In-vitro strength degradation of dental ceramics and novel PICN material by sharp indentation

Coldea, Andrea; Swain, Michael V.; Thiel, Norbert

doi:10.1016/j.jmbbm.2013.05.004

Cited by 130 publications

(90 citation statements)

References 27 publications

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“…The critical notch root radius should be approximately of the same size than the major microstructural feature size for the SEVNB test, however, sometimes, it is impossible to produce such sharp notch [12]. Yet, the SEVNB is the test of choice to evaluate fracture toughness of ceramics [11], and it was previously used [25] to evaluate a very similar PICN material, which showed similar K Ic value (1 ± 0.04 MPa m 1/2 ) to the present study (1.09 ± 0.05 MPa m 1/2 ). In the present study, the blocks from which the test specimens were fabricated only exist for milling crowns.…”

Section: Discussionmentioning

confidence: 99%

Characterization of a polymer-infiltrated ceramic-network material

2014

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Objectives To characterize the microstructure and determine some mechanical properties of a polymer-ingfiltrated ceramic-network (PICN) material (Vita Enamic, Vita Zahnfabrik) available for CAD–CAM systems. Methods Specimens were fabricated to perform quantitative and qualitative analyses of the material’s microstructure and to determine the fracture toughness (KIc), density (ρ), Poisson’s ratio (v) and Young’s modulus (E). KIc was determined using V-notched specimens and the short beam toughness method, where bar-shaped specimens were notched and 3-point loaded to fracture. ρ was calculated using Archimedes principle, and v and E were measured using an ultrasonic thickness gauge with a combination of a pulse generator and an oscilloscope. Results Microstructural analyses showed a ceramic- and a polymer-based interpenetrating network. Mean and standard deviation values for the properties evaluated were: KIc = 1.09 ± 0.05 MPa m1/2, ρ = 2.09 ± 0.01 g/cm3, v = 0.23 ± 0.002 and E = 37.95 ± 0.34 GPa. Significance The PICN material showed mechanical properties between porcelains and resin-based composites, reflecting its microstructural components.

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Section: Discussionmentioning

confidence: 99%

Characterization of a polymer-infiltrated ceramic-network material

2014

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“…56 In comparison to dental porcelains, this new material has been proven to have lower elastic modulus and higher damage tolerance. 57 In 2013, the product Enamic (Vita, Bad Sachingen, Germany) was introduced for dental restorations. This PICN is based on initial sintering of a porcelain powder to approximately 70% of its full density, followed by infiltration with a monomer mixture.…”

Section: Polymer Infiltrated Ceramic Network (Picns)mentioning

confidence: 99%

Dental ceramics: a review of new materials and processing methods

et al. 2017

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The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics. The objective of this literature review is to discuss the main advantages and disadvantages of the new ceramic systems and processing methods. The manuscript is divided in five parts: I) monolithic zirconia restorations; II) multilayered dental prostheses; III) new glass-ceramics; IV) polymer infiltrated ceramics; and V) novel processing technologies. Dental ceramics and processing technologies have evolved significantly in the past ten years, with most of the evolution being related to new microstructures and CAD-CAM methods. In addition, a trend towards the use of monolithic restorations has changed the way clinicians produce all-ceramic dental prostheses, since the more aesthetic multilayered restorations unfortunately are more prone to chipping or delamination. Composite materials processed via CAD-CAM have become an interesting option, as they have intermediate properties between ceramics and polymers and are more easily milled and polished.

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“…Vita Enamic (Vita Zahnfabrik) was recently introduced as a polymer-infiltratedceramic-network material. 29,30 This material is claimed to be a hybrid ceramic material comprising a structuresintered ceramic matrix with space in between ceramic substrates filled with resin material to form a so-called double network hybrid. Although the processing is not disclosed by the manufacturer, the mass percentage of the inorganic ceramic part is stated to be 86 wt% and the organic polymer part 14 wt%.…”

mentioning

confidence: 99%