Effect of storage conditions on mechanical properties of resin composite blanks for CAD/CAM crowns

The aim of this study was to evaluate mechanical properties of six new-generation all-ceramic materials for CAD/CAM (Lava Ultimate [LU], VITA Mark II [VM], InCoris TZI [IC], IPS e.max CAD [EM], VITA Suprinity [VS], IPS Empress CAD [EC]) and two different provisional restoration CAD/CAM materials (Telio CAD [TC], Vita CAD-Temp [VC]) after different storage conditions. 36 bar-shaped samples of 4 mm in width and 14 mm in length with 1.2 mm thicknesses were prepared from each material group (N=288). The specimens from each material were kept under three different storage conditions (n=12): under dry conditions at room temperature; 37°C distilled water for 7 days; and 37°C distilled water for 7 days followed by 10,000 thermal cycles. All specimens were subjected to a 3-point flexural test with a crosshead speed of 1.0 mm/min. The specimens were loaded until failure. Twelve fractured specimens after the flexural test from each group were used for the Vickers hardness test (under 300 gf of loading in 15 seconds). The flexural modulus, flexural strength and Vickers hardness values were separately analyzed with two-way analysis of variance, Tukey’s multiple comparison tests at a significance level of p<0.05. There were statistically significant differences between materials and storage conditions according to flexural modulus, flexural strength and Vickers hardness values (p<0.05). The flexural strength, flexural modulus and Vickers hardness values of LU, VC, TC, VS and IC decreased after water storage followed by thermal cycling (p<0.05). The mechanical properties of provisional restoration CAD/CAM materials had showed a significantly decrease after water storage followed by thermal cycles but their mechanical properties were acceptable for fabrication of provisional restorations. The mechanical properties of VM, EC and EM were not affected by different storage conditions whereas IC and VS were affected.

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Resin Composite Materials for Chairside CAD/CAM Restorations: A Comparison of Selected Mechanical Properties

Journal of Healthcare Engineering ◽

10.1155/2021/8828954 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Wojciech Grzebieluch ◽

Marcin Mikulewicz ◽

Urszula Kaczmarek

Keyword(s):

Mechanical Properties ◽

Flexural Strength ◽

Weibull Modulus ◽

Resin Composite ◽

Flexural Modulus ◽

Bending Test ◽

Weibull Analysis ◽

Three Point Bending ◽

Characteristic Strength ◽

Cad Cam

Objective. The aim was to evaluate the flexural strength, flexural modulus, microhardness, Weibull modulus, and characteristic strength of six resin composite blocks (Grandio Blocs-GR, Tetric CAD-TE, Brilliant Crios-CR, Katana Avencia-AV, Cerasmart-CS, and Shofu Block HC-HC). Methods. Flexural strength and flexural modulus were measured using a three-point bending test and microhardness using the Vickers method. Weibull analysis was also performed. Results. The materials showed flexural strength ranging from 120.38 (HC) to 186.02 MPa (GR), flexural modulus from 8.26 (HC) to 16.95 GPa (GR), and microhardness from 70.85 (AV) to 140.43 (GR). Weibull modulus and characteristic strength ranged from 16.35 (CS) to 34.98 (TE) and from 123.45 MPa (HC) to 190.3 MPa (GR), respectively. Conclusions. GR, TE, and CR presented significantly higher flexural strength, modulus, Weibull modulus, and characteristic strength than the others.

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Mechanical degradation of contemporary CAD/CAM resin composite materials after water ageing

Dental Materials ◽

10.1016/j.dental.2021.04.002 ◽

2021 ◽

Author(s):

Michael Wendler ◽

Anja Stenger ◽

Julian Ripper ◽

Eva Priewich ◽

Renan Belli ◽

...

