Maxillary Premolars (permanent) Flashcards
Universal number for maxillary first premolars
5 & 12
What proximal geometric shape does the first permanent maxillary molar have? Tapers which way?
Trapezoidal (tapers occlusally)
What proximal geometric shape does each maxillary posterior tooth have?
Trapezoidal (tapers cervically)
What geometrical shape from the occlusal view does the permanent maxillary first premolar have?
Hexagonal shape
How many developmental lobes does the permanent maxillary first premolar have? What are their names?
4 development lobes (mesiobuccal, distobuccla, mesiolingual, distolingual)
How many cusps does thepermanent maxillary first premolar have?
2 (buccal & lingual)
Which cusp is bigger on a permanent maxillary first premolar?
F > L (but relatively same in size when compared to mandibular first premolar)
What is the primary function of permanent maxillary first premolar?
To assist canine in tearing & piercing
essentially a grinding tooth
When is the initial calcification, enamel competition, eruption, & root competition of permanent maxillary first premolar?
initial calcification 1.5 to 1.75 years
enamel completion 5 - 6 y.
eruption 10 - 11 y.
root completion 12 - 13 y.
Which anterior tooth does the permanent maxillary first premolar resemble?
Canine
Where is the Facial-HOC on a permanent maxillary first premolar?
Cervical Third
True/False –> the Occlusal - Cervical Dimension form the facial view of the permanent maxillary first premolar is longer/greater than the maxillary 2nd premolar?
True
From the facial view, the mesial-HOC of the permanent maxillary first premolar is located where?
Mesial-HOC is at the occlusal-middle thirds
How doe the Mesial and Distal anatomy compare from the facial view of the permanent maxillary first premolar?
Mesial outline has a convexity at HOC and concavity cervically.
Distal outline has greater convexity and less of a concavity.
In which direction does the buccal cusp tip of the permanent maxillary first premolar point from a facial view relative to the midline of the root?
Cusp tip points distally from the midline of the root
Which buccal cusp ridge is longer/shorter on a permanent maxillary first premolar?
Mesialbuccal cusp ridge is longer
Distobuccal cusp ridge is shorter
(opposite for maxillary canine)
In which direction does the lingual cusp tip of the permanent maxillary first premolar point from a lingual view relative to the midline of the root?
Cusp tip points mesially from the midline
lingual cusp is offset to mesial
Where is the lingual-HOC for all posterior teeth?
Middle third
Where is the lingual - HOC for the permanent maxillary first premolar?
Middle third
Which cusp of the all maxillary premolars is the shortest (OC)?
Lingual Cusp of the first permanent maxillary premolar
Are the Buccal(facial) & lingual cusps of the first permanent maxillary premolar centered over the root trunk or are they offset facially / lingually from mesial view?
Facial & Lingual Cusps of the first permanent maxillary premolar are centered over the root trunk from the mesial view
Is there strong mesial marginal groove visible on a first permanent maxillary premolar?
Yes, strong mesial marginal groove
What is one distinguishing or unique feature of the first permanent maxillary premolar from the mesial view in relationship to concavity?
First permanent maxillary premolar have a strong mesial concavity from root trunk to cervical portion of the crown.
Where specifically is the mesial-HOC from the mesial view of the first permanent maxillary premolar?
Mesial HOC is facial to the midline (because buccal cusp is slightly larger than lingual cusp)
Lingual cusp of maxillary first premolar is offset mesially and buccal cusp is offset distally
…
which two teeth have mesial marginal groove?
Mandibular and maxillary first premolar
Compare the mesial and distal marginal ridges on a maxillary first premolar
Distal marginal ridge on a maxillary first premolar is more cervical thus have a shorter OC distance –> more occlusal surface is visible from distal view than mesial
From which view (mesial / distal) of a maxillary first premolar can one see more of the occlusal table
Form distal view (why?)
compare the distal and mesial contact area of a mandibular first premolar
distal contact area is slightly more cervical and facial than mesial on a maxillary first premolar
Mesial marginal ridge is shorter / longer than distal marginal ridge for maxillary first premolar.
Mesial marginal ridge on a maxillary first premolar is shorter than distal marginal ridge
Mesial contact area is more lingual / facial than distal on a maxillary first premolar
Mesial contact area is more lingual than distal on a maxillary first premolar.
which tooth has the deepest central groove of all posterior teeth?
maxillary first premolar
Which angle is acute and which angle is 90 degrees on a maxillary first premolar.
maxillary first premolar distal buccal ridge - distal marginal ridge is an acute angle
mesial buccal ridge - mesial marginal ridge
What is Root Type I and to which tooth does it belong to?
Maxillary first premolar
Cervical root Cross Section = kidney or bean shape
Still has two canals (Facial and Lingual)
What is Root Type II and to which tooth does it belong to?
Maxillary first premolar
Most common form
short root trunk
cervical cross section is bean shaped
What is Root Type III and to which tooth does it belong to?
Maxillary first premolar Longer Root trunk Laminated Root Mid-root cross section is hourglass cervical cross section is bean shaped
In which tooth is trifurcation possible?
Trifurcation is possible in Maxillary first premolar (2 buccal + 1 lingual)
Which tooth is smaller / bigger? Maxillary first or second premolar
Maxillary first premolar is bigger
Which tooth is more rounded / angular ? Maxillary first or second premolar?
Maxillary first is more angular
Maxillary second is more rounded
Are the mesial and distal pits closer or farther apart in maxillary first premolar?
mesial and distal pits are closer together due to shoot central groove on a Maxillary second premolar
Will one see more or less supplemental grooves in maxillary second premolar?
There are more supplemental grooves in maxillary second premolar than maxillary first premolar
IS there mesial concavity or mesial marginal groove present on Maxillary second premolar
No
Which two pair teeth have symmetry on both side?
Mandibular central incisors & maxillary second premolars
Which premolars are most symmetrical?
Maxillary second premolars
DO maxillary second premolar root exhibit depressions?
No, only maxillary first premolar (remember, maxillary second premolar exhibit symmetry so they can’t have any depressions)
