title: Loss of hydroxyl ions from gutta-percha points with calcium hydroxide in their composition: an in vivo study.
abstract: The aim of this study was to quantify variations in the pH of calcium-hydroxide, gutta-percha cones that had remained for 1 week inside the root canals of molars or premolars whose endodontic treatment could not be concluded in a single visit. All teeth were instrumented and dried before the placement of the points. The cones were removed, and placed in vials with distilled water. Additional, new gutta-percha cones were also studied as a control. The pH was measured by a pH meter, model CRISON MicropH 2001. The average pH mensurations obtained for new, calcium-hydroxide, gutta-percha points was 10.11; for cones that were used 1 week, it was 7.08. There was a statistically significant difference observed between the two groups by the Student's t test (p > 0.001). After 7 days, a significant decrease takes place in the alkalinity of these points.
authors.affiliation: Departamento de Odontología Consevadora, Universidad Complutense de Madrid, España.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Azabal-Arroyo
authors.forename: Gracia
authors.initials: G
authors.lastname: Menasalvas-Ruiz
authors.forename: Javier
authors.initials: J
authors.lastname: Martín-Alonso
authors.forename: Juan José Hidalgo
authors.initials: JJ
authors.lastname: Arroquia
authors.forename: José María
authors.initials: JM
authors.lastname: Vega-del Barrio
mesh_terms: D000468:Alkalies / Q000737:chemistry; D001641:Bicuspid / Q000503:physiopathology; D002126:Calcium Hydroxide / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000503:physiopathology; D005500:Follow-Up Studies; D006171:Gutta-Percha / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D006878:Hydroxides / Q000737:chemistry; D008963:Molar / Q000503:physiopathology; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation; D013223:Statistics as Topic
chemical_list: D000468:Alkalies; D006878:Hydroxides; D012387:Root Canal Filling Materials; D006171:Gutta-Percha; C031356:hydroxide ion; D002126:Calcium Hydroxide