Keyword(s):

Composite Materials ◽

Resin Composite ◽

Mechanical Degradation ◽

Cad Cam

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Mechanical properties of polyoxymethylene whiskers/polyoxymethylene resin composite films

Journal of Materials Science ◽

10.1007/bf02385448 ◽

1989 ◽

Vol 24 (6) ◽

pp. 2245-2249 ◽

Cited By ~ 6

Author(s):

Masaki Shimomura ◽

Yoji Maeda ◽

Yoshikazu Tanabe

Keyword(s):

Mechanical Properties ◽

Resin Composite ◽

Composite Films

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Comparison of Mechanical Properties of PMMA Disks for Digitally Designed Dentures

Polymers ◽

10.3390/polym13111745 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1745

Author(s):

Tamaki Hada ◽

Manabu Kanazawa ◽

Maiko Iwaki ◽

Awutsadaporn Katheng ◽

Shunsuke Minakuchi

Keyword(s):

Mechanical Properties ◽

Flexural Strength ◽

Water Sorption ◽

Water Solubility ◽

Flexural Modulus ◽

Manufacturing Method ◽

Heat Curing ◽

Significant Difference ◽

Cad Cam ◽

Curing Method

In this study, the physical properties of a custom block manufactured using a self-polymerizing resin (Custom-block), the commercially available CAD/CAM PMMA disk (PMMA-disk), and a heat-polymerizing resin (Conventional PMMA) were evaluated via three different tests. The Custom-block was polymerized by pouring the self-polymerizing resin into a special tray, and Conventional PMMA was polymerized with a heat-curing method, according to the manufacturer’s recommended procedure. The specimens of each group were subjected to three-point bending, water sorption and solubility, and staining tests. The results showed that the materials met the requirements of the ISO standards in all tests, except for the staining tests. The highest flexural strength was exhibited by the PMMA-disk, followed by the Custom-block and the Conventional PMMA, and a significant difference was observed in the flexural strengths of all the materials (p < 0.001). The Custom-block showed a significantly higher flexural modulus and water solubility. The water sorption and discoloration of the Custom-block were significantly higher than those of the PMMA-disk, but not significantly different from those of the Conventional PMMA. In conclusion, the mechanical properties of the three materials differed depending on the manufacturing method, which considerably affected their flexural strength, flexural modulus, water sorption and solubility, and discoloration.

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Mechanical properties, volumetric shrinkage and depth of cure of short fiber-reinforced resin composite

Dental Materials Journal ◽

10.4012/dmj.2015-280 ◽

2016 ◽

Vol 35 (3) ◽

pp. 418-424 ◽

Cited By ~ 29

Author(s):

Akimasa TSUJIMOTO ◽

Wayne W. BARKMEIER ◽

Toshiki TAKAMIZAWA ◽

Mark A. LATTA ◽

Masashi MIYAZAKI

Keyword(s):

Mechanical Properties ◽

Resin Composite ◽

Short Fiber ◽

Volumetric Shrinkage ◽

Fiber Reinforced ◽

Depth Of Cure

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Effect of Fiber’s Surface Pretreatment on the Interfacial Bonding Strength between Steel Fiber and Resin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.989-994.177 ◽

2014 ◽

Vol 989-994 ◽

pp. 177-180

Author(s):

Hao Yang ◽

Jian Hua Zhang ◽

Guo Yan Sun ◽

Yi Zhang

Keyword(s):

Mechanical Properties ◽

Cast Iron ◽

Bonding Strength ◽

Steel Fiber ◽

Resin Composite ◽

Interfacial Bonding ◽

Steel Fibers ◽

Surface Pretreatment ◽

Interfacial Bonding Strength ◽

Coupling Treatment

For the characteristic that the mechanical properties of resin composite are lower than cast iron, steel fibers are used to improve its properties in this paper. A weak interfacial bonding strength between steel fibers and resin indicates that steel fibers’ property cannot perform well in the polymer. In order to improve the interfacial bonding strength, four methods of surface treatment, phosphating, acid pickling, oxidation, and coupling are applied to steel fibers, and the corresponding pull-off tests are carried out to compare with untreated steel fibers. Research results show that the maximum interfacial bonding strength is increased by 45.1% after coupling treatment.

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