Torus

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torus

[′tȯr·əs]
(anatomy)
A rounded protuberance occurring on a body part.
(botany)
The thickened membrane closing a bordered pit.
(mathematics)
The surface of a doughnut-shaped object.
The topological space obtained by identifying the opposite sides of a rectangle.
The group which is the product of two circles.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Torus

 

a geometric solid formed by the rotation of a circle about a line lying in the plane of the circle but not intersecting the circle (see Figure 1). A torus is shaped approximately like a doughnut or a life ring. If the radius of the rotating circle is r and

Figure 1

the distance from the center of the circle to the axis of rotation is a, then the area of the surface of the torus is 4π2ar and the volume of the torus is 2π2ar2. The term “torus” is also applied to the surface bounding such a solid.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

torus

torus molding
torus
A bold projecting molding, convex in shape, generally forming the lowest member of a base over the plinth.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
A study carried out in Karachi, Pakistan, yielded the same results showing frequency of torus palatinus as 3.7% of patients out of which 35.3% were males and 64.7% were females.10
However, a study conducted among edentulous patients in Saudi Arabia found male predominance, showing the percentage of males with either tori, higher (19.0%), when compared to females (15.94%).13 Another study conducted in Jordan reported the frequency of torus palatinus and Torus mandibularis as 3.1%, and 2.3% respectively.
Frequency of torus palatinus was found higher as compared to torus mandibularis.
Torus Palatinus and Torus Mandibularis: a review of the literature.
Key: n= total number of subjects TP= Torus palatinus
Out of 34 subjects having torus palatinus, 12 (35.3 Percent) were small, 15 (44.2 Percent) were medium and 7 (20.6 Percent) were large sized.
Whereas a study done in Turkey in 200828 reported greater num- ber of flat shaped tori ( 62.7 Percent) as by other studies cited in the literature.28-31 The same reasons may stand true for variety of results in this aspect of torus palatinus. Nutrional factors like consumption of higher unsatur- ated fatty acids and vitamin D have also been explored to have a role in bone growth, thus, affecting the results for prevalence, shape and size of tori.32
Oral tori in general and torus palatinus in particu- lar, complicate prosthetic treatment.
Torus palatinus. Am J Phys Anthropol 1950;8:81-111.
Genetic influence on the prevalence of torus palatinus. Am J Med Genet 1998;75: 138-40.
Morphology and incidence o torus palatinus and mandibularis in Brazillian Indians.
Is torus palatinus a feature of a well-developed maxilla.