Maxillary 1st Premolars (Ye's Version)

Question 1

Maxillary right 1st premolar tooth #?

Answer 1

5

Question 2

Maxillary left 1st premolar tooth #?

Answer 2

12

Question 3

Maxillary 1st premolar: Chronological Events

First evidence of calcification:
Enamel completed (crown completed):
Eruption:
Root completion:

Answer 3

First evidence of calcification: 1.5-1.75 yrs
Enamel completed (crown completed): 5-6 yrs
Eruption: 10-11 yrs
Root completion: 12-13 yrs

Question 3

Maxillary 1st premolar: Lobe Development

Develops from how many lobes? How many facial/lingual lobes?

Answer 3

4 lobes: 3 facial, 1 lingual

Question 4

Maxillary 1st premolar:

What are the facial lobes?

Answer 4

3 lobes: MB, buccal/midbuccal, DB

Question 5

Maxillary 1st premolar:

The ________ lobe (which is well-developed and gives rise to the buccal cusp and to the prominent buccal ridge)

Answer 5

Buccal/mid buccal

Question 6

Maxillary 1st premolar:

The ________ lobe gives rise to the lingual cusp.

Answer 6

Lingual

Question 7

Maxillary 1st premolar:

Central development groove is the demarcation between the _______ lobe and the _______ lobes.

Answer 7

Lingual; buccal

Question 7

Maxillary 1st premolar:

Have _______ well-developed cusps. One _______ and one _______ cusp.

Answer 7

Buccal; lingual

Question 7

Maxillary 1st premolar:

The _______ cusp is referred to as the “functional cusp,” while the ______ cusp is referred to as the “non-functional cusp”

Answer 7

Lingual; buccal

Question 8

Maxillary 1st premolar:

These teeth are succedaneous teeth or non-succedaneous teeth? What does that mean?

Answer 8

They ARE succedaneous - replace deciduous maxillary molars

Question 9

Maxillary 1st premolar: BUCCAL view

Resembles a ________________

Answer 9

Maxillary canine

Question 11

Maxillary 1st premolar: BUCCAL view

Geometric outline form is roughly _____________

Answer 11

Trapezoidal

Question 11

Maxillary 1st premolar: BUCCAL view

MESIAL cusp arm (also called cusp ridge) of the buccal cusp is ________ and ________ than the distal cusp arm.

Answer 11

Longer; straighter

Question 12

Maxillary 1st premolar: BUCCAL view

DISTAL cusp arm is _______ and more ________

Answer 12

shorter; more curved

Question 13

Maxillary 1st premolar: BUCCAL view

The mesial cusp arm of the buccal cusp is also called the _______________ arm.

Answer 13

Mesio-buccal cusp arm

Question 14

Maxillary 1st premolar: BUCCAL view

The DISTAL cusp arm of the buccal arm is also called the ____________ arm.

Answer 14

Disto-buccal cusp arm

Question 15

Maxillary 1st premolar: BUCCAL view

The mesial contact area is located in the __________ cervicoocclusally.

Answer 15

Middle 1/3

Question 16

Maxillary 1st premolar: BUCCAL view

The distal contact is also in the middle 1/3, however, it is broader and located more _________ compared to the mesial contact.

Answer 16

Cervically

Question 17

Maxillary 1st premolar: BUCCAL view

There is a ______________ below the mesial contact

Answer 17

Mesial concavity

Question 18

Maxillary 1st premolar: BUCCAL view

The labial surface is generally _________ (concave/convex)?

Answer 18

Convex

Question 19

Maxillary 1st premolar: BUCCAL view

There is a prominent buccal ridge (develops from the buccal lobe) and associated developmental depressions (________ and ________ line angles respectively)

Answer 19

Mesial; Distal

Question 20

Maxillary 1st premolar: BUCCAL view

Which lobes are less developed and give rise to mesial and distal line angles respectively?

Answer 20

Mesial and distal lobes

Question 21

Maxillary 1st premolar: LINGUAL view Crown tapers __________ - the lingual part of the crown is _________ M-D compared to the buccal part

Answer 21

Lingually; narrower

Question 22

Maxillary 1st premolar: LINGUAL view The lingual cusp is ___mm shorter and (more/less) pointed than the buccal cusp?

