Alt birimler

• Ağız, Diş ve Çene Cerrahisi Anabilim Dalı
• Ağız, Diş ve Çene Radyolojisi Anabilim Dalı
• Çocuk Diş Hekimliği Anabilim Dalı
• Endodonti Anabilim Dalı
• Ortodonti Anabilim Dalı
• Periodontoloji Anabilim Dalı
• Protetik Diş Tedavisi Anabilim Dalı
• Restoratif Diş Tedavisi Anabilim Dalı

Araştırmacılar(20)

• Akar, Türker
• Akın, Muhammet
• Akyuz, Mehmet
• Bayrakçeken, Merve
• Gömleksiz, Oğuzhan
• Gömleksiz, Seda
• Guller, Mustafa Taha
• Gülnahar, Evrem
• Gülnahar, Yakup
• Karaarslan, Ayşegül
• Karaca, Serhat
• Koseturk, Merve
• Ocak, Ali
• Okumus, Oemer Faruk
• Okumuş, Ömer Faruk
• Özkanoğlu, Seda
• Senocak, Tuba
• Taşkesen, Fatih
• Uzel, Melih Can
• Yeşil, Zeynep

• ArticleAçık Erişim2026/r/ebyu/19215
  Color Matching Ability Among Single-Shade Resin Composites: Instrumental and Visual Evaluation

  Gömleksiz, Seda

  Background: This study aimed to evaluate the color-matching ability of 4 single-shade resin composites (RCs), using 2 different evaluation methods. Methods: One hundred and twelve specimens (8 × 2 mm) were fabricated in disc shape using 4 single-shade RCs (Omnichroma (OM), Essentia Universal (EU), Zenchroma (ZC), and Charisma Diamond One (CDO)) (n = 28). The specimens were randomly divided into 4 subgroups (na = 7), and cylindrical cavities (4 × 1 mm) were prepared in the center of each specimen. The cavities were then restored with either the same material or one of the other single-shade RCs. Color matching was measured instrumentally using a spectrophotometer and visually using a 0-4 scoring scale. Data were recorded and statistically analyzed (P < .05). Results: When instrumental analysis results were evaluated, ΔE00 values above the clinically acceptable threshold were observed in all groups except the control groups. The highest ΔE00 value was seen in the OM-EU group (P < .05); OM showed the worst color matching. The best color matching was observed in CDO. When visual analysis results were examined, the highest visual scores were seen in the EU-OM and ZC-OM groups (P < .05), whereas CDO presented the lowest visual scores. Conclusion: Color-matching ability of single-shade RCs varies depending on the material composition. Single-shade RCs with higher translucency after polymerization and enhanced optical design may provide better color matching. Some color differences detected instrumentally may not always be visually perceptible under clinical conditions.

  RDL Kalıcı Kaydıİncele
• ArticleYayıncıda açık erişim2026/r/ebyu/11427
  Cuspal Deflection and Marginal Adaptation in Premolars Restored with Low-Shrinkage Resin Composites

  Gömleksiz, Seda

  Objectives The aim of this in vitro study was to evaluate cuspal deflection and marginal adaptation in premolars restored with conventional and low-shrinkage resin composites (RCs). Materials and Methods Fifty-six maxillary first premolars with standardized MOD cavities were randomly assigned to four groups (n ¼ 14): Clearfil Majesty Posterior (CMP), Charisma Diamond (CHD), Beautifil II LS (BL), and Filtek Z550 (FZ). Cuspal deflection was measured using a digital micrometer as the linear distance between two reference points at baseline, 5 minutes, and 24 hours after restoration. Deflection values were calculated relative to the baseline. Three samples per group were evaluated using scanning electron microscopy to assess marginal adaptation. Statistical Analysis Data were analyzed using IBM SPSS Statistics V23.0. Data distribution was evaluated using the Shapiro-Wilk test. Kruskal-Wallis and one-way ANOVA tests were used according to data distribution, followed by appropriate post hoc tests. The significance level was set at p < 0.05. Results The amount of cuspal deflection at 5 minutes was greater than that observed at 24 hours in all groups. CMP, CHD, and BL showed lower cuspal deflection compared with FZ at all time intervals (p < 0.001). CMP exhibited the lowest cuspal deflection values, although no significant differences were found among the low-shrinkage RCs. Conclusion Modifications in the organic matrix or material formulation of the RCs can contribute positively to the control of cuspal deflection and support improved marginal adaptation. The reduced cuspal movement produced by low-shrinkage RCs may increase the likelihood of clinical success by helping preserve restoration integrity.

