Maxillary 1st Molars (Ye's Version) Flashcards
From the buccal view, the crown outline of the maxillary 1st molar is roughly shaped:
Trapezoidal
From the buccal view, how many cusps are visible from the maxillary 1st molar?
4 major cusps
From the buccal view, the distal profile of the crown of maxillary 1st molar is?
Convex
From the buccal view, the mesial profile of the maxillary 1st molar is?
Convex and Flat
From the buccal view of the maxillary 1st molar, which cusp is larger?
MB
From the buccal view of the maxillary 1st molar, which cusp is smaller?
DB
From the buccal view of the maxillary 1st molar, which cusp is MORE pointed?
DB
The MB and DB cusps are separated by _________?
Buccal Developmental Groove
The mesial and distal contacts of the maxillary 1st molar (mesial distal HOC) are located in the ___________?
Middle 1/3
There is often a concavity present at the _______ area on the _______ surface of the _____ cusp
Cervical; distal; DB cusp
What are the issues with the concavity present on the cervical area on the distal surface of the DB cusp on maxillary 1st molars?
Can complicate restorations; difficult to remove calculus
From the buccal view of the maxillary 1st molar, how many roots are visible?
3 roots visible
From the buccal view of the maxillary 1st molar, which angle are the axes inclined?
Distally
What are the 3 specific roots from the BUCCAL view on maxillary 1st molars?
- MB
- DB
- Lingual/palatal
The MB root from the buccal view of the maxillary 1st molar is (straight/distal) then curves _______?
Straight; then distally
Where is the apex of the MB root from the buccal view of the maxillary 1st molar?
In line with MB cusp tip
The DB root from the buccal view of the maxillary 1st molar is (straight/distal) then curves _______?
Distal; then mesial
The lingual/palatal root on the buccal view of the maxillary 1st molar is the (shortest/longest) root?
Longest
The DB root on the buccal view of the maxillary 1st molar is the (shortest/longest) root?
Shortest
Where is the apex of the lingual/palatal root from the buccal view of the maxillary 1st molar?
In line with the buccal groove
The root trunk length from the buccal view of maxillary 1st molars?
1/3 length of root
What is the point of bifurcation is ___mm apical to the CEJ
4mm
Roots on the maxillary 1st molar are ______ as long as the crown
Twice
Are the roots on the maxillary 1st molar splayed or not?
Yes
The lingual, MB, and DB roots are splayed ________ than the crown width
Wider (Lingual/Palatal: 13mm > MB: 12mm > DB: 12mm)
How many canals on maxillary 1st molar
MB: 2 canals in 90-95% of cases
DB: 1 canal
Lingual: 1 canal
From the lingual, how many visible major cusps can you see on a Maxillary 1st Molar? Which cusps are they?
Two visible major cusps (ML, DL)
ML and DL separated by the _______ _______ on the maxillary 1st molar?
Lingual groove
Which cusp is spheroidal on the maxillary 1st molar when viewed from the Lingual?
DL cusp
The DL cusp on a maxillary 1st molar is what shape?
Spheroidal
The ML cusp = __/__ mesiodistal width of the tooth from the lingual view on the maxillary 1st molar?
ML is the most broad and the longest cusp on the maxillary 1st molar?
What is the 5th cusp on the maxillary 1st molar called?
Cusp of Carabelli
From the lingual, how many roots are visible?
3 roots
Which root is the longest on the maxillary 1st molar?
Lingual/palatal root
The lingual root is _____ ______ with the lingual groove (or buccal groove, or midpoint of MD dimension)?
In line
Where is the depression located on the lingual aspect of a maxillary 1st molar?
Lingual aspect (from the terminus of the lingual groove extending to the middle 1/3 of the root).
From the mesial, what is the outline form of the maxillary 1st molar?
Trapezoidal
From the mesial the tooth converges occlusally: maximum B-L width at the ______
Cervix
Only the ____ and ____ cusps are visible form the the mesial view of the maxillary 1st molar?
MB, and ML (and 5th minor cusp - cusp of carabelli)
The buccal HOC on the maxillary 1st molar (mesial view):
Cervical 1/3
The lingual HOC on the maxillary 1st molar (mesial view)
Middle 1/3
The mesial contact area on maxillary 1st molar (mesial view) is located in the ________? and is offset ______?
