title: pH changes and calcium ion diffusion from calcium hydroxide dressing materials through root dentin.
abstract: The purpose of this study was to evaluate Ca2+ and OH- diffusion properties through root dentin by using different calcium hydroxide (CH) dressing materials. Twenty-eight single-rooted teeth were instrumented and external defects were created on the root surface. 17% EDTA was used to eliminate the smear layer. All surfaces except the external defects were sealed, and the teeth were placed in normal saline. Ca2+ concentrations and the pH in the saline were determined for 3 days as the control period. After removing the teeth from normal saline, they were filled with: (i) DT Temporary Dressing CH; (ii) CH powder and normal saline; (iii) TempCanal; and (iv) CH points. The teeth were then placed in normal saline, and Ca2+ concentrations and pH values were measured at 1, 3, 7, 14, and 28 days. Nonsetting CH pastes gradually released Ca2+, whereas this increase was absent from CH points. None of the test materials induced a pH increase in the media during the observation period. This study demonstrated that, when nonsetting CH pastes are applied to the root canal, diffusion of Ca2+ without an increase in pH to the surrounding media occurs. This implies that these type of material are more suitable than CH points for treatment of external root resorption.
authors.affiliation: Hacettepe University, Faculty of Dentistry, Department of Endodontics, Ankara, Turkey.
authors.forename: S
authors.initials: S
authors.lastname: Calt
authors.forename: A
authors.initials: A
authors.lastname: Serper
authors.forename: B
authors.initials: B
authors.lastname: Ozçelik
authors.forename: M D
authors.initials: MD
authors.lastname: Dalat
mesh_terms: D002126:Calcium Hydroxide / Q000737:chemistry / Q000493:pharmacokinetics*; D003804:Dentin / Q000378:metabolism*; D004058:Diffusion; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017136:Ion Transport; D012388:Root Canal Irrigants / Q000737:chemistry / Q000493:pharmacokinetics*
chemical_list: D012388:Root Canal Irrigants; D002126:Calcium Hydroxide