Browsing by Author "Bas, Zuleyha"

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Evaluation of Preoperative Apical Periodontitis, Treatment Indications, and Methods in Endodontically Treated Teeth: a Retrospective Study
(BMC, 2025) Gunduz, Huseyin; Bas, Zuleyha; Kilic, Asli Zeynep Kapoglu; Apari, Beyda Sevgul; Sahin, Pelinsu
Background This study evaluated the presence of preoperative apical periodontitis (AP) in endodontically treated teeth within a Turkish population, along with its causes, treatment methods, and the effectiveness of preventive and early intervention practices. Methods A retrospective analysis was conducted on 1,440 teeth from 1,055 patients treated at Van Y & uuml;z & uuml;nc & uuml; Y & imath;l University between 2021 and 2023. Preoperative panoramic and periapical radiographs and postoperative periapical radiographs were examined. Data recorded included patient demographics, treated tooth location, presence of preoperative AP, coronal restorations, reasons for treatment, treatment methods, and number of missing and endodontically treated teeth. Statistical analyses were performed using Chi-Square, Mann-Whitney U, Kruskal-Wallis, and Spearman correlation tests. Results The overall incidence of AP was reported as 28.7%. It was more frequently observed in the mandible than in the maxilla and in incisors compared to other tooth groups (p < 0.001). Caries was the primary reason for treatment in molars (81.5%), while periodontal disease was more common in incisors (p < 0.001). As age increased, the number of endodontically treated and missing teeth also rose (p = 0.019; p < 0.001). Teeth with crowns had a lower AP rate, while retreatments due to periodontal disease or previous root canal failures showed higher AP rates (p < 0.001). Conclusions The high AP rate and the predominance of caries and periodontal disease as treatment causes indicate insufficient application of preventive and early treatments. AP prevalence varied by jaw location, tooth group, coronal restoration and treatment method. This study provides epidemiological data on endodontically treated teeth and their association with AP. These findings emphasize the importance of early diagnosis, preventive measures, and effective treatment planning in preserving tooth survival.
Influence of Passive Ultrasonic Irrigation Cycles on the Penetration Depth of Sodium Hypochlorite into Root Dentin
(Nature Portfolio, 2025) Gunduz, Huseyin; Ozlek, Esin; Bas, Zuleyha
This study explores innovative passive ultrasonic irrigation (PUI) parameters by investigating a novel, shorter, and more repetitive agitation cycle to enhance the penetration depth of sodium hypochlorite (NaOCl) within dentinal tubules. Forty extracted human mandibular premolars were prepared (size 40, 0.06 taper) and stained with 0.5% crystal violet. Samples were divided into four irrigation groups: (I) Conventional Needle Irrigation (CNI), (II) PUI with 2 cycles of 30 s each, (III) PUI with 3 cycles of 20 s each, and (IV) PUI with 6 cycles of 10 s each. Coronal, middle, and apical sections were analyzed by light microscopy, and NaOCl penetration depth was measured at four sites (mesial, distal, buccal, lingual) using ImageJ. Data were analyzed using Kruskal-Wallis/Dunn's test (alpha < 0.05). The CNI group demonstrated significantly lower NaOCl penetration compared to all PUI groups (P < 0.001). The 6 x 10 s protocol achieved significantly greater penetration in all regions (P < 0.001). While no significant differences were observed between the 2 x 30 s and 3 x 20 s protocols in the coronal and middle thirds, the 3 x 20 s group showed significantly greater penetration in the apical third (P < 0.001). The findings of this study suggest that optimizing PUI agitation parameters can lead to more effective, efficient, and predictable endodontic treatment, enhancing irrigation efficacy. Shorter and more frequent cycles (6 x 10 s) proved to be the most effective, providing valuable information for clinical practice.