The influence of zirconia veneer thickness on the degree of conversion of resin-matrix cements: an integrative review

2021 ◽  
Author(s):  
Christie M. Tafur-Zelada ◽  
Oscar Carvalho ◽  
Filipe S. Silva ◽  
Bruno Henriques ◽  
Mutlu Özcan ◽  
...  
Keyword(s):  
Degree Of Conversion ◽  
Integrative Review ◽  
Resin Matrix

scholarly journals Effect of Camphorquinone Concentration in Physical-Mechanical Properties of Experimental Flowable Resin Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Dayany da Silva Alves Maciel ◽  
Arnaldo Bonfim Caires-Filho ◽  
Marta Fernandez-Garcia ◽  
Camillo Anauate-Netto ◽  
Roberta Caroline Bruschi Alonso
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Mechanical Strength ◽  
Surface Hardness ◽  
Degree Of Conversion ◽  
Bending Test ◽  
Resin Matrix ◽  
Shrinkage Stress ◽  
Depth Of Cure

The aim of this study was to evaluate the effect of camphorquinone concentration in physical-mechanical properties of experimental flowable composites in order to find the concentration that results in maximum conversion, balanced mechanical strength, and minimum shrinkage stress. Model composites based on BISGMA/TEGDMA with 70% wt filler loading were prepared containing different concentrations of camphorquinone (CQ) on resin matrix (0.25%, 0.50%, 1%, 1.50%, and 2% by weight). Degree of conversion was determined by FTIR. Surface hardness was assessed before and after 24 h ethanol storage and softening rate was determined. Depth of cure was determined by Knoop hardness evaluation at different depths. Color was assessed by reflectance spectrophotometer, employing the CIE-Lab system. Flexural strength and elastic modulus were determined by a three-point bending test. Shrinkage stress was determined in a Universal Testing Machine in a high compliance system. Data were submitted to ANOVA and Tukey’s test (α = 0.05). The increase in CQ concentration caused a significant increase on flexural strength and luminosity of composites. Surface hardness was not affected by the concentration of CQ. Composite containing 0.25% wt CQ showed lower elastic modulus and shrinkage stress when compared to others. Depth of cure was 3 mm for composite containing 1% CQ and 2 mm for the other tested composites. Degree of conversion was inversely correlated with softening rate and directly correlated with elastic modulus and shrinkage stress. In conclusion, CQ concentration affects polymerization characteristics and mechanical strength of composites. The concentration of CQ in flowable composite for optimized polymerization and properties was 1% wt of the resin matrix, which allows adequate balance among degree of conversion, depth of cure, mechanical properties, and color characteristics of these materials.

Degree of conversion and cross-link density within a resin-matrix composite

2017 ◽  
Vol 106 (4) ◽  
pp. 1496-1504 ◽  
Author(s):  
Afnan O. Al-Zain ◽  
George J. Eckert ◽  
Henry Lukic ◽  
Spiro J. Megremis ◽  
Jeffrey A. Platt
Keyword(s):  
Matrix Composite ◽  
Degree Of Conversion ◽  
Resin Matrix ◽  
Cross Link ◽  
Link Density ◽  
Resin Matrix Composite ◽  
Cross Link Density

scholarly journals Role of Composition to Degree of Conversion of Bulk Fill Composite Resins

2017 ◽  
Vol 6 (1) ◽  
pp. 33 ◽  
Author(s):  
Sefty Aryani Harahap ◽  
Yosi Kusuma Eriwati
Keyword(s):  
Composite Resin ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Resin Matrix ◽  
Double Bonds ◽  
Depth Of Cure ◽  
High Degree ◽  
Single Bonds

A recent technology of Bulk fill composite resin has been developed to save manipulation time. Bulk fill composite resinhas been claimed to have depth of cure up to 4 mm with a high degree of conversion. This paper will evaluate the role of bulk fill composite resin’s composition in increasingits degree of conversion. The degree of conversion is the percentage of carbon double bonds that were converted into single bonds as a result of polymerization. It is determined by its composition that contained filler, resin matrix and the photoinitiator. With the development and modifications of the composition, the bulk fill compositeresin  can be obtained a high degree of conversion so that the expected properties can be achieved.

