Haydar Albayrak

Amaç Bu çalışmanın amacı, intraoral maksillofasiyal protezlerle ilgili çoktan seçmeli sorulara dört yapay zeka (YZ) tabanlı sohbet robotu tarafından verilen yanıtların doğruluğunu ve zaman içi tutarlılığını karşılaştırmalı olarak değerlendirmektir. Gereç ve Yöntemler Maksillektomi obturatörleri, palatofaringeal obturatör ve palatal lift protezleri, mandibular rehber flanş protezleri ve implant tutuculu obturatörler gibi konuları kapsayan, tek doğru şıklı 40 çoktan seçmeli soru hazırlandı. Sorular her bir sohbet robotuna aynı gün içinde sabah, öğle ve akşam olmak üzere 3 kez yöneltildi. Yanıtlar cevap anahtarı ile karşılaştırılarak her bir cevabın doğru veya yanlış olduğu kaydedildi ve doğruluk oranları hesaplandı. Doğruluk üzerine YZ modeli ve zamanın etkisini incelemek amacıyla genelleştirilmiş lineer karma model oluşturuldu. Zaman içi tutarlılık, aynı soruya 3 tekrarda da aynı şıkkın verilme oranı ve Fleiss Kappa katsayıları ile değerlendirildi. Bulgular Genel doğruluk oranları ChatGPT için %95, Claude için %92.5, Gemini için %88.3 ve Copilot için %88.3 olarak bulundu. Genelleştirilmiş lineer karma model analizinde sohbet robotları arasında (p = 0.084) ve zamanlar arasında da istatistiksel olarak anlamlı bir fark saptanmadı (p = 0.760). Soru kimliğinin rastgele etkisi anlamlıydı ve sorular arasında zorluk farkı bulundu. Zaman içi tam stabilite oranları ChatGPT için %92.5, Copilot için %95, Gemini için %85 ve Claude için %92.5 olarak hesaplandı. Fleiss Kappa katsayıları 0.84-0.95 aralığında olup yüksek derecede uyumluydu. Sonuçlar Dört sohbet robotu, intraoral maksillofasiyal protez sorularında yüksek doğruluk ve yüksek zaman içi tutarlılık göstermiştir. Bununla birlikte bazı sorularda tutarlı biçimde hatalı yanıtlar verilmesi, bu araçların uzman değerlendirmesi ve güncel literatürün yerini alamayacağını, ancak eğitim süreçlerinde tamamlayıcı bir kaynak olarak yararlı olabileceğini göstermektedir.

Objective: The objective of this research is to assess the oxide layer thickness in Co-Cr frameworks sourced from various suppliers and explore its correlation with the strength of the metal-ceramic bond. Materials and Methods: Three groups were formed: Group C (Wirobond C), produced via the casting technique; Group M (Meto powder) and Group R (Remanium Star CL powder), both fabricated using the selective laser melting (SLM) method. MC bond strength was evaluated by the three-point bending test in accordance with ISO 9693-1:2022, while oxide layer thicknesses were analyzed using field emission scanning electron microscopy (FE-SEM) and confirmed through energy-dispersive X-ray spectroscopy (EDS). Statistical analysis was performed using SPSS version 20.0. One-way ANOVA was applied to bond strength values, and the Kruskal-Wallis test was used for oxide layer data. Results: No statistically significant difference was observed in MC bond strength among the groups (p = 0.69). Each group demonstrated bond strength values exceeding the 25 MPa clinical acceptability limit. In contrast, a statistically significant difference in oxide layer thickness was found, with Group R exhibiting a thicker oxide layer than the others (p < 0.001). Conclusion: Although the oxide layer thicknesses varied depending on the manufacturing method and powder composition, these differences did not affect MC bond strength. Further research is required to clarify the influence of trace elements and define the optimal oxide layer thickness for improved long-term performance of MC restorations.

This randomized clinical trial aimed to evaluate the effect of calcium hydroxide-based, calcium silicate-based and epoxy resin-based root canal sealers on postoperative pain (PP) after a single session of non-surgical endodontic retreatment of the teeth with chronic apical periodontitis. Ninety-six participants who had teeth with previously root canal treatment, asymptomatic, a single root and single canal, chronic apical periodontitis, were included in the study and then were randomly allocated to one of three experimental groups. (n = 32 per group).An endodontic specialist performed same retreatment protocols in a single visit. Participants were asked to rate the intensity of PP on a visual analogue scale at 6, 12, 24, and 48 h, and 3, 4,5, 6, and 7 days, and to mark whether they had taken analgesic (400 mg Ibuprofen) during the same periods after retreatment. All statistical analyses were performed using a software program (IBM SPSS Statistics, Version 22), and the significance level was set at P < 0.05. There was no significant difference between the groups in PP and analgesic intake at any of the time intervals evaluated(P > 0.05).A strong positive correlation was observed at 48 h and 96 h when the correlation between PP and analgesic intake was evaluated regardless of the type of root canal sealer. PP level was associated with age, gender, Periapical Index (PAI) score, and jaw type.(P < 0 0.05). Epoxy resin, Calcium silicate, and calcium hydroxide–based root canal sealers resulted in statistically similar postoperative pain levels. Each of the epoxy resin, calcium silicate, and calcium hydroxide-based root canal filling materials could be used safely in patients when considering PP. ClinicalTrial.gov, NCT06803277, record date: 2025-01-17, retrospectively registered.

