Damage Modes in Dental Layer Structures

Jung, Yeon‐Gil; Wuttiphan, Sataporn; Peterson, Irene M.; Lawn, Brian R.

doi:10.1177/00220345990780040901

Cited by 98 publications

(71 citation statements)

References 37 publications

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“…The degree of crack slanting was greater for smaller marginal angles and shorter distances from the ceramic/resin interface. Several studies have reported on crack slanting or deflection in ceramic materials with a marginal angle of 90° 13,14,[22][23][24] . Crack slanting or deflection occurred with marginal angles of 45 and 60°.…”

Section: Discussionmentioning

confidence: 99%

Cracks formed by Vickers indentation adjacent to the interface in bonded dental ceramics with various marginal angles

et al. 2011

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The objective of this study was to assess the influence of the ceramic marginal angle on the length and nature of indentation cracks in ceramics near the ceramic/resin bonded interface. Disks of a leucite-reinforced ceramic or a diopside-based glass-ceramic bonded to a resin composite were sectioned so that the ceramic marginal angles were 45, 60, and 90°. Vickers indentations were placed in the ceramic at various distances from the bonded interface. The lengths of the indentation cracks running near parallel to the interface were measured and the orientation of crack propagation was characterized. The crack length and orientation were significantly affected by the distance from the interface and by the marginal angle, respectively. The crack length extended as the distance from the interface was shortened. Smaller marginal angles resulted in more oblique cracks. The toughness of the ceramic affected the indentation crack length, shape, and direction.

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Section: Discussionmentioning

confidence: 99%

Cracks formed by Vickers indentation adjacent to the interface in bonded dental ceramics with various marginal angles

et al. 2011

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“…First and foremost, it can emulate the loading conditions experienced by dental restorations and it is also able to represent the important aspects of crown response in oral function; additionally, it is an economical and simple testing protocol 2,7) . With this testing system, contact damage modes have been identified as cone cracking (brittle mode) and/or micro-deformation yield (quasi-plastic mode) on the surface of layered ceramic structures, and as radial cracking at the subsurface of the top layer 2,5,7,8) . These damage modes have been reported in many investigations, beginning with monolayer ceramic systems 2,5,6) , and proceeding to bilayer [8][9][10][11] and trilayer [11][12][13] systems with dentin-like substrate materials.…”

Section: Introductionmentioning

confidence: 99%

“…With this testing system, contact damage modes have been identified as cone cracking (brittle mode) and/or micro-deformation yield (quasi-plastic mode) on the surface of layered ceramic structures, and as radial cracking at the subsurface of the top layer 2,5,7,8) . These damage modes have been reported in many investigations, beginning with monolayer ceramic systems 2,5,6) , and proceeding to bilayer [8][9][10][11] and trilayer [11][12][13] systems with dentin-like substrate materials. Further on fracture damage studies, tests investigating coating/substrate mismatch (in terms of moduli of elasticity) 8,10,12,14) and thicknesses of these layers 8,10,12) have been conducted.…”

Section: Introductionmentioning

confidence: 99%

“…Although there is evidence-based data for the effect of luting agents on all-ceramic crowns 17,18) , the thickness effect of each layer in ceramic-cementdentin structures is not well studied. It is known that the overall fracture resistance of all-ceramic restorations is strongly dependent on the support material 8) . Additionally, preparation design, dentin thickness, cement type and thickness can be influential factors.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Layer Thickness on Stress Distribution in Ceramic-Cement-Dentin Multilayer Systems

2008

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The effects of dentin and cement thicknesses on stress level and distribution of crack propagation in ceramic-cement-dentin multilayer complex were analyzed. Custom-designed finite element analysis program based on JL Analyzer was used to analyze the stress distribution and present the maximum principal stress locations. In Zirconia, all the maximum stress values were above 100 MPa. In Empress II, they ranged between 50 and 105 MPa, which were approximately one-third of those of Zirconia. In Feldspathic, the maximum stress values were generally lower than 50 MPa. In all groups with 30 μm cement thickness, the highest values were observed at the bottom surface. For cement thicknesses at 50, 70, and 100 μm, maximum stress was found to occur at the top surface. However, changes in dentin thickness did not bring about significant changes in maximum stress values. Results of this study revealed the roles played by the following variables in the failure of a multilayer structure: cement thickness had a minor influence, dentin thickness exerted no influence, but the thickness and type of ceramic system played a significant role.

