scholarly journals DEGREE OF POLYMERIZATION OF DUAL CURE RESIN CEMENT MEASURED BY FTIR

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Aleksandra Maletin ◽  
Dubravka Marković ◽  
Isidora Nešković ◽  
Branislava Petronijević ◽  
Tanja Veljović ◽  
...  
Keyword(s):  
Clinical Success ◽  
Triethylene Glycol ◽  
Mean Value ◽  
Degree Of Polymerization ◽  
Resin Cement ◽  
Polymerization Reaction ◽  
Dental Resin ◽  
Triethylene Glycol Dimethacrylate ◽  
High Degree

Introduction: The degree of polymerization of dental resin cement materi- als is very important for the longevity and quality of the clinical success of the restorative procedure. Insufficiently effective polymerization reaction of dental resin cement materials may result in adverse effects on the mechanical and adhesive performance of the material. It is believed that the proportion of triethylene glycol dimethacrylate (TEGDMA) mono- mers in the chemical structure of the material significantly influences the polymerization reaction. With the increase in TEGDMA, the degree of conversion of monomers into the polymer increases. Aim: The aim of this study has been to determine the degree of polymerization of dual cure dental resin cement. Material and methods: For the analysis of the degree of polymerization, Fourier transform infrared (FTIR) spectroscopy was used. 10 samples of dual cure resin based cement Variolink II were prepared in accordance with the manufacturer's instructions. Analysis was performed 24 hours after polymerization procedure. Results: Degree of polymerization of Variolink II resin based cement ranged from 69.2% to 98.7% with a mean value of 85.81%. Conclusion: Variolink II dual cure resin cement contains a significant percentage of TEGDMA which can be the cause of high degree of polymerization. The minimum accep- table percentage of the degree of polymerization of dental resin cement has not yet been established.

scholarly journals A Low-Viscosity BisGMA Derivative for Resin Composites: Synthesis, Characterization, and Evaluation of Its Rheological Properties

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 338
Author(s):  
Ali Alrahlah ◽  
Abdel-Basit Al-Odayni ◽  
Haifa Fahad Al-Mutairi ◽  
Bashaer Mousa Almousa ◽  
Faisal S. Alsubaie ◽  
...  
Keyword(s):  
Substantial Reduction ◽  
Triethylene Glycol ◽  
High Viscosity ◽  
Resin Matrix ◽  
Resonance Spectroscopy ◽  
Dental Resin ◽  
Triethylene Glycol Dimethacrylate ◽  
Oh Groups ◽  
Low Viscosity ◽  
13C Nuclear Magnetic Resonance

This study aimed to synthesize new bisphenol A-glycidyl methacrylate (BisGMA) derivatives, targeting a reduction in its viscosity by substituting one of its OH groups, the leading cause of its high viscosity, with a chlorine atom. Hence, this monochloro-BisGMA (mCl-BisGMA) monomer was synthesized by Appel reaction procedure, and its structure was confirmed using Fourier transform infrared spectroscopy, 1H and 13C-nuclear magnetic resonance spectroscopy, and mass spectroscopy. The viscosity of mCl-BisGMA (8.3 Pa·s) was measured under rheometry conditions, and it was found to be more than 65-fold lower than that of BisGMA (566.1 Pa·s) at 25 °C. For the assessment of the viscosity changes of model resins in the presence of mCl-BisGMA, a series of resin matrices, in which, besides BisGMA, 50 wt % was triethylene glycol dimethacrylate, were prepared and evaluated at 20, 25, and 35 °C. Thus, BisGMA was incrementally replaced by 25% mCl-BisGMA to obtain TBC0, TBC25, TBC50, TBC75, and TBC100 blends. The viscosity decreased with temperature, and the mCl-BisGMA content in the resin mixture increased. The substantial reduction in the viscosity value of mCl-BisGMA compared with that of BisGMA may imply its potential use as a dental resin matrix, either alone or in combination with traditional monomers. However, the various properties of mCl-BisGMA-containing matrices should be evaluated.

scholarly journals Controlled Release of Chlorhexidine from UDMA-TEGDMA Resin

2006 ◽  
Vol 85 (10) ◽  
pp. 950-954 ◽  
Author(s):  
K.J. Anusavice ◽  
N.-Z. Zhang ◽  
C. Shen
Keyword(s):  
Triethylene Glycol ◽  
Filler Loading ◽  
Degree Of Polymerization ◽  
Fickian Diffusion ◽  
Release Mechanism ◽  
Glycol Dimethacrylate ◽  
Release Rates ◽  
Triethylene Glycol Dimethacrylate ◽  
Urethane Dimethacrylate ◽  
Dental Applications

