İstanbul Galata Üniversitesi Kurumsal Akademik Arşivi
DSpace@Galata, İstanbul Galata 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 telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Analysis of Orthodontic Treatment Requirements and Their Influence on Quality of Life and Self-Esteem Among Adults
(Galenos, 2026) Zeynep, Aslihan; Öz, Abdullah Alper; Özaydın, Özge
Objective: To evaluate the the association of orthodontic treatment need on oral health-related quality of life (OHRQoL) and self-esteem in adult patients seeking orthodontic care. Methods: A total of 110 adults were recruited for the study. Orthodontic treatment need was evaluated using the index of complexity, outcome and need (ICON). Patients with a score of 43 and above were classified as Group 1; those with a score below 43 were classified as Group 2. Oral health-related quality of life was evaluated using the Oral Health Impact Profile-14 (OHIP-14), and self-esteem was assessed using the rosenberg self-esteem scale (RSES). Statistical evaluation involved Spearman's rank correlation, Mann-Whitney U tests, and independent samples t-tests. Results:The mean OHIP-14 score was higher in Group 1 (12.63 +/- 7.46) than in Group 2 (10.61 +/- 7.46). However, this difference was not statistically significant (p=0.176). Mean RSES scores did not differ significantly between the groups (p=0.741). A slight but meaningful positive correlation emerged between ICON and OHIP-14 scores, indicating that as orthodontic treatment need increased, OHRQoL tended to decrease. No significant correlation was observed between ICON and RSES. Additionally, gender was not significantly associated with either OHIP-14 or RSES scores. Conclusion:The analysis revealed that increased need for orthodontic treatment is associated with a slight worsening of OHRQoL but does not significantly affect self-esteem in adult subjects.
Effect of Solvent Use on Dentinal Integrity and Filling Removal During Endodontic Retreatment: A Micro-Computed Tomography Study
(2026) Zümrütel, Pelin; Haznedaroğlu, Faruk; Keleş, Ali; Basmacı, Gülsüm Kutlu
Introduction: This study evaluated, using micro-computed tomography (micro-CT), whether solvent use during endodontic retreatment influences dentinal defect formation and the removal of filling material compared with mechanical retreatment alone. Materials and methods: Twenty extracted human mandibular molars were prepared and obturated using standardized protocols and randomly allocated to solvent-assisted retreatment or retreatment without solvent (n=10 per group). Micro-CT scans were obtained before treatment, after obturation, and after retreatment at a voxel size of 13.68 μm. Dentinal defects were assessed using axial images, and residual filling-material volume was measured three-dimensionally in the apical, middle, and coronal thirds. Between-group comparisons were performed using the Welch independent-samples t-test or Mann-Whitney U test, as appropriate. Within-group comparisons were performed using the Friedman test. Results: No dentinal defects were detected in any specimen (0/20). However, the exact 95% confidence interval indicated that a low-incidence effect could not be excluded. Residual filling material was detected in all canals after retreatment. No significant differences were observed between the solvent-assisted and non-solvent groups in residual filling-material volume at any canal third after adjustment for multiple comparisons (all adjusted P>0.05). Conclusions: Under the conditions of this in vitro study, solvent use did not significantly improve filling-material removal compared with mechanical retreatment alone. No dentinal defects were detected in either group; however, the exploratory nature and limited sample size of the dentinal-defect analysis preclude excluding a low-incidence effect.
