Search results
Results from the WOW.Com Content Network
The lingual groove runs from the more distal of the central pits in the central groove toward the lingual surface between the mesiolingual and distolingual cusps. The buccal groove runs from the more mesial of the central pits in the central groove toward the buccal surface between the mesiobuccal and distobuccal cusps ending in the buccal pit.
Unlike the anterior teeth and premolars, molars do not exhibit facial developmental depressions. Evidence of lobe separation can be found in the central groove, which divides buccal from lingual lobes. The two lingual lobes are separated by the distolingual groove, and the two buccal lobes are divided by the buccal groove. [1]
However, this term has been incorrectly used for both buccal and labial, being also applied to the side of a tooth that is adjacent to (or the direction toward) the inside of the cheek (instead of the more accurate term, vestibular). [1] [3] [4] Gingival The direction toward the gingiva (gums), synonymous with cervical and similar to apical.
The groove pattern is shaped like a “Y” with the tail pointed to the lingual and placed between the distolingual and mesiolingual cusps one third of the distance form the distal to the mesial. The contacts with the adjacent teeth are positioned buccal to the midpoint. Viewed from the buccal the buccal cusp tip is centered mesiodistally.
Triangular ridges are those that project from the cusp tips of premolar and molars to the central groove. Transverse ridges are formed by the union of two triangular ridges on posterior teeth. The joining of buccal and lingual triangular ridges is usually named as an example. The oblique ridge is found on the occlusal surfaces of maxillary molars.
Lingual cusp is smaller than the buccal cusp but better developed. The lingual and buccal cusp is separated by a well defined mesiodistal occlusal fissure; The lingual cusp is divided into two; the mesiolingual and distolingual cusps with the mesiolingual cusp being higher and wider than the distolingual.
It takes about 3 years for the adult premolar and its root to fully calcify. Due to its long buccal root with narrow root canal and short palatal root with wide root canal, the upper 1st premolar is very prone to fracture during exodontia, hence, it is sometimes referred to some dentists as the "King of Fracture".
Mandibular right first molar. The Lewis offset is a term for the portion of the central groove on a permanent mandibular first molar which lies between the two central pits.