Chlorhexidine salts are available in various formulations for dental applications. This study tested the hypothesis that the release of chlorhexidine from a urethane dimethacrylate and triethylene glycol dimethacrylate resin system can be effectively controlled by the chlorhexidine diacetate content and pH. The filler concentrations were 9.1, 23.1, or 33.3 wt%, and the filled resins were exposed to pH 4 and pH 6 acetate buffers. The results showed that Fickian diffusion was the dominant release mechanism. The rates of release were significantly higher in pH 4 buffer, which was attributed to the increase of chlorhexidine diacetate solubility at lower pH. The higher level of filler loading reduced the degree of polymerization, leading to a greater loss of organic components and higher chlorhexidine release rates.

scholarly journals Correlation between the degree of conversion and the elution of leachable components from dental resin-based cements

2011 ◽  
Vol 76 (9) ◽  
pp. 1307-1323 ◽  
Author(s):  
Kosovka Obradovic-Djuricic ◽  
Vesna Medic ◽  
Marina Radisic ◽  
Mila Lausevic
Keyword(s):  
Triethylene Glycol ◽  
Degree Of Conversion ◽  
Cement Matrix ◽  
Dental Resin ◽  
Resin Cements ◽  
Triethylene Glycol Dimethacrylate ◽  
Urethane Dimethacrylate ◽  
Post Hoc ◽  
Composite Cements ◽  
One Way Anova

This study examined the possible correlation between the degree of conversion (DC) and the amount of substances eluted from three commercial cured resin-based cements. The DC of the various resin-based cements was measured by Raman spectroscopy, while the quantity of unreacted monomers released from the cement matrix (triethylene glycol dimethacrylate, TEGDMA, urethane dimethacrylate, UDMA, 2- hydroxyethyl methacrylate, HEMA and bis phenol A) was determined by high pressure liquid chromatography (HPLC). The obtained results, after multiple statistical evaluation (one way ANOVA, LSD post hoc test), showed no significant differences in the DC values between the resin cements. On the contrary, the results of the HPLC analysis depicted statistically significant differences between the three materials with respect to the amount of leached monomers. In addition, no correlation between the DC and the amount of eluted substances from the tested cured composite cements was found.

Simulated Body Fluid Sorption and Solubility of Silica Reinforced Dental Resin Composites

2013 ◽  
Vol 795 ◽  
pp. 626-630 ◽  
Author(s):  
Saad Omar Alsharif ◽  
Md Akil Hazizan ◽  
Nasser Abbas Abd El-Aziz ◽  
Zainal Arifin Ahmad
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Resin Composite ◽  
Triethylene Glycol ◽  
Filler Loading ◽  
Resin Matrix ◽  
Resin Composites ◽  
Dental Resin ◽  
Triethylene Glycol Dimethacrylate ◽  
Dental Resin Composites

The aim of this study is to investigate the effect of filler loading on the sorption and solubility of Simulated Body Fluid (SBF) of self-prepared micro dental resin composites. The prepared resin composite was based on silica (SiO2) particles and bisphenol-a-glycidyl methacrylate (Bis-GMA) as a base monomer and triethylene glycol dimethacrylate (TEGDMA) as a co-monomer. The filler was mixed with monomers, in proportions of 40, 50 and 60 wt.%. A resin matrix containing 0 wt.% filler was used as the control composition to evaluate the effect of filler loading on the sorption and solubility of SBF. The experimental methods were based on the procedure mentioned in the ISO 4049 (2009) standard for dentistry-Polymer-based restorative Materials. The sorption and solubility of resin matrix/SiO2composite decreased gradually as the filler loading increased. The increase of filler loading showed significant differences in the sorption and solubility as tested by ANOVA (P= 0.000).

Influence of Silica and Zirconia Particles as Filler Loading on the Radiopacity of Dental Resin Composites

2012 ◽  
Vol 620 ◽  
pp. 345-349 ◽  
Author(s):  
Saad Omar Alsharif ◽  
Md Akil Hazizan ◽  
Nasser Abbas Abd El-Aziz ◽  
Zainal Arifin Ahmad
Keyword(s):  
Glycidyl Methacrylate ◽  
Triethylene Glycol ◽  
Filler Loading ◽  
Aluminum Plate ◽  
Resin Matrix ◽  
Resin Composites ◽  
Dental Resin ◽  
Triethylene Glycol Dimethacrylate ◽  
Dental Resin Composites ◽  
Base Resin

