title: Effect of intracanal medicament on the sealing ability of root canals filled with Resilon.
abstract: The purpose of this in vitro study was to investigate the effects of the use of calcium hydroxide as an intracanal dressing on the sealing ability of a thermoplastic synthetic polymer-based root filling (Resilon). Forty-seven single rooted teeth were decoronated and instrumented to ISO sizes 40. The teeth were randomly divided into three experimental groups of 15 roots each. Group 1 was immediately filled. Group 2 and group 3 had calcium hydroxide paste placed with lentulo-spiral filler. After 7 days, calcium hydroxide was removed from the canals with two different techniques: #15 K-file agitated irrigation with 17% Ethylenediaminetetracitic acid (EDTA) (group 2) or ultrasonically agitated irrigation with 17% EDTA (group 3) for 2 min. All teeth were filled with Resilon points and the resin sealer (Ephiphany root canal sealant) using lateral condensation technique. Two teeth were immediately filled with Resilon master point size 40/.04 without sealer to act as a positive control. A split chamber microbial leakage model using Streptococcus mutans was used and the leakage was evaluated daily for a period of 30 days. Overall, 6 of 44 (14%) of samples filled with Resilon points and the resin sealer had microbial leakage. Three samples in group 1 (21%), two samples in group 2 (13%), and one specimen in group 3 (7%) had bacterial leakage. Using the Fisher's Exact test, there was no statistically significant difference in leakage between the groups with calcium hydroxide dressing and the group without calcium hydroxide (p > 0.05). Under the condition of this study, calcium hydroxide did not adversely affect the seal of the root-canal system filled with Resilon.
authors.affiliation: Department of Endodontics, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
authors.forename: Ching S
authors.initials: CS
authors.lastname: Wang
authors.forename: Gilberto J
authors.initials: GJ
authors.lastname: Debelian
authors.forename: Fabricio B
authors.initials: FB
authors.lastname: Teixeira
mesh_terms: D002126:Calcium Hydroxide / Q000627:therapeutic use*; D003763:Dental Leakage / Q000382:microbiology / Q000517:prevention & control*; D006801:Humans; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D012388:Root Canal Irrigants / Q000627:therapeutic use*
chemical_list: D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; C486892:resilon sealer; D002126:Calcium Hydroxide