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Dental Histology

Chapter 17 Premolars

QuestionAnswer
How many premolars are in the dentition? 8
Are premolars succedaneous or nonsuccedaneous? Succedaneous
What are the functions of the premolars? Assist the molars in grinding food, Assist the canines in piercing food, maintain the face structure at the labial commissure, also involved in speech.
What makes up the occlusal table? marginal ridges, triangular ridges, developmental grooves, and occlusal pits.
Where is the height of contour for premolars on the buccal side? The cervical third
Where is the height of control for premolars on the lingual side? middle third.
How many roots does the max. first premolar have? Two.
Do all premolars of proximal root concavities? Yes
Why are some premolars removed? Improve dental arch spacing
If premolars need to be extracted what premolar gets extracted? First premolars
In the maxillae what premolar is larger? First Premolar
In the mandible what premolar is larger? Second premolar
What premolars erupt first? Maxillary first premolar
What is the proximal crown outline of the maxillary premolars? Trapezoidal- four sided
How many developmental lobes does the maxillary premolars have? Four. Three buccal and one lingual.
In the maxillary premolars where is the crown in position to the root? Centered over the root creating zero lingual inclination
Do the premolars have a larger buccolingual width or mesiodistal width? Buccolingual
How many cusps do the max. premolars have? Two cusps
What are some clinical considerations for the maxillary premolars? They could potentially grow up into the maxillary sinus.
When do the maxillary first premolars erupt? 10-11 years
When does the root complete on the max. first premolars? 12-13 years
On the maxillary first premolar what cusp is higher? The buccal cusp.
How many furcations does the max. first premolars have, and where are they located? Two furcations on the mesial and distal surfaces on the root surfaces?
How many pulp horns and pulp canals are in bifurcated premolars? Two pulp horns and two pulp canals.
What is the shape of the occlusal surface on the max. first premolar? Hexagonal-six sided
What cusp planes function during occlusion on the max. first premolar? mesiolingual and distoliwngual.
Which way does the central groove extend on the max. first premolar? mesiodistally.
On the max. first premolar the central groove connects...? The occlusal pits, mesially pits, and distal pits.
When does the max. second premolars erupt? 10-12 years
When does the root complete on the max. second premolars? 12-14 years
How many roots does the max. second premolar have? One.
How many pulp horns and pulp canal does the max. second premolars have? Two pulp horns, one pulp canal
Is the central groove longer or shorter on the max. second premolar or the max. first premolar? Shorter
Why is the max. second premolar have a more "wrinkled" appearance than the max. first premolar? The max. second premolar has more supplemental grooves.
Is the mand. first premolar larger or smaller than the mand. second premolar? smaller
Do the mand. first premolars have a lingual inclination on the proximal view? yes.
How many cusps are present on the mand. premolars? Two or more.
When do the mand. first premolars erupt? 10-12 years
When does the root complete on the mand. first premolars? 12-13 years
What cusp is the functional cusp on the mand. first premolar? The buccal cusp.
The lingual cusp on the mand. first premolar resembles what to a mand. canine? Cingulum
The roots of a mand. first premolar are, larger and longer/smaller and shorter compared to the mand. second premolar? smaller and shorter
How many pulp horns and pulp canals are present in the mand. first premolar? Two pulp horns, one pulp canal.
What does the term "snake eyes" refer to on the mand. first premolars? Class I amalgam restorations that fill the mesial and distal occlusal pits.
When does the mand. second premolars erupt? 11-12 years
When does the root complete on the mand. second premolars? 13-14 years
What cusp types are there for the mand. second premolars? Two cusp and three cusp
How common is three cusp type on the mand. second premolars? 55%
How common is two cusp type on the mand. second premolars? 45%
How many developmental lopes does a mand. second premolar THREE cusp type have? 5 developmental lopes, three buccal two lingual.
What is the shape of the apex for the mand. second premolars? blunt apex.
How many pulps horns does the three cusp have and two cusp? Three cusp=three pulp horns, two cusp=two pulp horns.
What is the most common shape of the three cusp crown? Square.
What shape does the central groove from on the three cusp type? Y shape
What shape does the central groove form on the two cusp type? H shape.
Created by: Strobelight95