İstanbul Sağlık ve Teknoloji Üniversitesi Kurumsal Akademik Arşivi
DSpace@İSTÜN, Üniversite mensupları 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 telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Evaluation of mesiodistal tip accuracy in mandibular anterior teeth following incisor extraction with clear aligners
(Elsevier, 2025) Erdem, Buket; Özcan, Mustafa; Şar, Çağla
Introduction: Single mandibular incisor extraction is sometimes necessary in clear aligner treatment, yet the accuracy of mesiodis tal tooth positioning in such cases remains unclear. This retro spective study evaluates the discrepancy between predicted and achieved mesiodistal movements of the remaining mandibular an terior teeth in Invisalign (Align Technology, Santa Clara, CA) treat ments. Additionally, it examines the effects of aligner attachments and change frequency on movement accuracy. Material and Methods: A total of 40 Invisalign patients with single mandibular incisor extraction were retrospectively analyzed. Geomagic Control X (3D Systems, Rock Hill, SC) was used to mea sure pretreatment positions, predicted movements, and achieved outcomes. Predicted and actual mesiodistal tip movements were compared. Results: Regression analysis revealed significant discrepancies (P < 0.001) between predicted and achieved mesiodistal movements for both incisors and canines. Only 70% of the predicted incisor tip movement (R² = 0.4171) and 60% of the predicted canine tip move ment (R² = 0.5789) were achieved. Neither the number of aligners, change protocol (1-week vs. 2-week), nor attachments significantly affected accuracy (P > 0.05). However, incisors were less likely than canines to follow the predicted movement direction (P = 0.025). Conclusion: A significant discrepancy exists between predicted and achieved mesiodistal movements after single mandibular in cisor extraction with Invisalign. The number of aligners, wear dura tion, and attachments do not significantly influence accuracy. Fur ther research is needed to optimize treatment planning and im prove predictability in clear aligner therapy.
Examination of sleep disturbances in parkinson’s disease and other movement disorders
(Elsevier, 2025) Diaconu, Stefania; Murasan, Iulia; Değirmenci, Yıldız; Falup-Pecurariu, Cristian; Bhidayasiri, Roongroj; Falup-Pecurariu, Cristian
From Bedside to Diagnosis: Practical Competencies in Movement Disorders, Volume 10 in the International Review of Movement Disorders, highlights new advances in the field, with this new volume presenting interesting chapters on important topics such as Movement Disorder Examination: Hypokinetic Disorders, Clinical Approach to Abnormal Facial Movements, Advancing Movement Disorder Education: From Courses to Curriculum, Movement Disorder Examination: Hyperkinetic Disorders.
Taxonomic description and phylogenetic placement of a new xanthogalum species (Apiaceae) from Turkey
(Taylor & Francis, 2025) Tuncay, Hüseyin Onur; Ekici, Miraç; Uzun, Fatma Selin; Lyskov, Dmitry; Akalın, Emine
The genus Xanthogalum, represented by the species X. purpurascens and X. turcicum in Turkey, forms a small but taxonomically significant group characterized by decurrent leaves and large fruits with broad, undulate wings. During extensive field surveys (2020–2025) in northeastern Turkey, a distinctive population was discovered exhibiting a combination of morphological characters not found in any previously described Turkish species. Xanthogalum ozlemiae Tuncay & Akalın sp. nov. is described herein based on comprehensive morphological, anatomical, and molecular evidence. The new species is distinguished from its Turkish congeners by white petals with brownish lines (vs. yellow to yellow – green), densely hairy rays and pedicels, shorter pedicels (0.5–2.5 mm), amphisto matic leaves with sparse hairs restricted to upper surface veins, and distinctly unequal mericarps with markedly different wing widths (1.9–3.5 mm vs. 0.5–1 mm). Phylogenetic analyses based on ITS sequences support its placement within Xanthogalum and indicate close affinity with a white – petaled lineage. A detailed morphological description, anatomical characterization, comparisons with related species, an identification key, and a preliminary conservation assessment are provided. Given its extremely restricted distribution and ongoing habitat threats from tourism development, the species is assessed as Endangered (EN) under IUCN criteria.
