Contact Damage of Model Dental Multilayers: Experiments and Finite Element Simulations

Soboyejo, Winston O.; Wang, Rong Jun; Katsube, N.; Seghi, Robert R.; Pagedas, C.; Skraba, P.; Mumm, Daniel R.; Evans, A.G.

doi:10.4028/www.scientific.net/kem.198-199.135

Cited by 13 publications

(11 citation statements)

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“…The above results suggest that the reduced stress concentrations associated with bioinspired functionally graded architectures can be used to engineer significant reductions in pop‐in loads. Because pop‐in can occur by sub‐critical crack growth mechanisms in the top ceramic layers, 2,3 this should translate into improved resistance to sub‐critical fatigue crack growth. However, contact fatigue experiments are needed to establish the extent to which functionally graded architectures promote improvements in fatigue resistance.…”

Section: Discussionmentioning

confidence: 99%

“…Due to the complex structure of actual dental restorations flat multilayered structures (with equivalent elastic properties) are often used to model contact‐induced damage in dental multilayers 2,3 Figure 1a. shows the idealized four‐layer model of the ceramic dental crowns.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have shown that radial cracking is a major failure mode that can occur in the top ceramic layer of ceramic crowns that are used in dental restorations 2–4 . These cracks initiate in the vicinity of the dental cement that attaches the dental restoration to the dentin/dentin‐like ceramic filled polymers.…”

Section: Introductionmentioning

confidence: 99%

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Design of functionally graded dental multilayers

Rahbar

Soboyejo

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T This paper presents the results of a computational and experimental effort to develop crack-resistant dental multilayers that are inspired by the functionally graded dentoenamel-junction (DEJ) structure that occurs between dentin and enamel in natural teeth. The complex structures of natural teeth and ceramic crowns are idealized using flatlayered configurations. The potential effects of teeth-on-teeth contact are then modelled using finite element simulations of Hertzian contact. The resulting stress distributions are compared for a range of possible bioinspired, functionally graded architecture. The computed stress distributions show that the highest stress concentrations in the top ceramic layer of crown structures are reduced significantly by the use of bioinspired functionally graded architectures. The reduced stresses are experimentally shown to be associated with significant improvements (∼32%) in the pop-in loads. The implications of the results are discussed for the design of bioinspired dental ceramic crown structures. The bioinspired functionally graded layers are also shown to promote improvements in the critical crack size.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design of functionally graded dental multilayers

Rahbar

Soboyejo

2011

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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“…Moreover, there are mismatches in the thermal properties between the veneering porcelain and metal core, where thermal expansion coefficient for metal core is usually higher than that of veneering porcelain (Figure 7). These significant mismatches between both materials properties result in stresses concentration at the metal-ceramic interfaces which may cause interface cracking and consequently lead to restoration failure [95,96].…”

Section: Overviewmentioning

confidence: 99%

Functional Biomimetic Dental Restoration

Senan¹,

Madfa²

2017

Insights Into Various Aspects of Oral Health

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Bioinspired functionally graded approach is an innovative material technology, which has rapidly progressed both in terms of materials processing and computational modeling in recent years. Bioinspired functionally graded structure allows the integration of dissimilar materials without formation of severe internal stress and combines diverse properties into a single material system. It is a remarkable example of nature's ability to engineer functionally graded dental prostheses. Therefore, this novel technology is designed to improve the performance of the materials in medical and dental fields. Thus, this chapter book reviews the current status of the functionally graded dental prostheses and biomimetic process inspired by the human bone, enamel and dentin-enamel junction (DEJ) structures and the linear gradation in Young's modulus of the human bone, enamel and dentin-enamel junction, as a new material design approach, to improve the performance compared to traditional dental prostheses. Notable research is highlighted regarding application of biomimetic prostheses into various fields in dentistry. The current chapter book will open a new avenue for recent researches aimed at the further development of new dental prostheses for improving their clinical durability.

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“…Furthermore, there are mismatches in the thermal properties between the veneering porcelain and metal core, where coefficient thermal expansion for metal core is usually higher than veneering porcelain. The significant mismatch between both material properties concentrate stresses at the interfaces that may cause cracks at the metal–ceramic interface and consequently to the failure of the restoration [21], [22]. Lastly, metal core is more susceptible to corrosion in which its effect ranges from degradation of appearance to loss of mechanical strength [23], [24].…”

Section: Introductionmentioning

confidence: 99%

Dental prostheses mimic the natural enamel behavior under functional loading: A review article

Madfa

Yue

2016

Japanese Dental Science Review

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SummaryAlumina- and zirconia-based ceramic dental restorations are designed to repair functionality as well as esthetics of the failed teeth. However, these materials exhibited several performance deficiencies such as fracture, poor esthetic properties of ceramic cores (particularly zirconia cores), and difficulty in accomplishing a strong ceramic–resin-based cement bond. Therefore, improving the mechanical properties of these ceramic materials is of great interest in a wide range of disciplines. Consequently, spatial gradients in surface composition and structure can improve the mechanical integrity of ceramic dental restorations. Thus, this article reviews the current status of the functionally graded dental prostheses inspired by the dentino-enamel junction (DEJ) structures and the linear gradation in Young's modulus of the DEJ, as a new material design approach, to improve the performance compared to traditional dental prostheses. This is a remarkable example of nature's ability to engineer functionally graded dental prostheses. The current article opens a new avenue for recent researches aimed at the further development of new ceramic dental restorations for improving their clinical durability.

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Contact Damage of Model Dental Multilayers: Experiments and Finite Element Simulations

Cited by 13 publications

References 0 publications

Design of functionally graded dental multilayers

Design of functionally graded dental multilayers

Functional Biomimetic Dental Restoration

Dental prostheses mimic the natural enamel behavior under functional loading: A review article

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