Mandibular first molar
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2008-05-20T16:31:13Z
Glucose6phosphate
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{{Teeth|
toothpicture=Image:Mandibular first molars01-01-06.png|
text=Mandibular first molars of permanent and primary teeth marked in red.|
}}
The '''mandibular first molar''' (also known as 6 yr molar) is the [[tooth]] located distally (away from the midline of the [[face]]) from both the [[mandibular second premolar]]s of the [[mouth]] but mesial (toward the midline of the face) from both [[mandibular second molar]]s. It is located on the mandibular (lower) arch of the mouth, and generally opposes the maxillary (upper) first molars and the maxillary 2nd premolar in normal class I occlusion. The function of this [[Molar (tooth)|molar]] is similar to that of all molars in regard to grinding being the principal action during [[mastication]], commonly known as chewing. There are usually five well-developed [[cusp]]s on mandibular first molars: two on the buccal (side nearest the cheek), two palatal (side nearest the [[palate]]), and one distal. There are great differences between the [[deciduous teeth|deciduous]] (baby) mandibular molars and those of the permanent mandibular molars, even though their function are similar. It is important to note that the permanent mandibular molars are not considered to have any teeth that precede it. Despite being named molars, the deciduous molars are followed by permanent premolars.
In the [[Universal numbering system (dental)|universal system of notation]], the deciduous mandibular first molars are designated by a letter written in uppercase. The right deciduous mandibular first molar is known as "S", and the left one is known as "L". The international notation has a different system of notation. Thus, the right deciduous mandibular first molar is known as "84", and the left one is known as "74".
In the universal system of notation, the permanent mandibular first molars are designated by a number. The right permanent mandibular first molar is known as "30", and the left one is known as "19". The [[Palmer notation]] uses a number in conjunction with a symbol designating in which quadrant the tooth is found. For this tooth, the left and right first molars would have the same number, "6", but the right one would have the symbol, "┐", over it, while the left one would have, "┌". The international notation has a different numbering system than the previous two, and the right permanent mandibular first molar is known as "46", and the left one is known as "36".
Mandibular primary first molars usually have four pulp horns.
==References==
*Ash, Major M. and Stanley J. Nelson, 2003. ''Wheeler’s Dental Anatomy, Physiology, and Occlusion.'' 8th edition.
[[Category:Teeth]]
[[nl:Eerste molaar]]
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