Anatomy Ch.12

1st molars

the first permanent teeth to erupt

1st molars

Also called keystone teeth

molars

Largest & strongest teeth due to crown bulk size & root anchorage in bone

posterior

Towards which direction to molars converge to

distal

On molars which proximal area is narrower

5

1st maxillary molars are formed from _ lobes

major

On 1st maxillary molars, lobes 1 – 3 are:

cusp of carabelli

The 5th lobe of a maxillary molar is a nonfunctional supplemental tubercle called the

4

2nd & 3rd maxillary molars formed from_ lobes

grinding

Function of molars

maxillary 1st molars

Normally the largest teeth in MX arch

buccal

On which maxillary 1st molars surface can 4 cusp can be seen?

obtuse

On the maxillary 1st molars, the MB cusp forms an ____ angle

right

On the maxillary 1st molars, the DB cusp is closer to a _____ angle at cusp tip

buccal groove

divides the 2 B cusps, at terminal end you may find a B pit and supplemental grooves

furca

Where does the CEJ points towards on maxillary 1st molar buccal surface

straight, convex

On maxillary first molars:

M outline is _____

D outline is _____

mesiolingual

the largest cusp on maxillary 1st molars, cusp of Carabelli is found here

lingual

Which cusps are longer on a 1st maxillary molar

DL cusp of maxillary 1st molar

the smallest functional cusp

lingual groove

Divides the 2 lingual cusps

banana

On maxillary 1st molars,

L root is ______ shape from M view and curves buccally at the apical 1/3

distobuccal

the narrowest of the 3 roots on maxillary 1st molars

maxillary 1st molars

Occlusal outline is square or rhomboidal

maxillary 1st molars

Prominent oblique ridge (DB cusp & ML cusp) and DL groove are evident

central and distal fossa

3

How many roots do maxillary molars have

mesiobuccal

Which root on a maxillary 1st molar may have 2 canals orientated B/L

maxillary 1st molars

May have a root that has 2 canals

3,4

Typically, maxillary molars have _ pulp canals and _ pulp horns

4

On maxillary 1st molars, root trunk extends _mm from CEJ to M furca

4-5

On maxillary 1st molars, root trunk extends _mm from CEJ to D furca

maxillary 2nd molars

Usually see more supplemental grooves & pits

5th cusp is usually not present

maxillary 2nd molar

CEJ may points to furca or be flat (varies)

B groove may be present

maxillary 2nd molars

Crown shorter and roots closer together

Oblique ridge less prominent

maxillary 2nd molars

Occlusal outline is less rhomboid and more heart shaped

Roots are tapered closer together

3rd molars

No standard structural description

Most likely to have anomalies & variations

3rd molars

DL cusp poorly developed or absent

Have a tendency to be impacted or congenitally missing

3rd molars

Roots are very close together or fused

Extreme distal inclination of roots

mandibular molars

Have two roots, bifurcated, M & D roots

mandibular 1st molar

5 cusps are present

2 roots and 3 canals

mandibular 1st molars

Has a MB groove and DB groove

Cervical line dips apically toward bifurcation

3

On mandibular molars, the buccal root trunk is about _mm in length

mandibular 1st molar

L developmental groove separates cusps

L cusp are higher and more pointed than B cusp

3-4

On mandibular molars, the lingual root trunk is about _mm in length

mandibular 1st molar

On mesial surface, cervical line is higher on L compared to B by 1 mm

mandibular 1st molar

Occlusal outline is pentagonal

mandibular 2nd molar

4 cusps of equal size

mandibular 2nd molar

Occlusal outline is rectangular

mandibular molars

One pulp chamber, 3 canals, 2 roots

mandibular 3rd molars

irregular & unpredictable

Occlusal outline is more oval

Roots may be fused