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“…Such transitions in crack mode have been well documented for brittle coatings fused to soft substrates. [1][2][3][4][5][6][7][8][9][10][11][12][13] In situ observations in a model transparent bilayer system consisting of a soda-lime glass layer bonded to a plastic substrate have proved especially useful in describing such modes.…”

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confidence: 99%

Cracking of Brittle Coatings Adhesively Bonded to Substrates of Unlike Modulus

et al. 2000

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The role of elastic mismatch in determining critical conditions for indentation fracture in brittle coatings on substrates of unlike modulus was investigated. A model transparent trilayer system, consisting of a glass coating layer bonded to a thick substrate of different glass or polymer by a thin layer of epoxy adhesive, facilitated in situ observations of crack initiation and propagation. A tungsten carbide sphere was used to load the layer system. Abrasion flaws were introduced into the top and bottom glass coating surfaces to control the flaw populations and to predetermine the origins of fracture: cone cracks occurred at abraded top surfaces, radial cracks at abraded bottom surfaces. Analytical relations for the critical loads are presented for each crack system in terms of elastic modulus mismatch, indenter and coating dimensions, and material fracture parameters. Implications concerning materials selection for resistance to crack initiation are considered.The problem of a brittle coating bonded to a substrate is of practical importance in layer applications. Engineering structures such as cutting tools, laminated windows and thermal barrier coatings, and natural structures like shells, teeth, and artificial crowns are examples. Hard outer layers provide resistance against damage from external influences (predominantly mechanical but also thermal and chemical); soft inner layers provide stress redistribution and crack containment. The adhesive needs to be sufficiently well bonded to the adjacent brittle layers to preclude delamination failures and soft enough to prevent sharp transverse cracks from penetrating into adjacent layers.Such considerations are especially important in the case of cracks formed from contacts or impact at the outer coating surface. Unfortunately, a soft support also allows the coating to flex beneath the contact, leading to changes in coating fracture mode from surface cone crack to a more dangerous subsurface radial crack. Such transitions in crack mode have been well documented for brittle coatings fused to soft substrates. [1][2][3][4][5][6][7][8][9][10][11][12][13] In situ observations in a model transparent bilayer system consisting of a soda-lime glass layer bonded to a plastic substrate have proved especially useful in describing such modes.14 Recently, we have examined a trilayer system in which an upper soda-lime glass layer (coating) is bonded to a like lower glass layer (substrate) with a soft epoxy adhesive. 15 In that latter case it is the soft adhesive rather than the substrate that allows the flexure mode to develop and generate radial fractures.Here we extend this last study to include substrates of different elastic modulus, in order to examine the influence of elastic mismatch in the sandwich structure. For this purpose we retain soda-lime glass as the top coating layer and the same epoxy as the adhesive but use different glasses and polymers as the substrate. We demonstrate a modest influence of substrate modulus on the critical conditions for contact-induced ra...

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Damage Modes in Dental Layer Structures

Cited by 98 publications

References 37 publications

Cracks formed by Vickers indentation adjacent to the interface in bonded dental ceramics with various marginal angles

Cracks formed by Vickers indentation adjacent to the interface in bonded dental ceramics with various marginal angles

Influence of Layer Thickness on Stress Distribution in Ceramic-Cement-Dentin Multilayer Systems

Cracking of Brittle Coatings Adhesively Bonded to Substrates of Unlike Modulus

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