WordNet

having two cusps or points (especially a molar tooth); "bicuspid teeth"; "bicuspid leaves" (同)bicuspidate
a tooth having two cusps or points; located between the incisors and the molars (同)bicuspid

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(歯などが)2つの尖(せん)部(突起)を持つ / 小臼歯(きゅうし)
小臼歯 / 小臼歯の

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/07/27 22:34:51」(JST)

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The premolar teeth 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.^[1]^[2]^[3] 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.^[4]

The premolars in humans are the maxillary first premolar, maxillary second premolar, mandibular first premolar, and the mandibular second premolar.^[1]^[3]

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.^[5]

Molar teeth by definition are permanent teeth distal to the canines, preceded by deciduous premolars.^[6] In primitive placental mammals there are four premolars per quadrant. The most mesial two have been lost in Catarrhines (Old World monkeys and apes, including humans). Paleontologists refer to human premolars as Pm3 and Pm4.^[7]

Additional images[edit]

Mouth (oral cavity)

Left maxilla. Outer surface.

Base of skull. Interior surface.

References[edit]

^ ^a ^b Roger Warwick & Peter L. Williams, ed. (1973), Gray’s Anatomy (35th ed.), London: Longman, pp. 1218–1220
^ Weiss, M.L., & Mann, A.E (1985), Human Biology and Behaviour: An anthropological perspective (4th ed.), Boston: Little Brown, pp. 132–135, 198–199, ISBN 0-673-39013-6
^ ^a ^b Glanze, W.D., Anderson, K.N., & Anderson, L.E, ed. (1990), Mosby's Medical, Nursing, and Allied Health Dictionary (3rd ed.), St. Louis, Missouri: The C.V. Mosby Co., p. 957, ISBN 0-8016-3227-7
^ Weiss, M.L., & Mann, A.E. (1985), pp.132-134
^ Warwick, R., & Williams, P.L. (1973), p.1219.
^ Warwick, R., & Williams, P.L. (1973), pp.1218-1219.
^ Christopher Dean (1994). "Jaws and teeth". In Steve Jones, Robert Martin & David Pilbeam (eds.). The Cambridge Encyclopedia of Human Evolution. Cambridge: Cambridge University Press. pp. 56–59. ISBN 0-521-32370-3. Also ISBN 0-521-46786-1 (paperback)

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「小臼歯」

Premolar
	The permanent teeth, viewed from the right.
	Permanent teeth of right half of lower dental arch, seen from above.
Latin	dentes premolares
Gray's	subject #242 1118
MeSH	Premolar