitewing and periapical radiographs were used. Eighty percent of the images were used for training, and 20% were left for testing. Twenty percent of the images allocated for training were then used for validation during learning. The image classification model was based on the application of CNN. The model used Resnet34 architecture, w . . .hich is pre-trained on the ImageNet dataset. Average sensitivity, receiver operating characteristic (ROC) curve, and area under the curve (AUC) were calculated for performance evaluation of the model. Results: The model training loss was 0.13, and the validation loss was 0.63. The independent test group result was 0.67. Amalgam AUC was 0.95, composite AUC was 0.95, and metal-ceramic AUC was 1.00. The average AUC was 0.97. The false positive rate in the validation set was 18, the false negative rate was 18, the true positive rate was 60, and the true negative rate was 138. The true positive rate was 0.82 for amalgam, 0.75 for composite, and 0.73 for metal-ceramic. Conclusion: Deep learning-based CNNs from periapical and bitewing radiographs appear to be a promising technique for the detection and differentiation of restorations. Keywords: artificial intelligence; dental restorations; digital radiology Daha fazlası Daha az

Ebru DELİKAN |

Makale/Derleme | 2021 | Clinical Oral Investigations

Purpose Postoperative pain following root canal treatment is a concern for pediatric patients and pediatric dentists. The purpose of this study was to evaluate the effect of using sonic activation (SA) on postoperative pain levels after root canal therapy of primary molars. Methods A total of 110 patients aged 5–9 years with symptomatic irreversible pulpitis involving primary molars were included in the study and were randomly divided into two groups according to agitation methods: SA and no sonic activation (NSA). Root canal treatments were completed, and the teeth were restored permanently. Postoperative pain levels were evaluated . . . using the five-face scale at 8, 24, 48, and 72 h and 1 week after treatment. Pain levels and frequency of analgesic intake were recorded and analyzed. Results Postoperative pain values were lower in the SA group than in the NSA group at 8, 24, and 48 h after treatment (p < 0.05). No significant difference was observed between the groups in terms of postoperative pain values at 72 h and 1 week after treatment (p > 0.05). Conclusions It was determined that the use of SA reduces postoperative pain level significantly after root canal treatment in primary molar teeth. Clinical relevance The use of SA can be recommended to clinicians since it is effective in the successful management of postoperative pain of root canal treatment in primary molar teeth Daha fazlası Daha az

Özcan KARATAŞ

Makale/Derleme | 2021 | J Oral Res Rev

Objective: The aim of this study was to investigate the degree of polymerization of composite resins cured with different light-curing units (LCUs). Materials and Methods: Three bulk-fill composite (Beautifil Bulk-Fill Giomer, Filtek Bulk-Fill, and X-Tra Fill) and a methacrylate-based composite (Filtek Z250) were used in this study. Thirty disc-shaped specimens, 4 mm thick, were prepared from each composite resin. Specimens were divided into three groups and polymerized with light-emitting diode (LED), Plasma arch curing unit (PAC), and quartz-tungsten halogen LCU. The bottom and top surface microhardness of the specimens stored in . . .distilled water for 24 h at 37°C after polymerization was measured with a universal test device. The hardness ratio (HR) of specimens was calculated by the bottom surface microhardness/top surface microhardness formula. Data were analyzed by two-way ANOVA and Tukey’s least significant difference post hoc tests (α = 0.05). Results: Statistically significant differences were detected between the mean HR values of the specimens polymerized with different LCUs (P < 0.05). The mean HR values of Beautifil Bulk-Fill Giomer specimens were found to be statistically significantly lower than other composites (P < 0.05). The mean HR values of the specimens polymerized with PAC LCU were found to be statistically significantly lower than other LCUs (P < 0.05). Conclusion: The degree of polymerization of the composite resin restoration may be affected by the structural properties of the resin and the type of LCU. The clinician may use alternative techniques, especially in deep cavities Daha fazlası Daha az