Damage of Dental Amalgam and Resin-Matrix Composite Surfaces After Exposure to Bleaching Agents: An Integrative Review

2021 ◽  
Vol 7 (3) ◽  
Author(s):  
Inês C. Ferreira ◽  
Margarida Faria ◽  
Orlanda Torres ◽  
Paulo Rompante ◽  
Bruno Henriques ◽  
...  
Keyword(s):  
Matrix Composite ◽  
Dental Amalgam ◽  
Integrative Review ◽  
Resin Matrix ◽  
Resin Matrix Composite

The resin-matrix cement layer thickness resultant from the intracanal fitting of teeth root canal posts: an integrative review

2021 ◽  
Author(s):  
Valter Fernandes ◽  
Ana S. Silva ◽  
Oscar Carvalho ◽  
Bruno Henriques ◽  
Filipe S. Silva ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Root Canal ◽  
Integrative Review ◽  
Resin Matrix ◽  
Cement Layer

scholarly journals Comparative Study on The Structure, Physical Properties and Hardness Indentation of a Bulk Fill & An Incremental Composite Resin Restorative Materials

2020 ◽  
Vol 17 ◽  
pp. 204-214
Author(s):  
Amira Elsherbeny ◽  
Rizk Mostafa Shalaby ◽  
Sayed Mohamed Ghorab
Keyword(s):  
Surface Roughness ◽  
Statistical Analysis ◽  
Vickers Microhardness ◽  
Great Influence ◽  
Mean Value ◽  
Degree Of Conversion ◽  
Resin Matrix ◽  
Bottom Surface ◽  
Depth Of Cure ◽  
Significant Difference

Totally 80 disk-shaped specimens of Filtek™ Bulk-Fill, 3M ESPE, and Filtek™ Z250 XT, 3M ESPE, were prepared by using split-Teflon mold (4mm×10mm). Specimen characterization XRD, Surface roughness, degree of conversion, Surface microhardness, and depth of cure of the specimens were evaluated after the specimens were stored in distilled water in darkness at 37°C for 24 h. Statistical analysis was done using t-test with a significance level at p<0.05. FiltekTM Z350 XT showed the highest mean value of Vickers microhardness either on top surface 94.94% or bottom surface 69.92% and recorded 76.51% while FiltekTM Bulk-Fill was 66.85% for depth of cure. Filtek bulk-fill recorded a lower mean value of 0.73 for Surface roughness than FiltekTM Z350 XT and the highest degree of conversion of 84.34%. Statistical analysis showed that there was a significant difference between the mean values for all tested results. Increasing the filler content proved to have ability to enhance some properties, specially the surface roughness. Incorporation of some structurally rigid monomers like Bis-DMA, UDMA, TEGDMA within the resin matrix have a great influence on the measured properties, including degree of conversion reached to 84.34%, depth of cure to a level of 76.51% and Vickers microhardness to 94.94%.

Degree of conversion and microhardness mapping within a resin–matrix composite

2017 ◽  
Vol 33 ◽  
pp. e3-e4
Author(s):  
A.O. Al-Zain ◽  
G.J. Eckert ◽  
H. Lukic ◽  
S. Megremis ◽  
J.A. Platt
Keyword(s):  
Matrix Composite ◽  
Degree Of Conversion ◽  
Resin Matrix ◽  
Resin Matrix Composite

Cognitive structure, flexibility, and plasticity in human multitasking—An integrative review of dual-task and task-switching research.

2018 ◽  
Vol 144 (6) ◽  
pp. 557-583 ◽  
Author(s):  
Iring Koch ◽  
Edita Poljac ◽  
Hermann Müller ◽  
Andrea Kiesel
Keyword(s):  
Task Switching ◽  
Dual Task ◽  
Cognitive Structure ◽  
Integrative Review ◽  
Structure Flexibility ◽  
And Task
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