Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «T»:
Tooth and nail syndrome
Tooth and nail syndrome: A genetic disorder characterized by the absence of several teeth at birth and abnormalities of the nails. The disorder is also known as hypodontia and nail dysgenesis or Witkop syndrome (TNS). It was first described by Dr. Carl Witkop in 1965.
The tooth and nail defects in...
Tooth erosion: Tooth erosion
is a gradual loss of the normally hard surface of the tooth due to chemical,
not bacterial, processes.
Erosion is an eating away of a surface. The word "erosion" comes from the Latin "erodere" meaning to eat out....
Tooth numbering: The accordance of a unique number to each tooth. The Universal/National System for permanent (adult) dentition (1-32) includes: (1) is the patient's upper right molar and follows around the upper arch to the upper left third molar (16), descending to the lower left third molar (17) ...
Tooth root: The lower two-thirds of a tooth.
The roots are normally buried in bone, and serve to anchor
the tooth in position. They are covered with a thin layer
of bone, and insert into sockets in the bone of the jaw....
Tooth root sensitivities
Tooth root sensitivities: Oversensitivity of exposed
roots of teeth to cold, hot, and sour foods because those roots are no longer protected by
healthy gum and bone. Chronic gum disease contributes to toothache due to root
sensitivities. The roots are the lower 2/3 of the teeth that are normally bur...
Tooth, cracked, syndrome
Tooth, cracked, syndrome: A toothache caused by a
broken tooth (tooth fracture) without associated cavity or advanced gum disease. Biting on
the area of tooth fracture can cause severe sharp pains. These fractures are usually due
to chewing or biting hard objects such as hard candies, pencils, nuts,...
Tooth, wisdom: One of the large molars in the very
back of the jaw. The human jaw has changed in size over the
course of evolution, and wisdom teeth are no longer needed, but these teeth continue to erupt in many people. If the jaw is too small to accommodate them, they may cause pain or crowd ot...
Toothache: Pain in or near a tooth. Also called odontalgia. The most common cause of a toothache is a dental cavity. The second most common cause is gum disease. Toothache can be caused by a problem that does not originate from a tooth or the jaw....
Tophaceous gout: A chronic form of gout. Nodular
masses of uric acid crystals
(tophi) are deposited in different soft tissue areas of the body.
Even though tophi are
most commonly found as hard nodules around the fingers, at the tips
of the elbows, and
around the big toe, tophi nodules can appear...
Tophi: The plural of tophus....
Tophus: A nodular mass of uric acid crystals. Tophi are
characteristically deposited in different soft tissue areas of the body in gout. The word
tophus comes via Latin from the Greek tophos meaning a porous volcanic stone. In chronic
(tophaceous) gout, nodular masses of uric acid crystals (tophi) d...
Topical: Pertaining to a particular surface area. A
topical agent is applied to a certain area of the skin and is
intended to affect only the area to which it is applied. Whether its
effects are indeed limited to that area depends upon whether the
agent stays where it is put or is absorbed into...
Topical chemotherapy: Treatment with an anticancer
drug in a lotion, ointment or cream that is applied to the
Topoisomerase: A class of enzymes that alter the supercoiling of double-stranded DNA. (In supercoiling the DNA molecule coils up like a telephone cord, which shortens the molecule.) The topoisomerases act by transiently cutting one or both strands of the DNA. Topoisomerase type I cuts one strand w...
TORCH screen: Screening test for a group of infections known by the acronym TORCH which stands for Toxoplasma gondii; other viruses (HIV, measles, and more); rubella (German measles);cytomegalovirus; and herpes simplex.
All of these infections are teratogens, agents capable of causing birth defects...