maxillary 1st molar Flashcards
What is the largest and strongets tooth in the dental arch?
The first maxillary molar.
What is unique about the crown of the maxillary 1st molar?
Largest crown in permanent teeth.
How many well-developed cusps does the maxillary 1st molar have?
4
What additional (suplmental 5th) cusp does the maxillary 1st molar have on the mesial side?
The Cusp of Carabelli (a supplemental cusp).
Which cusp is particularly large on the maxillary 1st molar?
The mesiolingual (ML) cusp.
How does the width of the maxillary 1st molar compare mesiodistally and buccolingually?
It is wider buccolingually than mesiodistally.
What is notable about the root spread of the maxillary 1st molar?
It has the widest faciolingual (F/L) root spread in the mouth.
What is the widest root? (when viewed buccolingually)
mesiobuccal root
What shape is the occlusal view of the maxillary 1st molar?
Rhomboidal
What ridge connects the DB and ML cusps in the maxillary 1st molar?
The oblique ridge.
How many major cusps does the maxillary 1st molar have?
3 major cusps, forming a heart shape.
What types of angles are found on the occlusal surface of the maxillary 1st molar?
Obtuse and acute angles. (angled trapezoid)
How do the MB and DB cusps appear from the facial view of the maxillary 1st molar?
The MB cusp is rounder compared to the DB cusp.
What divides the two buccal cusps of the maxillary 1st molar?
The buccal developmental groove.
How does the cervical line appear on the facial view of the maxillary 1st molar?
It is irregular and curved, with the curve toward the apical 1/3.
What shape is the crown of the maxillary 1st molar from the facial view?
Trapezoidal
How does the mesial outline of the maxillary 1st molar appear from the facial view?
straight
Where is the mesial contact located on the maxillary 1st molar?
At the junction of the middle and occlusal 1/3.
When do the molars start to from?
At birth unless altered by system illness at birth
How does the distal outline of the maxillary 1st molar appear from the facial view?
has a marked convexity.
Where is the distal contact located on the maxillary 1st molar?
In the middle 1/3.
How does the DB cusp compare to the MB cusp?
The DB cusp is sharp, while the MB cusp is rounded.
How tall is the root trunk of the maxillary 1st molar?
4 mm tall. From the CEJ to the bifurcation
How many furcations do maxillary 1st molar have?
3 Furcations, On the mesial, distal, and buccal. Not lingual
What is important to note about the root form of the maxillary 1st molar?
The direction of curvature towards the distal
Which root is the largest in the maxillary 1st molar?
The palatal(lingual) root.
Which root is the second largest in the maxillary 1st molar?
The mesiobuccal root.
Which root is the smallest in the maxillary 1st molar?
The distobuccal root.
How do the lingual cusps compare to the facial cusps on the maxillary 1st molar?
The lingual cusps (ML and DL) are larger than the facial cusps.
What happens to the lingual groove on the maxillary 1st molar?
It extends onto the occlusal surface and becomes the disto-oblique developmental groove.
Is there a Mesio-lingual developmental groove present on the maxillary 1st molar?
Yes
What is the smallest cusp in bulk on the maxillary 1st molar?
The distolingual cusp.
How does the width of the lingual surface compare to the buccal surface on the maxillary 1st molar?
The lingual surface is wider than the buccal surface.
What is the tallest cusp on the maxillary 1st molar?
Mesial lingual cusp
What is clearly visible in the mesial view of the maxillary 1st molar?
The Cusp of Carabelli. (Mesial lingual cusp)
How does the cervical line appear on the mesial view of the maxillary 1st molar?
It is slightly convex towards the cusp tip.
Where is the buccal height of contour located on the maxillary 1st molar?
In the gingival 1/3.
Where is the lingual height of contour located on the maxillary 1st molar?
In the middle 1/3.
How does the CEJ appear on the mesial and distal view of the maxillary 1st molar?
Flat
How does the MB root appear in the mesial view?
broad faciolingually (F/L) and most often has 2 canals.
What is notable about the palatal/lingual root in the mesial view?
It may curve to the buccal in the apical third.
How far is the bifurcation from the CEJ?
3 mm from the CEJ.
How does the crown of the maxillary 1st molar appear from the distal view?
tapers toward the distal side.
How does the buccolingual measurement on the mesial side compare to the distal side?
crown is wider on the mesial side than on the distal side.
How does the cervical line appear on the distal view of the maxillary 1st molar?
straighter and less curved than on the mesial side.
How do the distal marginal ridge and mesial marginal ridge heights compare?
the mesial marginal ridge is more occlusal then the distal marginal ridge.
Are all the cusps visible from the distal view of the maxillary 1st molar?
Yes
How many roots are visible from the distal view of the maxillary 1st molar?
All three
How far is the bifurcation from the CEJ on the distal?
5 mm from the CEJ.
Where is the distal contact area located?
Middle 1/3
How does the distal side of the maxillary 1st molar appear?
convex, with a slight concavity on the distal surface of the root from the cervical line to the distobuccal root.
How does the distal marginal ridge compare to the mesial marginal ridge?
The distal marginal ridge is shorter and less prominent than the mesial.
What is more visible from the distal view of the maxillary 1st molar?
More of the occlusal surface
What is the primary cusp triangle of the maxillary 1st molar?
consists of the ML, MB, and DB cusps.
Is the DL cusp part of the primary cusp triangle?
No
Where is the Cusp of Carabelli located?
located on the lingual surface of the ML cusp.
Is the 5th Carabelli cusp functional?
No function
How does the size of the cusps rank on the maxillary 1st molar?
The size of the cusps from largest to smallest is: ML > MB > DB > DL > 5th.
Which is the largest (tallest and largest) cusp in the mouth?
Mesiolingual cusp
What roots are visible from the mesial proximal view of the maxillary 1st molar?
The MB and palatal roots are visible.
How do the roots project in relation to the crown in the proximal view of the maxillary 1st molar?
The roots project out past the confines of the crown.
How do the roots appear from the facial and lingual views of the maxillary 1st molar?
“pliered-handled”
How does the lingual root appear in the maxillary 1st molar?
The lingual root is very wide mesio-distally.
How do the roots align with the crown from the facial and lingual views?
The roots are within the confines of the crown from these views.
What are the functional cusps?
Lingual upper and buccal lower
What are functional cusps also known as?
Stamp cusps
What are the nonfunctional cusps?
Buccal upper and lingual lower (BULL)
Does the max 1st molar have a trifurcation?
Yes
Which tooth is wider lingually than buccally, resulting in a smaller lingual embrasure than facial embrasure?
Maxillary first molar.
What are the tooth numbers for the maxillary 1st molars?
3, #14
What is the largest to smallest furcation to CEJ measurement
5mm Distal
4mm Buccal
3mm Mesial
