Related Experiment Video
Updated: Aug 12, 2025

Expression of Cementitious Pore Solution and the Analysis of Its Chemical Composition and Resistivity Using X-ray Fluorescence
Published on: September 23, 2018
Theoretical method for a radiopacifier proportion calculation in MTA type cements
Yoshamin Abnoba Moreno-Vargas1, Abigailt Flores-Ledesma2, Jacqueline Adelina Rodríguez-Chavez3
1Facultad de Odontología, Universidad Nacional Autónoma de México; Laboratorio de Cristalofísica y Materiales Naturales, Circuito de la Investigación s/n, Ciudad Universitaria.
Abstract:
This article deals with the problem of determining the proportion by weight of radiopacifying material needed to add to a cement clinker of mineral trioxide aggregated (CE) to comply with ISO 6876/2001 and ANSI-ADA 57 regulations for radiopacity. With this aim, CE was synthesized and mixed experimentally with 5, 10, 15, and 20 wt% of ZrO2 as radiopacifying material. Radiographic images were taken so that radiographic density was obtained and related to the mmAl scale by using an aluminum step wedge. From a theoretical point of view, absorbed intensity given by the Lambert-Beer law was calculated using mass attenuation coefficients (NIST database) for each chemical element included in each component of the cement samples. In this way, we predicted that by adding above 10 wt% of ZrO2 to the CE, the requirements stipulated by ISO 6876 for radiopacity were satisfied with discrepancies around 1 mmAl. This theoretical method gives an excellent approximation to determine the amount of radiopacifying material needed to meet the requirements stipulated by ISO.
More Related Videos
06:27Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
Published on: September 12, 2019
06:20Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Related Concept Videos
Aggregate Cement Ratio
Porosity in Cement Paste
The balance of water to cement in the mix is...
Measurement of Air Content in Concrete
The pressure method,...
Water Cement Ratio
Fineness of Cement
Direct...
Hydration of Cement