Evaluation of Mechanical Properties for Selected Dental Composite Resin Polymerized by Light Curing Technology at Different Thickness

2020 ◽  
Vol 1002 ◽  
pp. 331-339
Author(s):  
Fatin M. Hamam ◽  
Ban Adbul Maseeh Bader ◽  
Muna Y. Slewa
Keyword(s):  
Composite Resin ◽  
Irradiation Time ◽  
Dental Composite ◽  
Basic Material ◽  
Steel Mold ◽  
Light Curing ◽  
Wavelength Emission ◽  
Blue Phase ◽  
Light Cure Unit ◽  
Different Thickness

The objectives of this study were to estimate the effect of the blue light cure unit on the compression force and hardness for composite resin nanoCeram at different thickness. The basic material used in this study was Ivoclar Vivadent Tetric N-Ceram Light Cured Hybrid restorative composite resin. The samples were cured by applying a (LED.F) unit Blue phase in a wavelength emission spectrum (494 NM) was used.60 disc-shaped specimens [9 mm diameter at (0.5, 1) mm thickness and 10 mm diameter at (1.5) mm thickness] were prepared using a stainless steel mold for hardness and compressive strength measurements. A composite resin was polymerized with an aid of a ( DC 5V/1A) lamp for (10, 20 and 30) sec .Three specimens were used for each group.The results were analyzed using (linear logarithmic, quadratic, linear and power) test.The different groups showed significant variability in relation, with a significant interaction between the groups.The result showed that the greater thickness more efficient for polymerization than small thickness and the long irradiation time more efficient for polymerization than short irradiation time, long irradiation time diffusion in deep portions of the sample convert to polymer and this provide good polymerization and then good mechanicalproperties.

scholarly journals Effect of light intensity and irradiation time on the polymerization process of a dental composite resin

2004 ◽  
Vol 7 (2) ◽  
pp. 313-318 ◽  
Author(s):  
José Augusto César Discacciati ◽  
Alisson Discacciati Neves ◽  
Rodrigo Lambert Oréfice ◽  
Flávio Juliano Garcia Santos Pimenta ◽  
Herbert Haueisen Sander
Keyword(s):  
Light Intensity ◽  
Composite Resin ◽  
Irradiation Time ◽  
Dental Composite ◽  
Polymerization Process ◽  
Dental Composite Resin ◽  
Effect Of Light

scholarly journals Effect of the Time of Salivary Contamination during Light Curing on Degree of Conversion and Microhardness of a Restorative Composite Resin

Biomimetics ◽  
2018 ◽  
Vol 3 (3) ◽  
pp. 23 ◽  
Author(s):  
Rasoul Sahebalam ◽  
Alireza Boruziniat ◽  
Fahimeh Mohammadzadeh ◽  
Abdolrasoul Rangrazi
Keyword(s):  
Composite Resin ◽  
Clinical Problem ◽  
Human Saliva ◽  
Point Of View ◽  
Composite Resins ◽  
Degree Of Conversion ◽  
Dental Composite ◽  
Dental Composite Resins ◽  
Light Curing ◽  
Saliva Contamination

Saliva contamination is a major clinical problem in restorative procedures. The purpose of this study was to evaluate the effect of the time of salivary contamination during light curing on the degree of conversion and the microhardness of a restorative composite resin. Eight groups of 10 samples for measuring the microhardness and eight groups of 5 samples for evaluating the degree of conversion were prepared. The samples of each group were contaminated with human saliva at a certain time. The first group (T0) was contaminated before light curing. The specimens in groups T2–T30 were contaminated at 2, 5, 10, 15, 20 and 30 s after the start of light curing, respectively. The samples of group T40 were contaminated after light curing. The degree of conversion and the microhardness of the specimens were measured by Fourier transform infrared (FTIR) spectroscopy and Vickers hardness testing techniques, respectively. The results of this study revealed that there were no significant differences between the groups in terms of the degree of conversion of the composite resin. Consistent with the findings for the degree of conversion, significant differences in the microhardness between the groups were not found. In conclusion, from a clinical point of view, the results of our study showed that the time of salivary contamination (before, during or after light curing of composite resin) has no significant effect on the polymerization (degree of conversion) and one of the important mechanical properties of dental composite resins (microhardness).

scholarly journals Effect of different light-curing techniques on hardness of a microhybrid dental composite resin

