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Because of the lack of opposing force and the natural eruptive potential of the tooth there is a tendency for the tooth to erupt out of the line of the occlusion. [citation needed] Not all teeth lacking an opposing tooth overerupt, even in the long term. [2] Unopposed upper jaw molars overerupt more than the unopposed lower jaw molars.
Although researchers agree that tooth eruption is a complex process, there is little agreement on the identity of the mechanism that controls eruption. [1] There have been many theories over time that have been eventually disproven. [2]
Over-eruption of the opposing tooth into the unoccupied space left by the stalled eruption of a tooth is a risk factor to operculum trauma from biting. Teeth that fail to erupt completely (commonly the lower mandibular third molars) are often the result of limited space for eruption, or a non-ideal angle of tooth eruption causing tooth impaction.
Pericoronitis is inflammation of the soft tissues surrounding the crown of a partially erupted tooth. [25] The lower wisdom tooth is the last tooth to erupt into the mouth, and is, therefore, more frequently impacted, or stuck, against the other teeth. This leaves the tooth partially erupted into the mouth, and there frequently is a flap of gum ...
Since the tooth never erupts, however, the dental follicle that surrounds the tooth does not degenerate during eruption, and can develop cysts or uncommon tumors over time. [ 5 ] : 141 Estimates of the incidence of cysts or other neoplasms (almost all benign ) around impacted teeth average at 3%, usually seen in people under the age of 40.
Although tooth eruption occurs at different times for different people, a general eruption timeline exists. Typically, humans have 20 primary (baby) teeth and 32 permanent teeth. [43] Tooth eruption has three stages. The first, known as deciduous dentition stage, occurs when only primary teeth are visible. Once the first permanent tooth erupts ...
[2] [3] This type of failure of eruption has a genetic or familial background precursor as a cause. The prevalence is of PFE is about 0.06% in population. In this type of failure, teeth that are non-ankylosed fail to erupt in the mouth. These teeth do not have a precursor tooth that is blocking their path.
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. That is the total length of the alveolar arch is smaller than the tooth arch (the combined mesiodistal width of each tooth).
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