  RDL Kalıcı Kaydıİncele
• ArticleAçık Erişim2026/r/ebyu/10846
  CBCT-based submandibular fossa depth classification and panoramic fractal dimension analysis in the posterior mandible

  Ocak, Ali; Akyüz, Mehmet

  Deep concavities of the submandibular fossa (SF) in the posterior mandible substantially increase the risk of lingual cortical plate perforation during implant placement. Although cone-beam computed tomography (CBCT) enables accurate three-dimensional assessment of SF morphology, panoramic radiography remains the most commonly used initial imaging modality. We investigated whether trabecular bone texture on panoramic radiographs, quantified using fractal dimension (FD), is associated with CBCT-measured SF depth. In this retrospective cross-sectional study, 133 patients with CBCT and panoramic radiographs obtained within 3 months were included. SF depth was classified as Type I (≤ 2 mm), Type II (2–3 mm), or Type III (> 3 mm). On the matching panoramic level, a 20 × 20-pixel cancellous region of interest was analyzed in ImageJ using box-counting FD. Group comparisons were performed using the Kruskal–Wallis and Mann–Whitney U tests with Bonferroni correction; correlations were assessed using Spearman’s rank correlation coefficient (p < 0.05). A total of 229 hemimandible measurements were evaluated. Mean age was 41.96 ± 15.59 years; 57.1% were female. Mean SF depth was 1.845 ± 0.750 mm and mean FD was 1.0964 ± 0.0667. Median FD was 1.0747, 1.1324, and 1.1340 in Types I, II, and III, respectively (Kruskal–Wallis p = 4.45 × 10⁻⁵). FD was significantly higher in Types II and III versus Type I (p = 0.000514 and p = 0.00633), with no difference between Types II and III (p = 1.00). SF depth positively correlated with FD (Spearman rho = 0.4138, p = 6.95 × 10⁻¹¹). Panoramic FD values reflected CBCT-defined SF depth categories, with deeper concavities showing consistently higher trabecular texture complexity. These results suggest that SF anatomical variation is a previously unrecognized source of regional FD heterogeneity in the posterior mandible and should be considered when interpreting panoramic FD in this region. FD is not proposed as a substitute for CBCT, but as a complementary quantitative descriptor with implications for both surgical risk awareness and radiographic research methodology.

  RDL Kalıcı Kaydıİncele
• ArticleYayıncıda açık erişim2026/r/ebyu/10653
  Biomechanical Behavior of Endodontically Treated Abutment Teeth with Periapical Lesions: A 3D Finite Element Analysis

  Klrmall, Ömer; Zeynalll, Ayten; Akar, Türker; Celik, Huseyin Kursat

  Objectives The stress distribution of teeth with periapical lesions, which are used as abutments in fixed prostheses, and its effect on the success of the restoration are not well known. This study investigates stress distribution in abutment teeth with periapical lesions and surrounding tissues under occlusal load using finite element analysis. Materials and Methods Three models were constructed: (1) a healthy mandibular premolar, (2) a premolar with a periapical lesion restored using a fiber post and single crown, and (3) a similar premolar used as an abutment for a three-unit bridge. A static load of 300 N was applied at a 45-degree angle to the tooth's long axis, targeting the lingual slope of the buccal cusp. Stress and deformation were analyzed across all structural components, including dental tissues and the surrounding trabecular bone. Results The results demonstrated that, in model 2, stress propagation extended more prominently along the root surface and progressed apically, resulting in a higher stress concentration in the periapical lesion region (0.061 MPa) when compared with model 3 (0.054 MPa). Furthermore, the greatest deformation was also observed in model 2. Across all models, peak stress was consistently localized in the cervicobuccal collar region of the tooth. Conclusion These findings underline the importance of prosthesis design in reducing the stress concentration in abutment teeth with periapical lesions and demonstrate the biomechanical advantage of splinted restorations over single crowns in cases with periapical lesions.

