Exam 1 Review

Question 1

The surfaces of teeth facing toward the adjoining or adjacent teeth in the same arch are called:

Answer 1

proximal surfaces

Question 2

The surfaces of teeth that are parallel to the long axis of the tooth are called:

Answer 2

axial surfaces

Question 3

What are the 4 axial surfaces of a tooth?

Answer 3

mesial
distal
facial
lingual

Question 4

In an oblique ridge there is a union of the ________ ridge of the _________ cusp and the _______ cusp ridge of the ___________ cusp across the facial-lingual perimeter on the occlusal surface

Answer 4

In an oblique ridge there is a union of the triangular ridge of the distofacial cusp and the distal cusp ridge of the mesiolingual cusp across the facial-lingual perimeter of the occlusal surface

Question 5

What is a valley or depression on the surface of a tooth between two ridges and or cusps of which the inclines meet at an angle?

Answer 5

sulcus

Question 6

T/F a sulcus is a groove

Answer 6

False - a sulcus is a depression or a space

Question 7

What is the last tooth to begin calcification? At what age?

Answer 7

Primary maxillary second molar (A&J) at 19 weeks in utero

Question 8

First evidence of calcification has occurred by what week in utero?

Answer 8

week 20

Question 9

What is the last primary tooth to exfoliate? At what age?

Answer 9

primary maxillary second molar at 11 years

Question 10

What permanent tooth replaces the primary maxillary second molar?

Answer 10

permanent maxillary second premolar

Question 11

What are the first permanent teeth to erupt? At what age?

Answer 11

1st molars at 6 years of age (#3, 14, 19, 30)

Question 12

What is the first permanent roots to completely form? At what age?

Answer 12

1st molars and central incisors at 9 years

Question 13

All permanent incisor tooth roots have completely formed by _____ years of age

Answer 13

11

Question 14

What anatomical structure is only on permanent mandibular molars and is considered an overdevelopment of either the distal cusp ridge of the mesiolingual cusp or the mesial cusp ridge of the distolingual cusp?

Answer 14

Tuberculum Intermedium

Question 15

Why is it important to have a curved plane of occlusion versus a flat plane?

Answer 15

Curved plane of occlusion permits maximum use of tooth contacts during function

A flat plane has too many contacts on most posterior teeth

Question 16

What is the only mandibular anterior teeth proximal contact area to be located in the middle third? (all others are at the incisal third)

Answer 16

distal of canine

Question 17

Where is the mandibular anterior proximal contact most incisal?

Answer 17

at the midline

Question 18

What is the height of contour of the following?
A. mandibular anterior teeth
B. mandibular first premolar
C. mandibular second premolar
D. mandibular molars
E. all facial surfaces of the mandibular arch

Answer 18

A. 0.5 mm at cervical third
B. 0.5 mm at middle third
C. 0.75 mm at middle third
D. 1 mm at middle third
E. 0.5 mm at cervical third

Question 19

What are the 8 types of periodontal fibers?

Answer 19

1. gingival
2. alveolar crest
3. horizontal
4. oblique
5. periapical
6. interradicular
7. transseptal
8. circumferential

Question 20

What periodontal fiber resists forceful impaction of a tooth into the alveolus?

Answer 20

oblique fibers

Question 21

What periodontal fibers help maintain contiguous proximal contact?

Answer 21

transseptal

Question 22

When is an embrasure created?

Answer 22

when two teeth in the same arch exhibit proximal contact with each other

Question 23

T/F an embrasure can exist in a patient with a diastema

Answer 23

True - between the proximal contact

Question 24

How many embrasures are there in an ideal embrasure construct?

Answer 24

4

Question 25

On permanent maxillary first molars are embrasures smaller on the facial or lingual side?

