Abstract
Objectives
All implants, bone and endodontic cements need to be sufficiently radiopaque to be able to be distinguished from neighbouring anatomical structures post-operatively. For this purpose, radiopacifying materials are added to the cements to render them sufficiently radiopaque. Bismuth oxide has been quite a popular choice of radiopacifier in endodontic materials. It has been shown to cause dental discoloration. The aim of this study was to develop, characterize and assess the properties of tricalcium silicate cement with alternative radiopacifiers, which are either inter-ground or sintered to the tricalcium silicate cement.
Methods
Custom-made endodontic cements based on tricalcium silicate and 20 % barium, calcium or strontium zirconate, which were either inter-ground or sintered at high temperatures, were produced. The set materials stored for 28 days in Hank’s balanced salt solution were characterized by scanning electron microscopy and X-ray diffraction analysis. Assessment of pH, leaching, interaction with physiological solution, radiopacity, setting time, compressive strength and material porosity were investigated. Mineral trioxide aggregate (MTA) Angelus was used as control.
Results
Addition of radiopacifying materials improved the radiopacity of the material. The sintered cements exhibited the formation of calcium zirconate together with the respective radiopacifier phase. All materials produced calcium hydroxide on hydration, which interacted with tissue fluids forming hydroxyapatite on the material surface. The physical properties of the tricalcium silicate-based cements were comparable to MTA Angelus.
Conclusions
A novel method of producing radiopaque tricalcium silicate-based cements was demonstrated. The novel materials exhibited properties, which were either comparable or else improved over the control.
Clinical relevance
The novel materials can be used to replace MTA for root-end filling, perforation repair and other clinical applications where MTA is indicated.
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Acknowledgments
The authors would like to thank Ing. James Camilleri and Dr. Glenn Cassar of the Department of Metallurgy and Materials Engineering, Faculty of Engineering, University of Malta, Malta, and Dr. Vincent Thiery of Ecole de Mines, Douai, France, for their technical expertise; ERDF (Malta) for the financing of the testing equipment through the project: “Developing an Interdisciplinary Material Testing and Rapid Prototyping R&D Facility” (Ref. no. 012); The Directorate for Lifelong Learning Ministry of Education and employment for offering the Strategic Educational Pathways Scholarship Scheme (STEPS) throughout the Master’s Programme; and to the Short Scientific Internship Grants (through the University of Malta, the French Embassy in Malta, CNRS and the Malta Council of Science and Technology).
Compliance with ethical standards
This article does not contain any studies with human participants or animals performed by any of the authors.
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The authors declare that they have no competing interests.
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Xuereb, M., Sorrentino, F., Damidot, D. et al. Development of novel tricalcium silicate-based endodontic cements with sintered radiopacifier phase. Clin Oral Invest 20, 967–982 (2016). https://doi.org/10.1007/s00784-015-1578-1
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DOI: https://doi.org/10.1007/s00784-015-1578-1