Max Premolars Flashcards
At what age do maxillary premolars typically erupt?
10-12 years
Why are premolars called bicuspids?
Because most of them have two cusps: one buccal and one lingual.
What is the general shape of the crown outline in the buccal aspect of maxillary 1st premolars?
Pentagon shaped.
What is the exception in the cusp ridge length of maxillary 1st premolars?
The mesial cusp ridge is longer than the distal cusp ridge.
What is a distinguishing feature of the maxillary 1st premolar’s mesial surface?
Presence of a mesial marginal developmental groove extending to the root.
How many roots do most maxillary 1st premolars have?
Two roots: one buccal and one lingual.
What is the shape of the crown outline from the mesial aspect?
Trapezoidal.
Where is the buccal cusp tip positioned relative to the apex in maxillary 1st premolars?
In line with the apex of the buccal root.
How do the lingual and buccal cusp tips of maxillary 1st premolars differ?
The buccal cusp is sharper and 1 mm longer than the lingual cusp.
What is a unique feature of the occlusal surface of the maxillary 1st premolar?
Presence of a transverse ridge formed by the meeting of buccal and lingual triangular ridges.
How does the central developmental groove of the maxillary 2nd premolar differ from that of the 1st?
It is shorter, approximately 2 mm wide.
What is the root structure of the maxillary 2nd premolar?
Usually a single conical root.
What distinguishes the lingual cusp of the maxillary 2nd premolar?
It is sharp and positioned mesial to the midroot axis line.
What is notable about the occlusal surface of the maxillary 2nd premolar?
It has numerous supplemental grooves, giving it a wrinkled appearance.
How do the mesial and distal marginal ridges generally compare?
The mesial marginal ridge is more occlusal, and the distal marginal ridge is more cervical.
