Permanent Premolars Anatomy Flashcards
Numbers of premolars
Max = # 4, 5, 12, 13
Mand = # 20, 21, 28, 29
Permanent premolars take the place of _____ and are therefore ______ teeth
Deciduous molars
Succedaneous
The first premolars assist :
The canines in shearing or cutting food morsels
All upper and lower premolars….
Support corners of mouth and cheeks to keep them from sagging
Function with molars to masticate foods and maintain the vertical dimension of the face between the nose and the chin
The buccal surfaces of all premolars develop from ________ facial lobes evidenced by _______, ______ depressions separating the buccaneers ridge of the facial surface of the crown from the mesial and distal portions
3, 2, vertical
The lingual surfaces of most premolars develop from ____ lingual lobe
In premolars, this forms ___ lingual cusp
One, one
When compared to mandibular premolars, max 1st and 2nd premolars :
Are much more alike
Have buccal and lingual cusps that are nearly equal in size
Are more oblong in the B-L dimension
Which is the widest premolar?
Max 1st
On the buccal cusp of the max 1st premolar, the mesial cusp ridge is ___ than the distal cusp ridge
This is unique to this permanent tooth and _____
Longer
Primary canines
On the max 1st PM, the buccal cusp tip is placed _____ of the RAL
Slightly distal
On the max 2nd PM, the cusp tip is set to the ___
Mesial cusp ridge is _____ than distal
Mesial
Shorter
_______ (max/mand; 1st/2nd) PM is more likely to have two roots
Max 1st
On the max 1st PM, the lingual cusp is _____ and bends towards the ______
The lingual root is ____ than buccal root
Shorter, mesial
Shorter
On max 2nd PM from a facial view, the lingual cusp is _____ than the lingual cusp of 1st meaning that the cusps are _____
The lingual cusp is offset to the ___
Longer, more nearly equal in size
Mesial
On max 1st PM, there is a prominent ______ located ___ to the contact area
Mesial concavity, cervical
From a proximal view of the max 1st PM, the _____ cusp is noticeably longer than the _____ cusp
Buccal, lingual
On the max 1st PM, what is always present in the proximal view?
Mesial marginal ridge groove
The max 1st premolar is considered very brittle because:
How does this relate to the canine?
Mesial marginal groove, mesial concavity, two spindly roots
Robust canine to protect weaker premolar
The max 2nd PM from the proximal view has ____ root, no _______, no_____, and buccal and lingual cusps ______
1, mesial concavity, mesial marginal groove, nearly equal in size
A triangular ridge is any ridge that
Descends rom the cusp tip of a posterior tooth towards the central part of the occlusal surface
A transverse ridge is
The unions of two triangular ridges crossing transversely across the surface of a posterior tooth
An inclined plane is
The sloping area found between two cusp ridges
The max 1st PM from an occlusal view has a lingual cusp offset to the _____
A long central developmental groove that runs ______, crosses transverse ridge and ends in ______ in the triangular fossae
Mesial
Mesiodistally
Pits
The mesial marginal ridge groove on the max 1st premolars makes the central groove appear
Longer
