Maxillary Molars Flashcards
Which max molar is the largest crown height and diameter?
1st molar
Crown height and MD crown diameter of maxillary molars ______ from 1st to third molars
decrease
How many lingual roots does the max 1st molar have?
1
Which root is the largest on the max 1st molar?
lingual root
How many buccal roots does 1st max molar have?
2
Which cusp is the largest cusp of the max molars?
Mesiolingual cusp
How many cusps does the 2nd and 3rd molars have?
4
How many cusps does the 1st molar have?
5
ML, MB and DB cusps form
trigon or primary cusp triangle
DL cusp is the smallest and _____ in size from 1st to 3rd molar
decreases
Which cusps make up the trigon on max molars?
ML, MB, and DB
Are the crowns on max molars broader M-D or F-L?
B-L
DB cusp is connected to the ML cusp of max molars by an _____
OBLIQUE RIDGE
What cusps of max molar are connected by oblique ridge?
DB and ML
Crown outline of max 1st molar from buccal view
trapezoidal
Distal profile from buccal is ___
Convex
Mesial profile from buccal is ___
Convex and flat
Which cusp is larger on max 1st molar: MB or DB?
MB
MB and DB cusps on 1st max molar separated by ______
Buccal Developmental Groove
Which cusp is more pointed on max 1st molar: MB and DB?
DB
Mesial and Distal contacts (mesial and distal heights of contour) of max 1st molar located in the
middle 1/3
Where is the concavity on 1st max molar that can complicate restoring the tooth and make it difficult to remove calculus?
cervical of DB cusp
(1st max molar root) straight, curves distally; apex in line with MB cusp tip
Mesiobuccal
(1st max molar root) the longest; in line with the buccal groove
Lingual/Palatal
(1st max molar root) the smallest;distal inclination, then mesial
Distobuccal
How many roots of 1st max molar ae visible from buccal view?
all 3
Roots of 1st max molar are _____ as long as crown
2x
Root trunk of 1st max molar is how much of the length of root from buccal?
1/3
Which root has 2 canals on 1st max molar?
MB
Which cusps are visible from the buccal view of 1st max molar?
All 4 major cusps
Which cusps are visible from lingual view of 1st max molar?
DL and ML (major) and cusp of carabelli
ML and DL cusps are separated by _____ which ends in the middle of the lingual surface
lingual groove
ML cusp of max 1st molar makes up how much of the total width of the tooth?
3/5
Which cusp of 1st max molar does the cusp of carabelli reside?
ML
How. many roots visible 1st max molar from lingula view?
3
T/F: 1st max molar Shallow depression on lingual aspect from the terminus of the lingual groove extending to the middle 1/3 of the root
True
Which cusps of 1st max molar are visible from mesial view?
ML, MB, and cusp of carabelli
Where is the max B-L width of max 1st molar?
cervix
Buccal height of contour of 1st max molar
cervical 1/3
lingual height of contour of 1st max molar
Middle 1/3
Mesial contact area of max 1st molar in the ______, and offset to the _______
middle 1/3; buccal
Which roots are visible from mesial aspect of max 1st molar?
Lingual and MB
Crown of max 1st molar constricts toward ____
distal
How many cusps of max 1st molar are visible from distal?
4 major cusps
How many roots of max 1st molar are visible from distal?
3
1st max molar Distal contact area is in the _____, and offset to the _____
middle 1/3; buccal
Occlusal outline of 1st max molar
rhomboidal
Which cusps of 1st max molar form acute angles?
MB and DL
Which cusps of 1st max molar form obtuse angles?
ML and DB
From the occlusal aspect of 1st max molar crown is ____ B-L than M-D
wider
MD width of 1st max molar is greater on the ____ side
lingual
What are the cusps sizes from largest to smallest on 1st max molar?
ML> MB > DB > DL > cusp of carabelli
How many major fossae does the 1st max molar have?
2
____ of 1st max molar lies in center of the trigon mesial to the oblique ridge, roughly triangular
Central fossa
_____ of 1st max molar lies distal to oblique ridge, roughly linear
Distal Fossa
How many minor fossae does the 1st max molar have?
2
____ of 1st max molar is at junction of Central Developmental Groove, Buccal Groove, Transverse groove of the oblique ridge
Central Pit
____ of 1st max molar is at junction of Distal oblique groove, Lingual groove
Distal Pit
root divides into three roots
Trifurcation
What are the levels of furcation of the 3 roots of 1st max molar from longest to shortest?
Distal, buccal, and mesial
What are the 2 occlusal shapes of the 2nd max molar?
Rhomboidal or heart shaped
Roots of 2nd molar are _____, and more ____ inclined compared to 1st Molar
as long or longer; distally
___ root apex is in line with buccal groove in 2nd max molar
MB
The apex of lingual root lines-up with ______ in 2nd max molar (vs. lingual groove in Maxillary 1st)
DL cusp tip
Roots are more splayed in which max omlar?
1st max molar
T/F: 2nd max molar roots don’t diverge as much and are confined with crown width
True
Contact area on distal and mesial of 2nd max molar is in _____ and offset to ___
middle 1/3; buccal
How many roots are visible from distal of 2nd max molar?
3
2nd max molar constricts toward ____ and converges toward _____
distal; lingual
If 2nd max molar is heart shaped, which cusp is absent?
DL
All roots of 2nd max molar exhibit ____ angulation
Distal
___ is the most variable tooth anatomy in the dentition
Max 3rd molar
Smaller M-D and cervico-occlusally, less developed than maxillary 2nd Molar, May resemble maxillary 1st or 2nd Molar, DL cusp poorly developed or absent, One lingual cusp usually, heart shaped occlusal, Roots are shorter and usually fused on the ______ max molar
3rd
When does Max 1st molar erupt?
6 yrs
When does Max 2nd molar erupt?
12
When does Max 3rd molar erupt?
17+
When does 1st max molar initiate calcification?
Birth
When does 2nd max molar initiate calcification?
2 1/2 yrs
When is 1st max molar crown completed?
3-4 yrs
When is 2nd max molar crown completed?
7-8 yrs
When are 1st max molar roots completed?
9-10 yrs
When are 2nd max molar roots completed?
14-16 yrs
