The fine structure and formation of hypermineralized petrodentine in the tooth plate of extant lungfish (Lepidosiren paradoxa and Protopterus sp.).

Ishiyama, Mikio; Teraki, Yoshimi

doi:10.1679/aohc.53.307

Cited by 21 publications

(10 citation statements)

References 19 publications

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“…It is very hard. Although it seems to have a collagenous matrix, this matrix is partially destroyed later in the tooth's development by the odontoblasts that formed it, presumably allowing room for its much greater mineralisation (Ishiyama and Teraki, 1990).…”

Section: Lungfishes' Petrodentinementioning

confidence: 99%

Mechanical properties and adaptations of some less familiar bony tissues

Currey

2010

Journal of the Mechanical Behavior of Biomedical Materials

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Section: Lungfishes' Petrodentinementioning

confidence: 99%

Mechanical properties and adaptations of some less familiar bony tissues

Currey

2010

Journal of the Mechanical Behavior of Biomedical Materials

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“…In the case of the pleromin of Chimaera phantasma , it was not possible to measure the microhardness perpendicular to the biting surface due to its surface condition (see Materials and Methods). However, in contrast to the anisotropic petrodentin, which is composed of the needle shaped hydroxyapatite crystals 26 , pleromin is supposed to be more isotropic than petrodentin: Pleromin is composed of oval-shaped and irregular shaped fine whitlockite crystals without preferred orientation (Fig. 5 ).…”

Section: Discussionmentioning

confidence: 99%

“…also have tooth plates with a constituent of hypermineralized petrodentin 23 – 25 . However, the petrodentin in the tooth plates consists of hydroxyapatite 26 . Whitlockite is known as the major constituent of the human dental calculus and is involved in the pathological calcification 27 , 28 , but it is not a constituent of normal dental hard tissues 22 .…”

Section: Introductionmentioning

confidence: 99%

A unique mineralization mode of hypermineralized pleromin in the tooth plate of Chimaera phantasma contributes to its microhardness

Iijima¹,

Ishiyama²

2020

Sci Rep

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Tooth plates of the chimaeroids, holocephalian fishes, are unique dental hard tissues. Unlike the teeth of other animals, the tooth plates are located on the roof of the mouth and in the lower jaw. Their tooth plates consist, to a large extent, of lightly mineralized tissue (osteodentin) and hypermineralized tissue (pleromin). Notably, the mineral phase of pleromin is whitlockite, while that of other animals is apatite. Dietary habits of chimaeroids and wearing features of their tooth plates suggest an extreme hardness of pleromin, but this has never been investigated. We examined the microhardness of the tooth plate of Chimaera phantasma and found that pleromin in the biting region was extremely hard, comparable with the hardness of mature tooth enamel, whereas the hardness of immature pleromin was lower than that of bovine dentin. The hardness of osteodentin, on the other hand, was equivalent to that of bovine dentin and almost the same throughout the tooth plate. Immature pleromin was sparsely packed with oval crystals of whitlockite and, as pleromin matures, the space between crystals was filled with small intercrystalline materials. The maturing process of pleromin could partly contribute to its remarkable hardness and have some implications for designing novel biomaterials.

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“…Lungfish tooth plates are made up of a number of different tissues, each integral to the structure, growth and function of the tooth plate (Kemp, 2001(Kemp, , 2003Barry and Kemp, 2007;Kemp and Barry, 2006;Lison, 1941;Ishiyama and Teraki, 1990). Most of the tooth plate is made up of interdenteonal dentine containing sparse cell processes and transected by denteons lined by circumdenteonal dentine.…”

Section: Denteons and Dermal Papillaementioning

confidence: 99%

Skin structure in the snout of the Australian lungfish, Neoceratodus forsteri (Osteichthyes: Dipnoi)

Kemp¹

2014

Tissue and Cell

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Many fossil lungfish have a system of mineralised tubules in the dermis of the snout, branching extensively and radiating towards the epidermis. The tubules anastomose in the superficial layer of the dermis, forming a plexus consisting of two layers of vessels, with branches that expand into pore canals and flask organs, flanked by cosmine nodules where these are present. Traces of this system are found in the Australian lungfish, Neoceratodus forsteri, consisting of branching tubules in the dermis, a double plexus below the epidermis and dermal papillae entering the epidermis without reaching the surface. In N. forsteri, the tubules, the plexus and the dermal papillae consist of thick, unmineralised connective tissue, enclosing fine blood vessels packed with lymphocytes. Tissues in the epidermis and the dermis of N. forsteri are not associated with deposits of calcium, which is below detectable limits in the skin of the snout at all stages of the life cycle. Canals of the sensory line system, with mechanoreceptors, are separate from the tubules, the plexus and the dermal papillae, as are the electroreceptors in the epidermis. The system of tubules, plexus, dermal papillae and lymphatic capillaries may function to protect the tissues of the snout from infection.

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The fine structure and formation of hypermineralized petrodentine in the tooth plate of extant lungfish (Lepidosiren paradoxa and Protopterus sp.).

Cited by 21 publications

References 19 publications

Mechanical properties and adaptations of some less familiar bony tissues

Mechanical properties and adaptations of some less familiar bony tissues

A unique mineralization mode of hypermineralized pleromin in the tooth plate of Chimaera phantasma contributes to its microhardness

Skin structure in the snout of the Australian lungfish, Neoceratodus forsteri (Osteichthyes: Dipnoi)

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