Bildiri Koleksiyonu
https://hdl.handle.net/20.500.12511/4164
Proceeding Collection2024-03-29T02:15:41ZDiffusion-based hierarchical multi-label object detection to analyze panoramic dental X-rays
https://hdl.handle.net/20.500.12511/11718
Diffusion-based hierarchical multi-label object detection to analyze panoramic dental X-rays
Hamamcı, İbrahim Ethem; Er, Sezgin; Simsar, Enis; Sekuboyina, Anjany; Gündoğar, Mustafa; Stadlinger, Bernd; Mehl, Albert; Menze, Bjoern
Due to the necessity for precise treatment planning, the use of panoramic X-rays to identify different dental diseases has tremendously increased. Although numerous ML models have been developed for the interpretation of panoramic X-rays, there has not been an end-to-end model developed that can identify problematic teeth with dental enumeration and associated diagnoses at the same time. To develop such a model, we structure the three distinct types of annotated data hierarchically following the FDI system, the first labeled with only quadrant, the second labeled with quadrant-enumeration, and the third fully labeled with quadrant-enumeration-diagnosis. To learn from all three hierarchies jointly, we introduce a novel diffusion-based hierarchical multi-label object detection framework by adapting a diffusion-based method that formulates object detection as a denoising diffusion process from noisy boxes to object boxes. Specifically, to take advantage of the hierarchically annotated data, our method utilizes a novel noisy box manipulation technique by adapting the denoising process in the diffusion network with the inference from the previously trained model in hierarchical order. We also utilize a multi-label object detection method to learn efficiently from partial annotations and to give all the needed information about each abnormal tooth for treatment planning. Experimental results show that our method significantly outperforms state-of-the-art object detection methods, including RetinaNet, Faster R-CNN, DETR, and DiffusionDet for the analysis of panoramic X-rays, demonstrating the great potential of our method for hierarchically and partially annotated datasets. The code and the datasets are available at https://github.com/ibrahimethemhamamci/HierarchicalDet.
2023-01-01T00:00:00ZBrand equity in digital marketing: What does it mean in the health sector and how does it affect consumer decisions?
https://hdl.handle.net/20.500.12511/11443
Brand equity in digital marketing: What does it mean in the health sector and how does it affect consumer decisions?
Başal, Murat; Şarkbay, Ömer Faruk; Kılıçaslan, Alaaddin
Businesses are trying to achieve efficiency in marketing by using digital channels consisting of internet, social media and mobile platforms. The increase to be seen in the annual turnover of an enterprise, as well as the awareness of the brand, the interaction with the customers shows the brand equity. In other words, tangible and intangible assets are also related to brand equity. Here, the power of influence in the market, the customer's perception of value and brand loyalty are seen as factors affecting the situation. As a general concept, the health sector is the formation that deals with individuals and organizations that involve all phases from the production of health-related goods and services to consumption. It is formed by the decision of the consumer in the stages consisting of five steps taken up in the decision-making process of the consumer who needs a service or product. The aim of this study is to try to determine how consumers in the health sector have an effect on the decision-making process in order to understand the value that the consumer shows about a product or service about a business in digital marketing, which is the most important commercial shopping channel of today. In this direction, in order to obtain the necessary information about the field, data were collected from internet users in Istanbul using a Google form. These data were analyzed by applying t test and Anova test in SPSS system. As a result, a positive result has been reached as the effect of brand equity on consumer decision making in the health sector. It has been concluded that consumers give more importance to digital marketing channels and that this area should be more focused on in the health sector.
2023-01-01T00:00:00ZEvaluation of biodegradable fixation system for mandibular angulus fracture by using finite element method
https://hdl.handle.net/20.500.12511/854
Evaluation of biodegradable fixation system for mandibular angulus fracture by using finite element method
Ay, Mustafa; Hartomacıoğlu, Selim; Bakırcıoğlu, Barış; Yüzbaşıoğlu, H. Emir; Kubat, Thamer
To date many fixation techniques of mandibular angle fractures have been introduced. There exist much research on the stability of plate and screws systems used in Champy technique in fixation of mandibular fractures. However the need of a second surgery for the removal of these plates and screws, and well known disadvantages of metallic fixations have led to the development of resorbable materials. It is thought that in order to achieve a safe and effective post-operative stability, the use of resorbable plates and screws is preferred for fixation. In this study, fixation evaluation of biodegradable plates which have been commonly used in recent years, was investigated using finite element method. 3D model required to perform the finite element analysis was obtained from CT scanning images using reverse engineering methods and material properties of mandible were obtained by Hounsfield Unit method. Biodegradable fixation systems were applied to this model and FEA was performed. It is concluded that biodegradable plate screw system used in the treatment of mandibular angle fractures shows a sufficient stability under masticatory forces.
2016-01-01T00:00:00ZInvestigation of the genotoxic effect and trace element levels of the nickel-titanium arc-wires used in orthodontic treatment
https://hdl.handle.net/20.500.12511/3848
Investigation of the genotoxic effect and trace element levels of the nickel-titanium arc-wires used in orthodontic treatment
Erdem, Onur; Şimsek Çetinkaya, Şahika; Kaplan, M.; Çırak, Eyüp; Gökçe, Sıla Mermut; Akay, Cemal
Nickel-titanium alloy arch-wires are the most frequently used biomaterials thanks to their biocompatibility in orthodontic treatment. Despite these properties we have some evidence about carcinogenic, mutagenic and cytotoxic effects of the materials is associated with their corrosion properties. In this study, we aimed to investigate the genotoxic effects using Micronucleus (MN) technique in 32 patients (consisting of 16 boys and 16 girls whose ages range from 12 to 17) undergoing the Ni-Ti arc-wires treatment. Also, some bioelement (Fe, Cu and Zn) levels in saliva were determined for certain sampling times. The sampling time for patients is 0 (as control) 7th, 15th, 30th, 45th, 60th and 90th days. The mean MN frequency per 1000 cells has increased significantly in days 7, 15, 30 and 45 compared to the control group. However, there was not a significant difference between the 60th and the control group. In addition, the mean MN frequency in the 90th day was found to decrease significantly compared to the control group. Cu values in the saliva samples showed a statistically significant increase in all experimental groups compared to the control group, while there was a significant decrease in Fe and Zn values compared to the control group. Consequently, it has been determined that the genotoxic effects related to Ni-Ti alloy wire were at identifiable levels; however, these effects did not pose a problem in terms of the long-term biocompatibility of the materials.
52nd Congress of the European-Societies-of-Toxicology (EUROTOX) -- SEP 04-07, 2016 -- Seville, SPAIN; WOS: 000402436700891
2016-01-01T00:00:00Z