What is isthmus in dentistry?
A canal isthmus is generally defined as a narrow, ribbon-shaped communication between two root canals that contains pulp tissue (Weller et al. 1995). The incidence of canal isthmuses varies for type of tooth and level within a given root (Vertucci 1984), but also appears to be age-related (Al Shalabi et al.
What is isthmus in tooth preparation?
The transition between the occlusal and proximal cavity is termed isthmus. This is the narrowest place of preparation and it is of fundamental significance for retention of the filling.
What is an isthmus in endodontics?
Isthmus can be defined as a narrow connection between two root canals in the same root containing pulp tissue1. It has also been described as a web-like connection between two root canals, which can be either complete or incom- plete.
What is the definition for the word isthmus?
Definition of isthmus 1 : a narrow strip of land connecting two larger land areas. 2 : a narrow anatomical part or passage connecting two larger structures or cavities.
What is Enameloplasty dental?
Enameloplasty is a cosmetic dental procedure to remove small amounts of tooth enamel to change a tooth’s size, shape, length, or surface. Enameloplasty is also known as: odontoplasty. tooth recontouring.
What is conservative cavity preparation?
Although conservative tooth preparations may involve the replacement of cusps with a restorative material if it is necessary to prevent tooth fracture, many tooth-conserving restorations are small, as determined by the size of the situation being treated.
Where is an isthmus?
Panama
Unquestionably the two most famous isthmuses are the Isthmus of Panama, connecting North and South America, and the Isthmus of Suez, connecting Africa and Asia.
What does a isthmus look like?
An isthmus is a land bridge, a narrow strip of land that stretches across a body of water to connect two larger land masses. If you look at an example, say the Isthmus of Panama, you can see how that neck-like bit of land separates the Caribbean Sea from the North Pacific Ocean as it connects North and South America.
What causes taurodontism?
Although considered to be a developmental rarity, the precise cause of taurodontism is unknown. Genetic disorders or mutations such as: Amelogenesis imperfecta, a condition affecting the development of tooth enamel. Ectodermal dysplasia, a disorder affecting the skin, hair, nails, teeth, and sweat glands.
What does Anodontia mean?
Anodontia is a genetic disorder defined as the absence of all teeth. It usually occurs as part of a syndrome that includes other abnormalities. Also rare but more common than anodontia are hypodontia and oligodontia.
What is the medical definition of Isthmus?
isthmus of fauces ( isthmus fau´cium) the constricted aperture between the cavity of the mouth and the pharynx. isthmus of rhombencephalon the narrow segment of the fetal brain, forming the plane of separation between the rhombencephalon and cerebrum. isthmus of thyroid the band of tissue joining the lobes of the thyroid.
What is the definition of an isthmus?
The definition of an isthmus is a narrow strip of land that connects two larger bodies of land and is surrounded by water on two sides. An example of an isthmus is a land bridge. YourDictionary definition and usage example.
Is there an isthmus in the United States?
No, not within the United States, but there is an isthmus connecting North America to South America.
What is cardiac isthmus?
In anatomy, isthmus refers to a constriction between organs. This is a list of anatomical isthmi: “Isthmus” the mesencephalon (midbrain)-rhombencephalon (hindbrain) boundary. Cavo-tricuspid isthmus of the right atrium of the heart, a body of fibrous tissue in the lower atrium between the inferior vena cava, and the tricuspid valve.