  RDL Kalıcı Kaydıİncele
• ArticleAçık Erişim2026/r/ebyu/10446
  Evaluation of trabecular architecture and bone density in periradicular bone of dilacerated mandibular third molars: a cone beam computed tomography study

  Ocak, Ali; Akyüz, Mehmet

  Background: This study aimed to evaluate and compare the periradicular trabecular bone density (BD) and microarchitecture of dilacerated and non-dilacerated mandibular third molars using gray values (GVs) and fractal dimension (FD) derived from cone-beam computed tomography (CBCT) images. Methods: This retrospective cross-sectional study included CBCT scans of 54 patients with dilacerated mandibular third molars and 60 controls without dilaceration. Root dilaceration was defined as deviation > 20° from the long axis. The dilaceration group was further divided into subgroups based on severity (angle of dilaceration > 60° vs. ≤60°). Standardized regions of interest were selected adjacent to the curvature of the roots, excluding cortical bones. GVs were automatically measured by Romexis 6.2.1 (R®software, Planmeca, Helsinki, Finland), and FD was calculated via ImageJ using the box-counting method. Appropriate statistical analyses were performed, with significance set at p < 0.05. Results: No significant differences were found between dilacerated and non-dilacerated groups in GV (437.12 ± 184.83 vs. 439.25 ± 148.90, p = 0.645) or FD (1.07 ± 0.15 vs. 1.04 ± 0.17, p = 0.204). However, when dilacerated teeth were stratified by severity, roots with > 60° curvature exhibited significantly higher FD values than those ≤ 60° (p = 0.040), whereas GV values did not differ between curvature groups (p > 0.05). Spearman’s correlation revealed no significant association between dilaceration angle and GV or FD (p > 0.05). Conclusion: Within the limitations of this study, fractal analysis was used as a quantitative method to assess periradicular trabecular bone changes adjacent to dilacerated root apices. Although overall GV- and FD-based metrics did not differ between dilacerated and non-dilacerated teeth, the higher FD observed in severely dilacerated roots (> 60°) suggests increased trabecular complexity in the apical region, reflecting a potential biological bone response associated with pronounced root curvature.

  RDL Kalıcı Kaydıİncele
• ArticleAçık Erişim2026/r/ebyu/10273
  Association of mandibular third molar positions, ramus height, and gonial angle on panoramic radiographs: a retrospective cross-sectional study

  Altındağ, Ali; Akyüz, Mehmet; Uzun, Sultan; Yüksel, İbrahim Burak; Mağat, Güldane

  Background: The aim of this study was to investigate the relationship between the positions of impacted mandibular third molars and the gonial angle and ramus height, as measured on panoramic radiographs, according to the Pell and Gregory/Winter classifications. Methods: This retrospective study included panoramic radiographs of 700 patients (350 males and 350 females) aged 18–62 years, who presented with bilaterally impacted mandibular third molars. The gonial angle and ramus height were measured, and the position of the impacted third molars was categorized based on the Pell and Gregory/Winter classification systems. Results: The most common third molar impaction position observed was vertical, followed by mesioangular and horizontal positions. The study found that a high gonial angle was more frequently observed in males, while a low gonial angle was more common in females. No significant association was identified between the type of mandibular third molar impaction and the gonial angle or ramus height. Additionally, individuals with high gonial angles had lower ramus heights. Individuals with impacted teeth in the “other” position had statistically higher gonial angles (p < 0.05). Conclusion: The study concludes that there is no significant correlation between the gonial angle, ramus height, and the type of mandibular third molar impaction. However, individuals with impacted teeth in the “other” position were found to have higher gonial angles, which may increase the risk of mandibular fractures. These findings show that although certain impaction types are more prevalent, mandibular anatomical parameters such as gonial angle and ramus height do not appear to significantly influence impaction patterns when assessed on panoramic radiographs.

