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Öğe 3D Micro-CT Analysis of Void and Gap Formation in Curved Root Canals(NLM (Medline), 2017) Şımşek N.; Keleş A.; Ahmetoğlu F.; Akinci L.; Er K.Objective: This study used microcomputed tomography (micro-CT) to compare the volumes of voids and gaps in curved root canals instrumented and filled using various techniques. Methods: Twenty extracted mandibular first molars with two curved mesial root canals were used. Root canals were instrumented using a self-adjusting file (SAF) or Revo-S file system. For standardization, mesiobuccal canals were instrumented with SAF and mesiolingual canals were instrumented with Revo-S in each root. The canals were divided into four experimental groups (n=10 in each). The canals were then filled via cold lateral compaction (CLC) or a thermoplasticized injectable technique (TT) using gutta-percha and AH Plus root canal sealer. The roots were scanned with a micro-CT, and the volumes of the voids and gaps were calculated using three-dimensional (3D) micro-CT images. Data were analyzed using unpaired t- and Kruskal-Wallis tests. A value of P<0.05 was considered significant. Results: None of the tested techniques provided void- or gap-free fillings. Nevertheless, the SAF showed more gap formation than the Revo-S, and TT showed higher gap formation in all experimental groups. These differences, however, were not statistically significant (P>0.05). Conclusion: The SAF and Revo-S rotary file systems yielded comparable results. No statistically significant difference was found between the results of the various instrumentation and filling techniques. Copyright: © 2020 European Endodontic Journal.Öğe Biocompatibility of a new epoxy resin-based root canal sealer in subcutaneous tissue of rat(Dental Investigations Society, 2015) Simsek N.; Akinci L.; Gecor O.; Alan H.; Ahmetoglu F.; Taslidere E.Objective: The objective was to evaluate the subcutaneous biocompatibility of two root canal sealers. Materials and Methods: Thirty female rats were distributed into two groups of 15 animals. Each received subcutaneous dorsal implants: Silicone tubes filled with AH Plus or Obtuseal. After the 11th, 14th, and 45th days, tissues were collected for biopsy and fixed and processed for histologic evaluation. Observations of the cellular inflammatory components, such as lymphocytes and macrophages, were made. The data were analyzed using Kruskal-Wallis and Connover tests (P < 0.05). Results: By the 7th day, lymphocyte infiltration increased in both groups (P = 0.0104). However, macrophage infiltration increased only in the AH Plus group (P = 0.0011). By the 14th and 45th days, lymphocyte and macrophage infiltrations were reduced. At the end of the experimental period, no statistically significant differences were found between the AH Plus group and the Obtuseal group (P > 0.05). Conclusion: After 45 days, Obtuseal yielded a satisfactory tissue reaction; it was biocompatible when tested in subcutaneous rat tissue. On the basis of the obtained results, it was concluded that Obtuseal root canal sealer caused a satisfactory tissue reaction as AH plus, because it was biocompatible when tested in the subcutaneous tissue of rats. © 2015 Dental Investigations Society.Öğe The intercuspal and interorifice distances of maxillary molars: A cone-beam computed tomography study(Mashhad University of Medical Sciences, 2024) Akinci L.; Öztürk H.; Dedeoğlu N.Objective: Proper and conservative endodontic access cavity preparation is a crucial step in performing a successful root canal treatment that ensures a long-term prognosis. This study aimed to evaluate the intercuspal and interorifice length of maxillary first and second molars using cone beam computed tomography (CBCT). Methods: The CBCT scans of 400 mature and intact maxillary first and second molars (16, 17, 26, and 27) were evaluated. The measured variables included the distances between the buccal cusps (intercuspal distance) and buccal orifices (interorifice distance), the interorifice/intercuspal ratio, and the angle at the intersection of interorifice and intercuspal lines. The variables were compared between different teeth and between male and female patients. Results: The interorifice and intercuspal distances were significantly greater in males compared to females (P<0.05), except for the intercuspal distance in the left maxillary second molar (P=0.056). There was a statistically significant difference concerning the angle formed between the interorifice and intercuspal lines among tooth numbers 26 and 27 (P=0.044). The interorifice/intercuspal ratio was significantly different between the maxillary first and second molars on the right (P=0.006) and left sides (P<0.001). Conclusions: The angle formed between the intercuspal and interorifice distances and the interorifice/ intercuspal ratio was greater in the maxillary first molars compared to the second molars. Moreover, males generally had larger internal and external anatomical features than females. Hence, when preparing a conservative access cavity in maxillary molars, clinicians are advised to consider both the external tooth anatomy and the patient's gender as important factors. © 2023 Mashhad University of Medical Sciences.Öğe The quality of different preparation and root canal filling techniques in curved root canals(2014) Şimşek N.; Ahmeto?lu F.; Akinci L.; Kapdan A.Objectives: The aim of this study was to evaluate the quality of different root canal filling techniques that lateral compaction (LC) and thermoplasticized injectable (TPE) gutta percha in curved root canals which were prepared Revo-S or self-adjusting file (SAF) using digital radiographs. Materials and Methods: Fourty extracted mandibular molar of mesial canals of teeth which have curved root canals were prepared using SAF or Revo-S instruments. After determination of root canal curvatures in two directions, the canals were divided two subgroups (n=20, p>0.05). Both mesiobuccal and mesiolingual canals were shaped and filled with AH Plus and either LC technique or TPE gutta percha obturation technique. The specimens were stored for 1 week at 37 °C and 100% humidity to allow the complete setting of the sealer. Postoperative digital radiographs were taken to evaluate the quality of root canal fillings. Data were analysed using Mann-Whitney U tests. Result: In terms of the preparation techniques, no significant differences were found between the root canal filling techniques (p=0.051, p=0.127). Conclusion: Under the conditions of the present study, neither preparation nor obturation techniques did not affect the quality of root canal filling in curved root canals.
