The effect of resin matrix composition on the polymerization shrinkage and rheological properties of experimental dental composites

2007 ◽  
Vol 23 (10) ◽  
pp. 1229-1235 ◽  
Author(s):  
A ELLAKWA ◽  
N CHO ◽  
I LEE
Keyword(s):  
Rheological Properties ◽  
Matrix Composition ◽  
Dental Composites ◽  
Resin Matrix ◽  
Polymerization Shrinkage

scholarly journals Improved performance of Bis-GMA dental composites reinforced with surface-modified PAN nanofibers

2021 ◽  
Vol 32 (7) ◽  
Author(s):  
Parisa Amiri ◽  
Zahra Talebi ◽  
Dariush Semnani ◽  
Rouhollah Bagheri ◽  
Hossein Fashandi
Keyword(s):  
Network Formation ◽  
Resin Composite ◽  
Flexural Modulus ◽  
Weight Ratio ◽  
Dental Composite ◽  
Dental Composites ◽  
Resin Matrix ◽  
Dental Resin ◽  
Polymerization Shrinkage ◽  
Surface Modified

AbstractIn the present work, polyacrylonitrile (PAN) nanofibers reinforced dental composites were investigated to achieve the improved interfacial adhesion between the PAN nanofiber and resin matrix using surface modification of nanofibers. PAN nanofibers mat were prepared by electrospinning and then, surface treated with the activated bisphenol A glycidyl methacrylate (Bis-GMA)/triethyleneglycol dimethacrylate (TEGDMA) (50/50 mass ratio) dental resin followed by photo-curing. Also, the treated nanofibers mat was milled into a powder to achieve the uniform distribution of nanofibers in the matrix resin. The reinforced dental composite were prepared by mixing the various mass fraction of the powder (0.5–15 wt%) with the Bis-GMA/TEGDMA dental monomers. The effect of weight ratio of surface-modified nanofibers to blend resin on the chemical structure, morphology, compression and flexural properties, color and polymerization shrinkage of dental composites was evaluated. The results showed that using surface-treated nanofibers with content of 5 wt% enhanced the compression strength, flexural strength, flexural modulus and work of rupture of the resultant dental composite by factors of 23%, 7%, 80%, and 145%, respectively, comparing to the unreinforced neat resin. Also, the polymerization shrinkage reduces by 37%. These significant improved properties of the dental composite could be due to the semi-interpenetration network formation between surface-modified nanofibers and resin matrix and well distribution of nanofibers in the dental resin. Further increasing the nanofiber content led to poor mechanical properties of obtained dental composites. The results also, revealed that the color of resin composite could be whiter using modified PAN nanofibers as the filler.

scholarly journals Effect of Fiber Post-Resin Matrix Composition on Bond Strength of Post-Cement Interface

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Ibtisam O. M. Alnaqbi ◽  
Haitham Elbishari ◽  
Emad S. Elsubeihi
Keyword(s):  
Bond Strength ◽  
Resin Cement ◽  
Matrix Composition ◽  
Resin Matrix ◽  
Fiber Post ◽  
Cement Interface ◽  
Significant Difference ◽  
Group 3 ◽  
Group 2 ◽  
Push Out

Objective. To evaluate the influence of 3 different post-resin matrix systems cemented with dual-cure resin cement in simulated root canals made of PMMA acrylic sheet. Methods. 3 types of fiber posts (n = 60) with different resin matrixes divided into 3 groups: group 1 cross-linked FRC Postec Plus post (n = 20), group 2 cross-linked Rely X post (n = 20), and group 3 Interpenetrated IPN Everstick post (n = 20). All posts were cemented using Multilink Automix dual-cure cement. Posts were cemented into acrylic blocks in order to purely test the strength of cement-post interface. After one week storage at 37°C, two sections of 1 mm thickness from middle-third were subjected to micro-push-out test at crosshead speed 0.5 mm/min. Results. The data were analyzed using one-way analysis of variance (ANOVA). The variable fiber post-matrix system was found to significantly affect the push-out bond strength (p<0.001). Group 2 exhibited that the highest mean push-out bond strength was (5.36 + 2.3 MPa), and group 3 showed the lowest mean push-out (0.41 + 0.4 MPa). There was significant difference among the groups regarding the failure mode as chi-square test revealed (p<0.001). Conclusion. Prefabricated cross-linked posts with epoxy-based matrix demonstrated higher bond strength than prefabricated cross-linked posts with Bis-GMA-based matrix and posts with semi-IPN matrix when luted with dimethacrylate-based dual-cured resin cement.

