ABSTRACT
Different techniques are employed for sealer placementinto the root canal system. The purpose of this study was to compare the percentage of voids following root canal obturation with gutta percha and AH26 sealer using four different sealer placement techniques. In this laboratory experimental study, root canals of 50 mandibular second premolars were prepared using the step-back technique. The teeth were assigned to 4 experimental groups of 10 and one control group based on sealer placement technique. After sealer application and canal obturation with lateral condensation technique, specimens were horizontally cut into 3 mm slices. Sections were evaluated under a digital microscope at 150X magnification for void detection in apical, middle and coronal thirds. Kruskal Wallis and Bonferroni tests were applied to compare the percentage of voids between different groups. No significant difference was found in void percentage in one-thirds or total sections between the four methods [P=0.276]. Overall, no significant difference was noted in void percentage between the four techniques of sealer placement
ABSTRACT
Statement of Problem: Flare up is an acute exacerbation of an asymptomatic pulpal and/or periapical pathosis after commencement or termination of root canal therapy. Its incidence may be different in patients treated by different practitioners regarding their graduation status
Purpose: The aim of this study was to compare flare up incidence in patients treated by dental students of Shiraz Dental School and those whom were treated by endodontists
Materials and Method: Patients' information including age, gender, and previous history of pain and pulp vitality were taken before treatment of 383 patients. 230 of them were treated by senior dental students of Shiraz Dental School and 153 of them were treated by endodontists. Students employed conventional step back technique whereas specialists had a chance to select variety of techniques. Data, regarding the quantity of pain experienced by patients were collected 48 hours after treatment. Case was considered a flare up if the patient had experienced severe pain which hadn't been reduced either by analgesic medication or by consequent swelling. Chisquare statistic tests were used to analyze the receiving data
Results: 41 individuals [10.7%] out of 383 patients depicted flare up. 13.5% of these patients were treated by students and 6.5% were treated by endodontists. The difference was statistically significant
Conclusion: Different rate of flare up in two groups is probably due to the dissimilarity in skills, techniques and materials used by different operators