scholarly journals Deterioration of Mechanical Properties of Composite Resins

1995 ◽  
Vol 14 (1) ◽  
pp. 78-83,104 ◽  
Author(s):  
Hiroyuki ARIKAWA ◽  
Hiroyuki KUWAHATA ◽  
Hideo SEKI ◽  
Takahito KANIE ◽  
Koichi FUJII ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Resins

Wear and mechanical properties of composite resins consisting of different filler particles

Odontology ◽  
2012 ◽  
Vol 101 (2) ◽  
pp. 156-169 ◽  
Author(s):  
Yoichi Tamura ◽  
Kiyoshi Kakuta ◽  
Hideo Ogura
Keyword(s):  
Mechanical Properties ◽  
Composite Resins ◽  
Filler Particles

scholarly journals Influence of Alumina Nanoparticles on the Mechanical Properties of a Bioresin Composite

2021 ◽  
Vol 58 (1) ◽  
pp. 248-256
Author(s):  
Kamel Earar ◽  
Camelia Ana Grigore ◽  
Magda-Ecaterina Antohe ◽  
Silvia Fotea ◽  
Adrian Beznea ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Composite Resins ◽  
The Other ◽  
Alumina Nanoparticles ◽  
Mechanical Mixing ◽  
Diametral Compression ◽  
Base Solution ◽  
Α Al2o3

The aim of this study is to characterize (wettability, surface roughness and gloss) and test (microhardness and diametral compression) four types of light-cured composite resins, one of which is commercial. The first lab-made composite is the reference, obtained by mechanical mixing of three monomers, in equal concentrations. The following two lab-made materials can be considered nanocomposites because they were mechanically mixed in the base solution (Bis-GMA/TEGDMA/Bis-EMA) with α-Al2O3 nanopowders, with a concentration of 5 wt.% for one solution and 10 wt.% for the other. The benchmark material comparison for these lab-made composite and nanocomposite resins is the bioresin system, Filtek™ Supreme Ultra Universal Restorative. Results were promising, especially for the 10 wt.% Al2O3/Bis-GMA/TEGDMA/Bis-EMA system, characterized by mechanical improvment in comparison with the reference composite.

scholarly journals THE EFFECT OF Musa acuminata AND Ocimum basilicum MIXED EXTRACTS TO THE SURFACE HARDNESS OF BIOACTIVE COMPOSITE RESIN

2020 ◽  
Vol 5 (2) ◽  
pp. 172
Author(s):  
Dewi Puspitasari ◽  
Maharani Laillyza Apriasari ◽  
Dewi Rahayu ◽  
Priyawan Rachmadi
Keyword(s):  
Mechanical Properties ◽  
Composite Resin ◽  
Surface Hardness ◽  
Ocimum Basilicum ◽  
Musa Acuminata ◽  
Dental Restoration ◽  
Composite Resins ◽  
Mixed Solution ◽  
Leaf Extracts ◽  
Banana Stem

ABSTRACTBackgrounds: The use of mouthwash daily may influence the mechanical properties of bioactive composite resin as a dental restoration, one of the mechanical properties is surface hardness. Herbal mouthwash can be used to minimize the side effect of mouthwash that contain alcohol. Mauli banana stem and basil leaf extracts can be produced into herbal mouthwash. Methods: Thirty specimens (10mm diameter x 2mm thick; n=5/group) bioactive composite resins were immersed in a mixed solution of Mauli banana and basil leaf extracts with concentration of 25%, 50%, 75 %%, 100%, the control group of chlorhexidine gluconate 0.2% and aquadest for 7 days in 37oC. Measurement of the surface hardness was using the Vickers Microhardness Tester with 100 gf load for 15 seconds. Results: One Way ANOVA and Post Hoc Bonferroni exhibited the significant differences (p <0.05) in hardness values between the specimens that immersed in the mixed solution Mauli banana and Basil leaf extracts, which in the concentration of 100% (4,49 ± 4,61 VHN) compared with 25% (38,20 ± 2,58 VHN), 50% (41,40 ± 3,84 VHN) and 75% concentration (40,40 ± 3,55 VHN). There was no siginificant difference (p >0.05) between specimens immersed in CHX, aquadest and the mixed solution of mauli banana and basil leaf extracts in all concentration. Conclusion: There is no change in bioactive composite resin surface hardness after immersed in the mixed solution of Mauli Banana stem (Musa acuminata) and Basil leaf (Ocimum basilicum) extracts.Keywords: Basil leaf extract, Bioactive resin, Mauli Banana stem extract, Surface hardness

scholarly journals Light-Curing Units, Photoinitiators System, and Monomers on Physico-Mechanical Properties of Experimental Composite Resins

