Static and fatigue mechanical behavior of three dental CAD/CAM ceramics

Homaei, Ehsan; Farhangdoost, Khalil; Tsoi, James Kit‐Hon; Matinlinna, Jukka Pekka; Pow, Ehn

doi:10.1016/j.jmbbm.2016.01.023

Cited by 101 publications

(75 citation statements)

References 43 publications

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“…Fracture load tests deliver first hints on the strength of a restorative material that is required to have free choice for cementing with conventional or adhesive cement. 20) and polymer-infiltrated ceramic (1.4±0.1 MPa √m) 20) was recorded using the SEVNB method. In the present study a linear correlation between flexural strength and fracture toughness was derived for the tested dental ceramics.…”

Section: Influence Of the Cement On The Fracture Loadmentioning

confidence: 99%

Correlations between fracture load of zirconia implant supported single crowns and mechanical properties of restorative material and cement

2018

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Zirconia implants that were restored with veneered zirconia displayed severe chipping rates of the restorations in clinical studies. Purpose of this study was to evaluate the fracture load of different zirconia implant supported monolithic crown materials (zirconia, alumina, lithium disilicate, feldspar ceramic and polymer-infiltrated ceramic) cemented with various cements (Harvard LuteCem SE, Harvard Implant Semi-permanent, Multilink Automix, VITA Adiva F-Cem). Flexural strength and fracture toughness of crown materials and compressive strength of the cements were measured. Fracture load values of crowns fabricated from lithium disilicate, feldspar ceramic and polymer-infiltrated ceramic were increased when cement with high compressive strength was used. Fracture loads for zirconia and alumina crowns were not influenced by the cement. Flexural strength and fracture toughness of the ceramics correlated linearly with the respective fracture load when using adhesive cement with high compressive strength. To achieve sufficient fracture load values, cementation with adhesive cement is essential for feldspar and polymer-infiltrated ceramic.

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Section: Influence Of the Cement On The Fracture Loadmentioning

confidence: 99%

Correlations between fracture load of zirconia implant supported single crowns and mechanical properties of restorative material and cement

2018

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“…2b. The plot is known as a Wohler curve or an S-N diagram constructed for the assessment of the fatigue life [2]. The data about the specimens which exhibited spontaneous fracture and those which survived the fatigue test are omitted from the curve fitting.…”

Section: Resultsmentioning

confidence: 99%

“…Load was applied at the midpoint of the specimen with a rate of 0.2 mm/min. Bending strength b and flexural modulus E b of the specimen material undergoing static three-point bending were determined as in [2,8] by the following formulas:…”

Section: Methodsmentioning

confidence: 99%

“…This raises the question as to what materials of this class produced by what technologies are most suitable for particular applications in vital structural members and critical parts. The high degrees of biological compatibility and chemical inertness allow for using the ceramics in medical engineering applications (for example, as osteoreplacing materials) [1][2][3][4]. Among the variety of structural ceramic materials, investigations of partially stabilized zirconia-based ceramics are of prime interest due to a comprehensive impact of porosity, grain structure, and phase composition on their mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

“…The foregoing parameters affect the physical and mechanical properties of the oxide ceramics, ranging from low performance characteristics, as in bone tissues, to record high characteristics, as in structural steels and alloys. Nowadays a large body of research is devoted to the relation between internal structure of zirconia-based ceramics and their mechanical properties, like compressive strength, bending strength, fracture toughness, and microhardness [2][3][4][5]. However, little is known about the fatigue behavior of porous ceramic materials [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Damage formation, fatigue behavior and strength properties of ZrO2-based ceramics

Козулин¹,

Narikovich²,

Kulkov³

et al. 2016

AIP Conference Proceedings

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Abstract. It is suggested that a non-destructive testing technique using a three-dimensional X-ray tomography be applied to detecting internal structural defects and monitoring damage formation in a ceramic composite structure subjected to a bending load. Three-point bending tests are used to investigate the fatigue behavior and mechanical and physical properties of medical-grade ZrO 2 -based ceramics. The bending strength and flexural modulus are derived under static conditions at a loading rate of 2 mm/min. The fatigue strength and fatigue limit under dynamic loading are investigated at a frequency of 10 Hz in three stress ranges: 0.91-0.98, 0.8-0.83, and 0.73-0.77 MPa of the static bending strength. The average values of the bending strength and flexural modulus of sintered specimens are 43 MPa and 22 GPa, respectively. The mechanical properties of the ceramics are found to be similar to those of bone tissues. The testing results lead us to conclude that the fatigue limit obtained from 10 5 stress cycles is in the range 33-34 MPa, i.e. it accounts for about 75% of the static bending strength for the test material.

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