2014 ◽  
Vol 17 (1) ◽  
pp. 45 ◽  
Author(s):  
Alessandra Nara de Souza Rastelli ◽  
Ricardo Scarparo Navarro ◽  
José Roberto Cury Saad ◽  
Marcelo Ferrarezi De Andrade ◽  
Vanderlei Salvador Bagnato
Keyword(s):  
Vickers Hardness ◽  
Composite Resin ◽  
Testing Machine ◽  
Dental Composite ◽  
Bottom Surface ◽  
Halogen Lamp ◽  
Surface Samples ◽  
Light Curing ◽  
Composite Hardness ◽  
Hardness Values

<p><strong>Objective</strong>:<strong> </strong>This study assessed the Vickers hardness provided by two LCUs when using (1) direct and indirect light-curing techniques, (2) 40 and 60 seconds and (3) top and bottom surfaces. <strong>Material and Methods</strong>: One halogen Curing Light 2500 (3M Espe) and one LED (MM Optics) were used by direct and indirect (0, 1.0, 2.0 and 3.0 mm of dental structure) techniques during 40 and 60 seconds. The samples were made with Filtek<sup>TM</sup> Z250 in a metallic mould with a central orifice (4 mm in diameter, 2 mm in thickness). The samples were stored in dry mean by ± 24 hours and the hardness measurements were performed in a testing machine (Buehler MMT-3 digital microhardness tester Lake Bluff, Illinois USA). A 50 gf load was used and the indenter with a dwell time of 30 seconds. The data were submitted to multiple ANOVA and Newman-Keuls‘s test (p&lt;0.05). <strong>Results</strong>: Halogen LCU exhibited higher Vickers hardness values than LED mainly because of the power density used. Hardness values were influenced by LCUs, light-curing techniques, irradiation times and surfaces. For both LCUs, hardness values were found to decrease with indirect light-curing technique, mainly for the bottom surface. Samples irradiated for 60 s exhibited higher hardness values when the halogen LCU was used. For 60 seconds, the VHN values were statistically significant greater than 40 seconds. Significant differences in top and bottom surfaces Vickers hardness number (VHN) values were observed among different LCUs used 40 and 60 seconds. <strong>Conclusion</strong>: The LCUs, light-curing techniques, variations of irradiation times, and surfaces (top and bottom) influence the composite hardness. </p><p><strong>Keywords</strong>: Composite resin, LED, Halogen lamp, Hardness, Photo-activation.</p>

scholarly journals Study of POSS on the Properties of Novel Inorganic Dental Composite Resin

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 478 ◽  
Author(s):  
Jiahui Wang ◽  
Yizhi Liu ◽  
Jianxin Yu ◽  
Yi Sun ◽  
Weili Xie
Keyword(s):  
Mechanical Properties ◽  
Composite Resin ◽  
Dental Composite ◽  
Resin Composites ◽  
Dental Resin ◽  
Dental Resin Composites ◽  
Dental Composite Resin ◽  
Light Curing ◽  
Curing Method ◽  
Oligomeric Silsesquioxane

Various amounts of methacryl polyhedral oligomeric silsesquioxane (POSS) were explored to be incorporated into novel nano SiO2 dental resin composites using light curing method. The scanning electron microscopy (SEM), optical microscopy, fourier transform infrared spectroscopy (FTIR), nanoindentation, nanoscratch and three-point flexure tests were performed. The volumetric shrinkage and mechanical properties such as hardness, elastic modulus, resistance, flexural strength and fracture energy were analyzed. With the additions of POSS, the volume shrinkage decreased and the mechanical properties initially increased. The effects of POSS on these properties were studied to provide a reference for clinically selecting a composite resin with excellent properties.

Chemical and morphological features of dental composite resin: Influence of light curing units and immersion media

2009 ◽  
pp. NA-NA ◽  
Author(s):  
Patrícia Aleixo Dos Santos ◽  
Patrícia Petromilli Nordi Sasso Garcia ◽  
Ana Luisa Botta Martins De Oliveira ◽  
Michelle Alexandra Chinelatti ◽  
Regina Guenka Palma-Dibb
Keyword(s):  
Composite Resin ◽  
Morphological Features ◽  
Dental Composite ◽  
Dental Composite Resin ◽  
Light Curing

Influence of the light-curing unit, storage time and shade of a dental composite resin on the fluorescence

Laser Physics ◽  
2010 ◽  
Vol 20 (7) ◽  
pp. 1647-1653 ◽  
Author(s):  
R. S. Queiroz ◽  
M. C. Bandéca ◽  
L. R. Calixto ◽  
U. Gaiao ◽  
A. Cuin ◽  
...  
Keyword(s):  
Storage Time ◽  
Composite Resin ◽  
Dental Composite ◽  
Dental Composite Resin ◽  
Light Curing

