Physicochemical properties of radiopaque dicalcium silicate cement as a root-end filling material in an acidic environment

• Published in: International endodontic journal 2013-03, Vol.46 (3), p.234-241
• Main Authors: Chiang, T. Y., Ding, S. J.
• Format: Article
• Language: English
• Subjects: Apatites - chemistry; Calcium Chloride; Calcium Compounds - chemistry; calcium silicate cement; Chemical Phenomena; Contrast Media - chemistry; Dentistry; Humans; Hydrochloric Acid - chemistry; Hydrogen-Ion Concentration; Immersion; Magnesium Chloride - chemistry; Materials Testing; Methylamines - chemistry; mineral trioxide aggregate; Particle Size; Phosphates - chemistry; physicochemical properties; Porosity; Potassium Chloride - chemistry; Potassium Compounds - chemistry; Retrograde Obturation - methods; Root Canal Filling Materials - chemistry; root-end filling material; Silicate Cement - chemistry; Silicates - chemistry; Sodium Bicarbonate - chemistry; Sodium Chloride - chemistry; Stress, Mechanical; Sulfates - chemistry; Surface Properties; Tensile Strength; Time Factors
• ISSN: 0143-2885; 1365-2591
• DOI: 10.1111/j.1365-2591.2012.02112.x

Aim To investigate the effect of two solutions differing by pH (7.4 and 4.0) on the physicochemical properties of a radiopaque dicalcium silicate cement. Methodology The cement was prepared by hand‐mixing the dicalcium silicate powder with distilled water in a liquid‐to‐powder ratio of 0.4 mL g−1. A total of 253 cement specimens with dimension of 6 mm (diameter) × 3 mm (height) were used. The morphology, weight loss, porosity and diametral tensile strength of the cement were evaluated after soaking in a solution for different time intervals, in addition to pH changes in the cement‐immersed solutions. Results After soaking in a pH 7.4 solution for 1 day, the particle size of precipitated apatite spherulites on the cement surfaces was greater than that obtained in a pH 4.0 solution. Solution pH did not result in a significant difference (P > 0.05) in diametral tensile strength of cement specimens at the same soaking time‐point. On day 30, the sample was associated with a weight loss of 0.8% in a pH 4.0 solution, whereas in a pH 7.4 solution, a weight increase of 0.2% occurred. A greater porosity of the cement soaked in a pH 4.0 was found compared with that in the solution with pH 7.4. Soaking time affected significantly (P