Physical and chemical properties of experimental mixture of mineral trioxide aggregate and glass ionomer cement

Abstract

Objectives:The purpose of this study was to determine the setting time, compressive strength, solubility, and pH of mineral trioxide aggregate (MTA) mixed with glass ionomer cement (GIC) and to compare these properties with those of MTA, GIC, IRM, and SuperEBA. Materials and Methods: Setting time, compressive strength, and solubility were determined according to the ISO 9917 or 6876 method. The pH of the test materials was determined using a pH meter with specified electrode for solid specimen. Results: The setting time of MTA mixed with GIC was significantly shorter than that of MTA. Compressive strength of MTA mixed with GIC was significantly lower than that of other materials at all time points for 7 days. Solubility of 1 : 1 and 2 : 1 specimen from MTA mixed with GIC was significantly higher than that of other materials. Solubility of 1 : 2 specimen was similar to that of MTA. The pH of MTA mixed with GIC was 2-4 immediately after mixing and increased to 5-7 after 1 day. Conclusions: The setting time of MTA mixed with GIC was improved compared with MTA. However, other properties such as compressive strength and pH proved to be inferior to those of MTA. To be clinically feasible, further investigation is necessary to find the proper mixing ratio in order to improve the drawbacks of MTA without impairing the pre-existing advantages and to assess the biocompatibility. [J Kor Acad Cons Dent 2010;35(5):344-352.]

Synthesis and Properties of a New Dental Material Based on Nano‐Structured Highly Active Calcium Silicates and Calcium Carbonates

“…In our case, the increased rate of setting time was dominantly caused by very small particles and crystallite sizes. Due to nanometric values of crystallite sizes (preferentially of calcium silicate phases), the setting time of our sample was significantly shorter, in comparison with data for MTA and Portland cement, found in literature …”

“…In the case of our new product ALBO‐MPCA, these values were 20 min for initial set time, while setting time was 50 min. ALBO‐MPCA evidently shows much better setting properties in comparison with Portland cement and MTA …”

“…ALBO-MPCA evidently shows much better setting properties in comparison with Portland cement and MTA. 12 As it is well-known, phase composition and grain sizes of binder phases have the prevailing influence on the setting time of the given mixture. In our case, the increased rate of setting time was dominantly caused by very small particles and crystallite sizes.…”

Endodontic management of a maxillary lateral incisor with dens invaginatus and external root irregularity using cone-beam computed tomography

“…The reports of Main et al confirm the superiority of MTA as a perforation repair material. [14][15][16][17] In our case, we used white MTA to repair the perforation, because of the potential discoloration effect of gray MTA. According to Asgary et al, the major difference between white MTA and gray MTA appears to be in the concentrations of carborundum, periclase, and especially ferrous oxide.…”

Evaluation of the effect of blood contamination on the compressive strength of MTA modified with hydration accelerators

“…In addition, Nekoofar et al demonstrated that blood contamination influenced the development of MTA crystals and decreased its surface microhardness and compressive strength 3-5. It is well known that another disadvantage of MTA is its extended setting time 6-10…”