torsion (redirected from Torsion (mathematics))

torsion /tor·sion/ (tor´-shun)

1. the act or process of being twisted or rotated about an axis.

2. a type of mechanical stress, whereby the external forces twist an object about its axis.

3. in ophthalmology, any rotation of the vertical corneal meridians.tor´sionaltor´sive

---

tor·sion (tôrshn)

n.

1. A twisting or rotation of a part on its long axis.

2. Twisting of the cut end of an artery to arrest hemorrhage.

3. Ocular rotation around the anteroposterior axis.

---

torsion·al adj.

---

Torsion

the action of twisting

Mentioned in: Ovarian Torsion

---

torsion

[tôr′shən]

Etymology: L, torquere, to twist

1 the process of twisting in a positive (clockwise) or negative (counterclockwise) direction.

2 the state of being turned.

3 (in dentistry) the twisting of a tooth on its long axis.

---

torsion,

n 1., motion or state of torque in which one end of an anatomical component is twisted about its longitudinal axis as the opposite end is either immobile or moves in the opposite direction.
2., any motion around an anteroposterior axis of the sphenobasilar synchondrosis that extends outside the normal range of motion.

torsion, forward,

n condition in which the sacrum rotates about an oblique axis so that sacral base side opposite to the axis involved glides anteriorly, producing a deep sulcus.

torsion, left-on-left (forward) sacral,

n condition in which left rotation of the sacrum occurs about a left oblique axis.

torsion, left-on-right (backward) sacral,

n condition in which left rotation occurs about a right oblique axis.

torsion, right-on-left (backward),

n condition in which right rotation occurs about a left oblique axis.

torsion, right-on-right (forward),

n condition in which right rotation occurs about a right oblique axis.

torsion, sacral (saˑ·krl tōrˑ·shn),

n 1., normal function of the sacrum, during walking and forward bending.
2., a dysfunctional condition of the sacrum, in which twisting between the hipbones and the sacrum occurs about a diagonal axis.

torsion, SBS,

n rotation of the occipital and sphenoid bones in opposing directions about an anteroposterior axis. May either be right or left, depending on which greater wing of the sphenoid bone is superior in position. Also called
sphenobasilar synchondrosis (symphysis) torsion.

---

torsion (tôr´shn),

n in dentistry the twisting of a tooth on its long axis. Also, the loading of a wire by twisting it along its long axis.

torsion, clasp,

n the twisting of the retentive clasp arm on its long axis. A retentive clasp may be formed so that it traverses a vertical distance before encircling the abutment to increase the torsion component of the clasp opening as compared with the flexure it experiences.

---

torsion

1. the act of twisting, e.g. of an artery in hemostasis.

2. the state of being twisted. For specific torsions see abomasal, cecal, colonic, gastric, liver, mesenteric, splenic, testicular, uterine.

---

torsion 

Rotation of an eye about an anteroposterior axis. If the upper pole of the vertical meridian of the cornea appears to rotate inward, it is called intorsion, and outward, extorsion. If the eye rotates to the right it may be called dextrotorsion and if it rotates to the left it may be called laevotorsion. It may occur as a result of a head tilt, extraocular muscle weakness or rotation of the eye to a tertiary position. Syn. cycloductin; cyclorotation; torsional movement. See Donder's law; tertiary position; incongruous hemianopia.