Results 151 to 160 of about 1,549,267 (194)

Contraction Stress Related to Degree of Conversion and Reaction Kinetics

Journal of Dental Research, 2002
Polymerization shrinkage of composites bonded to cavity preparations generates stress on the tooth/restoration interface. The purpose of this study was to verify the influence of degree of conversion and speed of polymerization reaction on contraction stress.
R R, Braga, J L, Ferracane
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The Mathematic Method of Membership Conversion from Degree of Coordinates to Degree of Points

2009 International Conference on Environmental Science and Information Application Technology, 2009
In any multi-indexes uncertainty decisions, if choosing membership function to describe the uncertainty of every space-index value about some status, it must meet membership degree conversion, which must solve the conversion from membership degree of coordinates to membership degree of points. But the present methods affect the credibility of result of
Kai-di Liu, Jin Wang, Yan-jun Pang, Jin Liu, Jun-hu Ruan   +4 more
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Effect of light curing protocol on degree of conversion of composites

Acta Odontologica Scandinavica, 2014
To evaluate the degree of conversion (DC) of two light-cured composites with different protocols of light curing.One hundred and ninety two specimens (n = 8) were prepared (5 mm × 2 mm) according to experimental groups: two composite resins (Filtek Supreme and four seasons); three light curing protocols [20 s with the tip of the light curing unit (LCU)
Anderson, Catelan, Maria do Carmo Aguiar Jordão, Mainardi, Giulliana Panfiglio, Soares, Adriano Fonseca, de Lima, Gláucia Maria Bovi, Ambrosano, Débora Alves Nunes Leite, Lima, Giselle Maria, Marchi, Flávio Henrique Baggio, Aguiar   +7 more
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Degree of vinyl conversion in experimental ACP composites

2008
A unique amorphous calcium phosphate (ACP)-based composite with the potential to arrest caries development and regenerate mineral-deficient tooth structures has recently been developed. When embedded in polymerized methacrylate matrices and exposed to an aqueous environment, ACP releases sufficient levels of remineralizing calcium and phosphate ions in
Škrtić, Drago, Prskalo, Katica, Musić, Svetozar, Tarle, Zrinka, Ristić, Mira, Knežević, Alena   +5 more
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Degree of Conversion of Three Light-Cured Orthodontic Adhesives

Key Engineering Materials, 2018
Introduction: The aim of this in-vitro study was to analyze the polymerization ability of 3 light-cured orthodontic adhesives by determining the degree of conversion (DC). Materials and Methods: Fourier transform infrared spectroscopy (FTIR) was used to evaluate the DC after polymerization immediately, 1 day, 7 days, and 30 days.
Wassana Wichai, Kanin Nimcharoensuk, Niwat Anuwongnukroh, Surachai Dechkunakorn, Pitchaya Roongrujimek   +4 more
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Degree of Conversion of Experimental Light-Cured Orthodontic Adhesives

Key Engineering Materials, 2019
The objectives of this study were to compare the polymerization of three experimental light-cured orthodontic adhesives by determining their degree of conversion (DOC) and to compare the results with a control (Transbond XT; 3M Unitek, USA). Three formulas of an in-house orthodontic adhesive were divided according to monomer ratio (BisGMA:TEGDMA) into ...
Kanin Nimcharoensuk, Niwat Anuwongnukroh, Surachai Dechkunakorn, Vanthana Sattabanasuk, Panya Sunintaboon, Wassana Wichai   +5 more
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Polymerization of aromatic methacrylates to high degrees of conversion

Die Makromolekulare Chemie, 1983
AbstractPolymerizations of 2,4,6‐tribromophenyl methacrylate (1a), p‐tolyl methacrylate (1b), p‐cyclohexylphenyl methacrylate (1c), and p‐methoxyphenyl methacrylate (1d) were carried out up to conversions higher than 99%. The kinetics of the process was followed by the refractometric technique using a He‐Ne laser as light source.
Stefan Połowiński, Sylvia Tarkowska
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Changes in Degree of Conversion and Microhardness of Dental Resin Cements

Operative Dentistry, 2010
SUMMARY There are few studies available on the post-light activation or post-mix polymerization of dental resin cements as a function of time. This in vitro study evaluated the successive changes in the degree of conversion (DC) and microhardness during polymerization of six commercial resin cements (light-cured [Choice 2, RelyX Veneer ...
Yong Li, Yan, Young Kyung, Kim, Kyo-Han, Kim, Tae-Yub, Kwon   +3 more
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Effect of Polymer Degree of Conversion on Streptococcus mutans Biofilms

Macromolecular Bioscience, 2012
AbstractBiofilm–material interactions are increasingly recognized as critical to success of some materials/devices and failure of others. We use a model system of dental monomers, salivary pellicles, and oral biofilms to demonstrate for the first time that degree of conversion of cross‐linked dimethacrylate polymers alters biofilm metabolic activity ...
Alison M, Kraigsley, Kathy, Tang, Katrice A, Lippa, John A, Howarter, Sheng, Lin-Gibson, Nancy J, Lin   +5 more
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Polymerization kinetics of oligoesteracrylates at high degrees of conversion

Polymer Science U.S.S.R., 1967
IF [1, 2] IT was reported tha t the polymerization kinetics of oligoesteracrylates t (OEA) is a diffusion-controlled process even at low degrees of conversion (G< 1%). At these G the influence of the physical properties (viscosity) of the reaction system on the apparent reactivity of OEA consists mainly in the recombination of polymer radicals, the ...
G.V. Korolev, B.R. Smirnov, L.A. Zhil'tsova, L.I. Makhonina, N.N. Tvorogov, A.A. Berlin   +5 more
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