  RDL Kalıcı Kaydıİncele
• ArticleAçık Erişim2026/r/ebyu/10154
  The Effect of Age and Tooth Loss on Articular Eminence Slope: An Orthopantomographic Study; [Yaş ve Diş Kaybının Eklem Eminens Eğimi Üzerindeki Etkisi: Ortopantomografik Bir Çalışma]

  Çelik, Fatih; Özsoy, Elif; Oktay, Fatih; Taşkesen, Fatih; Diyarbakır, Samih

  Objective: To investigate whether morphologic changes in the cranial component of the temporomandibular joint are associated with aging or tooth loss and, if so, whether articular eminence flattening is more associated with age or edentulism. Methods: Ortopantomographs of patients admitted to the hospital for routine dental treatment were retrospectively analyzed. Patients were divided into 4 groups according to their age and edentulous status. Group1: 49 patients aged 18-35 years with occlusal support, Group2: 46 patients aged 36-59 years with occlusal support, Group3: 43 patients over 60 years with occlusal support, and Group4: 42 patients over 60 years with lost occlusal support. The Frankfort horizontal plane and the articular eminence slope were drawn on the radiographs and the angle between them was measured and the differences between the groups were analyzed. Results: There was no significant correlation between age and flattening of the articular eminence angle (P=.645). A statistically highly significant difference was observed between Group 4 and all other groups in terms of articular eminence angles (P=.01). Conclusion: Since there was no significant correlation between age and articular eminence angle, and since the articular eminence angle was significantly different in Group 4, which consisted of completely edentulous patients, compared to all other groups, it was concluded that AEA may be related to edentulism rather than age. Study emphasizes the importance of occlusion by identifying tooth loss as a possible cause of the decrease in AE slope.

  RDL Kalıcı Kaydıİncele
• ArticleYayıncıda açık erişim2026/r/ebyu/10150
  Gingival inflammation and plaque accumulation affect therapeutic outcomes in patients with acne vulgaris

  Okumuş, Ömer Faruk; Yazıcı, Mustafa; Kantarci, Alpdoğan

  Background: We hypothesized that acne vulgaris (AV) and gingivitis were associated through systemic inflammatory mechanisms, sharing common etiological factors. This study aimed to identify the association between AV and gingivitis and to assess changes in acne severity in relation to changes in the plaque index (PI). Methods: This prospective, observational study included 150 patients aged 13 to 19 years, divided into three equal groups based on acne severity. The PI and the gingival index (GI) of all participants were recorded, followed by oral hygiene instruction and scaling. The severe acne group was re-evaluated after 1.5 months, constituting the follow-up stage of the study. These patients were then divided into two subgroups based on the degree of change in their acne scores. Changes in PI and GI were calculated from repeated measurements. Results: At baseline, although no significant difference was observed between the groups in terms of PI scores (p > 0.05), the GI scores were significantly higher in the severe acne group compared with the mild acne group (p < 0.001). At the re-evaluation, the subgroup with more pronounced improvement in acne scores showed significantly greater changes in both GI and PI values (p < 0.001), and the magnitude of these changes demonstrated good discriminative performance for acne improvement (AUCs = 0.896–0.903; p < 0.001). Conclusions: The findings suggested that gingival inflammation was associated with the severity of AV lesions, independent of plaque accumulation. Thus, improvements in gingival inflammation and plaque accumulation were associated with AV-associated symptom improvement. Trial registration: This study was registered in ClinicalTrials.gov under the number NCT06237387 on May 24, 2024. Plain language summary: Acne vulgaris and gingivitis are common inflammatory diseases. Etiological factors such as nutrition, hormonal changes associated with puberty, and hygiene habits are effective in both diseases. This study aimed to examine the relationships among plaque accumulation, gingivitis, and acne vulgaris. A total of 150 adolescents were included in the study, and participants were divided into three groups based on acne severity: mild, moderate, and severe. All participants were assessed for plaque and gingival inflammation, and all received oral hygiene instruction and dental scaling. Greater reductions in plaque levels and gingival inflammation were observed in patients who showed more pronounced regression of acne lesions.

