Results 171 to 180 of about 3,724 (225)

Sealing quality of instruments cemented in root canals with polycarboxylate cements

Journal of Endodontics, 1975
Stainless steel files were cemented in place as the master cone with Durelon, PCA, and Proco-sol. The treated teeth were immersed in, dye; after 2, 4, 8, and 16 days, they were examined for evidence of dye penetration. The depth of dye penetration for each group was compared with the use of the t test.
G N, Barry, R A, Heyman, I L, Fried
openaire   +2 more sources

Effect of manipulative variables on the properties of a polycarboxylate cement*

Australian Dental Journal, 1975
Abstract— Strength and film thickness increased in polycarboxylate cement as the powder liquid ratio is increased and there is a tendency to reduction in adhesion which was more marked when cementation was delayed for three minutes with a 2:1 powder liquid ratio.
M C, Kafalias, M L, Swartz, R W, Phillips   +2 more
openaire   +2 more sources

The nature of the zinc polycarboxylate cement matrix

Journal of Biomedical Materials Research, 1982
AbstractThe matrix of a stoichiometric zinc polycarboxylate cement has been shown to be identical with zinc polycarboxylate salt, which consists principally of neutralized carboxylate groups with a few free acid groups. When excess zinc oxide is present, as in practical cements, there are no free acid groups present.
openaire   +2 more sources

Reinforced polycarboxylate cements.

Journal of dental research, 1975
Mechanical properties of polycarboxylate cements are greatly improved by incorporation of high modulus fibers such as potassium titanate into acrylic-itaconic acid and acrylic-itaconic-acronitic acid copolymers. Other desirable properties of the cements are not changed by the addition of fibers.
J A, Barton, G M, Brauer, J M, Antonucci, M J, Raney   +3 more
openaire   +1 more source

Application of polycarboxylate in low cement castables

Materials Research Innovations, 2015
The performance of low cement castable with polycarboxylate was studied by comparing the effects of polycarboxylate superplasticisers KS-JS70 and LMS-P and sodium tripolyphosphate on castable samples. The fluidity, bulk density, apparent porosity, compressive strength and bending strength of the castable samples at room temperature were determined, and
T. S. He, Z. K. Li
openaire   +1 more source

The rheological properties of polyelectrolyte cements

Journal of Oral Rehabilitation, 1981
SummaryThe rheological behaviour of six setting carboxylate cements was studied by capillary techniques in the shear rate of 0.65–65 s−1 and the cements were found to behave as power law fluids. All cements became dilatant as setting progressed and the kinetics of apparent viscosity increase, were found to follow an exponential function of time, exp ...
Combe, E.C., Watts, D.C.; id_orcid 0000-0002-9105-2775, Greener, E.H.   +2 more
openaire   +4 more sources

The compatibility of polycarboxylate-type superplasticizers with cement

Journal of Wuhan University of Technology-Mater. Sci. Ed., 2005
Four polycarboxylate-type (PC) superplasticizers of different functional groups were used; their dispersing and retaining behaviors were analyzed through ZETA potential measurement, mini-slump test of cement paste and performance test of concrete. The experimental results show that the dispersing and flow-retaining ability of PC was determined by two ...
Li Chongzhi, Wang Dongmin, Song Shaomin, Chen Jialong   +3 more
openaire   +1 more source

Polycarboxylate Polymers and Blends in Different Cements

Cement, Concrete, and Aggregates, 2004
Abstract During the last few years, polycarboxylate based polymers have become very popular. They contain a polycarboxylic backbone onto which ethyleneoxide side chains have been grafted. However its dispersing and slump keeping properties vary significantly, depending on the chemical structure.
U Mäder, I Schober, F Wombacher, D Ludirdja   +3 more
openaire   +1 more source

Bond strength of polycarboxylic acid cements to treated dentine

Dental Materials, 1985
Abstract The effect of some dentine surface pretreatments proposed in the literature to enhance the bond strengths of one or more polycarboxylic acid cements, has been examined. Few of these pretreatments have been independently investigated. The bond strengths of two polycarboxylic acid cements, one of which contained SnF2, and a glass-ionomer ...
D R, Beech, A, Solomon, R, Bernier
openaire   +2 more sources

Compatibility of polycarboxylate superplasticizers with cements

2006
Superplasticizers are nowadays often used for ready-mix concrete, but also for other purposes in concrete technology. In most cases, without adding a superplasticizer to concrete, it is not possible to achieve the desired properties of fresh and hardened concrete. Properties of fresh concrete, such as slump, slump loss with time, segregation, bleeding,
Štirmer, Nina, Banjad Pečur, Ivana
openaire   +1 more source