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Ankylosis of deciduous teeth may rarely occur. The most commonly affected tooth is the mandibular (lower) second deciduous molar. Partial root resorption first occurs and then the tooth fuses to the bone. This prevents normal exfoliation of the deciduous tooth and typically causes impaction of the permanent successor tooth.
Impacted wisdom teeth are classified by their direction of impaction, their depth compared to the biting surface of adjacent teeth and the amount of the tooth's crown that extends through gum tissue or bone. Impacted wisdom teeth can also be classified by the presence or absence of symptoms and disease. Screening for the presence of wisdom ...
Impacted wisdom teeth are classified by the direction and depth of impaction, the amount of available space for tooth eruption and the amount of soft tissue or bone that covers them. The classification structure allows clinicians to estimate the probabilities of impaction, infections and complications associated with wisdom teeth removal. [31]
Because impacted teeth do not erupt, they are retained throughout the individual's lifetime unless extracted or exposed surgically. Teeth may become impacted because of adjacent teeth, dense overlying bone, excessive soft tissue or a genetic abnormality. Most often, the cause of impaction is inadequate arch length and space in which to erupt.
Partial melting is the phenomenon that occurs when a rock is subjected to temperatures high enough to cause certain minerals to melt, but not all of them. Partial melting is an important part of the formation of all igneous rocks and some metamorphic rocks (e.g., migmatites), as evidenced by a multitude of geochemical, geophysical and petrological studies.
Impaction may refer to: Impaction (animals), blockage of the digestive tract of animals; Fecal impaction, a solid, immobile bulk of feces or indigestible matter that can develop in the rectum; Dental impaction, the failure of a tooth fully to erupt into the mouth because of obstruction from another tooth; Aerosol impaction
Partial application, in computer science the process of fixing a number of arguments to a function, producing another function; Partial charge or net atomic charge, in chemistry a charge value that is not an integer or whole number; Partial fingerprint, impression of human fingers used in criminology or forensic science
Impaction is bowel obstruction that can occur in various kinds of animals when they consume something that they cannot digest, typically substrate. Once the substance is ingested it will block the digestive tract and, if untreated, cause death.