Solubility, pH change, and calcium ion release of low solubility endodontic mineral trioxide aggregate

Abstract

Background: Insolubility is the main requirement for ideal root end filling material to provide perfect sealing ability. Moreover, alkalinity and bioactivity provide great chance for tissues healing and remineralization. So, the aim of this work was to evaluate the chemical composition, solubility, pH change, and calcium ion release of recently introduced commercial mineral trioxide aggregate (MTA) endodontic repair cement (Harvard, Universal HandMix MTA) compared with ProRoot MTA repair material. Methods: Solubility was evaluated after 7-and 14-day immersion time of specimens in phosphate buffer saline solution (PBS); the mean weight loss was evaluated and solubility was calculated as a percentage of the weight loss. For assessment of pH change and calcium ion release polyethylene tubes filled with the materials were soaked in distilled water for 7 and 14 days. Measurement of pH change was done by analytical pH meter. Concentrations of calcium ion release were measured using inductively coupled plasma optical emission spectroscopy. Data were statistically analyzed by independent sample t test and paired sample t test at 5% significance level. Results: Harvard MTA endodontic cement showed significant lower solubility and higher pH values compared with that of ProRoot MTA. ProRoot MTA exhibited significant higher calcium ion release value after 14 days (P value ≤ 0.05). Conclusion: Harvard, Universal HandMix MTA repair cement with its different chemical composition; exhibits a low solubility with enhanced alkaline pH value compared to ProRoot MTA repair material.

Influence of nickel-titanium rotary systems with varying cross-sectional, pitch, and rotational speed on deflection and cyclic fatigue: a finite element analysis study

“…A convex triangle reveals a larger deflection value compared with the square cross-section. This shape reduces the contact point between the cross-sectional area of the file and the root canal wall, thus increasing the flexibility of the file [20]. Based on the analysis in the study, triangular cross-sections reduce flexural stiffness and stress by increasing the number of threads or reducing pitch.…”

“…Thus, it can be concluded that the greater the load, the greater deformation or deflection. This behavior affects the instrument's flexibility, whereas the instrument's shape is not deformed at the lower elastic limit [20]. The limit is recorded as the elasticity value before the device is broken [11].…”