DA Compendium page 7 Flashcards
Which tooth has a unique developmental ML groove?
Mandibular 1st Premolar
What are the two varieties of the Mandibular 2nd Premolar?
a) 2-cusp: “U” or “H” occlusal groove pattern
b) 3-cusp: “Y” occlusal groove patter
Which of the varieties of the Mandibular 2nd Premolar is most common?
3-cusp –> Y occlusal groove pattern
Describe the contact areas on the Mandibular 1st Premolar
M contact area cervical to D contact area
Which teeth are the only permanent teeth where the lingual calibration measures greater than facial (i.e. the crown does not taper faciolingually)?
3-cusp mandibular 2nd premolar
Maxillary 1st Molar
Which tooth has an occlusal crown form that is said to be diamond shaped and why?
Mandibular 1st Premolar
- Because the FL - MD crown dimensions are closer than any other mandibular tooth
Which tooth has the smallest F-L crown dimension of any posterior tooth?
Mandibular 1st Premolar
Describe the distal contact areas of the Maxillary 1st molar and Maxillary 2nd molar
Maxillary 1st molar: Centered distal contact area
Maxillary 2nd molar: Centered distal contact area
T or F, All Mandibular molars have oblique ridges
False, All maxillary molars
How many cusps does the maxillary 2nd molar have?
4 primary cusps, rarely a 5th cusp
How many lobes does the 3-cusp Mandibular 2nd Premolar develop from?
5 lobes
Describe the L cusp on the mandibular 1st premolar
Small, non-functional and almost cingulum-like
Only 3 cusp Mandibular 2nd premolar has what specific features?
Central fossa
Lingual groove
Which Premolar is most likely to be congenitally missing?
3-cusp Mandibular 2nd premolar
Which cusp on the Maxillary 2nd molar is diminished in size
DL cusp size is diminished
What structures form the oblique ridge on all maxillary molars?
Distal cusp ridge of ML cusp
Triangular ridge of DF cusp
All maxillary molars have what a primary cusp triangle made up of what cusps?
MF, DF & ML
T or F, the sloped occlusal surface of Mandibular 1st premolar is visible from lingual aspect
True
How is the M marginal ridge positioned in the Mandibular 1st premolar vs its D marginal ridge?
M marginal ridge slopes lingually (45 degrees) and is cervical to D marginal ridge
3-cusp mandibular 2nd premolar has a L height of contour in what section of the crown?
Occlusal 1/3 of crown