SFNN: A secure and diverse recommender system through graph neural network and regularized variational autoencoder
(Elsevier, 2025) Bahi, Abderaouf; Gasmi, Ibtissem; Bentrad, Sassi; Azizi, Mohamed Walid; Khantouchi, Ramzi; Uzun-Per, Meryem
Recommender systems are frequently improved to filter information and provide users with the most relevant items. However, they face limitations in balancing appropriate and diverse recommendations while ensuring the security and integrity of user data. A new recommender system based on secure fusion neural network is pre sented in this paper. It guarantees data integrity and confidentiality while balancing accuracy and diversity. It integrates a graph neural network that models user-item interactions to improve accuracy, with a regularized variational autoencoder whose evidence lower bound loss function is enhanced by a diversity-promoting regu larization term that favors latent-space dispersion, thereby improving recommendation diversity. To optimize the combination of the two neural networks scores, an adaptive fusion mechanism is introduced to generate final predictions that consider diverse user preferences while maintaining relevance. Furthermore, our approach uses blockchain technology to encrypt and secure data storage, ensuring the integrity and confidentiality of users’ data. The experiments conducted on three datasets show that the proposed model can achieve an accuracy of 78.13 % with an intra-list diversity of 46.82 % for Retail Rocket dataset, an accuracy of 82.44 % with an intra-list diversity of 37.78 % for clothing dataset, and an accuracy of 86.16 % with an intra-list diversity of 47.65 % for MovieLens-1 M dataset.
Impact of lightness differences in digitally simulated composite resin restorations on perceived smile attractiveness
(Wiley, 2025) Ntovas, Panagiotis; Ünal, Tuna; Korkut, Bora; Ferraris, Federico; Fehmer, Vincent; Sailer, Irena
Objectives: To investigate the effect of lightness differences between digitally simulated composite restorations and anterior maxillary teeth, in combination with restoration type, and clinical experience on perceived smile attractiveness. Materials and Methods: An imaging software program (Adobe Photoshop CC 2023) was used to digitally manipulate a frontal full-face portrait of a smiling female model, to create five types of moderate-sized composite resin restorations of moderate size. For each restoration 14 lightness differences were simulated. The image was digitally modified to simulate five different types of composite resin restorations (Class III, Class IV, Class V, diastema closure (bilateral and unilateral approach)). Each restoration was adjusted through 7 incremental increases and 7 incremental decreases of 1 unit in lightness (L* value), yielding a total of 70 images. The smile attractiveness of each picture was rated by 80 dentists and 80 laypersons, ranged from 21 to 77years using a visual analog scale. The Wilcoxon signed-rank test was employed to assess whether the mean of a sample significantly differed from the control (p<0.05). Results: Among the different restoration types, crown fracture repairs (Class IV) had the greatest negative impact, followed by proximal restorations (Class III), diastema closures (Bilateral approach), diastema closures (Unilateral approach), and, lastly, cervical restorations (Class V), which had the least impact on perceived smile attractiveness (p≤0.05). The influence of lightness differences, whether toward a darker or lighter restoration, was dependent on both the type of restoration and the observer's experience. Conclusions: The effect of lightness difference on perceived smile attractiveness was significantly influenced by both the type of composite resin restoration and the observer's experience. Dental professionals perceived lightness discrepancies as less attrac tive compared to laypersons, suggesting that experience plays a key role in the perception of esthetic outcomes. Clinical Significance: The repositioning of an esthetic direct dental restoration is highly influenced by the dentist's chromatic perception which is more sensitive than that of a layperson who evaluates its matching with the natural tooth. The findings of the present study can support evidence-based clinical decision-making.
