scholarly journals Effect of diphenyliodonium hexafluorphosphate in the yellowing and properties of experimental resin cements

2019 ◽  
Vol 18 ◽  
pp. e191591
Author(s):  
Kamila Menezes Guedes de Andrade ◽  
Caroline Mathias ◽  
Hugo Felipe do Vale ◽  
Flávio Henrique Baggio Aguiar ◽  
Giselle Maria Marchi
Keyword(s):  
Water Sorption ◽  
Triethylene Glycol ◽  
Ethyl Benzoate ◽  
Dental Restoration ◽  
Glycol Dimethacrylate ◽  
Color Analysis ◽  
Resin Cements ◽  
Triethylene Glycol Dimethacrylate ◽  
B Values ◽  
Glass Fillers

Aim: The yellowing effect is undesirable and can occur in the dental restoration margins when light-cured resin cements containing camphorquinone as photoinitiator is used. This study aimed to evaluate the effect of diphenyliodonium hexafluorphosphate (DPI) in photoinitiator systems that contained different concentrations of camphorquinone (CQ) and dimethylamino ethyl benzoate (EDAB) on resin cements. Methods: A base (1:1) of bisphenol A diglycidyl methacrylate (BisGMA) and triethylene glycol dimethacrylate (TEGDMA) was obtained, and 60wt% of glass fillers was added. Eight formulations were obtained: RC1 (0.5mol% CQ / 1mol% EDAB), RC2 (0.5mol% CQ / 2mol% EDAB), RC3 (1mol% CQ / 1mol% EDAB), RC4 (1mol% CQ / 2mol% EDAB), and RC5 to RC8, which contained the same bases plus 0.5mol% DPI. Experimental resin cements were evaluated by the degree of conversion (DC), L*a*b* color analysis, water sorption (WS) and solubility (S), flexural strength, and Elastic Modulus. The data were analyzed by three-way ANOVA, Tukey’s and Mann-Whitney tests (α = 0.05). Results: The combination of DPI and 0.5mol% CQ increased DC in RC6 and L* in RC5 without increasing the WS and a* b* values. CQ at 1mol% showed higher values of b* and lower values of a*, except for RC3. Groups with 2mol% EDAB showed higher DC. Conclusion: The addition of DPI reduces CQ, generating a decreased yellowing effect, while maintaining adequate properties in the resin cements, especially with 2mol% EDAB.

A triethylene glycol dimethacrylate- free dental composite for reduced water-sorption and shrinkage

2017 ◽  
Vol 52 (12) ◽  
pp. 1579-1588 ◽  
Author(s):  
Yuling Xu ◽  
Dong Xie
Keyword(s):  
Water Sorption ◽  
Triethylene Glycol ◽  
Dental Composite ◽  
Dental Composites ◽  
Screen Tool ◽  
Glycol Dimethacrylate ◽  
Triethylene Glycol Dimethacrylate ◽  
Commercial Resin ◽  
Urethane Dimethacrylate ◽  
Reduced Water

A number of new liquid urethane-based oligomers were synthesized, characterized and used to formulate the dental composites. Compressive strength and viscosity were used as a screen tool to evaluate the formed composites. Commercial available bisphenol A glycidyl methacrylate and urethane dimethacrylate-based systems were used as controls. Degree of conversion, shrinkage, water-sorption, solubility, flexural strength and diametrial tensile strength were evaluated. The results show that using mixed acrylate/methacrylate or methacrylates with different length to derivatize diisocyanates could be a good strategy to synthesize urethane-based oligomers in a liquid state. The developed triethylene glycol dimethacrylate-free urethane-based composites showed significantly reduced water sorption and solubility, decreased shrinkage and enhanced mechanical strength as compared to commercial resin-based ones.

Development of Branching in Atom Transfer Radical Copolymerization of Styrene with Triethylene Glycol Dimethacrylate

2009 ◽  
Vol 42 (16) ◽  
pp. 5976-5982 ◽  
Author(s):  
Hong-Jun Yang ◽  
Bi-Biao Jiang ◽  
Wen-Yan Huang ◽  
Dong-Liang Zhang ◽  
Li-Zhi Kong ◽  
...  
Keyword(s):  
Triethylene Glycol ◽  
Radical Copolymerization ◽  
Atom Transfer ◽  
Glycol Dimethacrylate ◽  
Triethylene Glycol Dimethacrylate

scholarly journals Synthesis and research of photocurable protective coatings on the basis of olygoesteracrylates

2020 ◽  
Vol 7 (4) ◽  
pp. 229-232
Author(s):  
O. A. Karsakova ◽  
M. V. Kuzmin
Keyword(s):  
Mechanical Properties ◽  
Polyethylene Glycol ◽  
Methacrylic Acid ◽  
Protective Coatings ◽  
Physical And Mechanical Properties ◽  
Triethylene Glycol ◽  
Glycol Dimethacrylate ◽  
Triethylene Glycol Dimethacrylate ◽  
Rotary Viscometer ◽  
Acid Esters

In this work, photocurable protective coatings based on methacrylic acid esters have been developed and their physical and mechanical properties have been investigated. The photocurable compositions were obtained by mixing at different ratios the following methacrylic acid esters: polyethylene glycol dimethacrylate 400 and triethylene glycol dimethacrylate ether, polyethylene glycol dimethacrylate 400 and oligourethane dimethacrylate, polyethylene glycol dimethacrylate 400 and pentaerythritol tetraacrylate. For the obtained compositions, the viscosity was studied using a Brookfield rotary viscometer. To initiate polymerization, a mixture of initiators was used: benzoyl peroxide and benzoin. Curing of the obtained compositions was carried out under the influence of UV rays for 2-5 minutes. For photo-cured compositions, their physical and mechanical properties have been studied. It was found that the composition based on polyethylene glycol dimethacrylate modified with triethylene glycol dimethacrylate at a ratio of 70:30 has the highest strength.

Nanoporous Polymer Networks of N-Vinylpyrrolidone with Triethylene Glycol Dimethacrylate and Sorption of Macromolecules

2019 ◽  
Vol 61 (2) ◽  
pp. 186-193 ◽  
Author(s):  
S. V. Kurmaz ◽  
N. V. Fadeeva ◽  
A. A. Grishchuk ◽  
E. I. Knerel’man ◽  
G. I. Davydova
Keyword(s):  
Polymer Networks ◽  
Triethylene Glycol ◽  
Glycol Dimethacrylate ◽  
Triethylene Glycol Dimethacrylate
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