Barodontalgia and Flight Safety: A Critical Narrative Review of Pressure Physiology, Acute Pain, and Human Factors
(İstanbul University Press, 2026) Gürler, Esra Bihter
Barodontalgia is dental or orofacial pain brought on by a change in barometric pressure, and it usually points to an underlying dental or maxillofacial problem rather than standing as a disease on its own. This narrative review looks at the condition through five lenses: pressure physiology, clinical presentation, epidemiology, occupational stress, and human factors relevant to flight safety. A literature search was conducted using PubMed/MEDLINE, Web of Science, Scopus, Google Scholar, and DergiPark between 22 April and 7 June 2026. One systematic review covering 4,894 aircrew members and divers reported an overall experience rate of 8.2%, with divers at 9.8% and aircrew at 5.8%. Divers may be more exposed simply because pressure changes more rapidly over a short vertical distance underwater and because descent-ascent cycles occur more often, though differences in study design across the diving and aviation literature make a direct comparison difficult. A Turkish pilot survey found that 81% of those who had experienced barodontalgia placed the pain below 2,000 ft. That is a striking figure, but it comes from self-report: it points to a plausible overlap with low-altitude, pressure-changing flight segments without actually confirming the flight phase or an operational safety effect. Bruxism, occupational stress, and barodontalgia appear together in the literature, but the association is observational and says nothing about causality. General pain research backs the idea that pain can pull attention away from a task, yet no study has measured pilot performance during an actual barodontalgia episode. Taken as a whole, the evidence makes barodontalgia a biologically credible and operationally worth-watching problem, potentially preventable in principle, even if its real performance cost has not yet been quantified
Honoring Paris Pişmiş' Legacy: Uniform Astrophysical Properties of 14 Understudied Clusters from Gaia DR3
(IOP Publishing, 2026) Koç, Seliz; Akbaba, Furkan; Plevne, Olcay; Alan, Neslihan
Open clusters are fundamental tracers of the chemical and dynamical evolution of the Galactic disc. This study presents a systematic characterisation of 14 understudied open clusters from the Pismis catalog, selected as those for which the Gaia DR3 data support a well-defined stellar sequence, and spanning a wide range of ages and distances. Utilizing high-precision Gaia DR3 data, we aim to provide a high-fidelity modernisation of these historical discoveries while testing the consistency of our analytical framework across diverse stellar populations. Membership probabilities were determined via the unsupervised UPMASK algorithm using Gaia DR3 astrometric data (positions, proper motions, and parallax). To ensure high sample purity, the member samples entering the isochrone fits were restricted to P >= 0.90, with all subsequent astrophysical parameters calculated through membership-weighted likelihoods. Fundamental properties-including age, distance, reddening, and metallicity-were derived using a Bayesian Nested Sampling approach to isochrone fitting, a methodology chosen for its robustness in navigating the parameter degeneracies typical of dense Galactic fields. The 14 systems exhibit a broad distribution of properties, with ages ranging approximately 11 Myr to 1.5 Gyr and distances spanning approximately 690 to 5445 pc. These refined and uniform parameters reconcile historical observations with the precision era of modern astrophysics, providing an internally homogeneous baseline for systems that large-scale automated surveys recover only partially. A direct cross-match against widely used automated catalogs shows that they typically contain only about a third of the members identified here, and substantially less in the most crowded fields, underscoring the value of cluster-specific analysis. This work contributes to a more complete census of the Galactic disc and sets out a reproducible, per-cluster reliability assessment that can be applied to the many comparable low-latitude systems that remain to be characterised.
Illuminant-dependent color inconstancy and metameric behavior of anodized titanium through silicone-based gingival simulation layers of varying thickness
(Springer, 2026) Çopuroğlu, Akanay; Davut, Umur; Doğanay Özyılmaz, Özge; Özyılmaz, Özgün Yusuf
This in vitro study evaluated how gingival thickness and anodization color affect color perception of Grade V titanium discs under different light sources. Ninety-six titanium discs were anodized yellow, pink, or purple, or left non-anodized. Silicone gingival masks of 1 mm and 2 mm simulated soft tissue. A single spectral reflectance measurement was recorded for each specimen using a benchtop spectrophotometer, from which color coordinates under five standardized illuminants (D65, D50, A, F2, F11) were computationally derived. Color differences (ΔE₀₀) were calculated using the CIEDE2000 formula to evaluate color inconstancy, and metamerism was quantified using a CIEDE2000-based metamerism index (MI), the mean absolute difference between ΔE₀₀ under the test illuminants (D50, A, F2, F11) and D65. Data were analyzed with one-way ANOVA, Tukey HSD post hoc tests, and independent t-tests (α=0.05). All anodized colors at 1 mm exceeded the CIEDE2000 clinical acceptability threshold (ΔE₀₀ >1.8), with purple showing the highest inconstancy, particularly under fluorescent lighting (P<.05). Increasing thickness to 2 mm significantly reduced ΔE₀₀ across all groups (P<.05), although values remained above the acceptability threshold in every group, with purple showing the greatest relative stability under all illuminants. Metameric behavior remained imperceptible under most conditions, except for pink at 1 mm under F2. Thickness and lighting significantly affect color stability of anodized titanium, although the effect of illuminant type was color-dependent: fluorescent (F2) illumination increased color inconstancy for purple and, at 2 mm, yellow, whereas pink showed the opposite pattern, with its lowest ΔE₀₀ values occurring under F2 rather than D65 at both thicknesses. Thinner tissue intensifies color shifts, while≥2 mm thickness improves consistency. Pink performs better in thin tissue; purple shows greatest stability with thicker coverage. Metamerism was imperceptible under most conditions, except for pink at 1 mm under F2, which reached a perceptible but clinically acceptable level.
