Warm vertical obturation with three different sealers, effects of technique on sealing ability and potential for retreatment
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INTRODUCTION: There are many new types of root canal sealers that are currently available to clinicians. The aim of this study was to evaluate the sealing ability and potential for retreatment of three different sealers: Kerr PCS, Bioceramic Sealer (BCS) and a new sealer named Pacendo. MATERIAL AND METHODS: A dye penetration test on the 90 palatal root of maxillary molars was performed in 6 experimental groups. Each group contained a combination of a sealer with either single cone or warm vertical obturation technique. The retreatment study was performed on 90 distal roots of mandibular molars to assess success in regaining patency, procedure time, possible filling material extrusion and post-retreatment sealer/gutta-percha residue. A setting time test and SEM/EDS analysis were conducted to assess the effect of heat application on physicochemical properties and microstructure of each sealer. RESULTS: There were no significant differences in dye leakage among all groups. A significant difference was observed in the retreatment time. The highest amount of sealer residue was observed in the BCS and single cone obturation group. Heat application decreased setting time of all three sealers; however, BCS did not meet ISO requirements’ for setting time. Heat application resulted in minor changes in the compositional elements of each sealer but noticeable effects on microstructure of BCS. CONCLUSION: Heat application in warm obturation techniques may modify physicochemical properties of root canal sealers.