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Deciduous teeth develop during the embryonic stage of development and erupt (break through the gums and become visible in the mouth) during infancy. They are usually lost and replaced by permanent teeth, but in the absence of their permanent replacements, they can remain functional for many years into adulthood.
The deciduous mandibular central incisors, shown here in the mouth of a seven-month-old female infant, are the first teeth to erupt. Bottom teeth of a seven-year-old, showing primary teeth (left), a lost primary tooth (middle), and a fully erupted permanent tooth (right)
Teeth can belong to one of two sets of teeth: primary ("baby") teeth or permanent teeth. Often, "deciduous" may be used in place of "primary", and "adult" may be used for "permanent". "Succedaneous" refers to those teeth of the permanent dentition that replace primary teeth (incisors, canines, and premolars of the permanent dentition).
Primary teeth erupt into the mouth from around six months until two years of age. These teeth are the only ones in the mouth until a person is about six years old. At that time, the first permanent tooth erupts. This stage, during which a person has a combination of primary and permanent teeth, is known as the mixed stage.
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 into the mouth, the teeth are in the mixed (or transitional) dentition.
The frequency for ankylosis to happen in deciduous teeth is far more frequent than that in permanent teeth, with a ratio of about 10 to 1, and the majority of [4] the ankylosed teeth occur in lower teeth, about twice as often as in the upper teeth. [6] Therefore, it is strongly believed that their incidence may be due to different causes.
The first permanent tooth usually appears in the mouth at around 5-6 years of age, and the mouth will then be in a transition time with both primary (or deciduous dentition) teeth and permanent teeth during the mixed dentition period until the last primary tooth is lost or shed.
Avulsions of primary teeth are more common in young children as they learn to move independently (walk and run) and also from child abuse. Avulsed deciduous (primary) teeth should not be replanted. Deciduous teeth are not replanted because of the risk of damaging the developing permanent tooth germ. Pulp necrosis with draining fistula, crown ...
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