Abstract
BackgroundThis study examined the effects of addition of 10% and 25% by weight calcium hydroxide on the physicochemical properties of Portland cement associated with 20% bismuth oxide in order to develop a new pulp capping material.Material and MethodsThe solubility, pH value, setting time, compressive strength, and push out bond strength of modified Portland were evaluated and compared to those of mineral trioxide aggregate (MTA) and Portland cement containing 20% bismuth oxide.ResultsThe statistical analysis was performed with ANOVA and Duncan’s post-hoc test. The results show that the strength properties and push out bond strength of Portland cement were adversely affected by addition of calcium hydroxide especially with a ratio of 25 wt%, however, the setting time and pH were not affected. MTA showed a statistically significant lower setting time than other cements (P≤0.001). Portland cement with bismuth oxide and Port Cal I showed a statistically significant higher Push out Bond strength than MTA and Port Cal II (P=0.001).ConclusionsTaking the setting time, push out bond strength and pH value into account, addition of 10 wt% calcium hydroxide to Portland cement associated with 20% bismuth oxide produces a new pulp capping material with acceptable physical and adhesive properties. Further studies are recommended to test this cement biologically as a new pulp capping material. Key words:Calcium hydroxide, MTA, Portland cement, setting time, solubility, strength.
Highlights
Pulp capping is defined as the treatment of exposed vital pulp by the application of capping materials to induce the dentinogenic potential of pulp cells [1]
Means and standard deviations (SD) of setting times (Min), compressive strength (MPa) after 24 hours and 21 days, diametral tensile strength (MPa) after 24 hours and 21 days and Push out Bond strength (MPa) for the different materials are presented in table 1. -Mean setting time (Min): Initial setting time Means and standard deviations (SD) of initial setting time (Min) for the different materials are presented in table 1
No significant difference was recorded between other materials. Final setting time Means and standard deviations (SD) of final setting time (Min) for the different materials are presented in table 1
Summary
Pulp capping is defined as the treatment of exposed vital pulp by the application of capping materials to induce the dentinogenic potential of pulp cells [1]. The aim of present part of the study was to evaluate the physicochemical properties of Portland cement associated with bismuth oxide and calcium hydroxide in an attempt to develop a new pulp capping material. -Standardization of the setting time of the cements: The experimental cements were mixed according to the predetermined powder/water ratio.
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