Synthesis and Characteristics of Dental Composites with Novel Bis-GMA Derivate as a Resin Base

2013 ◽  
Vol 745-746 ◽  
pp. 442-446 ◽  
Author(s):  
Rui Li Wang ◽  
Mo Zhu ◽  
Sheng Liu ◽  
Feng Wei Liu ◽  
Xiao Ze Jiang ◽  
...  
Keyword(s):  
Adverse Effects ◽  
Triethylene Glycol ◽  
High Viscosity ◽  
Dental Composites ◽  
Resin Matrix ◽  
Hydroxyl Groups ◽  
Acetyl Group ◽  
Matrix Differential ◽  
Dental Restorative ◽  
Kinetics Of

2,2-bis [4-(2-hydroxy-3-methacryloyloxypropoxy) pheny propane (Bis-GMA) and triethylene glycol dimethacrylate (TEGDMA) have been commonly used as a viscous monomer and a reactive diluent in the organic phase of dental restorative composites, respectively. The purpose of addition of TEGDMA is mainly to decrease the high viscosity of Bis-GMA caused by hydrogen bonding between hydroxyl groups. However, some adverse effects will accompany with increased amounts of the TEGDMA, such as higher values of polymerization shrinkage, which is not undesirable for the clinical application. Therefore, substituting hydroxyl groups of Bis-GMA might be an appropriate and effective way to reduce the amount of diluents and weaken the accompanied adverse effects. This work focuses on the synthesis of a novel Bis-GMA derivate, substituting acetyl groups for hydroxyl groups in Bis-GMA. The viscosity of Bis-GMA characterized with rotational rheometer was significantly decreased from 820 Pa.s to 11 Pa.s by substitution of acetyl group, leading to the low amount of TEGDMA in resin matrix. Differential Scanning Calorimeter (DSC) was used for investigating the reaction kinetics of this novel monomer with different mass ratios of TEGDMA. The results suggested that the maximum conversion of the Ac-Bis-GMA can reach 88% while the corresponding value for Bis-GMA is 75%. Dental composites were prepared from 2,2-bis [4-(2-acetyl-3-methacryloyloxypropoxy) pheny propane (Ac-Bis-GMA) or Bis-GMA resin mixtures with TEGDMA filled with 70 wt% silica co-fillers. The results presented that dental composites prepared from new resin matrixes exhibited adequate mechanical properties.

scholarly journals Development of an Innovative Urease-Aided Self-Healing Dental Composite

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 84
Author(s):  
Mostafa Seifan ◽  
Zahra Sarabadani ◽  
Aydin Berenjian
Keyword(s):  
Healing Process ◽  
Optical Microscope ◽  
Dental Restoration ◽  
Dental Composite ◽  
Dental Composites ◽  
Resin Matrix ◽  
Self Healing ◽  
Urease Enzyme ◽  
Near Future ◽  
Dental Restorative

Dental restorative materials suffer from major drawbacks, namely fracture and shrinkage, which result in failure and require restoration and replacement. There are different methods to address these issues, such as increasing the filler load or changing the resin matrix of the composite. In the present work, we introduce a new viable process to heal the generated cracks with the aid of urease enzyme. In this system, urease breaks down the salivary urea which later binds with calcium to form calcium carbonate (CaCO3). The formation of insoluble CaCO3 fills any resultant fracture or shrinkage from the dental composure hardening step. The healing process and the formation of CaCO3 within dental composites were successfully confirmed by optical microscope, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDS) methods. This research demonstrates a new protocol to increase the service life of dental restoration composites in the near future.

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