The aim of this study is to evaluate the radiopacity of silica (SiO2) and zirconia (ZrO2) particles dispersed in a bisphenol-a-glycidyl methacrylate (Bis-GMA) as a base resin and triethylene glycol dimethacrylate (TEGDMA) as a diluent. The fillers were mixed separately with bis-GMA/TEGDMA monomers, in proportions of 40, 50 and 60 wt.%. A resin matrix containing 0 wt.% filler was used as the control composition to evaluate the effect of filler loading on the radiopacity. Samples of the composites with 2.5 mm thickness were compared their radiopacity with the same thickness of the standard aluminum plate. The radiopacity of both resin matrix/SiO2and resin matrix/ZrO2composites increased gradually as the filler loading increased. The resin matrix/ZrO2composites possessed radiopacity higher than the standard aluminum plate. The increase of filler loading showed highly significant differences in the radiopacity as tested by ANOVA (P= 0.000).

Reproductive Toxicity Evaluation of the Dental Resin Monomer Triethylene Glycol Dimethacrylate (CASRN 109-16-0) in Mice

2013 ◽  
Vol 33 (2) ◽  
pp. 106-115 ◽  
Author(s):  
Lori H. Moilanen ◽  
Janell K. Dahms ◽  
Alan M. Hoberman
Keyword(s):  
Reproductive Toxicity ◽  
Sperm Concentration ◽  
Clinical Signs ◽  
Triethylene Glycol ◽  
Glycol Dimethacrylate ◽  
Dental Resin ◽  
Triethylene Glycol Dimethacrylate ◽  
Male And Female ◽  
Body Weights ◽  
Chemical Abstracts Service

The reproductive toxicity potential of the resin monomer triethylene glycol dimethacrylate (TEGDMA; Chemical Abstracts Service Registry Number 109-16-0) was investigated in male and female Crl:CD1(ICR) mice, 4 dosage groups, 25 mice/sex/group. Formulations of TEGDMA (0, 0.01, 0.1, or 1.0 mg/kg/d) in reverse osmosis-processed deionized water were intubated once daily beginning 28 days before cohabitation and continuing through mating (males) or through gestation day 17 (females). The following parameters were evaluated: viability, clinical signs, body weights, estrous cyclicity, necropsy observations, organ weights, sperm concentration/motility/morphology, cesarean-sectioning and litter observations, and histopathological evaluation of select tissues. No deaths or clinical signs related to TEGDMA occurred. No significant changes in male and female body weights and body weight gains were recorded for any of the administered dosages of TEGMDA. All mating and fertility parameters and all litter and fetal data were considered to be unaffected by dosages of TEGMDA as high as 1 mg/kg/d. Gross or histopathologic tissue changes attributable to the test article were not observed. Reproductive and developmental no observed adverse effect levels (NOAELs) for TEGMDA were 1.0 mg/kg/d, the highest dose tested. Comparison of conservatively estimated TEGDMA exposures from dental treatments to the NOAEL of 1.0 mg/kg/d identified in this study indicates margins of exposure of at least 120- to 3000-fold depending on the exposure scenario. The results of this study support the continued safe use of TEGDMA in polymeric dental products applied according to the manufacturers’ instructions.

scholarly journals Validation of the Scale Intended for the Assessment of the Quality of Life of Persons With Lumbal Syndrome // Validacija skale namenjene proceni kvaliteta života osoba sa lumbalnim sindromom

2018 ◽  
Vol 15 (1) ◽  
Author(s):  
Milan Nešić ◽  
Romana Romanov ◽  
Tatjana Jezdimirović ◽  
Josip Lepeš ◽  
Slobodan Andrašić
Keyword(s):  
Quality Of Life ◽  
Social Relations ◽  
Mean Value ◽  
Alpha Coefficient ◽  
Cronbach’S Alpha ◽  
Cronbach's Alpha ◽  
Lumbar Syndrome ◽  
Level Of Significance ◽  
High Degree

In order to determine the metric characteristics of the scale intended for the assessment of the quality of life of persons with lumbar syndrome (PQL-LS) on a sample of 202 subjects (M = 93; F = 109), three procedures for checking its metric characteristics were applied: factor analysis (Principal Components Analysis) with the Direct Oblimin method, in order to identify the latent structure of the perception of the quality of life of the respondents; Scale Reliability Analysis based on Cronbach’s alpha coefficient; and a validation check based on the coefficient of internal correlation of the scale (Spearman’s correlation of rank - rho). The results show that the scale has good metric characteristics and that it has a multi-item character (twenty-seven indicators). The internal accordance of the scale is in the high reference range of the Cronbach’s alpha coefficient (0.947). The values of correlation coefficient of subscale scores: physical health, mental health, social relations and environment show a high degree of correlation with the overall mean value of the entire scale, which confirms the validity of the analyzed domains (subscale) and the scale as a whole (at the level of significance r <0.001). All 27 variables yielded the corresponding weight of the single extracted component (KMO = 0.901; Sig. = 0.000), which determined that the scale had adequate validity. Based on the identified good metric characteristics, this scale can be recommended for use as a unique/autonomous multi-item scale designed to assess the quality of life of adults with lumbar syndrome.