2020 ◽  
Vol 25 (3) ◽  
Author(s):  
Gustavo Furlan da Silva Prezotto ◽  
Weverteon Soares de Lima ◽  
Rafael Pino Vitti ◽  
Ariel Farias da Silva ◽  
Mário Alexandre Coelho Sinhoreti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Resins ◽  
Light Curing

scholarly journals Microstructure and Mechanical Properties of Composite Resins Subjected to Accelerated Artificial Aging

2013 ◽  
Vol 24 (6) ◽  
pp. 599-604 ◽  
Author(s):  
Andrea Candido dos Reis ◽  
Denise Tornavoi de Castro ◽  
Marco Antonio Schiavon ◽  
Leandro Jardel da Silva ◽  
Jose Augusto Marcondes Agnelli
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Artificial Aging ◽  
Thermal Analyses ◽  
Surface Hardness ◽  
Composite Resins ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Microstructure And Mechanical Properties ◽  
Before And After

The aim of this study was to investigate the influence of accelerated artificial aging (AAA) on the microstructure and mechanical properties of the Filtek Z250, Filtek Supreme, 4 Seasons, Herculite, P60, Tetric Ceram, Charisma and Filtek Z100. composite resins. The composites were characterized by Fourier-transform Infrared spectroscopy (FTIR) and thermal analyses (Differential Scanning Calorimetry - DSC and Thermogravimetry - TG). The microstructure of the materials was examined by scanning electron microscopy. Surface hardness and compressive strength data of the resins were recorded and the mean values were analyzed statistically by ANOVA and Tukey's test (α=0.05). The results showed significant differences among the commercial brands for surface hardness (F=86.74, p<0.0001) and compressive strength (F=40.31, p<0.0001), but AAA did not affect the properties (surface hardness: F=0.39, p=0.53; compressive strength: F=2.82, p=0.09) of any of the composite resins. FTIR, DSC and TG analyses showed that resin polymerization was complete, and there were no differences between the spectra and thermal curve profiles of the materials obtained before and after AAA. TG confirmed the absence of volatile compounds and evidenced good thermal stability up to 200 °C, and similar amounts of residues were found in all resins evaluated before and after AAA. The AAA treatment did not significantly affect resin surface. Therefore, regardless of the resin brand, AAA did not influence the microstructure or the mechanical properties.

scholarly journals A Study of 3D-Printable Reinforced Composite Resin: PMMA Modified with Silver Nanoparticles Loaded Cellulose Nanocrystal

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2444 ◽  
Author(s):  
Shenggui Chen ◽  
Junzhong Yang ◽  
Yong-Guang Jia ◽  
Bingheng Lu ◽  
Li Ren
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Silver Nanoparticles ◽  
Composite Resin ◽  
Antibacterial Activities ◽  
Dental Restoration ◽  
Composite Resins ◽  
Resin Matrix ◽  
Homogeneous Distribution ◽  
Reinforced Composite

With the rapid application of light-curing 3D printing technology, the demand for high-performance polymer resins is increasing. Existing light-curable resins often have drawbacks limiting their clinical applications. This study aims to develop a new type of polymethyl methacrylate (PMMA) composite resins with enhanced mechanical properties, high antibacterial activities and excellent biocompatibilities. A series of reinforced composite resins were prepared by mechanically mixing PMMA with modified cellulose nanocrystals (CNCs), which were coated with polydopamine and decorated by silver nanoparticles (AgNPs) via Tollen reaction. The morphology of CNCs-Ag was observed by transmission electron microscopy and the formation of AgNPs on CNCs was confirmed by X-Ray photoelectron spectroscopy analyses. Functional groups in PMMA-CNCs-Ag composites were verified by Fourier Transform infrared spectroscopy (FTIR) spectroscopy. The mechanical assessment and scanning electron microscopy analysis suggested that the evenly distributed CNCs-AgNPs composite effectively improve mechanical properties of PMMA resin. Cytotoxicity assay and antibacterial activity tests indicated excellent biocompatibility and high antibacterial activities. Furthermore, PMMA with CNCs-AgNPs of 0.1 wt.% (PMMA-CNCs-AgNPs-0.1) possessed the most desirable mechanical properties owing to the homogeneous distribution of AgNPs throughout the resin matrix. This specific composite resin can be used as a functional dental restoration material with potential of other medical applications.

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