premolar n : a tooth having two cusps or points; located between the incisors and the molars [syn: bicuspid]
- Rhymes: -əʊlə(r)
- Czech: třenový zub, třenák (colloquial)
- Japanese: 小臼歯
- Polish: przedtrzonowiec
The premolar teeth or bicuspids are transitional teeth located between the canine and molar teeth. In humans, there are two premolars per quadrant, making eight premolars total in the mouth. They have at least two cusps. Premolars can be considered as a 'transitional tooth' during chewing, or mastication. It has properties of both the anterior canines and posterior molars, and so food can be transferred from the canines to the premolars and finally to the molars for grinding, instead of directly from the canines to the molars.
The premolars in humans are the maxillary first premolar, maxillary second premolar, mandibular first premolar, and the mandibular second premolar.
There is always one large buccal cusp, especially so in the mandibular first premolar. The lower second premolar almost always presents with two lingual cusps.
Premolar teeth by definition are permanent teeth distal to the canines preceded by deciduous molars. In primitive mammals there are four premolars per quadrant. The most mesial two have been lost in New World monkeys, apes, and humans. Paleontologists refer to human premolars as Pm3 and Pm4.
Image:Illu mouth.jpg|Mouth (oral cavity)
premolar in Min Nan: Sió-āu-chan
premolar in Catalan: Dent premolar
premolar in German: Prämolar
premolar in Dhivehi: ބޭރު ކޮލުދަތްތައް
premolar in Spanish: Premolar
premolar in French: Prémolaire
premolar in Italian: Premolare
premolar in Lithuanian: Kapliai
premolar in Dutch: Premolaar
premolar in Japanese: 小臼歯
premolar in Norwegian: Forjeksel
premolar in Polish: Ząb przedtrzonowy
premolar in Serbian: Преткутњаци
premolar in Swedish: Premolarer
premolar in Telugu: అగ్రచర్వణకాలు