Middle 1/3; offset buccally
From the mesial, which roots are visible on maxillary 1st molars?
MB and Lingual/palatal
The MB root is _______ BL and hides the ______ root (mesial view)
broad; DB
Lingual root on maxillary 1st molar: ______ BL (banana shaped)
Narrow
What % of the times does the lingual root curve? What direction?
50%; buccally
What is the level of bifurcation ( __mm apical to CEJ) mesial view of maxillary 1st molar?
3mm
Maxillary 1st molar: Distal view
Crown constricts towards the _______, therefore the _______ aspect is visible from the distal.
distal; buccal
Maxillary 1st molar: Distal view
How many major cusps are visible?
4 major cusps
Maxillary 1st molar: Distal view
How many roots are visible?
3 roots
Maxillary 1st molar: Distal view
Bifurcation is about ___mm apical from the CEJ
5mm
Maxillary 1st molar: Distal view
Distal contact area is in the _______, and offset to the ______
Middle 1/3; offset to the buccal
Maxillary 1st molar: Distal view
There is a ____ concavity around the ______ area
DB concavity; cervical area
Maxillary 1st molar: Occlusal view
What is the outline form?
What angles are acute?
What angles are obtuse?
Rhomboidal
Acute = MB & DL
Obtuse = ML & DB
Maxillary 1st molar: Occlusal view
Crown wider _____ than _____
Wider BL than MD
Maxillary 1st molar: Occlusal view
The mesial aspect (greater or less) than distal aspect?
Greater
The maxillary 1st molar is the ONLY tooth which (broadens/shortens) toward the lingual?
Broadens
The MD width is (greater/less than) the L side than it is on the buccal?
Greater
Maxillary 1st molar: Occlusal view
Order the cusps: largest to smallest
(largest)
ML
MB
DB
DL
Fifth cusp (cusp of carabelli)
(smallest)
Maxillary 1st molar: Occlusal view
Which cusps form the primary molar triangle (trigon)?
ML, MB, and DB cusps
Maxillary 1st molar: Occlusal view
The oblique ridge is formed by the ______ cusp ridge of the ____ cusp and the triangular ride of the ____ cusp
Distal; ML; DB
Maxillary 1st molar: Occlusal view
How many major fossae are located here?
2 major fossae
Maxillary 1st molar: Occlusal view
What are the 2 fossae located here?
Central and Distal fossa
Maxillary 1st molar: Occlusal view
The central fossae lies where?
In the center of the trigon, mesial to the oblique ridge, roughly triangular
Maxillary 1st molar: Occlusal view
The distal fossae lies where?
Distal to the oblique ridge, roughly linear
Maxillary 1st molar: Occlusal view
How many minor fossae are there?
2 minor fossae:
- mesial triangular fossa
- distal triangular fossa
Maxillary 1st molar: Occlusal view
How many pits are there? What are their names?
2 pits:
- central pit
- distal pit
Maxillary 1st molar: Occlusal view
Where is the central pit located?
Junction of central developmental groove, buccal groove, transverse groove of oblique ridge
Maxillary 1st molar: Occlusal view
Where is the distal pit located?
Junction of distal oblique groove, lingual groove
The maxillary 1st molar has a __________. Meaning the root divides into ___ roots?
Trifucation; 3 roots
Maxillary 1st molar: Level of Furcations:
Mesial: __mm apical to CEJ
Buccal: __mm apical to CEJ
Distal: __mm apical to CEJ
Mesial: 3mm
Buccal: 4mm
Distal: 5mm
Maxillary 1st molar: Proximal contacts
Mesial: _____________ offset to ________
Distal: _____________ offset to ________
Mesial: middle 1/3 offset to buccal
Distal: middle 1/3 offset to buccal
What tooth & view?
Maxillary 1st molar - Buccal view
What tooth & view?
Maxillary 1st Molar - Lingual view
What tooth & view?
Maxillary 1st molar - Mesial view
What tooth & view?
Maxillary 1st molar - Distal view
What tooth & view?
Maxillary 1st molar - Occlusal view
What tooth & view?
Maxillary 1st molar - Buccal view
What tooth & view?
Maxillary 1st molar - Lingual view
What tooth & view?
Maxillary 1st molar - Mesial view
What tooth & view?
Maxillary 1st molar - Distal view
What tooth & view?
Maxillary 1st molar - Occlusal view