  RDL Kalıcı Kaydıİncele
• ArticleAçık Erişim2026/r/ebyu/10069
  Three-dimensional finite element analysis of temporomandibular joint stresses following botulinum toxin injection and occlusal splint therapy in bruxism

  Haşimoğlu, Elif; Balaban, Emre; Halat, İsmail Burak; Akın, Muhammet

  Background: Bruxism-related clenching can impose excessive mechanical loads on the temporomandibular joint (TMJ), particularly in the presence of anterior disc displacement (ADD). Understanding how different therapeutic strategies influence joint stress under these conditions can support exploratory, hypothesis-generating assessment of biomechanical unloading within patient-specific models. Therefore, this study aimed to evaluate TMJ stress distributions under normal and displaced disc conditions and to assess the biomechanical effects of simulated treatment strategies using a patient-specific finite element framework. Materials and methods: A patient-specific three-dimensional finite element model derived from clinically acquired computed tomography (CT) data was constructed to simulate TMJ biomechanics during clenching. Stress patterns were analyzed under three disc conditions: normal disc position, unilateral ADD, and bilateral ADD. Intervention scenarios included simulated reductions in masticatory muscle forces representing botulinum toxin Type-A (BoNT-A) therapy and occlusal splint therapy, applied individually and in combination. Peak von Mises stresses within the articular disc and joint structures were compared across all conditions. Results: ADD increased peak stresses within the articular disc and adjacent joint surfaces and shifted stress concentration toward the posterior region of the disc. Simulated reductions in muscle force resulted in progressive decreases in peak joint stresses as additional muscle groups were targeted, whereas splint therapy alone provided moderate stress reduction. The greatest biomechanical unloading was observed when occlusal splint therapy was combined with BoNT-A–related muscle force reduction. Notably, a strategy targeting the masseter and temporalis muscles combined with splint therapy produced lower peak disc stresses than a three-muscle reduction strategy without splint across all disc conditions. Conclusion: In this exploratory single-patient finite element model, ADD increased predicted TMJ stresses during clenching, whereas simulated muscle-force reduction and splint-related changes in occlusal load transmission reduced peak stress metrics, with the largest reductions observed in combined scenarios. These results are hypothesis-generating and intended for relative, within-model comparisons under stated assumptions rather than clinical treatment recommendations.

  RDL Kalıcı Kaydıİncele
• ArticleAçık Erişim2026/r/ebyu/10067
  Radiographic root pulp visibility of the mandibular left second molar as an indicator of legal adulthood (≥ 18 Years): a panoramic study

  Akyuz, Mehmet; Magat, Guldane

  This study aimed to evaluate the diagnostic performance of mandibular left second molar root pulp visibility (RPV) for legal age classification (≥ 18 years) using panoramic radiographs. A total of 983 orthopantomograms (492 males, 491 females) were retrospectively analyzed. Root pulp visibility was classified according to the staging system described by Olze et al. Diagnostic performance measures, logistic regression analysis, and receiver operating characteristic (ROC) analysis were performed. A p-value < 0.05 was considered statistically significant. A statistically significant association was observed between pulp stage and legal age classification (p < 0.001). Logistic regression analysis demonstrated a stage-dependent increase in the odds of being classified as ≥ 18 years, with Stage 2 and Stage 3 showing strong predictive effects (OR = 6.04 and OR = 19.13, respectively). Diagnostic performance analysis indicated that Stage ≥ 2 demonstrated high specificity (0.94). ROC analysis revealed moderate discriminatory performance (AUC = 0.676; 95% CI: 0.647–0.705). Mandibular second molar root pulp visibility may serve as a useful radiographic marker for legal age threshold assessment, particularly at higher pulp stages.

  RDL Kalıcı Kaydıİncele