TEGDMA Modulates Glutathione Transferase P1 Activity in Gingival Fibroblasts

2004 ◽  
Vol 83 (12) ◽  
pp. 914-919 ◽  
Author(s):  
M. Lefeuvre ◽  
K. Bourd ◽  
M.-A. Loriot ◽  
M. Goldberg ◽  
P. Beaune ◽  
...  
Keyword(s):  
Biochemical Analysis ◽  
Glutathione Transferase ◽  
Aqueous Media ◽  
Triethylene Glycol ◽  
Gingival Fibroblasts ◽  
Dental Resin ◽  
Competitive Antagonist ◽  
Triethylene Glycol Dimethacrylate ◽  
Low Concentrations

Dental resinous materials can contain large amounts (from 30 to 50%) of triethylene-glycol-dimethacrylate (TEGDMA). This compound leaches into aqueous media and is toxic to dental pulp, as well as to gingival fibroblasts in vitro. To elucidate the mechanism of TEGDMA toxicity, we investigated the effects on glutathione (GSH) level and glutathione transferase P1 (GSTP1) activity in cultured human gingival fibroblasts. TEGDMA cytotoxic concentrations (from 0.5 to 2 mM) induced a depletion of GSH without formation of oxidized GSH (GSSG). In fibroblasts expressing the wild-type GSTP1, TEGDMA both inhibited and potentiated GSTP1 activity at high (IC50 = 1.1 mM) and low concentrations, respectively. In contrast, cells expressing the GSTP1 *A/*B variant showed a weak inhibition of GST activity only, associated with greater sensitivity to drug toxicity. Biochemical analysis of GSTP1 inhibition revealed that TEGDMA is a non-competitive antagonist with respect to GSH and substrate. Thus, TEGDMA interference with GSH and GSTP1 activity may contribute to dental-resin-induced adverse effects.

Behavior comparison of PMMA-PTEGDMA copolymerized by two different methods.

2002 ◽  
Vol 725 ◽  
Author(s):  
R. Velazquez ◽  
J. Reyes ◽  
V.M. Castaño
Keyword(s):  
Triethylene Glycol ◽  
Bulk Polymerization ◽  
Polymerization Reaction ◽  
Chemical Compositions ◽  
Glycol Dimethacrylate ◽  
Scanning Calorimetry ◽  
Triethylene Glycol Dimethacrylate ◽  
Polymer Bulk ◽  
Characterization Study ◽  
Scanning Electron

AbstractThe acrylic system consisting of a casting syrup [made of polymethyl methacrylate (PMMA) dissolved in methyl methacrylate (MMA) monomer] and triethylene glycol dimethacrylate (TEGDMA) monomer was polymerized by two different methods. One of these methods was made by thermal decomposition of benzoil peroxide (BP) as initiator, and the other one, used the promoted decomposition of BP using dimethyl p-toluidine (DMT). Both types of polymerization were carried out by bulk polymerization in closed test tubes. Since the polymerization reactions were over, the polymer obtained from the two methods were very different each other in appearance and, when characterization analysis were performed those gave evidence of different behavior between the two types of polymers. The characterization study was carried out using Scanning Electron Microscopy (SEM) to observe the morphology and microstructure in the polymers. Fourier Transform Infrared (FTIR), Raman and micro-Raman to analyze differences on the chemical compositions in the polymer bulk. Differential Scanning Calorimetry (DSC) to evaluate the thermal behavior, Dilatometry to determine the final cure shrinkage after polymerization reaction in the two types of polymers.

scholarly journals Novel self-healing dental resin with microcapsules of polymerizable triethylene glycol dimethacrylate and N,N-dihydroxyethyl-p-toluidine

2016 ◽  
Vol 32 (2) ◽  
pp. 294-304 ◽  
Author(s):  
Junling Wu ◽  
Michael D. Weir ◽  
Qiang Zhang ◽  
Chuanjian Zhou ◽  
Mary Anne S. Melo ◽  
...  
Keyword(s):  
Triethylene Glycol ◽  
Self Healing ◽  
Glycol Dimethacrylate ◽  
Dental Resin ◽  
Triethylene Glycol Dimethacrylate
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