Answer 22

1mm; MORE

Question 22

Maxillary 1st premolar: LINGUAL view The lingual surface is smoothly ________ (concave/convex)

Answer 22

Convex

Question 23

Maxillary 1st premolar: LINGUAL view The _______ cusp is more visible when viewing the tooth from the lingual aspect.

Answer 23

Buccal

Question 24

Maxillary 1st premolar: LINGUAL view The lingual cusp is located ________ to the long axis.

Answer 24

Mesially

Question 25

Maxillary 1st premolar: LINGUAL view The ___________ cusp arm is shorter than the distolingual (DL) cusp arm. OPPOSITE OF THE BUCCAL CUSP

Answer 25

ML

Question 26

Maxillary 1st premolar: MESIAL view The geometric outline is ___________ in shape

Answer 26

Trapezoidal

Question 27

Maxillary 1st premolar: MESIAL view How many cusps are visible? What cusps are they?

Answer 27

2 cusps; buccal and lingual

Question 28

Maxillary 1st premolar: MESIAL view The buccal cusp is ______ (shorter/taller) by ___mm cervicooclusally.

Answer 28

Taller; 1mm

Question 29

Maxillary 1st premolar: MESIAL view The cusp tips are located within the __________ of the root surface

Answer 29

Confines

Question 30

Maxillary 1st premolar: MESIAL view The buccal and height of contour (HOC) is located in the __________

Answer 30

Cervical 1/3

Question 31

Maxillary 1st premolar: MESIAL view The lingual height of contour (HOC) is located in the ___________.

Answer 31

Middle 1/3

Question 32

Maxillary 1st premolar: MESIAL view The buccal surface is not as _________ (concave/convex) as the lingual surface

Answer 32

Convex

Question 33

Maxillary 1st premolar: MESIAL view There is a ___________________ which crosses the mesial marginal ridge from the occlusal surface.

Answer 33

Mesial marginal ridge developmental DEPRESSION/CONCAVITY

Question 34

Maxillary 1st premolar: MESIAL view Do maxillary 2nd premolars have this developmental depression/concavity?

Answer 34

NO

Question 35

Maxillary 1st premolar: MESIAL view There is a _______________ which crosses the mesial marginal ridge from the occlusal surface.

Answer 35

Mesial marginal ridge developmental groove

Question 36

Maxillary 1st premolar: MESIAL view The mesial contact area is located in the ___________ of the tooth F-L but it offset to the _________.

Answer 36

Middle 1/3; offset to BUCCAL

Question 37

Maxillary 1st premolar: MESIAL view How many roots are visible? What are they? AND what % of the time are there this many?

Answer 37

2 roots; buccal and linugal; 50% of the time - there are 2 roots

Question 38

Maxillary 1st premolar: MESIAL view Even those with one root typically have ______ pulp canals, one buccal and one lingual.

Answer 38

2 pulp canals

Question 39

Maxillary 1st premolar: MESIAL view The root trunk takes up _________ of the length of the root.

Answer 39

1/2-2/3 length of root

Question 40

The __________ is the part of the root which extends from the CEJ to the point where the root divides.

Answer 40

Root trunk

Question 41

Maxillary 1st premolar: DISTAL view Differences between the distal and mesial aspect of the tooth: Absence of ____________ AND ____________

Answer 41

NO: 1. Mesial concavity/mesial developmental depression 2. Mesial marginal ridge developmental groove

Question 42

Maxillary 1st premolar: DISTAL view Differences between the distal and mesial aspect of the tooth: The curvature of the cervical line on distal is ______ (Less/More) than that on the mesial surface.

Answer 42

LESS

Question 43

Maxillary 1st premolar: DISTAL view Differences between the distal and mesial aspect of the tooth: The distal contact area is located in ________ and offsets to the _________ also.

Answer 43

Middle 1/3; offsets to buccal

Question 44

Maxillary 1st premolar: OCCLUSAL view __________ in outline

Answer 44

Hexagonal

Question 45

Maxillary 1st premolar: OCCLUSAL view The B-L dimension is _________ (lesser/greater) than the M-D dimension.