Amaç: Bu çalışma, yerel ve uluslararası üreticilere ait iki farklı renk skalasının (Eray Deluxe ve Vita Classical) renk parametrelerini karşılaştırmaktır. Yöntem: Çalışmada, her iki markaya ait 10 adet renk skalası (n=10) kullanılarak toplam 320 renk örneği değerlendirildi. Renk ölçümleri, standart ışık koşulları altında bir spektrofotometre ile gerçekleştirildi. Her bir renk numunesinden altı ölçüm alındı ve CIELAB renk uzayında L*, a* ve b* değerleri kaydedildi. Renk farklılıkları, CIEDE2000 (ΔE₀₀) formülü kullanılarak hesaplandı. İstatistiksel analizler Kolmogorov-Smirnov testi, bağımsız örneklem t-testi ve Mann-Whitney U testi ile yapıldı (α=0,05). Bulgular: Eray Deluxe renk skalasının ΔE₀₀ değerleri, tüm renk gruplarında Vita Classical’a kıyasla anlamlı derecede daha yüksek bulundu (p < 0,001). En büyük fark D renk grubunda gözlenirken, en düşük fark A renk tonlarında saptandı. Eray Deluxe renk skalasının L* değerleri D renk grubunda daha yüksek, a* değerleri ise genel olarak daha düşük bulundu (p < 0,05). b* ekseninde Eray Deluxe renk skalasının daha sarı tonlara sahip olduğu belirlendi. Klinik olarak en sık kullanılan renk tonlarında (A1, A2, A3, B1 ve B2) her iki renk skalası arasında anlamlı ΔE₀₀ farkları tespit edildi. Sonuçlar: Her iki renk skalasının da hedef renklere tam uyumlu olmadığı, ancak Vita Classical’ın daha düşük ΔE₀₀ değerleriyle hedef renge daha yakın olduğu belirlendi. Klinik pratikte, renk seçiminde kullanılan skalalar arasındaki farklılıklar göz önünde bulundurulmalıdır.

The purpose of this study was to examine the influence of fast sintering on the optical properties, fracture strength, and microstructure of monolithic zirconia (MZ) ceramics. After 20 disc-shaped and 4 square-shaped samples from the MZ block were machined in the CAM device, groups were created by the sintering procedure in accordance with the manufacturer's recommendations: Standard (Grup S; disc-shaped n = 10 square-shaped n = 2) and fast (Grup F; disc-shaped n = 10 square-shaped n = 2). Then, hydrothermal aging was applied to all samples. To calculate translucency, opalescence, and fluorescence values, the LabCh color data of the samples were defined using spectrophotometers. The disc samples were biaxially fracture tested, and the values were determined. The chemical content, grain size (GS), and phase composition of the square-shaped samples were analyzed, respectively. Since the grain size did not conform to the normal distribution, the Mann–Whitney U test was used for statistical analysis, and all other variables were analyzed by an independent sample t test ( α = 0.05). The sintering procedure affected translucency, opalescence, fracture strength, and GS significantly ( P < 0.05), but not fluorescence ( P > 0.05). While both groups had similar crystal structures, there were some minor differences in chemical content. All samples had a higher fracture strength than the ISO 6872 standard recommends. The sintering procedure had no clinically significant effect on the optical properties of MZ. The fast sintering procedure of MZ can be recommended.

The purpose of this study was to evaluate the performance of widely used artificial intelligence (AI) chatbots in answering prosthodontics questions from the Dentistry Specialization Residency Examination (DSRE). A total of 126 DSRE prosthodontics questions were divided into seven subtopics (dental morphology, materials science, fixed dentures, removable partial dentures, complete dentures, occlusion/temporomandibular joint, and dental implantology). Questions were translated into English by the authors, and this version of the questions were asked to five chatbots (ChatGPT-3.5, Gemini Advanced, Claude Pro, Microsoft Copilot, and Perplexity) within a 7-day period. Statistical analyses, including chi-square and z-tests, were performed to compare accuracy rates across the chatbots and subtopics at a significance level of 0.05. The overall accuracy rates for the chatbots were as follows: Copilot (73%), Gemini (63.5%), ChatGPT-3.5 (61.1%), Claude Pro (57.9%), and Perplexity (54.8%). Copilot significantly outperformed Perplexity (P = 0.035). However, no significant differences in accuracy were found across subtopics among chatbots. Questions on dental implantology had the highest accuracy rate (75%), while questions on removable partial dentures had the lowest (50.8%). Copilot showed the highest accuracy rate (73%), significantly outperforming Perplexity (54.8%). AI models demonstrate potential as educational support tools but currently face limitations in serving as reliable educational tools across all areas of prosthodontics. Future advancements in AI may lead to better integration and more effective use in dental education.