Chemical, physical and mechanical properties of a novel calcium aluminate endodontic cement.
Summary of "Chemical, physical and mechanical properties of a novel calcium aluminate endodontic cement."
Oliveira IR, Pandolfelli VC, Jacobovitz M. Chemical, physical and mechanical properties of a novel calcium aluminate endodontic cement. International Endodontic Journal. Abstract Aim To evaluate the influence of additives on several physical and chemical properties of a novel endodontic cement based on calcium aluminate in comparison with mineral trioxide aggregate (MTA). Methodology Manipulation tests, measurements of temperature, pH, ionic conductivity, compressive strength, apparent porosity, and pore size distribution were carried out on Gray-MTA (Angelus) and calcium aluminate cement (Secar-71, Kerneos) with and without various additives: a polymeric dispersant, CaCl(2) as plasticizer, and ZnO as radiopacifier. Results The calcium aluminate cement without additives had a setting time of approximately 60 min, and when combined with Li(2)CO(3) it decreased to 10 min. The material also released Ca(2+) ions and alkalinized the medium. Moreover, the addition of additives (dispersant, plasticizer, and radiopacifier) improved its properties resulting in a material with a viscosity of 57 mPa s, enhanced handling properties, a mechanical strength of 81 MPa, a porosity of 4% and pores with small diameter (0.25 mum). MTA had no temperature increase (that indicates setting) up to 400 min, a mechanical strength of 34 MPa, and porosity of 28% with pores 2.5 mum in diameter. Conclusion The novel cement set more rapidly, had better fluidity, improved handling properties, higher mechanical strength, and reduced porosity with lower pore size compared to Gray-MTA Angelus.
Institute for Research and Development, University of Vale do Paraiba, São José dos Campos, SP.
This article was published in the following journal.
Name: International endodontic journal
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20726916
- DOI: http://dx.doi.org/10.1111/j.1365-2591.2010.01770.x
A common technique for small-scale isolation of genomic DNA is via adsorption of the DNA molecules onto a silica scaffold. In this work, the isolation capacities of calcium aluminate based glasses wer...
The purpose of the study was to evaluate human dental pulp response to pulpotomy with calcium hydroxide (CH), mineral trioxide aggregate (MTA), and calcium enriched mixture (CEM) cement.
Premixed calcium phosphate cements can reduce handling complications that are associated with the mixing of cements in the operating room. However, to extend the clinical indication of ceramic cements...
With growing concern over bacterial resistance, the identification of new antimicrobial means is paramount. In the oral cavity microorganisms are essential to the development of periradicular diseases...
The focus of this study is to investigate the effect of Al2O3 on α-calcium silicate (α-CaSiO3) ceramic. α-CaSiO3 was synthesized from CaO and SiO2 using mechanochemical method followed by calcinati...
The purpose of this study is to measure the mechanical properties of healing Achilles tendons in humans after early controlled weightbearing, compared with a control group in a randomized,...
It has been suggested that dietary fibers can affect food intake and satiation. Satiation, or meal termination, can be induced by sensory properties and energy density of fiber-rich food p...
Doctors recommend that young children participate in daily physical activity to promote bone health. However, studies in adults show that physical activity and increased calcium intake cau...
The study is designed to test the hypothesis that there is a difference in healing kinetics and healing rate between teeth treated by conventional endodontic procedure alone and those in w...
Of the ~700,000 persons who suffer a stroke each year, only 50% recover the ability to perform unlimited community walking. One mechanism contributing to locomotor dysfunction post-stroke...
Medical and Biotech [MESH] Definitions
Substances used in biomedicine or dentistry predominantly for their physical, as opposed to chemical, properties.
The study of the physical and chemical properties of a drug and its dosage form as related to the onset, duration, and intensity of its action.
A genus of HALOBACTERIACEAE which are chemoorganotrophic and strictly aerobic. They have been isolated from multiple hypersaline environments that vary widely in chemical and physical properties.
A medical specialty concerned with the use of physical agents, mechanical apparatus, and manipulation in rehabilitating physically diseased or injured patients.
A fluorescent calcium chelating agent which is used to study intracellular calcium in many tissues. The fluorescent and chelating properties of Fura-2 aid in the quantitation of endothelial cell injury, in monitoring ATP-dependent calcium uptake by membrane vesicles, and in the determination of the relationship between cytoplasmic free calcium and oxidase activation in rat neutrophils.