Effect of additives on the compressive strength and setting time of a Portland cement

Brazilian Oral Research
Desirée Freitas Mryczka MachadoRodrigo Nunes Rached

Abstract

Improvements in strength and setting time of Portland cements (PC) are needed to enhance their performance as endodontic and load bearing materials. This study sought to enhance the compressive strength and setting time of a PC by adding one of the following additives: 20% and 30% poly-methylmethacrylate (PMMA), 20% and 30% irregular and spherical amalgam alloys, and 10% CaCl(2). The control consisted of unreinforced PC specimens. Setting time was determined using a Gillmore apparatus according to standardized methods while compressive strength was measured using a universal testing machine after 21 hours or 60 days of water storage. Data were analyzed by ANOVA, Tukey and Games-Howell tests (alpha = 5%). All additives significantly decreased both initial and final setting times as compared with the PC-control (p < .05). 30% PMMA and 30% irregular alloy had the lowest values of initial setting time. 30% irregular alloy also produced the lowest values of final setting time while 30% spherical alloy yielded the highest (p < .05). No differences were detected between the compressive strength values of 21 hours and 60 days. While 10% CaCl(2), 20% and 30% PMMA produced values significantly lower than the PC-control, 30% spherical all...Continue Reading

References

Jan 1, 1972·Journal of Dental Research·S CivjanL S Waddell
Jul 1, 1995·Journal of Endodontics·M TorabinejadT R Pitt Ford
Dec 1, 1993·Journal of Endodontics·M TorabinejadT R Pitt Ford
Feb 18, 1999·Biomaterials·P J MitchellF McDonald
Mar 2, 1999·The Journal of Prosthetic Dentistry·D M WongR K Clark
Aug 7, 2002·Biomaterials·D AbdullahF McDonald
Mar 16, 2005·Dental Materials : Official Publication of the Academy of Dental Materials·Josette CamilleriThomas R Pitt Ford
Aug 11, 2005·Brazilian Oral Research·Cecília Luiz PereiraFlávio Fernando Demarco
Oct 13, 2005·International Endodontic Journal·J CamilleriT R Pitt Ford
Oct 14, 2005·Dental Materials : Official Publication of the Academy of Dental Materials·Josette CamilleriThomas R Pitt Ford
Nov 26, 2005·Brazilian Oral Research·Daniel Araki RibeiroDaisy Maria Favero Salvadori
Mar 15, 2006·Journal of Hazardous Materials·Rachana Malviya, Rubina Chaudhary
May 27, 2006·Journal of Endodontics·Paul KoganIkuya Watanabe
Nov 23, 2006·Brazilian Oral Research·André Luiz Fraga BrisoEloi Dezan Junior
Sep 25, 2007·Journal of Endodontics·Benjamin S BerGregory P Stewart

❮ Previous
Next ❯

Citations

Apr 22, 2014·Indian Journal of Dental Research : Official Publication of Indian Society for Dental Research·S PrakasamB Krishna Prasanth
Nov 26, 2015·Journal of the Mechanical Behavior of Biomedical Materials·Luiz E BertassoniMichael V Swain
Jun 13, 2015·Journal of Conservative Dentistry : JCD·Anushree PrasadRamamurthy Sujatha
Jan 21, 2021·Journal of Colloid and Interface Science·Naji KharoufVincent Ball

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.