abrasion of coin - meaning and definition. What is abrasion of coin
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What (who) is abrasion of coin - definition

LOSS OF TOOTH SUBSTANCE BY MECHANICAL CONTACT WITH OBJECTS OTHER THAN TOOTH-TOOTH CONTACT
Relative dentin abrasivity; Tooth abrasion; Relative dentin abrasion; Radiotracer dentin abrasion; Radioactive dentin abrasion
  • Abrasion occurring on the cervical margins from the effects of friction from toothbrushing and abrasive toothpastes

Abrasion collar         
Abrasion rim; Abrasion ring; Bullet wipe
An abrasion collar, also known as an abrasion ring or abrasion rim, is a narrow ring of stretched, abraded skin immediately surrounding projectile wounds, such as gunshot wounds. It is most commonly associated with entrance wounds and is a mechanical defect due to a projectile's penetration through the skin.
Air abrasion         
Air abrasion (dental); Dental air abrasion
Air abrasion is a dental technique that uses compressed air to propel a thin stream of abrasive particles—often aluminum oxide or silica—through a specialized hand-piece to remove tooth tissue and decay before being suctioned away, similar to sand blasting. It can be used in a variety of dental procedures, including removing tooth decay, stains, and old restorations, as well as to prepare teeth for new restorations, sealants, and bonding.
Coin flipping         
  • tossing for innings]].
  • The coin toss at the start of [[Super Bowl XLIII]]
  • Navy-Notre Dame coin toss
  • Pompey the Great]] on the obverse and a ship on the reverse
PRACTICE OF THROWING A COIN IN THE AIR TO CHOOSE BETWEEN TWO ALTERNATIVES
Heads or Tails; Head and Tail; Cross and Pile; Coin-tossing problem; Coin tossing; Coin toss; Coin flip; Coin-tossing; Coin throw; Tossing a coin; Indian or Wheat; Heads or tails; Flipping a coin; Cross and pile; Coin flips; Heads or Tails?; Coin-flip; Flip a coin; Coin-flipping; Coin Toss; Coin-toss; Toss of a coin; Cointoss
Coin flipping, coin tossing, or heads or tails is the practice of throwing a coin in the air and checking which side is showing when it lands, in order to choose between two alternatives, heads or tails, sometimes used to resolve a dispute between two parties. It is a form of sortition which inherently has two possible outcomes.

Wikipedia

Abrasion (dental)

Abrasion is the non-carious, mechanical wear of tooth from interaction with objects other than tooth-tooth contact. It most commonly affects the premolars and canines, usually along the cervical margins. Based on clinical surveys, studies have shown that abrasion is the most common but not the sole aetiological factor for development of non-carious cervical lesions (NCCL) and is most frequently caused by incorrect toothbrushing technique.

Abrasion frequently presents at the cemento-enamel junction and can be caused by many contributing factors, all with the ability to affect the tooth surface in varying degrees.

The appearance may vary depending on the cause of abrasion, however most commonly presents in a V-shaped caused by excessive lateral pressure whilst tooth-brushing. The surface is shiny rather than carious, and sometimes the ridge is deep enough to see the pulp chamber within the tooth itself.

Non-carious cervical loss due to abrasion may lead to consequences and symptoms such as increased tooth sensitivity to hot and cold, increased plaque trapping which will result in caries and periodontal disease, and difficulty of dental appliances such as retainers or dentures engaging the tooth. It may also be aesthetically unpleasant to some people.

For successful treatment of abrasion, the cause first needs to be identified and ceased (e.g. overzealous brushing). Once this has occurred, subsequent treatment may involve the changes in oral hygiene, application of fluoride to reduce sensitivity, or the placement of a restoration to help prevent further loss of tooth structure and aid plaque control.