Ion release and mechanical properties of calcium silicate and calcium hydroxide materials used for pulp capping




To compare the ion release and mechanical properties of a calcium hydroxide (Dycal) and two calcium silicate (MTA Angelus and Biodentine) cements.


Calcium and hydroxyl ion release in water from 24-h set cements were calculated from titration with HCl (n=3). Calcium release after 7, 14, 21 and 28 days at pH 5.5 and 7.0 was measured using ICP-OES (n=6). Flexural strength (FS) and modulus (E) were tested after 48-h storage and compressive strength (CS) was tested after 48 h and 7 days (n=10). Ion release and mechanical data were subjected to ANOVA/Tukey and Kruskal-Wallis/Mann-Whitney tests, respectively (α=0.05).


Titration curves revealed that Dycal released significantly fewer ions in solution than calcium silicates (p<0 .001="" 21="" 24="" 5.5="" 7.0="" after="" and="" angelus="" at="" biodentine="" by="" calcium="" cements="" compressive="" constant="" days="" dropped="" dycal="" flexural="" had="" higher="" ion="" it="" modulus="" more="" mta="" other="" p="" ph="" release="" released="" remained="" significantly="" strength="" superior="" than="" the="" while="">


Immediate calcium and hydroxyl ion release in solution was significantly lower for Dycal. In general, all materials released constant calcium levels over 28 days, but release from Dycal was significantly lower than Biodentine and MTA Angelus depending on pH conditions. Biodentine had substantially higher strength and modulus than MTA Angelus and Dycal, both of which demonstrated low stress bearing capabilities.


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