title: pH changes in root dentin after intracanal placement of improved calcium hydroxide containing gutta-percha points.
abstract: The in vitro pH changes in root dentin over a period of 2 weeks was investigated in 48 extracted bicuspids after intracanal placement of either Roeko Calcium Hydroxide Plus Points, aqueous calcium hydroxide paste, or gutta-percha points (control group) after root canal preparation. Microelectrodes were placed in outer and inner root dentin at cervical, middle, and apical thirds of the root to measure the pH at 1 h, 2 h, 3 h, 1 day, 3 days, 7 days, and 14 days. Roeko Calcium Hydroxide Plus Points reached a peak inner dentine pH of 11.67 and a peak outer dentine pH of 10.82 at 3 h. In addition, Roeko Calcium Hydroxide Plus Points maintained an outer dentine pH above 9.5 for approximately 2 days, whereas the aqueous calcium hydroxide paste did not reach this pH. However, the alkalinity in dentin with Roeko Calcium Hydroxide Plus Points was maintained for 7 days only, whereas aqueous calcium hydroxide paste maintained an alkaline environment throughout the 2-week period.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore.
authors.forename: Chew Han
authors.initials: CH
authors.lastname: Ho
authors.forename: Angela
authors.initials: A
authors.lastname: Khoo
authors.forename: Russell
authors.initials: R
authors.lastname: Tan
authors.forename: Jennifer
authors.initials: J
authors.lastname: Teh
authors.forename: Kian Chong
authors.initials: KC
authors.lastname: Lim
authors.forename: Varawan
authors.initials: V
authors.lastname: Sae-Lim
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D002126:Calcium Hydroxide / Q000494:pharmacology; D003738:Dental Cements / Q000494:pharmacology; D003804:Dentin / Q000737:chemistry / Q000187:drug effects*; D004058:Diffusion; D006171:Gutta-Percha / Q000494:pharmacology; D006801:Humans; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D006878:Hydroxides / Q000737:chemistry; D066298:In Vitro Techniques; D012387:Root Canal Filling Materials / Q000494:pharmacology*; D014092:Tooth Root
chemical_list: D003738:Dental Cements; D006878:Hydroxides; D012387:Root Canal Filling Materials; C465381:roeko seal; D006171:Gutta-Percha; C031356:hydroxide ion; D002126:Calcium Hydroxide