Modified maximum tangential stress criterion for fracture behavior of zirconia/veneer interfaces

Mirsayar, MirMilad; Park, P.

doi:10.1016/j.jmbbm.2015.11.037

Cited by 43 publications

(18 citation statements)

References 23 publications

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“…In vitro work has shown that factors like thermocycling can affect the mechanical properties of zirconia [ 79 ]. These can be modulated by the geometric arrangement (such as thickness) of the zirconia dental appliances [ 80 ]. Therefore, depending on the clinical specifics of the case, material bulk mechanics should be considered.…”

Section: Discussionmentioning

confidence: 99%

Effect of Clinically Relevant CAD/CAM Zirconia Polishing on Gingival Fibroblast Proliferation and Focal Adhesions

et al. 2017

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Mucosal seal formation around dental abutments is critical to the successful integration of dental implants into the human oral cavity. No information exists for how clinically relevant polishing procedures for computer-aided design and computer-aided manufactured (CAD/CAM) zirconia abutments affects cellular responses important to mucosal seal formation. CAD/CAM zirconia was divided into four groups for clinically relevant polishing utilizing commercial polishing heads: control, coarse, coarse plus medium, and coarse plus medium plus fine. Surfaces were analyzed with scanning electron microscopy (SEM), atomic force microscopy (AFM), and optical profilometry (OP). Subsequently, human gingival fibroblasts (HGFs) were seeded onto the zirconia surfaces. Proliferation was measured via a quantitative SEM technique and focal adhesion kinase (FAK) phosphorylation status was measured by an enzyme-linked immunosorbent assay (ELISA). Results showed an increase in proliferation on all polished surfaces as compared to the control. Phosphorylation of FAK at tyrosine 397 (Y397) was up-modulated on the control surfaces. The associated cell adaptation is discussed. In all cases, FAK phosphorylation was greater at 24 h than 48 h. These results suggest that clinicians should be mindful of the effects of abutment polishing methodology, as this may have an impact on early mucosal seal formation.

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Section: Discussionmentioning

confidence: 99%

Effect of Clinically Relevant CAD/CAM Zirconia Polishing on Gingival Fibroblast Proliferation and Focal Adhesions

et al. 2017

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“…Generally speaking, a variety of fracture criteria are available in the literature to assess brittle fracture characteristics of materials. Three categories of criteria are used: energybased, [11][12][13][14][15] stress-based, [16][17][18][19][20] and strain-based [21][22][23][24][25][26][27] criteria. Each classification employs a different concept to describe the fracture mechanism and has intrinsic advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Tangential strain‐based criteria for mixed‐mode I/II fracture toughness of cement concrete

Mirsayar

Razmi

Berto

2017

Fatigue Fract Eng Mat Struct

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Experimental and theoretical works are performed on the mixed-mode I/II brittle fracture of cement concrete tested by edge cracked semicircular bend specimens. Theoretical background of the traditional fracture criteria including strain energy density, maximum tangential stress, and maximum tangential strain (MTSN) are introduced. The ability of each fracture criterion in prediction of the fracture test data is investigated. The comparison between the evaluations by the traditional criteria and the experimental data shows that none of them are capable of successfully estimating the fracture resistance of cement concrete. An enhanced version of the MTSN criterion is then employed to predict the test data. It is demonstrated that the extended MTSN criterion can successfully predict the test data in a higher accuracy than traditional criteria.

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“…Several recent studies have highlighted the importance of FEM analysis in clinical applications and the development of new prosthetic systems (Mirsayar and Park 2016;Mazaheri et al, 2016) and the use of innovative materials and surface treatments (Kumar et al, 2016). The methodological procedure is illustrated in Fig.…”

Section: Compact Bonementioning

confidence: 99%

About the Internal Structure of a Bone and its Functional Role

Apicella¹,

Aversa²,

Tamburrino³

et al. 2018

American Journal of Engineering and Applied Sciences

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The human skeleton has the primary role of supporting all the organs that make up the body and at the same time to protect them permanently. It is made up so that it can hold and hold together all internal human organs, protecting them permanently, but also allowing them to move and exercise all their functionalities. This paper wants to show the structure of a healthy, young bone, its functionalities, its role in a human being and some aspects of how bone health can prolong our lives, while a diseased bone organism will it gets sick and ends up losing his vital energy, mobilizing and in a final will dying. A bone is first produced from a cartilage. The cartilage then slowly transforms into a bone through a complex process. When a baby floats in his mother's womb, the developing organism begins to build its shape and causes the cartilage to do so. Cartilage is a tissue that is not as rough as bones but much more flexible and, in a way, more functional. A large amount of fetal cartilage starts to turn into bone, the process itself is called ossification. When ossification takes place, cartilage (which does not contain salts or minerals in it) begins to calcify; that is, the layers of calcium and phosphate salts begin to accumulate on the cells of the cartilage slowly. These cells, surrounded by more and more minerals, aging and dying. This leaves some small pockets of separation in the modified cartilage and small blood vessels grow in these cavities. Now, some specialized cells called osteoblasts start traveling in the developing bone through these blood vessels. These cells produce a substance consisting of collagen fibers and also help in the collection of calcium that is deposited along this fibrous substance (A common analogy for this design is reinforced concrete, which is a network of metal bars coated with concrete mixture). After a while, osteoblasts become part of the mixture, turning into inferior osteocytes, a retracted version of osteoblasts that continue to sneak but do not distance themselves too much from the blood vessels. This newly formed osteocyte network helps to form the sponge-like network of spongy bone. The oscillating bone is not soft, but looks spongy, meaning that it remains in its construction. These spaces help first of all to transfer the external pressure stress to the entire bone (distribution of external pressure on the entire surface of the bone) and secondly, these spaces also contain the marrow. Channel canals, called canaliculi, run on all calcified bone parts, allowing nutrients, gases, toxins and waste to pass through them. The more interesting part is that if the number of bones originally formed is much higher, in the newborn, immediately the bones begin to jug with each other, greatly reducing their total number, thus lowering the mobility and agility of the infant, in order to achieve a stature instead bigger, stronger, stronger, but that will not be as mobile as that of the newborn baby.

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Modified maximum tangential stress criterion for fracture behavior of zirconia/veneer interfaces

Cited by 43 publications

References 23 publications

Effect of Clinically Relevant CAD/CAM Zirconia Polishing on Gingival Fibroblast Proliferation and Focal Adhesions

Effect of Clinically Relevant CAD/CAM Zirconia Polishing on Gingival Fibroblast Proliferation and Focal Adhesions

Tangential strain‐based criteria for mixed‐mode I/II fracture toughness of cement concrete

About the Internal Structure of a Bone and its Functional Role

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