Relationship between post-preparation pain and apical patency: a randomized clinical trial

This study was conducted to compare the post-preparation pain experience following root canal preparation with or without achieving and maintaining apical patency during root canal preparation. Root canal preparation was completed in the first visit for eighty patients. The patients were divided randomly into two groups where patency was either established and maintained during preparation or not. Pain was recorded before treatment, 6,12,18,24 and 48 hours after treatment. Patients assessed their severity of pain over the first two days following root canal preparation using a modified visual analog scale of [0-9]. Our results showed that no significant difference was found between the two groups. No significant difference was found between the two groups studied. No significance was found between all the previous preoperative clinical and radiographic findings and post-preparation pain, except preoperative pain. Apical patency did not increase the post preparation pain significantly

effect of apical termination of Root Canal preparation on postoperative pain [clinical study]

This study was conducted to evaluate the effect of apical terminus location of the root canal preparation on postoperative pain. Root canal preparation was completed in the first visit for sixty patients .The working length of the root canals were determined electronically by using apex locator and confirmed radiographically. The patients were divided randomly into three main groups according to apical termination of preparation [0.0, 0.5 and 1mm away from the apical foramen]. They recorded pain before treatment, 6, 12, 18, 24 and 48 hours after treatment. They assessed their severity of pain over the first two days following root canal preparation using a modified visual analog scale of [0-9]. Our results showed that Preparation to the apical foramen produced the highest significant level of postoperative pain at most of the time intervals. Otherwise no significant difference was found between the other groups

influence of apical patency on transportation of the Root canal [laboratory study]

This study was undertaken to evaluate the effect of apical patency on transportation of the apical foramen. Forty extracted human straight single rooted teeth with mature apices were used. The root of each tooth was mounted in a square piece of silicone leaving foramen on top. The specimens were randomly divided into two groups whether patency was established and maintained during preparation or not. Initial and final photographs of apical foramen were taken before and after instrumentation using a stereomicroscope. The images of each specimen [pre and post] were superimposed to determine transportation. No significant difference was found between the studied groups