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NBDE Part 1 > Oral Anatomy: General > Flashcards

Oral Anatomy: General Flashcards

1
Q

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

A

True

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2
Q

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

A

distal; mesial

*Mandibular central is symmetrical

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3
Q

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

A

obtuse

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4
Q

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

A

distal; mesial

*mandibular centrals

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5
Q

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

A

True

*Max centrals are about equal

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6
Q

What is the most common bend in incisor roots?

A

Distal bend in apical third of root

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7
Q

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

A

False

Longer roots

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8
Q

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

A

Cervical third

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9
Q

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

A

True

Laterals have proportionally longer roots/smaller crowns

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10
Q

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

A

False

Distal (max laterals are centered)

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11
Q

T/F: Humans have a heterodont dentition.

A

True

Teeth have different morphology

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12
Q

T/F: Humans have a diphyodont dentition.

A

True

Two sets of teeth

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13
Q

What are lobes and what seperates the lobes of teeth?

A

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

Seperated by developmental depressions or grooves

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14
Q

How many mamelons are seen on incisors?

A

Three (one for each facial lobe)

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15
Q

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

A

True

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16
Q

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

A

tubercle

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17
Q

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

A

labial ridge (esp on maxillary canines)

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18
Q

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

A

buccal (cusp) ridge

esp on 1st premolars

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19
Q

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

A

All primary teeth and permanent molars

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20
Q

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

A

Runs from ML to DB cusps

Found on all maxillary molars

21
Q

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

A

True

22
Q

Which cusp has two triangular ridges?

A

The ML cusp of maxillary molars

23
Q

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

A

Transverse ridges

24
Q

Which teeth are least likely to be lost to carries?

A

Mandibular incisors

25
Q

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

A

Developmental groove

26
Q

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

A

fissure

27
Q

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

A

True

28
Q

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

A

False

Small irregularly shaped, do not separate major tooth parts

29
Q

T/F: All teeth have four point angles.

A

True

30
Q

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

A

6; 8

31
Q

Where is the largest occlusal embrasure?

A

Between max canine and PM1

32
Q

Which is the largest incisal embrasure?

A

Between max lateral and canine

33
Q

Which is the smallest incisal embrasure?

A

between mandibular centrals

34
Q

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

A

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

35
Q

All dental and periodontal arterial supply arises from the __________.

A

maxillary artery

36
Q

All dental and periodontal venous return drains to the _____________.

A

pterygoid plexus of veins

37
Q

The mesial contact is always more _________ than the distal.

A

Incisal

In general contacts are located more incisally from posterior to anterior

38
Q

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

A

True

Posterior contacts are slightly buccal

39
Q

The facial and lingual surfaces of all teeth are _________.

A

trapezoidal

40
Q

Which shapes make up the proximal surfaces of the teeth?

A

Anteriors: triangular
Max posterior: trapezoidal
Mand posterior: rhomboidal

41
Q

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

A

mandibular molars (junction of cervical and middle third)

42
Q

Where is the lingual HOC on anterior teeth?

A

Cervical third at the cingulum

43
Q

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

A

mandibular PM2 - occlusal third

44
Q

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

A

Anteriors

45
Q

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

A

greater

46
Q

Incisors and canines have _____ lobes.

A

four: 3 labial mamelons, 1 lingual cingulum

47
Q

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

A

Mand PM2 (3 buccal, 2 lingual)

48
Q

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

A

False

First molars have 5 lobes, seconds have 4 lobes

49
Q

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

A

False

Max is slightly longer

NBDE Part 1 (31 decks)

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