Bi-axial flexural strength of resin based dental composites – Influence and reliability of the testing method configuration

2021 ◽  
pp. 1-7
Author(s):  
Naresh Kumar ◽  
Fazal Ghani ◽  
Muhammad Amber Fareed ◽  
Samiya Riaz ◽  
Zohaib Khurshid ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Dental Composites ◽  
Testing Method

Mechanical Properties of Machinable Zirconia Dental Composites

2007 ◽  
Vol 336-338 ◽  
pp. 1587-1589
Author(s):  
Wen Xu Li ◽  
Hua Zhao ◽  
Ying Song ◽  
Bin Su ◽  
Fu Ping Wang
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Calcium Phosphate ◽  
Flexural Strength ◽  
Dental Composite ◽  
The Other ◽  
Dental Composites ◽  
Composite Ceramics ◽  
Cad Cam ◽  
The Common

Ca3(PO4)2/ZrO2 dental composite ceramics using for CAD/CAM system were prepared and the effects of weak phases on microstructures and mechanical properties were studied. The results showed that intergranular spreads happened with the increasing Ca3(PO4)2 contents due to the discontinuity of weak interfaces between Zirconia and Calcium phosphate in matrix. So the flexural strength and hardness of the Ca3(PO4)2/ZrO2 composite ceramics were decreased effectively, which improved the machinability of the composites. On the other hand, strong interfaces between Zirconias increased the integrality of the ceramic structures. ZrO2 composite Ceramics with 15% Ca3(PO4)2 were sintered at 1350°C. The flexural strength is 300.44MPa, fracture toughness is 4.36 MPam1/2, and hardness is 6.69 GPa. The cutting exponent of the Ca3(PO4)2/ZrO2 composite ceramics is obviously lower than that of the common commercial Vita Mark II and Dicor MGC ceramics, which shows good mechanical properties and machinability.

scholarly journals Flexural strength and modulus of elasticity of four dental composites polymerized with light emitting diode (LED) and halogen light

2010 ◽  
Vol 9 (3) ◽  
Author(s):  
Douglas Michielin Sari ◽  
Rita de Cássia Duquia ◽  
Josué Martos ◽  
Prudêncio Willy Rodo Osinaga
Keyword(s):  
Flexural Strength ◽  
Modulus Of Elasticity ◽  
Light Emitting Diode ◽  
Testing Machine ◽  
Composite Resins ◽  
Superior Performance ◽  
Dental Composites ◽  
Light Emitting ◽  
Halogen Light ◽  
Curing Light

The purpose of this investigation was to evaluate the flexural strength (FS) and modulus of elasticity (ME) of three microhybrid resins (Filtek Z250; Charisma; P60) and one submicrohybrid resin (Concept) using LED or halogen light polymerization. Twenty specimens (25x2x2 mm) per tested material were prepared and polymerized using a halogen or LED curing unit and stored in distilled water. FS and ME tests were performed on an Instron universal testing machine (0.75mm/min). ANOVA and multiple comparisons (SNK) showed that the two polymerization systems resulted in no significant differences (p>0.05) in the FS of Charisma and Filtek Z250. The two curing systems also produced similar results in the ME of Charisma, Concept and Filtek Z250. Significant differences were found in FS and ME, with the halogen curing light system showing better results than the LED system. The LED LCU systems did not exhibit a superior performance in our investigation of any of the composite resins, in terms of flexural strength and modulus of elasticity.

scholarly journals Chemical and Mechanical Properties of Experimental Dental Composites as a Function of Formulation and Postcuring Thermal Treatment

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Renata A. Esteves ◽  
Letícia C. C. Boaro ◽  
Flávia Gonçalves ◽  
Luiza M. P. Campos ◽  
Cecy M. Silva ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Elastic Modulus ◽  
Thermal Treatment ◽  
Flexural Strength ◽  
Low Cost ◽  
Chemical Properties ◽  
Degree Of Conversion ◽  
Dental Composites ◽  
Molar Ratios

This study evaluated the influence of formulation and thermal treatment on the degree of conversion, fracture toughness, flexural strength, and elastic modulus of experimental composites. Six composites were analyzed at BisGMA : TEGDMA molar ratios of 1 : 1 and 7 : 3 with filler at 30, 50, and 70 wt%. The degree of conversion was analyzed by Fourier transform infrared spectroscopy, fracture toughness was measured using the single-edge notched beam, and flexural strength and elastic modulus were measured with the 3-point bend test. For all tests, one-half of the specimens received thermal treatment at 170°C for 10 min. Data were analyzed by the Kruskal-Wallis or ANOVA/Tukey’s test (α = 5%). The 1 : 1 BisGMA : TEGDMA ratio showed higher properties than the 7 : 3 ratio. Although the material with 70% filler had a conversion lower than the one with 50%, it showed higher mechanical properties. The thermal treatment improved all properties in all materials. Therefore, the use of an equimolar ratio of BisGMA : TEGDMA can be paired with 70 wt% filler to design dental composites that possess increased advantageous physical and chemical properties. Furthermore, the simple and low-cost method of thermal treatment proposed for use in clinical dentistry has been shown to effectively improve the properties of all evaluated materials.

scholarly journals Conversion, shrinkage, water sorption, flexural strength and modulus of re-mineralizing dental composites

2015 ◽  
Vol 31 (11) ◽  
pp. 1279-1289 ◽  
Author(s):  
A. Aljabo ◽  
W. Xia ◽  
S. Liaqat ◽  
M.A. Khan ◽  
J.C. Knowles ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Water Sorption ◽  
Dental Composites