Özcan KARATAŞ

Makale/Derleme | 2021 | J Oral Res Rev

Aim: The aim of this in vitro study was to determine the effect of fiber-reinforcement on the color changes and degree of polymerization of two different composite resins. Materials and Methods: A bulk-fill composite resin and a methacrylate-based composite resin with A2 shade were used in this study. Three groups of specimens (control group with no reinforcements, polyethylene fiber-reinforced composite and glass fiber-reinforced composite groups) were prepared from each composite. The color change of the specimens with polymerization was measured. Then, to determine the degree of polymerization, the hardness ratios were calculated . . . by measuring the bottom and top surface hardness of all specimens. The data were analyzed by analysis of variance, Duncan’s multiple range tests, and Independent sample t-test. Results: Statistical analysis of variance presented the significance difference between composite and fiber for color change (P < 0.05). The highest color change by polymerization was seen in the polyethylene fiber-reinforced bulk-fill composite group. It was found that the addition of fiber to composite resins significantly reduced the degree of polymerization (P < 0.05). Conclusion: The addition of fiber may lead to color change and reduce the degree of polymerization of composite resins. The amount of change may differ depending on the structural properties of the composite resins and fiber Daha fazlası Daha az

Ebru DELİKAN | Bertan KESİM

Makale/Derleme | 2021 | Pediatric Dentistry

Purpose: Differences in the endodontic microbiome of permanent and primary teeth during the mixed dentition period are still unknown. The purpose of this study was to examine bacterial diversity in endodontically infected primary and permanent teeth using 16S rRNA gene sequencing and the QIIME 2 (Quantitative Insights Into Microbial Ecology 2) bioinformatics pipeline. Methods: Microbial samples from endodontically infected primary (n equals 15) and permanent (n equals 15) maxillary or mandibular molar teeth were subjected to next-generation sequencing analysis based on examination of the hypervariable V3 to V4 region of the 16S rRNA . . . gene. Statistical analysis was performed using R software. Results: Of 1,664,926 reads and 2,237 operational taxonomic units, 14 phyla, 89 families, and 236 genera were identified. Firmicutes were the most commonly detected phyla in both endodontically infected primary and permanent root canals. Bacteroides and Proteobacteria were more common in primary teeth, whereas Actinobacteria and Verrucomicrobia were more common in permanent teeth. The overall canal microbiota composition was similar in endodontically infected primary and permanent teeth (P=0.338). Conclusions: This study provides a comprehensive assessment of microbiota composition in endodontically infected primary and permanent teeth and gives a deeper insight into the origin of the root canal infections Daha fazlası Daha az

Özcan KARATAŞ | Cem Abdülkadir GÜRGAN

Bildiri | 2021 | Ankara Üniversitesi1. Uluslararası Diş Hekimliği Eğitimi Kongresi (DECON 21) , pp.36 - 37

Bildiri

Özcan KARATAŞ

Makale/Derleme | 2021 |

Makale/Derleme

Ebru DELİKAN

Makale/Derleme | 2021 | Odovtos-International Journal of Dental Sciences

Objective: This study investigated the effects of three types of mouthwash on the color stability of three resin-based restorative materials (nanohybrid resin composite, sonic-activated bulk-fill material, and compomer). Materials and Methods: To this end, 120 cylindrical disc specimens were prepared and polished, after which they were incubated in distilled water for 24 hours for post-polymerization. The baseline color values of each specimen were measured with a spectrophotometer, then the specimens were randomly divided into four groups. Following immersion in the mouthwashes for 24 hours, the specimens were rinsed with distilled . . . water and dried before the color measurement was repeated. The values of color change (ΔE₀₀) were subsequently calculated. A two-way analysis of variance and Duncan’s post hoc multiple comparison tests were conducted to determine statistically significant differences among the restorative materials. Results: All samples showed discoloration after immersion, albeit some instances of discoloration were imperceptible. In this respect, a statistically significant difference was found among the restorative materials and mouthwashes ( Daha fazlası Daha az

Ebru DELİKAN

Makale/Derleme | 2021 | Journal of Pediatric Research

Aim: Dentoalveolar injuries are complex conditions affecting teeth and surrounding tissues and are frequently seen in children or adolescents. The purpose of this study was to investigate the levels of knowledge on dental avulsion among emergency physicians (EPs). Materials and Methods: A questionnaire was used to investigate EPs’ level of knowledge and therapeutic approaches to avulsion. One hundred EPs were included in the study. The questionnaire was mailed to participants, and the data obtained were evaluated. Descriptive statistics and chi-square tests were used for statistical analysis. Results: Our results showed that althoug . . .h EPs frequently encountered dental traumas, their medical education had not included dental emergencies. The knowledge level of dental avulsion of all EPs included in the study was as follows; 24% low, 56% moderate and only 18% high. Conclusion: EPs possessed inadequate knowledge concerning the immediate treatment of dental avulsion. The treatment of avulsion should be included in the medical curriculum. This will result in appropriate emergency treatments in dental avulsion being provided in emergency settings Daha fazlası Daha az