Answer 45

GREATER

Question 46

Maxillary 1st premolar: OCCLUSAL view The crown is wider on the _______ than the ________

Answer 46

Buccal than the Lingual

Question 47

Maxillary 1st premolar: OCCLUSAL view How many cusps are visible? Which ones are they?

Answer 47

2 cusps; 1 buccal and 1 lingual

Question 48

Maxillary 1st premolar: OCCLUSAL view How many ridges does each cusp have?

Answer 48

4 ridges

Question 49

Maxillary 1st premolar: OCCLUSAL view What are the 4 ridges in each cusp?

Answer 49

- Mesial cusp ridge (cusp arm) - Distal cusp ridge (cusp arm) - Buccal or lingual ridge (cusp arm) - Triangular ridge

Question 50

Maxillary 1st premolar: OCCLUSAL view The mesiobuccal (MB) cusp is _______ (shorter/longer) than the distobuccal (DB) cusp ridge?

Answer 50

Longer

Question 51

Maxillary 1st premolar: OCCLUSAL view The mesiolingual (ML) cusp ridge is _________ (shorter/longer) than the distolingual (DB) cusp ridge.

Answer 51

Shorter

Question 52

Maxillary 1st premolar: OCCLUSAL view Which is more prominent (Buccal or Lingual triangular ridge)?

Answer 52

Buccal triangular ridge

Question 53

Maxillary 1st premolar: OCCLUSAL view The ___________ and __________ marginal ridges are well developed.

Answer 53

Mesial and Distal

Question 54

Maxillary 1st premolar: OCCLUSAL view The mesiobuccal (MB) cusp ridge and the mesial marginal ridge form almost a ______ degree angle.

Answer 54

90 degree

Question 55

Maxillary 1st premolar: OCCLUSAL view The distobuccal (DB) cusp ridge and the distal marginal ridge form an _______ angle.

Answer 55

Acute

Question 56

Maxillary 1st premolar: OCCLUSAL view What things form an acute angle here?

Answer 56

DB cusp ridge and distal marginal ridge

Question 57

Maxillary 1st premolar: OCCLUSAL view What demarcations are seen here? (there are a lot)

Answer 57

- Central developmental groove - Mesial marginal ridge developmental groove - Mesiobuccal (MB) AND distobuccal (DB) supplemental developmental grooves -Mesial AND distal developmental pits. Where the mesiobuccal and the distobuccal supplemental grooves meet the central groove -Mesial AND distal triangular fossae

Question 58

Maxillary 1st premolar: Roots How many roots are there 50-60% of the time?

Answer 58

2 separate roots: 1 buccal and 1 lingual

Question 59

Maxillary 1st premolar: Roots When there are two roots, there is a _________

Answer 59

Bifurcation

Question 60

Maxillary 1st premolar: Roots Remember even when there is 1 root, there are usually _______ pulp canals.

Answer 60

Two

Question 61

Maxillary 1st premolar: Roots From the buccal, the root resembles the root of a _______ (what tooth?), besides the fact that it is 3-4 mm _______ (shorter/longer).

Answer 61

Canine; shorter

Question 62

Maxillary 1st premolar: Roots The root is broad _____ and narrow ______

Answer 62

BL- broad MD - narrow

Question 63

Maxillary 1st premolar: Roots The root has a _______ (long/short) root trunk. __________ (measurement) the length of the root.

Answer 63

Long; 1/2-2/3

Question 64

Maxillary 1st premolar: Roots There is a ______________ landmark located here.

Answer 64

Mesial marginal ridge developmental depression

Question 65

Maxillary 1st premolar: Pulp Morphology In a B-L section, how many pulp horns and pulp canals are there?

Answer 65

2 pulp horns; 2 pulp canals

Question 66

Maxillary 1st premolar: Pulp Morphology The buccal pulp horn is _______ (shorter/longer) than the lingual pulp horn.

Answer 66

Longer

Question 67

Maxillary 1st premolar: Pulp Morphology In a mesiodistal section, the root resembles the root of a ________.

Answer 67

Canine

Question 68

Maxillary 1st premolar: Pulp Morphology In a transverse cross section, the root is ________ shaped.

Answer 68

Kidney shaped