The effect of TiO2 nanotubes reinforcement on the mechanical properties and wear resistance of silica micro-filled dental composites

2018 ◽  
Vol 53 (23) ◽  
pp. 3217-3228 ◽  
Author(s):  
Abolfazl Mirjalili ◽  
Ali Zamanian ◽  
Seyed Mohammad Mahdi Hadavi
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Flexural Strength ◽  
Water Sorption ◽  
Hydrothermal Process ◽  
Physical And Mechanical Properties ◽  
Dental Composite ◽  
Dental Composites ◽  
Dental Resin ◽  
Electron Microscopies

One of the most important aspects of dental resin composites is the ability to improve mechanical properties by adding reinforcing filler particles. TiO2 nanotubes are expected to improve the physical and mechanical properties of silica micro-filled dental composite. Therefore, TiO2 nanotubes were synthesized using an alkaline hydrothermal process and then functionalized with 3-methacryloxypropyl-trimethoxysilane. TiO2 nanotubes were characterized by scanning and transmission electron microscopies, X-ray diffraction and Fourier transform infrared spectroscopy. Different quantities of TiO2 nanotubes and silica microparticles were reinforced in bisphenol A-glycidyl methacrylate (Bis-GMA) and tri-ethylene glycol dimethacrylate to prepare dental composite samples. Thereafter, the flexural strength and modulus, compressive strength, degree of conversion of monomers, wear resistance and water sorption were utlized to examine the prepared composites. The flexural strength and wear resistance of composites with 3 wt% TiO2 nanotubes significantly increased in comparison with other composites. On the other hand, due to the stability of composite, the water sorption was decreased. Therefore, TiO2 nanotubes reinforcement could be a promising solution for the improvement of mechanical properties in dental composites.

The Bending Properties of Sandwich Materials with Polyurethane Core

2014 ◽  
Vol 1030-1032 ◽  
pp. 1019-1022
Author(s):  
Petr Chocholouš ◽  
Miroslav Müller ◽  
Petr Valášek
Keyword(s):  
Flexural Strength ◽  
Thermal Insulation ◽  
Experimental Research ◽  
Modulus Of Elasticity ◽  
Flexural Properties ◽  
Bending Properties ◽  
Testing Method ◽  
Sandwich Materials

This article deals with thermal insulation sandwich materials and with their flexural properties. Suitability of designed testing method is confirmed according to experimental research. According to proposed method, flexural properties such as flexural strength and modulus of elasticity are stated. Type and mechanism of destruction sandwich materials during tests are described also.

scholarly journals Flexural Strength and Depth of Cure of Single Shade Dental Composites

2021 ◽  
pp. 110-118
Author(s):  
Fatin A. Hasanain
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
Dental Composites ◽  
Resin Composites ◽  
Dental Resin ◽  
Depth Of Cure ◽  
Universal Testing ◽  
Significant Difference ◽  
Experimental Laboratory ◽  
Cylindrical Samples

Aims: This work aims to assess the flexural strength and depth of cure of Optishade, Omnichroma and Z350 dental resin composites. Study Design: Experimental Laboratory Study. Methods: To assess flexural strength as per ISO standards, 15 samples of each of the three materials were made (n=5) with the dimensions 25x2x2 mm. They were then subjected to 3 point bending testing on a universal testing machine. To assess depth of cure as per ISO standard, 15 cylindrical samples 4 mm in diameter and 6 mm in height were created (n=5) and scraping test was performed. Results: There was a significant difference between the 3 materials in both flexural strength and depth of cure. Z350 had the lowest depth of cure and the highest flexural strength. Conclusion: Within the limitations of this study, all three tested materials fell within the ISO requirementsfor dental resin compositesfor both flexural strength and depth of cure.

scholarly journals Effect of the photoinitiator system on the properties of a dental material based on a hybrid polymer

2016 ◽  
Vol 19 (1) ◽  
pp. 96 ◽  
Author(s):  
Sandro Aurélio de Souza Venter ◽  
Gedalias Custódio Martim ◽  
Andressa Dos Santos ◽  
Tiago Roerto Detomini ◽  
Eduardo Radovanovic ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Dental Composites ◽  
Inorganic Filler ◽  
Test Machine ◽  
Hybrid Polymer ◽  
Dental Resin ◽  
Hybrid Polymers ◽  
Dental Resins ◽  
Polymer Shrinkage ◽  
Properties Of Composites

<p><strong>Objective:</strong> In this study, the effects of two different cure protocols upon the properties of composites using a hybrid-polymer as dental resin were evaluated. <strong>Material and Methods:</strong> Two distinct dental composites were prepared, one containing a mixture of TEGDMA/bis-GMA (50:50) and, another containing a mixture of TEGDMA/p-MEMO (50:50), [p-MEMO: oligomeric inorganic precursor]. Both composites were polymerized with lucirin and canphorquinone as photoinitiators. The composites were made with a 70 % wt of inorganic filler. Flexural strength was evaluated with a universal test machine and the degree of conversion was measured by infrared spectroscopy. A helium pycnometer was used to obtain polymer shrinkage data. Sorption tests were performed and SEM microscopy was used to show deleterious effects upon the resins’ surfaces. <strong>Results:</strong> The sample base on TEGDMA/p-MEMO polymerized with lucirin (L-T/p) showed the best values of the monitored properties. <strong>Conclusion</strong>: Lucirin is the most suitable photoinitiator for dental composites containing hybrid polymers.</p><p><strong>Keywords</strong></p><p><strong></strong>Dental resins; Flexural strength; Hybrid polymer; Photoinitiator system; Polymerization shrinkage.</p>

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