What is a Denticle in biology?

What is a Denticle in biology?

A denticle is any small tooth-like or bristle-like structure. Denticle (tooth feature), serrations on the teeth of dinosaurs, lizards, sharks, and mammals. Dermal denticles or placoid scales, in cartilaginous fishes. Pulp stone or endolith, a calcified mass in the pulp of a tooth.

What is a Denticle in dentistry?

Denticles, also called serrations, are small bumps on a tooth that serve to give the tooth a serrated edge. In paleontology, denticle characteristics such as size and density (denticles per unit distance) are used to describe and classify fossilized teeth, especially those of dinosaurs.

What are denticles for?

The main function of these denticles is for protection against predators, kind of like a naturally occurring chainmail armor, although in some sharks they have a hydrodynamic function. The denticles reduce turbulence and drag which allows the shark to swim faster and covertly.

What is a Denticle on a coin?

According to every definition of the word that I’ve found, denticles are the tooth-like design sometimes found around a coin’s perimeter. But some coins have a similar design element that circles the perimeter that aren’t tooth- or saw-like, i.e. dots around the perimeter, such as is on the Canadian silver dollars.

Are pulp stones rare?

True pulp stones are quite rare. On the other hand, false pulp stones are made up of concentric layers of mineralised tissue around blood thrombi, collagen fibres, or dying and dead cells.

Do sharks have Ganoid scales?

description. , sharks) have placoid scales, which are bony, spiny projections with an enamel-like covering. Ganoid scales, which are found on such fishes as gars and the bowfin, are similar to placoid scales but are covered with a peculiar enamel-like substance called ganoin.

Does a pulp stone need to be removed?

Pulpal stone can be problematic in the treatment of root canals. Radiographs provide a useful aid to detect early cases of pulp stones and so with correct understanding, risk assessing and correct technique, they can be carefully removed and thus enable efficient root canal treatment.

What is cause Hypercementosis?

Hypercementosis is excessive deposition of cementum on the tooth roots. In most cases, its cause is unknown. Occasionally, it appears on a supraerupted tooth after the loss of an opposing tooth. Another cause of hypercementosis is inflammation, usually resulting from rarefying or sclerosing osteitis.

Why do coins have Denticles?

Denticles Help Protect the Design One reason coins are designed with a rim is to help mitigate the speed with which a design wears away over the course of the coin’s time in circulation. Denticles can only help further protect a coin’s main design from wearing into oblivion through everyday use in commerce.

Why do we get pulp stones?

pulp degeneration. increasing age. circulatory disturbances within the pulp. long standing local irritants such as dental caries, pulp-capping procedures, healed tooth fractures, tooth injury restorations and periodontal diseases.

What is the meaning of the word denticle?

Webster Dictionary (0.00 / 0 votes) Rate this definition: Denticle noun. a small tooth or projecting point. Etymology: [L. denticulus a little tooth, dim. of dens, dentis, tooth. See Dental, and cf. Dentelli.]

What is the function of a dermal denticle?

What Dermal Denticles Do. The main function of these denticles is for protection against predators, kind of like a naturally occurring chainmail armor, although in some sharks they have a hydrodynamic function.

How are denticles similar to scales and teeth?

Dermal denticles (placoid scales) are tough “scales” that cover the skin of elasmobranchs (sharks and rays). Even though denticles are similar to scales, they are actually just modified teeth and are covered with a hard enamel.

What are the functions of denticles in sharks?

The main function of these denticles is for protection against predators, kind of like a naturally occurring chainmail armor, although in some sharks they have a hydrodynamic function. The denticles reduce turbulence and drag which allows the shark to swim faster and covertly.