Quiz #3 Flashcards
Permanent Maxillary 3rd Molars: Occlusal Aspect
What are the 3 major pits?
What groove is not evident?
central, mesial triangular & distal triangular
lingual groove (no definite groove that separates the ML & DL cusps)
Permanent Maxillary 3rd Molars: Occlusal Aspect:
Arrange the 4 cusp sizes from largest to smallest (ML, MF, DL, DF)
From largest to smallest:
MF
ML
DF
DL
Permanent Maxillary 3rd Molars: Mesial Aspect
The crown to root ratio is approximately _____. (the root is only ______ the length of the crown, which is _______ (long or short) for molars)
1:2
twice
short
Permanent Maxillary 2nd Molars: Occlusal Aspect
Arrange the 4 cusp sizes from largest to smallest (ML, MF, DL, DF)
From largest to smallest:
ML
MF
DF
DL
Permanent Maxillary 2nd Molars: Occlusal Aspect
The occlusal structure has _____ well-developed cusps.
The _____ cusp is the most facially and mesial placed cusp.
4
MF (“this is all about mesiofacial cusp placement”)
Permanent Maxillary 2nd Molars: Mesial Aspect
A porion of _____ of the 4 cusps tips can be seen from this view. They are:
The facial & lingual outlines of the crown are both _______.
The mesial marginal ridge outline displays a ______ curvature and is deviod of a ______.
3
convex
semicircular; groove
Permanent Maxillary 2nd Molars: Lingual Aspect
The mesial cuspal ridge of the ML cusp meets the straight mesial outline of the crown at a _____ degree angle.
The DL cusp is well developed & takes up the remaining ____ % of the total mesiodistal width of the crown.
115 (defnitely not 90 degrees!!!)
35
Permanent Maxillary 2nd Molars: Facial Aspect
The facial groove is ____ and more _______ positioined, especially in comparison with the maxillary M1.
The MF cusp is ______ than the DF cusp.
The cervical line is ______ across rom mesial to distal, except for an apical dip in the ________ area of the crown.
short; distally (FYI, there is only 1 facial groove)
wider
straight; midpoint
Permanent Maxillary 1st Molars: Occlusal Aspect
There are two major fossae located on either side of the mid-point of the oblique ridge. They are the _____ fossa which is the center of the occlusal surface and the _____ fossa on the distal side of the oblique ridge.
central
distal
Permanent Maxillary 1st Molars: Occlusal Aspect
Arrange the 5 cusp sizes from largest to smallest (ML, MF, DL, DF, 5th)
largest to smallest:
ML
MF
DL
DF
5th (Carabelli’s)
*Note: the maxillary M1 is known for having a well-developed disolingual cusp*
Permanent Maxillary 1st Molars: Distal Aspect
There is a ______, but consistent root surface depression that extends from the cervical 3rd of the root across the _______ _______ onto the cervical 3rd of the crown.
shallow
cervical line
Permanent Maxillary 1st Molars: Distal Aspect
Like all molars, the crown is ________ in its distal half.
Most of this distal convergence takes place because the _______ cervical ridge flattens out in the distal half.
Therefore, it is possible to see much of the ______ surface when viewing the tooth from the distal aspect.
narrower
facial
facial
Permanent Maxillary 1st Molars: Mesial Aspect
The facial outline of the MF root often extends _______ in it’s middle 3rd almost beyond the _________ __________ of the crown.
The root then curves ______ to a relatively ______ apex that is _____ (in or out of) line with the tip of the MF cusp.
facially; greatest projection
lingually; blunt; in
Permanent Maxillary 1st Molars: Mesial Aspect
How many roots are visible? Which root is not shown? Which is wider faciolingually & slightly longer?
2 ( of 3)
DF is not visible.
The MF root is wider & slightly longer than the DF so it is superimposed over it.
Permanent Maxillary 1st Molars: Mesial Aspect
The triangular ridges of the MF & ML cusps are not as ______ as on the maxillary premolars.
There is a ______ marginal groove that crosses the mesial marginal ridge & travels slightly onto the mesial surface and is lined up with the _______ long axis.
inclined
mesial
vertical
Permanent Maxillary 1st Molars: Lingual Aspect
The lingual groove begins at the ______ border of the ______ table as an extension of the distal oblique groove.
The lingual groove separates what 2 cusps?
As the lingual groove slants diagonally across the lingual surface, it reaches a position near the ______ of the MD width and turns more ______ with the long axis.
lingual; occlusal
ML & DL
center; parallel
Permanent Maxillary 1st Molars: Lingual Aspect
The DL cusp is ____ developed & takes up _____% of the total MD width of crown.
The DL cusp tip is so rounded that is is described as ________.
The occlusal outline of the DL cusp joins the distal outline of the crown in an arc that is almost that of a __________.
well; 40
spheroidal
semicircular
Permanent Maxillary 1st Molars: Facial Aspect
The MF root extends apically with a slight ______ curve for 2/3rds of it’s length. It then curves slightly to the _______.
The DF root is ______ & _______ than the MF root.
The root trunk averages ____ mm in length
mesial; distal
straighter; shorter
4
Permanent Maxillary 1st Molars: Facial Aspect
The facial surface has a slight _______ extending laterally (both mesially & distally) from the ______ limit of the facial groove.
The facial surface has ______ facial ridges (extending cervically from the cusp tip of each facial cusp) that terminate in the ________ third.
The cervical ridge runs mesiodistally just _______ to the cervical line but only in the mesial 2/3rds of the cervical 1/3rd.
depression; cervical
vertical; cervical
occlusal
Permanent Maxillary 1st Molars: Facial Aspect
Both facial cusps are more ______ than the lingual cusps.
The cuspal ridges of the MF cusp meet at an _______ angle.
The cuspal ridges of the DL cusp meet at a ____ degree angle, making it sharper than the MF cusp tip.
pointed
obtuse
90
Permanent Maxillary 1st Molars: Facial Aspect
The facial groove extends ________ between the MF & DF cusps to a point near the ______ of the facial surface, with a slight ________ at the facial pit location toward the distal.
occlusocervically
center
angulation
Which tooth is described from the distal aspect?
There is a shallow but consistent root surface depression that extends from the cervical third of the root across the cervical line onto the cervical third of the crown. Because this distal depression is consistently seen on maxillary first molars clinicians must be careful to restore class 2 restorations on this surface or be mindful of calculus deposits that may engulf the depression, making the calculus difficult to remove.
Permanent Maxillary First Molar
