NOTES ON TOOTH REPLACEMENT IN THE NILE CROCODILE CROCODILUS NILOTICUS
Identifieur interne : 00F174 ( Main/Exploration ); précédent : 00F173; suivant : 00F175NOTES ON TOOTH REPLACEMENT IN THE NILE CROCODILE CROCODILUS NILOTICUS
Auteurs : D. F. G. Poole [Ouganda]Source :
- Proceedings of the Zoological Society of London [ 0370-2774 ] ; 1961-01.
English descriptors
- KwdEn :
- Actual increase, Average tooth size, Crocodile, Crocodile teeth, Crocodilus niloticus, Eruption, First successional teeth, First successional tooth, Functional crown, Functional root, Functional teeth, Functional tooth, General pattern, Growth process, Large part, Lingual, Lingual side, Maximum diameter, Nile crocodile, Pulp cavity, Resorption, Root resorption, Same socket, Second successional germ, Short root, Skull, Socket, Successional, Successional cycle, Successional teeth, Successional tooth, Tooth, Tooth crown, Tooth crowns, Tooth diameter, Tooth diameter length, Tooth form, Tooth replacement, Total number, Various measurements, Vertical ridges, Whole tooth.
- Teeft :
- Actual increase, Average tooth size, Crocodile, Crocodile teeth, Crocodilus niloticus, Eruption, First successional teeth, First successional tooth, Functional crown, Functional root, Functional teeth, Functional tooth, General pattern, Growth process, Large part, Lingual, Lingual side, Maximum diameter, Nile crocodile, Pulp cavity, Resorption, Root resorption, Same socket, Second successional germ, Short root, Skull, Socket, Successional, Successional cycle, Successional teeth, Successional tooth, Tooth, Tooth crown, Tooth crowns, Tooth diameter, Tooth diameter length, Tooth form, Tooth replacement, Total number, Various measurements, Vertical ridges, Whole tooth.
Abstract
The history and replacement of crocodile teeth are described. A new tooth erupts with only a short root which grows downwards into the socket as the pulp cavity in the crown begins to be occluded by the further deposition of dentine. After the root has become fully extended, it is gradually resorbed at its base to make room for an enlarging successional tooth which has been forming on the lingual side of the socket. The successional tooth eventually moves to a position within the partly resorbed functional root and directly under the functional crown. Progressive reduction of the functional root now occurs to accommodate the continuously enlarging successional tooth and, when resorption is largely complete, the functional tooth falls away, allowing the successional tooth, with a short, incomplete root, to take its place. As a result of this successional cycle it is found, within certain limits, that at any given time the form and condition of a functional tooth is related to the size and condition of its successor lying below. Consideration of various measurements made on a series of twenty‐four skulls of different sizes indicates that a regular and continuous replacement of teeth occurs throughout a large part of a crocodile's life. It is estimated that in a crocodile which is thirteen feet long, each tooth is likely to have been replaced forty‐five times.
Url:
DOI: 10.1111/j.1469-7998.1961.tb06083.x
Affiliations:
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Le document en format XML
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<term>Eruption</term>
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<term>First successional tooth</term>
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<term>Root resorption</term>
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<term>Tooth crowns</term>
<term>Tooth diameter</term>
<term>Tooth diameter length</term>
<term>Tooth form</term>
<term>Tooth replacement</term>
<term>Total number</term>
<term>Various measurements</term>
<term>Vertical ridges</term>
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<term>Average tooth size</term>
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<term>Crocodile teeth</term>
<term>Crocodilus niloticus</term>
<term>Eruption</term>
<term>First successional teeth</term>
<term>First successional tooth</term>
<term>Functional crown</term>
<term>Functional root</term>
<term>Functional teeth</term>
<term>Functional tooth</term>
<term>General pattern</term>
<term>Growth process</term>
<term>Large part</term>
<term>Lingual</term>
<term>Lingual side</term>
<term>Maximum diameter</term>
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<term>Socket</term>
<term>Successional</term>
<term>Successional cycle</term>
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<term>Successional tooth</term>
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<term>Tooth crown</term>
<term>Tooth crowns</term>
<term>Tooth diameter</term>
<term>Tooth diameter length</term>
<term>Tooth form</term>
<term>Tooth replacement</term>
<term>Total number</term>
<term>Various measurements</term>
<term>Vertical ridges</term>
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<front><div type="abstract" xml:lang="en">The history and replacement of crocodile teeth are described. A new tooth erupts with only a short root which grows downwards into the socket as the pulp cavity in the crown begins to be occluded by the further deposition of dentine. After the root has become fully extended, it is gradually resorbed at its base to make room for an enlarging successional tooth which has been forming on the lingual side of the socket. The successional tooth eventually moves to a position within the partly resorbed functional root and directly under the functional crown. Progressive reduction of the functional root now occurs to accommodate the continuously enlarging successional tooth and, when resorption is largely complete, the functional tooth falls away, allowing the successional tooth, with a short, incomplete root, to take its place. As a result of this successional cycle it is found, within certain limits, that at any given time the form and condition of a functional tooth is related to the size and condition of its successor lying below. Consideration of various measurements made on a series of twenty‐four skulls of different sizes indicates that a regular and continuous replacement of teeth occurs throughout a large part of a crocodile's life. It is estimated that in a crocodile which is thirteen feet long, each tooth is likely to have been replaced forty‐five times.</div>
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