Two cusps type premolar has one large and functional buccal cusp where as lingual cusp
is very small and usually blunt.
The premolar consists of two labial cusps and one lingual cusp
that are somewhat equal in suture.
The lingual cusp
height of corresponding teeth on the left and right cheek tooth rows differed significantly in the skulls with different rostral orientation.
Maxillary lingual cusp
and the lower fossa act as a mortar and pestle in chewing.
splendens with more prominent median accessory cusps; lingual cusp
of P4 not directly opposite the protocone, so that the loph on P4 is not as clear as in L.
palatal cusp of maxillary teeth and buccal cusp of mandibular teeth) and sometimes palatal incline of maxillary buccal cusp & buccal incline of lingual cusp
18) The researchers created class V lesions in 40 extracted teeth, restored them with resin composites, and then subjected the teeth to 150 Newtons of occlusal pressure on the buccal cusps, lingual cusps
and central fossae.
Only the lingual cusps
of the maxillary posterior teeth are in contact with the central fossa during centric occlusion.
The lower first molar has three buccal and two lingual cusps
on its rectangular occlusal surface, the smallest being distobuccal.
12 If the level of occlusal plane is too high, the tongue is unable to lie on the lingual cusps
of the mandibular denture teeth and hence, fails to counter the movement of the denture.
5 Also in narrow transverse skeletal problems the upper molars are compensated naturally in a buccal direction and their lingual cusps
hang down below the curve of Wilson though there may not be a cross bite situation but this may lead to an occlusal interference from the palatal cusps of upper molars.
With brackets placed on lingual surfaces, it is easier to control lingual cusps
through the constant application of buccal root torque (vertical anchorage) which tips molars lingually.