İstanbul Medeniyet Üniversitesi Kurumsal Akademik Arşivi
DSpace@Medeniyet, İstanbul Medeniyet Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve üniversite adresli yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Accuracy of Micro Hole Negotiator and Other Techniques for Detecting MB2 Canals in Maxillary Molar Retreatment: A Prospective Cohort Study
(Wiley, 2026) Adıgüzel, Mehmet; Özeken, Furkan; Çapar, İsmail Davut; Arslan, Hakan; Dummer, Paul Michael Howell
This clinical study evaluated four diagnostic approaches for locating the orifice of the second mesiobuccal canal (MB2) during root canal retreatment of maxillary molars: direct visual inspection, the Micro Hole Negotiator electronic device, the dental operating microscope, and their combined use. A stepwise protocol was used in 124 retreatment cases, applying each method sequentially. Detection rates of MB2 canals increased progressively, with the combined use of the microscope and electronic device yielding the highest adjusted diagnostic efficiency, followed by the microscope alone, the electronic device alone, and direct visual inspection. These findings suggest that optical magnification and impedance-based electronic feedback can enhance canal identification, particularly under complex retreatment conditions. The electronic device outperformed direct visual inspection and may enhance the detection of MB2 canals in clinical settings where a microscope is unavailable. © 2025 Australian Society of Endodontology Inc.
On the Astrolabe
(Cambridge University Press, 2026) Arslan, Taha Yasin
Arslan, T. Y. (2026). Pseudo-Māshā’allāh, On the Astrolabe. The British Journal for the History of Science, 59(1), 172–173.
Cross-domain One-shot Video Object Detection
(IEEE, 2025) Hanoğlu, Yusuf Kağan; Günsel, Bilge; Gürkan, Filiz
One-shot-object detection (OSOD) aims to detect novel object classes using a single example of an unseen class. Cross-domain OSOD is a more challenging problem since the seen and unseen objects are sampled from the entirely disjoint datasets. The majority of the existing CD-OSOD methods focus on image datasets where the video domain remains largely unaddressed. To tackle this problem, we introduce a one-shot cross-domain video object detection (CD-OSVOD) model enabling adaptation from the still image to the video. Specifically the novel target object is designated as the query shot and a target driven cross-domain finetuning (FT) scheme is integrated with a baseline object detector. To address the requirements of the long term video object detection, the FT scheme is augmented with a novel Online Target Update (OTU) mechanism, enabling the detector to handle challenges such as appearance changes and occlusions. The OTU is controlled by a temporal aggregation module (TAM) which leverages temporal information in video and triggers update of the one-shot query when the temporal consistency is disrupted. The proposed CD-OSVOD utilizes base models trained on COCO and VOC still image datasets and successfully adapts to the video domain for novel object classes. Performance evaluations on challenging VOT-LT benchmarking video dataset demonstrate significant improvement in AP50 and mAP scores, highlighting the effectiveness of the proposed domain adaptation approach.
Medial plating versus newly designed intramedullary nail with distal interlocking system for distal tibia fractures: A biomechanical study with finite element analysis
(Turkish Joint Diseases Foundation, 2026) Ünal, Ömer Kays; Dağtas, Mirza Zafer; Najafov, Turan; Demir, Cihan; Ugutmen, Ender; Akpinar, Fuat
Objectives
The aim of this study was to compare the biomechanical properties of a newly designed Tibial Intramedullary Nail-Distal Supportive Bolt Locking Screw (TIN-DSBLS) and medial anatomical plate in distal tibia fracture models using finite element analysis (FEA).
Materials and methods
Twelve medium-size, fourth-generation composite tibia models were used for testing. Models were divided into two groups as plate and nail group. A standardized osteotomy was made through each model. In the plate group, osteotomized models were fixed with distal tibia medial anatomic plate. Models in nail group were fixed with new design intramedullary nail with distal Bolt screw locking. All bone models were tested by an axial loading test machine to measure the force, maximum force, fracture site displacement and Stiffness. The second step of this study was FEA of the two models.
Results
The results of axial loading test results of two groups revealed that for distal tibia fracture, tibia nail which was locked with newly designed bolt screw showed superiority against plate-screw fixation about force (1597.76 ± 85.54 vs. 830.74 ± 146.7 N), maximum force (3617.6 vs. 1512.42 N), fracture site displacement (4.89 ± 1 vs. 7.85 ± 0.5 mm) and stiffness (357.88 ± 52.6 vs. 109.67 ± 13.6 N/mm). In FEA, maximum stress levels in implants were 1.7 time higher in nail group, bones were not exposed to higher levels of stress or deformation as in plate group. Maximum stress levels in bones of the nail group were 2.75 times lower than plate group. Total displacement in the plate group was more than two-fold compared to the nail group.
Conclusion
Our study results showed that the TIN-DSBLS provides more load transfer from the nail to the cortex in tibia distal metaphyseal fractures compared to traditional nails. Taken together, it is biomechanically superior to plate-screw fixation in fractures extending up to 2.5 cm proximal to the ankle joint.
Descriptive and Clinical Characteristics of Non-Survivors in a Tertiary Pediatric Intensive Care Unit in Turkey: 6 Years of Experience
(Necmettin Erbakan University NEU Press, 2025) Karakaya, Zeynep; Boyraz, Merve; Köksal Atış, Şeyma; Yüce, Servet; Duyu, Muhterem
Objectives: To identify the characteristics of non-survivors in a pediatric intensive care unit (PICU) in Turkey. Methods: This is a retrospective analysis of patients who died in a tertiary PICU over a 6year period from 2016 to 2021. Data were drawn from electronic medical records and resuscitation notes. Mode of death was categorized as failed cardiopulmonary resuscitation (F-CPR) or brain death (BD). Results: Among the 161 deaths, 136 non-survivors were included and 30.1% were younger than 1 year old. Severe pneumonia, respiratory failure and ARDS (31.6%) were the most common primary diagnoses. The most common mode of death was F-CPR (86.8%). More than half of the subjects had been admitted from pediatric emergency departments (58.1%), and more than half (53.7%) had died within 7 days in the PICU. Patients admitted from pediatric emergency departments had the lowest frequency of comorbidities (p<0.001). Severe pneumonia, respiratory failure and acute respiratory distress syndrome diagnoses were significantly more frequent in those who died after 7 days (p<0.001); whereas, septicemia, shock and multiple organ dysfunction were more common among those who died within the first day of PICU admission (p<0.001). Conclusions: It may be important to note that patients referred from wards are highly likely to have comorbidities, while those referred from pediatric emergency departments may be relatively younger. Additionally, patients with septicemia, shock or multiple organ dysfunction were more likely to die earlier (within 7 days), especially compared to those with severe pneumonia, respiratory failure or acute respiratory distress.
