Oral Anatomy: General

Question 1

T/F: Incisors are all longer incisogingivally than mesiodistally.

Answer 1

True

Question 2

In most incisors, the crown outlines on the ______ are more convex than on the ______.

Answer 2

distal; mesial

*Mandibular central is symmetrical

Question 3

The distoincisal line angles are often more _______ than the mesioincisal line angles.

Answer 3

obtuse

Question 4

In most incisors, the _________ contact is in the incisal third, while the _______ contact is more cervical.

Answer 4

distal; mesial

*mandibular centrals

Question 5

T/F: Roots of most incisors are wider faciolingually than mesiodistally.

Answer 5

True

*Max centrals are about equal

Question 6

What is the most common bend in incisor roots?

Answer 6

Distal bend in apical third of root

Question 7

T/F: Crowns of incisors are often slightly longer than their roots.

Answer 7

False

Longer roots

Question 8

Where are the facial and lingual crests of curvature for incisors?

Answer 8

Cervical third

Question 9

T/F: The C:R ratio on max centrals is going to be closer to 1 than on laterals.

Answer 9

True

Laterals have proportionally longer roots/smaller crowns

Question 10

T/F: The cingula of max central incisors are off-center to the mesial.

Answer 10

False

Distal (max laterals are centered)

Question 11

T/F: Humans have a heterodont dentition.

Answer 11

True

Teeth have different morphology

Question 12

T/F: Humans have a diphyodont dentition.

Answer 12

True

Two sets of teeth

Question 13

What are lobes and what seperates the lobes of teeth?

Answer 13

Lobe = the primary center of enamel formation (cusps, mamelons, cingula)

Seperated by developmental depressions or grooves

Question 14

How many mamelons are seen on incisors?

Answer 14

Three (one for each facial lobe)

Question 15

T/F: The incisal edge of a canine is considered a cusp.

Answer 15

True

Question 16

A _________ is an extra formation of enamel on the crown of a tooth (ex. cusp of Carabelli)

Answer 16

tubercle

Question 17

The ___________ runs incisocervically in the center of the facial crown surface and is only found on canines.

Answer 17

labial ridge (esp on maxillary canines)

Question 18

The _____________ runs occlusocervically in the center of the buccal crown surface and is only found on premolars.

Answer 18

buccal (cusp) ridge

esp on 1st premolars

Question 19

Which teeth exhibit a cervical ridge that runs mesiodistally in the cervical third of the buccal surface of the crown?

Answer 19

All primary teeth and permanent molars

Question 20

Which way does the oblique ridge run and on which teeth is it found?

Answer 20

Runs from ML to DB cusps

Found on all maxillary molars

Question 21

T/F: There is a triangular ridge on all posterior teeth.

Answer 21

True

Question 22

Which cusp has two triangular ridges?

Answer 22

The ML cusp of maxillary molars

Question 23

_________ are most common on maxillary premolars and mandibular molars. They connect triangular ridges from buccal and lingual cusps.

Answer 23

Transverse ridges

Question 24

Which teeth are least likely to be lost to carries?

Answer 24

Mandibular incisors

Question 25

A ____________ is a well-defined, shallow, linear depression in enamel that separates cusps, lobes, and marginal ridges.

Answer 25

Developmental groove

Question 26

A __________ is a narrow crevice at the deepest portion of the developmental groove.

Answer 26

fissure

Question 27

T/F: Pits are found at the termination or junction of developmental grooves.

Answer 27

True

Question 28

T/F: Supplemental grooves are linear grooves that separate major tooth parts.

Answer 28

False Small irregularly shaped, do not separate major tooth parts

Question 29

T/F: All teeth have four point angles.

Answer 29

True

Question 30

Anterior teeth have ___ line angles. Posterior teeth have ____ line angles.

Answer 30

6; 8

Question 31

Where is the largest occlusal embrasure?

Answer 31

Between max canine and PM1

Question 32

Which is the largest incisal embrasure?

Answer 32

Between max lateral and canine

Question 33

Which is the smallest incisal embrasure?

Answer 33

between mandibular centrals

Question 34

Lingual embrasures are typically larger than buccal embrasures except in which teeth?

Answer 34

The buccal embrasures of the max M1 are larger than lingual embrasures

Question 35

All dental and periodontal arterial supply arises from the __________.

Answer 35

maxillary artery

Question 36

All dental and periodontal venous return drains to the _____________.

Answer 36

pterygoid plexus of veins

Question 37

The mesial contact is always more _________ than the distal.

Answer 37

Incisal In general contacts are located more incisally from posterior to anterior

Question 38

T/F: All contacts are located in the middle 1/3 from the occlusal view.

Answer 38

True Posterior contacts are slightly buccal

Question 39

The facial and lingual surfaces of all teeth are _________.

Answer 39

trapezoidal

Question 40

Which shapes make up the proximal surfaces of the teeth?

Answer 40

Anteriors: triangular Max posterior: trapezoidal Mand posterior: rhomboidal

Question 41

All facial HOC's are located in the cervical third, except __________.

Answer 41

mandibular molars (junction of cervical and middle third)

Question 42

Where is the lingual HOC on anterior teeth?

Answer 42

Cervical third at the cingulum

Question 43

Lingual HOC of posterior teeth are located in the middle third except __________.

Answer 43

mandibular PM2 - occlusal third

Question 44

Which teeth will have the maximum height of proximal CEJ contour?

Answer 44

Anteriors

Question 45

The mesial CEJ contour is always _______ than the distal contour.

Answer 45

greater

Question 46

Incisors and canines have _____ lobes.

Answer 46

four: 3 labial mamelons, 1 lingual cingulum

Question 47

Which is the only premolar that does not have four lobes (3 buccal, 1 lingual)?

Answer 47

Mand PM2 (3 buccal, 2 lingual)

Question 48

T/F: Second molars have more lobes than first molars.

Answer 48

False First molars have 5 lobes, seconds have 4 lobes

Question 49

T/F: The mandibular arch is slightly longer than the maxillary.

Answer 49

False Max is slightly longer