Hertzian contact response and damage tolerance of dental ceramics

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

doi:10.1016/j.jmbbm.2014.02.002

Cited by 39 publications

(27 citation statements)

References 16 publications

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“…However, those scaffolds could function as 3-dimensional network preforms for polymer infiltration and preparation of double-network composite blocks for CAD-CAM. Polymer-based composites with interpenetrating phases, which are characterized by porous 3-dimensional ceramic scaffolds infiltrated by a polymer matrix, have recently drawn attention in the literature and shown promising results (He and Swain 2011;Coldea et al 2013;Nguyen et al 2013;Coldea et al 2014;Della Bona et al 2014;Nguyen et al 2014;Okada et al 2014;Coldea et al 2015). However, the use of crystalline nonsilicate particles has not yet been tested for the development of such materials.…”

Section: Resultsmentioning

confidence: 99%

Silica Coating of Nonsilicate Nanoparticles for Resin-Based Composite Materials

et al. 2016

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A supplemental appendix to this article is published electronically only at http://jdr.sagepub.com/supplemental. AbstractThis study was designed to develop and characterize a silica-coating method for crystalline nonsilicate ceramic nanoparticles (Al 2 O 3 , TiO 2 , and ZrO 2 ). The hypothesis was that the coated nonsilicate nanoparticles would stably reinforce a polymeric matrix due to effective silanation. Silica coating was applied via a sol-gel method, with tetraethyl orthosilicate as a silica precursor, followed by heat treatment. The chemical and microstructural characteristics of the nanopowders were evaluated before and after silica coating through x-ray diffraction, BET (Brunauer-Emmett-Teller), energy-dispersive x-ray spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy analyses. Coated and noncoated nanoparticles were silanated before preparation of hybrid composites, which contained glass microparticles in addition to the nanoparticles. The composites were mechanically tested in 4-point bending mode after aging (10,000 thermal cycles). Results of all chemical and microstructural analyses confirmed the successful obtaining of silica-coated nanoparticles. Two distinct aspects were observed depending on the type of nanoparticle tested: 1) formation of a silica shell on the surface of the particles and 2) nanoparticle clusters embedded into a silica matrix. The aged hybrid composites formulated with the coated nanoparticles showed improved flexural strength (10% to 30% higher) and work of fracture (35% to 40% higher) as compared with composites formulated with noncoated nanoparticles. The tested hypothesis was confirmed: silanated silica-coated nonsilicate nanoparticles yielded stable reinforcement of dimethacrylate polymeric matrix due to effective silanation. The silica-coating method presented here is a versatile and promising novel strategy for the use of crystalline nonsilicate ceramics as a reinforcing phase of polymeric composite biomaterials.

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Section: Resultsmentioning

confidence: 99%

Silica Coating of Nonsilicate Nanoparticles for Resin-Based Composite Materials

et al. 2016

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“…When zirconia implants were restored with veneered zirconia crowns, chipping fractures were recorded 7) , indicating stresses higher than the strength of the veneering ceramic. A monolithic crown material with a low modulus of elasticity 8) might compensate the ancylotic connection between implant and bone as well as the high modulus of elasticity of the implant material. This might reduce the total load on the implant and surrounding bone.…”

Section: Introductionmentioning

confidence: 99%

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

Rohr

Märtin

Fischer

2018

Dental Materials Journal

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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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“…Regarding the Weibull modulus, all of the materials demonstrated relatively high values, indicating high reliability, with the FC material having the highest modulus. Coldea et al 21 measured the strength degradation of a range of dental CAD-CAM ceramic materials and found an initial flexural strength of 152 MPa and modulus of elasticity of 35.48 GPa for the PICN material. These values are approximately 18% and 23% higher than the values found in this study.…”

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confidence: 99%

“…However, the modulus of elasticity was determined by the impulse excitation of vibration technique. 21 The flexural strength test protocol had its limitations too. The length of the test bars could not conform to ISO 6872 because of the limiting size of the commercially available CAD-CAM blocks.…”

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confidence: 99%