Failure mode of dental restorative materials under Hertzian indentation

Wang, Yan; Darvell, B.W.

doi:10.1016/j.dental.2006.11.016

Cited by 28 publications

(26 citation statements)

References 35 publications

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“…This was thought to be more conducive to AE data collection and was used in previous studies for fracture testing of dental materials 17,33) . The slow loading rate allowed for sufficient time for the detection of AE signals while the specimens were being loaded.…”

Section: Discussionmentioning

confidence: 99%

“…Initial crack formation was previously found to be greatly dependent on the stress distribution of the whole structure, which in turn is controlled by many material-and geometry-related variables 33) . In this study, the inclusion of fibers in the composite resin specimens had an evidently positive effect on their flexural strength.…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, postponing the initial failure is essential and reinforcement strategies that improve only the resistance to final failure simply extend the damage accumulation phase. Therefore, reinforcement and design techniques that improve the resistance to initial failure may be more valuable for dental prostheses and restorations 21,33) . Flexural strength is often a reliable indicator of structural performance for brittle dental materials, including composites.…”

Section: Discussionmentioning

confidence: 99%

“…In clinical service, loading and intraoral fatigue conditions propagate the cracks and ultimately lead to final fracture. Therefore, recording the load values at which initial microcracks occur might be the more accurate way of measuring the strength of a particular material, bringing the analysis closer to real clinical situations 33) . Consequently, postponing the initial failure is essential and reinforcement strategies that improve only the resistance to final failure simply extend the damage accumulation phase.…”

Section: Discussionmentioning

confidence: 99%

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Fracture of fiber-reinforced composites analyzed <i>via</i> acoustic emission

2015

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This study investigated the fracture resistance of composite resins using a three-point bending test and acoustic emission (AE) analysis. Three groups of specimens (n=15) were prepared: non-reinforced BelleGlass HP composite (NRC), unidirectional (UFRC) and multidirectional (MFRC) fiber-reinforced groups which respectively incorporated unidirectional Stick and multidirectional StickNet fibers. Specimens were loaded to failure in a universal testing machine while an AE system was used to detect audible signals. Initial fracture strengths and AE amplitudes were significantly lower than those at final fracture in all groups (p<0.05). Initial fracture strength of UFRC (170.0 MPa) was significantly higher than MFRC (124.6 MPa) and NRC (87.9 MPa). Final fracture strength of UFRC (198.1 MPa) was also significantly higher than MFRC (151.0 MPa) and NRC (109.2 MPa). Initial and final fracture strengths were significantly correlated (r=0.971). It was concluded that fiber reinforcement improved the fracture resistance of composite resin materials and the monitoring of acoustic signals revealed significant information regarding the fracture process.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Fracture of fiber-reinforced composites analyzed <i>via</i> acoustic emission

2015

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“…Contact between spherical and flat surface based on Hertz theory is regarded as one of the most effective method for the contact fatigue evaluation of dental ceramics [25][26][27][28]. As shown in Figure 1, because the hardness of tungsten carbide is greater than that of zirconia ceramics, the contact of this test is designed between tungsten carbide ball and zirconia ceramics flat surface specimen, and radius of tungsten carbide ball is same with the equivalent curvature radius of dental cusp.…”

Section: Experiments Principle Overviewmentioning

confidence: 99%

Strength degradation and lifetime prediction of dental zirconia ceramics under cyclic normal loading

et al. 2015

BME

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Abstract. Clinical cases show that zirconia restoration could happen fracture by accident under overloading after using a period of time. The purpose of this study is to research mechanical behavior and predict lifetime of dental zirconia ceramics under cyclic normal contact loading with experiments. Cyclic normal contact loading test and three point bending test are carried on specimens made of two brands of dental zirconia ceramic to obtain flexure strength and damage degree after different number of loading cycles. By means of damage mechanics model, damage degree under different number of contact loading cycles are calculated according to flexure strength, and verified by SEM photographs of cross section morphology of zirconia ceramics specimen phenomenologically. Relation curve of damage degree and number of cycles is fitted by polynomial fitting, then the number of loading cycles can be concluded when the specimen is complete damage. Strength degradation of two brands dental zirconia ceramics are researched in vitro, and prediction method of contact fatigue lifetime is established.

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