Mandibular Premolars Flashcards
Do mandibular first and second premolars resemble each other?
No
Which mandibular premolar is usually larger?
2nd
How many lobes does the mandibular first premolar develop from?
4
How many lobes does the mandibular second premolar usually develop from?
4 or 5
Which premolar has a more symmetrical outline, the first or second?
1st
Which mandibular premolar has a larger and pointed buccal cusp?
1st
Which mandibular premolar resembles a canine from the buccal aspect?
1st
Where is the cusp tip located in relation to the long axis on the mandibular first premolar?
The buccal cusp tip is slightly mesial to the long axis on the mandibular first premolar.
Does the mandibular first or second premolar more commonly have a single root?
The mandibular first premolar most commonly has a single root
What is unique about the root of the mandibular second premolar compared to the first?
The mandibular second premolar has a single root that is larger and longer than the first premolar’s root.
Does the mandibular first premolar usually have imbrication lines?
No, the mandibular first premolar usually has no imbrication lines.
Which mandibular premolar has a smooth buccal enamel surface with few developmental grooves?
The mandibular first premolar has a smooth buccal surface with few developmental grooves.
Which mandibular premolar has a shorter buccal cusp?
The mandibular second premolar has a shorter buccal cusp.
Describe the lingual cusp of the mandibular first premolar.
The lingual cusp of the mandibular first premolar is small, non-functional, and does not occlude with maxillary teeth.
Which mandibular premolar has most of its occlusal surface visible from the lingual view?
The mandibular first premolar has most of its occlusal surface visible from the lingual view.
Which mandibular premolar has a mesiolingual developmental groove?
The mandibular first premolar has a mesiolingual developmental groove.
Does the mandibular second premolar have a mesiolingual groove?
No, the mandibular second premolar does not have a mesiolingual groove.
How does the crown of the mandibular first premolar tip
The crown of the mandibular first premolar tips lingually.
Which mandibular premolar has a buccal cusp centered over the root?
The mandibular first premolar has a buccal cusp centered over the root.
Describe the buccal triangular ridge of the mandibular first premolar
The buccal triangular ridge slopes at a 45-degree angle on the mandibular first premolar.
How does the marginal ridge of the mandibular first premolar relate to the triangular ridge?
The marginal ridge is nearly parallel to the buccal triangular ridge on the mandibular first premolar.
Which mandibular premolar shows a greater amount of occlusal surface?
The mandibular first premolar shows more occlusal surface than the second premolar.
Describe the mesial root depression on the mandibular first premolar.
The mandibular first premolar has a shallow root depression on the mesial surface.
Is there a root depression on the distal surface of the mandibular first premolar?
Yes, the distal surface of the mandibular first premolar has a less steep root depression.
What shape is the occlusal profile of the mandibular first premolar?
The mandibular first premolar has a diamond-shaped occlusal profile
How many cusps does the mandibular first premolar have?
The mandibular first premolar has two cusps.
How does the mandibular first premolar’s transverse ridge affect the fossae?
A distinct transverse ridge separates the mesial and distal fossae on the mandibular first premolar.
Which mandibular premolar is sometimes called “snake eyes” due to restorations?
Restorations on the mandibular first premolar may be called “snake eyes” due to the roundness of the mesial and distal fossae.
What are the two forms of the mandibular second premolar?
The mandibular second premolar can have a three-cusp or two-cusp form.
Which form of the mandibular second premolar is more common?
The three-cusp type is more common for the mandibular second premolar
Describe the cusps of the three-cusp mandibular second premolar.
The three-cusp mandibular second premolar has buccal, mesiolingual, and distolingual cusps.
Which cusp is wider and longer on the three-cusp mandibular second premolar?
The mesiolingual cusp is wider and longer than the distolingual cusp on the three-cusp mandibular second premolar
What groove separates the two lingual cusps on the three-cusp mandibular second premolar?
A developmental lingual groove separates the two lingual cusps on the three-cusp mandibular second premolar
Does the two-cusp mandibular second premolar have a lingual groove?
No, the two-cusp mandibular second premolar does not have a lingual groove
Which mandibular premolar’s occlusal table has a larger and more square profile?
The mandibular second premolar’s occlusal table has a larger, square profile, especially in the three-cusp type.
What groove pattern does the three-cusp mandibular second premolar typically display?
The three-cusp mandibular second premolar typically has a “Y” groove pattern
What is the central pit’s position on the three-cusp mandibular second premolar?
The central pit on the three-cusp mandibular second premolar is toward the distal side.
Describe the central groove on the two-cusp mandibular second premolar
The two-cusp mandibular second premolar’s central groove ends at mesial and distal fossae with an “H” or “U” groove shape
Which mandibular premolar has more supplemental grooves?
The mandibular second premolar has more supplemental grooves than the first premolar.
What happens if there is premature loss of a primary mandibular second molar?
The permanent mandibular first molar may incline and drift mesially, reducing space for the second premolar
Which mandibular premolar is least likely to have a depression on the mesial root surface?
The mandibular second premolar is least likely to have a mesial root depression
