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An in vitro study of the pH of three calcium hydroxide dressing materials
Author(s) -
Zmener Osvaldo,
Pameijer Cornelis H.,
Banegas Gladys
Publication year - 2007
Publication title -
dental traumatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 81
eISSN - 1600-9657
pISSN - 1600-4469
DOI - 10.1111/j.1600-9657.2005.00447.x
Subject(s) - calcium hydroxide , distilled water , chemistry , alkalinity , calcium , nuclear chemistry , hydroxide , root canal , chromatography , dentistry , inorganic chemistry , organic chemistry , medicine
– Calcium hydroxide is widely used as a root canal dressing material because of its favorable alkalinizing effect. It has been suggested that the action comes from diffusion of hydroxyl ions through the apical foramen. The purpose of this in vitro study was to test the pH changes that occurred over a period of 30 days using a mixture of calcium hydroxide and distilled water and two commercial calcium hydroxide products in a simulated periapical environment. The materials were inserted in glass tubes closed at one end, which were placed in individual vials containing distilled water at a pH 7.4. Unfilled glass tubes were used as controls. Alkalinity changes of the medium were measured at 1 and 24 h and 15 and 30 days. The alkalinizing properties of all materials showed a rapid increase at 1 and 24 h followed by a continuous but more gradual increase from 15 to 30 days. The control tubes did not cause a change in pH of the medium, which remained at pH 7.4. At the end of the observation period, the alkalinizing properties of Calasept and Ultracal XS were significantly higher ( P < 0.05) than the calcium hydroxide/distilled water paste.