title: Apical leakage following root canal dressing with calcium hydroxide.
abstract: The purpose of this study was to analyse the apical leakage in teeth filled by the lateral condensation technique following medication with calcium hydroxide. One hundred and twenty extracted human teeth were biomechanically prepared by using exclusively reaming motion with files up to #40. Half of the teeth received a calcium hydroxide dressing for 3 days. The medication was removed by irrigation and reaming motion with files #40 up to #70. The teeth were divided in 6 experimental groups, according to the dimension of the utilized instrument. The root canals were filled and posteriorly the teeth were placed into a 2% methylene blue dye solution inside a flask, which was attached to a vacuum pump. Leakage was measured linearly, and the results showed significantly (p<0.01) less leakage in the experimental groups that received calcium hydroxide dressings than in the control groups. The results persisted even after the removal of 300 micrometers of dentin from the root canal dentinal walls.
authors.affiliation: Department of Endodontics, UNESP Aracatuba, Sao Paulo, Brazil.
authors.forename: R
authors.initials: R
authors.lastname: Holland
authors.forename: A C
authors.initials: AC
authors.lastname: Alexandre
authors.forename: S S
authors.initials: SS
authors.lastname: Murata
authors.forename: C A
authors.initials: CA
authors.lastname: dos Santos
authors.forename: E
authors.initials: E
authors.lastname: Dezan Júnior
mesh_terms: D000704:Analysis of Variance; D002126:Calcium Hydroxide / Q000627:therapeutic use*; D003763:Dental Leakage / Q000517:prevention & control*; D006801:Humans; D012388:Root Canal Irrigants / Q000627:therapeutic use*; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000295:instrumentation; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D012388:Root Canal Irrigants; D015035:Zinc Oxide-Eugenol Cement; D002126:Calcium Hydroxide