Clo 6

Question 1

Bifurcation definition:

Answer 1

Two roots

Question 2

Trifurcation definition:

Answer 2

Three roots

Question 3

Maxillary molars are ____furcated

Answer 3

Trifurcated

Question 4

Mandibular molars are ___furcated

Answer 4

Bifurcated

Question 5

What are cusps?

Answer 5

• Pointed peak located on the occlusal surface
• Found on molars, premolars and canines

Question 6

What are cingulums? Where are they found?

Answer 6

• single lobe on anterior teeth
• prominence of enamel found on the lingual cervical third

Question 7

How are lobes formed?

Answer 7

Teeth are developed in pieces. Become fused to firm the crown of the teeth. Each “piece” is a lobe

Question 8

General rule: facial of incisors, canines and premolars form from __ facial lobes. The lingual forms from one lobe to equal __ lobes.

Answer 8

a) 3
b) 4

Question 9

General rule: the molar ____ is a lobe- depends on number of _______ = lobes

Answer 9

a) cusp
b) cusps

Question 10

How many lobes on incisors?

Answer 10

3 lobes

Question 11

How many lobes on premolars?

Answer 11

4 lobes

Question 12

How many lobes on molars?

Answer 12

4-5 lobes

Question 13

How many lobes on 3rd molars?

Answer 13

No specific answer: many

Question 14

What are mamelons?

Answer 14

Rounded prominence on the in is al edge/ridge of newly erupted teeth
Formed => fusion of the three facial lobes

Question 15

What is a tubercle?

Answer 15

• A smaller elevation different from the cusp tip of a molar
• Occurs on facial, lingual and occlusal surfaces

Question 16

What is a ridge?

Answer 16

• A convexity (bulge) of enamel on the tooth
• surrounds all the cusps on posterior teeth or the edge of anterior teeth only on the lingual

Question 17

What is a marginal ridge?

Answer 17

• Rounded elevation of enamel forming the mesial and distal border of teeth
• anterior teeth marginal ridges are located on the lingual

Question 18

What is a triangular ridge?

Answer 18

• The ridges on teeth and cusp tips are convex
• the main triangular ridge runs from the cusp tip to the central part of the occlusal surface

Question 19

What is a transverse ridge?

Answer 19

• The union of two triangular ridges
• buccal to lingual over the occlusal surface of a posterior tooth
• buccal triangular ridge + lingual triangular ridge = transverse ridge

Question 20

Where are oblique ridges found?

Answer 20

Only on the maxillary molars

Question 21

What is a fossa?

Answer 21

A concavity (depression)

Question 22

Where is the lingual fossa located?

Answer 22

Is located between the marginal ridges and in is al ridge to the cingulum

Question 23

Central vs. Triangular fossa:

Answer 23

• Central fossa: deep angular valley in the central portion of the occlusal surfaces of molars
• triangular fossa: shallow pyramid shaped depression on the occlusal surfaces of the posterior teeth (located within the confines of the mesial and distal marginal ridges)

Question 24

What are grooves?

Answer 24

• tooth forms in lobes and fuse => groove demarcation in the occlusal surface

Question 25

Central development groove runs ______ and __________

Answer 25

a) mesial b) distal

Question 26

Buccal groove and lingual groove runs off the _________ _______

Answer 26

Central groove

Question 27

_______________ ________ grooves split off the central development groove and does not include secondary grooves

Answer 27

Triangular fossa

Question 28

Secondary (supplemental) grooves:

Answer 28

- not as well defined as developmental grooves - small irregular placed grooves on the occlusal surface - are NOT located at major junctions of the lobes

Question 29

What is a pit?

Answer 29

- pinhole - common area for caries to begin - named by location (buccal pit/lingual pit)

Question 30

What is a fissure?

Answer 30

- narrow cleft (crevice) at the depth of any groove - caused by fusion of the enamel during tooth development