This study aimed to assess the fracture resistance and fracture patterns of endodontically treated permanent mandibular molars restored with either preheated or nonpreheated conventional composite resin or short fiber-reinforced composite resin (SFRC). One hundred and twenty mandibular molars with prepared mesio-occluso-distal (MOD) cavities were allocated to six groups: positive control (intact teeth, no restoration, n = 20), negative control (endodontically treated but unrestored, n = 20), and four experimental groups restored with conventional composite, preheated composite, SFRC, or preheated SFRC (n = 20 each). After thermocycling, fracture resistance was tested using a universal testing machine at 0.5 mm/min. Data were analyzed using Jamovi software (Version 2.4.8; The Jamovi Project, Sydney, Australia). Normality was assessed with the Kolmogorov–Smirnov test. Group differences were evaluated using the Kruskal–Wallis test followed by the Dwass–Steel–Critchlow–Fligner post hoc test. The association between fracture modes and fracture strength categories was examined using the chi-square test of independence. A p-value < 0.05 was considered statistically significant. The positive control showed significantly greater fracture strength than all restored groups (p < 0.05). All restored groups had significantly higher fracture resistance than the negative control (p < 0.05), with no significant differences among the restored groups (p > 0.05). A significant association was found between fracture mode and fracture strength (χ²(1) = 6.97, p = 0.008). The preheated SFRC group showed a higher rate of restorable fractures compared to others, suggesting improved clinical reparability with preheating.

The present case report describes the non-surgical treatment of alveolar inferior nerve paresthesia caused by the extrusion of calcium hydroxide as intracanal medicament. A 45-year-old female patient had a chief complaint of numbness and pain in the left lower lip region for 2 months. Radiographic examination revealed calcium hydroxide overflow into the mandibular canal. Irrigation of the root canal system with saline using a 27-gauge needle was done to remove as much calcium hydroxide as possible but proved ineffective in removing material from the outside tissues. Root canal treatment was completed in 1 week, and non-surgical paresthesia treatment with steroids and pregabalin was done for one month. In the 1-year follow-up control, the paresthesia had reduced significantly. In a 4-year follow-up visit, there was a complete resolution of paresthesia, and the radiographic analysis showed that calcium hydroxide was completely resorbed.

Objective: At the present time patients in developed countries widely use online resources to access medical information. YouTube is a widely used website to get knowledge. In the past, medical and dental data were accessed only by doctor and dentist examinations. This research was aimed to assess the quality and quantity of the knowledge content in popular YouTube™ videos about laser root canal treatment (LRCT). Method: Google Trends showed that "laser root canal treatment" was the most searched keyword on the topic. Included videos were assessed as the video's name, universal resource locators, the number of video display, time of adding in website, total numbers of likes, dislikes and comments and total video time. Each video was classed into the 3 groups according to their information source as dentist, commercial, dental clinic. This video was classified according to the quality of information content as ‘good’, ‘poor’, or ‘bad’. In the evaluation of the data, the distribution of variables was examined with the Shapiro-Wilk normality test, the intergroup comparison of variables that did not show a normal distribution was examined with the Kruskal Wallis test. Comparison of subgroups was examined with Dunn's multiple comparison test and comparison of qualitative data was analyzed with Chi-square test. The results were evaluated at the significance level of p

Aims: COVID 19 emerged in December 2019 and was declared a global pandemic on March 11, 2020. Many countries postponed non urgent dental care, including routine endodontic visits from March 21, 2020. Restricted access to dental treatment and prolonged quarantine may trigger psychological distress. This study evaluated patients’ anxiety regarding emergency endodontic treatment during the pandemic. Methods: A cross-sectional survey was administered to 261 patients at the Department of Endodontics, Ordu University, between March 21 and December 21, 2021. Participants completed a 28-question anonymous questionnaire after providing written informed consent. Psychological distress was assessed using the Kessler 10 scale, and statistical analyses were performed with significance set at p

Background/Objectives: The primary purpose of the study is to investigate the bond strength of apical fillings following retreatment in teeth with failed apical resection. Methods: After the preparation and obturation of the 120 human upper central and canine teeth, apical 3 mm was resected and separated into two main groups to prepare retrograde cavities using tungsten carbide burs or ultrasonic retro-tips. Each main group was separated into three subgroups according to retrograde filling material (Glass ionomer cement, MTA and Biodentine), and each subgroup was divided according to placement technique: manual condensation and indirect ultrasonic vibration. After the retrograde filling, retreatment procedures were performed, and 2 mm sections were removed from the apical filling and analyzed for push-out test. A Kolmogorov–Smirnov test was used to check the normal distribution of the data while Levene’s test was used to check the homogenity of group variances. The data were analyzed using three-way ANOVA. Results: The analysis of variance demonstrated a significant difference between cavities prepared with tungsten carbide and ultrasonic retro tips in push-out bond strength. Conclusions: There was no effect on the bond strength of the retrograde filling material and the placement technique of the material.

Objective: This study aimed to compare the removability of fractured nickel-titanium rotary instruments with different working principles in the middle and coronal thirds of the canal using ultrasonic tips and the BTR pen. Method: Thirty-two mandibular molars were selected from recently extracted teeth that met the inclusion criteria. Teeth had to have a closed apex, no root caries, anomalies, fractures, cracks, or signs of internal or external resorption. The mesiobuccal roots were intentionally fractured, and the root inclination was confirmed to be ≤20° using Schneider's method. Teeth with a higher inclination angle were excluded. Access cavities were opened traditionally to allow direct canal access, and apical patency was verified with #10 K files. Canal lengths were measured, and teeth were embedded in acrylic blocks for easier handling. The teeth were divided into four study groups (n=8) based on the working principle of the instrument and the location of the fractured instrument (coronal or middle third). NiTi instruments with the same taper (0.6) and heat treatment (blue) were selected. A 4 mm mark was made on each file, and files were thinned to half their thickness at the designated breaking point using a diamond bur. A stage platform was created with Gates Glidden burs to improve the visibility of the broken instruments. After creating the platform, dentin around the broken files was removed by 2 mm with ultrasonic tips, and the broken pieces were extracted using a BTR Pen with a 0.3 mm thin wire loop. Results: When analyzed by working principle, the removal time for fractured instruments in the middle third was significantly higher (p=0.0001). Within the coronal third, the removal time for reciprocal files was significantly longer (p=0.021). Similarly, in the middle third, the removal time for reciprocal files was statistically longer (p=0.004). Conclusion: The BTR Pen was effective for both rotary file systems. The location of the fractured instrument influenced the removal time, with faster results in the coronal third due to better access and visibility. Additionally, the type of fractured NiTi rotary instrument also impacted the time required for successful removal, with rotary instruments in the middle third taking significantly longer.