Prevalence of persistent apical periodontitis in patients with root canal-filled teeth: A cone-beam computed tomography study

Aim: Apical periodontitis is the inflammatory destruction of periradicular tissues that occurs gradually over time, primarily originating from invading bacteriain the root canal system and initiated by the release of bacterial products. In this study, the prevalence of post-treatment apical periodontitis was assessedwith cone-beam computed tomography imaging and the effects of tooth-level and patient-level factors that may predict the failure of root canal treatmentwere investigated in a Turkish subpopulation.Material and Methods: Our study included 305 cone-beam computed tomography images of patients (153 males, 152 females aged 18 to 78 years) [Mean ±standard deviation (SD) = 39.2 ± 17.6].Results: Post-treatment apical periodontitis prevalence was 83.3% and was more common in the premolars (9.5%), the mandible (11.8%), and the left side ofthe jaw (11.8%).Discussion: This study showed a high prevalence of post-treatment apical periodontitis in a Turkish subpopulation even in cases in which the quality of rootcanal filling appeared to be sufficient radiologically. Cone-beam computed tomography is one of the most sensitive imaging techniques for the detection ofapical periodontitis.</p

Effects of three different embedding media on the accuracy of different electronic apex locators: An in vitro study

Aim: In this study, we aimed to evaluate in vitro the measurement accuracy of three electronic apex locators (EALs) in three different embedding media

The effects of different nickel-titanium instruments on dentinal microcrack formations during root canal preparation.

OBJECTIVE: The aim of the present study was to investigate the incidence of dentinal microcracks caused by different preparation techniques. MATERIALS AND METHODS: 120 extracted human mandibular incisor teeth were divided into five experimental groups and one control group (n = 20): Group 1: Hand preparation with balanced force technique up to #25 K-file. Group 2: Preparation with only ProTaper F2 instrument in a reciprocating movement. Group 3: Preparation with Reciproc R25 instrument in a reciprocating movement. Group 4: Preparation with ProTaper instruments up to F2 instrument. Group 5: Preparation with ProTaper Next instruments up to X2 instrument. No procedure was applied to control group. The roots were sectioned horizontally at 3, 6 and 9 mm from the apex and examined. Absence or presence of dentinal microcracks was noted. RESULTS: The Chi-square test was performed to compare the appearance of cracked roots between all groups. There were no significant differences among the groups (P > 0.05). CONCLUSIONS: In conclusion, except the hand file and control group, all experimental groups showed microcrack formations