Summary Background/Aim: Many irrigation solutions are used during root canal treatment. It is unacceptable to confuse irrigation solutions with anesthetic solution and inadvertently inject the patient. After such an error, local and systemic serious complications can be seen in the patient. The purpose of this case report is to show how careless use of etilendiamin tetraacedic acid (EDTA) can result in important complications, and offer some treatment methods for curing symptoms resulting from such complications. Case Report: A 17% EDTA solution, was inadvertently injected in the buccal mucosa of a 20-year-old male during routine root canal treatment. Severe pain, bleeding and mucosal swelling occurred shortly after the injection. Irrigation with saline was performed by sliding the mucoperiosteal flap at the injection site. Then the flap was sutured primary. At the control one week later, there were no areas of necrosis in the patient, but ecchymosis occurred. Decalcified areas were not detected in dental volumetric tomography examination. Conclusions: The dentists must apply the precautions of EDTA irrigation solution during the root canal treatment and manage the treatment of this clinical complication.

Mineral trioxide aggregate is a biocompatible dental material consisting of thyroxide powder and hydrophilic particles. In addition to their dentinogenic and osteogenic potentials, it also exhibits good sealing properties. It has a wide range of areas of use in endodontic and restorative dentistry. In clinical practice, it is a material of choice in many applications such as repair of perforations, root-end fillings, apexhivation and regenerative endodontic treatment procedures, vital pulp treatments.

Introduction: Furcation perforation is one of the complications that occur during endodontic treatment due to anatomical differences or iatrogenic causes. Repairing the perforation with a biocompatible material eliminates the connection with the gingival sulcus and positively affects the prognosis. The sealing ability of the repair materials is very important and is affected by the conditions of the environment in which they are applied. Aim: To compare the sealing efficiency of Mineral Trioxide Aggregate (MTA) (Angelus, Londrina, PR, Brazil) and Biodentine (Septodont, Saint Maur des Fosses, France) materials used in the repair of furcation perforations in acidic and neutral environments. Materials and Methods: This in-vitro experimental study was carried out in the Department of Endodontics at Dicle University Faculty of Dentistry, Diyarbakır, Türkiye and Dicle University Science and Technology Application and Research Center from 10th June 2020 to 22nd July 2020. A total of 96 mandibular molars were used in the study. The specimens were randomly divided into two equal groups (n=48). When the perforations were repaired with MTA and Biodentine materials, each group was divided into four subgroups (n=12). These subgroups were kept in Phosphate Buffered Saline (PBS) and Acetic Acid (AA) solutions for different periods of time from 4 or 34 days, and all groups were immersed in methylene blue solution. The dye penetration level of the divided sections was examined under a stereomicroscope (Leica, Wetzlar, Germany). Microleakage data of all groups were statistically analysed using Kolmogorov Smirnov, Shapiro Wilk’s and Mann-Whitney U Test. Statistical significance was set at 0.05, it was stated that there was a significant difference when p-value <0.05. Results: The short-term (4 days) microleakage level of biodentine material in the AA environment was significantly lower than that of MTA material (p-value=0.005). There was no statistically significant difference between the materials in terms of long-term (34 days) microleakage levels in the AA environment (p-value >0.05). The long-term microleakage level in PBS environment of biodentine material was significantly lower than that of the AA environment (p-value=0.008). Conclusion: Lower microleakage levels were observed in the neutral environment than the acid environment with both MTA and biodentine during both holding periods.

Background/Aim: This study aimed to evaluate the root canal morphology of mandibular first and second premolars with the aid of cone-beam computed tomography (CBCT) in the Southeast Anatolian population. Material and Methods: The study examined a total of 1258 mandibular first and second premolars using cone-beam computed tomography images of 370 randomly selected patients who applied to the Department of OralDental and Maxillofacial Radiology of Faculty of Dentistry, Dicle University due to various indications. The total number of roots and root canals, canal symmetry and correlations between the right and left side of the mandible, and the prevalence in men and women were recorded. Data was analzyed using the Chi-Square and Fisher's Exact tests. Canal configurations were evaluated based on the Vertucci classification. Results: The evaluation of CT images of a total of 370 individuals showed that 88.89% of the first premolars and 98.45% of the second premolars were symmetrical. The canal anatomy of the first premolars suggested that 85.98% of the premolars were of Type I, 12.02% were of Type V, and 2% were of Type III based on the Vertucci classification. On the other hand, the canal anatomy of the second premolars revealed that 98.83% were of Type I, 0.67% were of Type V, and 0.5% were of Type III. Conclusions: The prevalent morphology of the multiple canals was Type V, except for the Vertucci classification Type I in the mandibular first premolars. Limited number of canal variations were observed in the mandibular second premolars.