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The lower second premolar almost always presents with two lingual cusps. [6] The lower premolars and the upper second premolar usually have one root. The upper first usually has two roots, but can have just one root, notably in Sinodonts, and can sometimes have three roots. [7] [8] Premolars are unique to the permanent dentition.
The upper first premolar is considered the pontic and the teeth prepared are abutments. Conventional bridges are bridges that are supported by full-coverage crowns , three-quarter crowns, post-retained crowns, onlays and inlays on the abutment teeth.
In the universal system of notation, the permanent maxillary premolars are designated by a number. The right permanent maxillary first premolar is known as "5", and the left one is known as "12". In the Palmer notation, a number is used in conjunction with a symbol designating in which quadrant the tooth is found. For this tooth, the left and ...
Humans have four types of teeth: incisors, canines, premolars, and molars, which each have a specific function. The incisors cut the food, the canines tear the food and the molars and premolars crush the food. The roots of teeth are embedded in the maxilla (upper jaw) or the mandible (lower jaw) and are covered by gums. Teeth are made of ...
The dental arches are the two arches (crescent arrangements) of teeth, one on each jaw, that together constitute the dentition.In humans and many other species, the superior (maxillary or upper) dental arch is a little larger than the inferior (mandibular or lower) arch, so that in the normal condition the teeth in the maxilla (upper jaw) slightly overlap those of the mandible (lower jaw) both ...
The right permanent maxillary first molar is known as tooth "3", and the left permanent maxillary first molar is known as tooth "14". In the Palmer notation, a number and symbol are used to identify the tooth. The number identifies the tooth position relative to the midline, and the symbol identifies the quadrant of the mouth.
To prevent uncertainty or ambiguity, teeth may be indicated using more than one notation, particularly when referring for an extraction; this makes it less likely for the incorrect tooth to be needlessly extracted. For instance, a dentist may give an instruction to "extract the 24 (UL4)" for the upper left first premolar tooth.
For this tooth, the left and right canines would have the same number, "3", but the right is designated with the symbol "┘" under the number, and the left one likewise with "└". The international notation has a different numbering system from the other two, and the right permanent maxillary canine is known as "13" and the left "23".