Effect of layer thickness on residual monomer release in polymerization of bulk-fill composites

2021 ◽  
pp. 096739112199958
Author(s):  
Vahti Kılıç ◽  
Feridun Hurmuzlu ◽  
Yılmaz Ugur ◽  
Suzan Cangul
Keyword(s):  
Stainless Steel ◽  
Layer Thickness ◽  
Composite Resin ◽  
Ethanol Solution ◽  
Composite Resins ◽  
Residual Monomer ◽  
Steel Mold ◽  
Nanohybrid Composite ◽  
Composite Samples

The aim of the present study was to investigate and compare the quantity of residual monomers leached from the bulk-fill composites with different compositions polymerized at varying layer thickness. Three bulk-fill (X-tra-fil, Beautifil Bulk Restorative, Fill-Up) and a nanohybrid composite (Filtek Z550) were used for the study. The composite resin samples were prepared with a stainless steel mold. For each composite, two groups were constructed. The samples in the first group were prepared using the 2 + 2 mm layering technique. In the second group, the composite samples were applied as a 4 mm-thick one layer and polymerized. Then, each composite samples were kept in a 75% ethanol solution and residual monomers released from composite resins were analyzed with an HPLC device after 24hour and 1 month. The data were analyzed using Kruskal-Wallis and Mann-Whitney U tests. Except the Fill-Up, all of residual monomer elution from the bulk-fill composites was significantly affected by the layer thickness (p < 0.05). The greatest monomer release was detected at 1 month after polymerization as a single 4 mm layer for Beautifil Bulk Restorative. Fill-Up composite showed similar residual monomer release in polymerization at different layer thicknesses compared to other composite resins. In the 2 + 2 mm layering technique, the least monomer elution was detected in the Filtek Z550 composite group. While Bis-GMA was the most released monomer in X-tra fil composite, UDMA was the most released monomer in all other composite resins. During polymerization of the bulk-fill composite, the layer thickness of the composite applied may affect the amount of residual monomers released from the composite resins. Conventional composites may release less monomer than bulk-fill composites when used with layering.

scholarly journals The Photoinitiators Used in Resin Based Dental Composite—A Review and Future Perspectives

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 470
Author(s):  
Andrea Kowalska ◽  
Jerzy Sokolowski ◽  
Kinga Bociong
Keyword(s):  
Current Knowledge ◽  
Biomechanical Properties ◽  
Degree Of Conversion ◽  
Dental Composite ◽  
Polymerization Process ◽  
Dental Composites ◽  
Dental Resin ◽  
Dental Resins ◽  
Light Curing

The presented paper concerns current knowledge of commercial and alternative photoinitiator systems used in dentistry. It discusses alternative and commercial photoinitiators and focuses on mechanisms of polymerization process, in vitro measurement methods and factors influencing the degree of conversion and hardness of dental resins. PubMed, Academia.edu, Google Scholar, Elsevier, ResearchGate and Mendeley, analysis from 1985 to 2020 were searched electronically with appropriate keywords. Over 60 articles were chosen based on relevance to this review. Dental light-cured composites are the most common filling used in dentistry, but every photoinitiator system requires proper light-curing system with suitable spectrum of light. Alternation of photoinitiator might cause changing the values of biomechanical properties such as: degree of conversion, hardness, biocompatibility. This review contains comparison of biomechanical properties of dental composites including different photosensitizers among other: camphorquinone, phenanthrenequinone, benzophenone and 1-phenyl-1,2 propanedione, trimethylbenzoyl-diphenylphosphine oxide, benzoyl peroxide. The major aim of this article was to point out alternative photoinitiators which would compensate the disadvantages of camphorquinone such as: yellow staining or poor biocompatibility and also would have mechanical properties as satisfactory as camphorquinone. Research showed there is not an adequate photoinitiator which can be as sufficient as camphorquinone (CQ), but alternative photosensitizers like: benzoyl germanium or novel acylphosphine oxide photoinitiators used synergistically with CQ are able to improve aesthetic properties and degree of conversion of dental resin.

Effect of layered double hydroxide intercalated with fluoride ions on the physical, biological and release properties of a dental composite resin

2014 ◽  
Vol 42 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Loredana Tammaro ◽  
Vittoria Vittoria ◽  
Anna Calarco ◽  
Orsolina Petillo ◽  
Francesco Riccitiello ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Composite Resin ◽  
Dental Composite ◽  
Fluoride Ions ◽  
Dental Composite Resin ◽  
Double Hydroxide
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