Answer 25

lingual are smaller than facial b/c crown tapers to the facial

Question 26

``` How do the following compare in primary vs. permanent molars: A. enamel B. dentin thickness C. pulp horns D. pulp chambers E. Enamel rod positioning ```

Answer 26

A. primary enamel thinner than permanent B. primary dentin thinner than permanent C. primary pulp horns are taller D. primary pulp chambers are larger E. primary enamel rods in cervical third are positioned occlusally, permanent are positioned apically

Question 27

On a primary maxillary lateral incisor where does the incisal ridge curve towards?

Answer 27

curves towards the facial surface

Question 28

What is the smallest cusp on a primary maxillary first molar from a lingual view?

Answer 28

distolingual cusp

Question 29

On a primary mandibular first molar which cusp is larger and taller: mesiofacial or distofacial?

Answer 29

mesiofacial cusp is larger

Question 30

On a primary mandibular first molar which root is longer and straighter: mesial or distal?

Answer 30

Mesial

Question 31

A primary mandibular second molar has what 2 distinct grooves?

Answer 31

mesial marginal ridge groove | central developmental groove

Question 32

T/F the distal marginal ridge has a notch instead of a groove that splits it into 2 segments

Answer 32

true

Question 33

Does a primary mandibular second molar have a transverse ridge?

Answer 33

no

Question 34

What is the most common location for a supernumerary tooth?

Answer 34

mandibular second premolar

Question 35

What tooth structure is shared in a tooth fusion?

Answer 35

dentin

Question 36

What teeth most commonly exhibit tooth fusion?

Answer 36

maxillary second and third molars

Question 37

Why is a permanent maxillary central incisor easily extracted?

Answer 37

the root is cone shaped with a blunt apex

Question 38

What is the crown length and width of the permanent maxillary lateral incisor as compared to the maxillary central incisor?

Answer 38

Length: 1.0 - 1.5 mm shorter than maxillary central incisor Width: 2.0 mm shorter than maxillary central incisor

Question 39

What is the shape of root apex on a permanent maxillary lateral incisor?

Answer 39

distally curved

Question 40

T/F the incisal ridge and root apex line up in a permanent maxillary lateral incisor

Answer 40

False - they are not in line with each other b/c of the apex of the root

Question 41

Permanent mandibular central incisal ridge is located where?

Answer 41

towards the lingual, over the crown and main body of the root

Question 42

Crown facial/lingual profiles

Answer 42

Enamel on the facial surface is slightly apical

Question 43

On a mandibular lateral incisor the incisal edge is _______ on the mesial but ________ towards the distal

Answer 43

straight on the mesial | slants towards the distal

Question 44

Which line angle on a mandibular lateral incisor is more sharp? more rounded?

Answer 44

More sharp: mesial | More rounded: distal

Question 45

On a mandibular lateral incisor what surface does the incisal ridge lean towards?

Answer 45

lingual surface

Question 46

On a permanent maxillary canine, where is the location of the cusp tip?

Answer 46

slightly mesial (could be in line)

Question 47

Which cusp ridge is longer on a permanent maxillary canine: mesial or distal?

Answer 47

distal is longer than mesial

Question 48

The root on a permanent maxillary canine has a slight ________ curvature or it could even be straight

Answer 48

distal

Question 49

On a permanent maxillary canine what is the cusp tip aligned with?

Answer 49

root tip and high of curvature cervical line

Question 50

Where is there a pronounced concavity on a permanent maxillary canine?

Answer 50

Distofacial cervical third

Question 51

On a permanent mandibular canine the cusp tip is _______ to the faciolingual bisector

Answer 51

lingual

Question 52

On a permanent maxillary first premolar which cusp tip is less pointed and shorter?

Answer 52

lingual is less pointed and 1.0 mm shorter than facial

Question 53

On a permanent maxillary first premolar which cusp tip is more mesial?

Answer 53

lingual

Question 54

Which cuspal ridge is shorter on a permanent maxillary first premolar?

Answer 54

mesial cuspal ridge is shorter than distal cuspal ridge

Question 55

The mesial marginal ridge is ________ to the faciolingual long axis bisector in a permanent maxillary first premolar

Answer 55

perpendicular

Question 56

What does the mesial marginal developmental groove divide?

Answer 56

divides the crest of the mesial marginal ridge into a facial and lingual segment

Question 57

The crest of the lingual segment lingually is ________ to the mesiodistal bisector of the crown in a permanent maxillary first premolar

Answer 57

mesial

Question 58

On a permanent maxillary first premolar the facial cusp tip is _______ to the mesiodistal bisector and _______ the distance from the facial outline to the faciolingual bisector of the crown

Answer 58

distal | 1/3

Question 59

On a lingual surface what tooth has lingual and facial cusps of about equal height/angulation?

Answer 59

permanent maxillary second premolar

Question 60

how many triangular fossae are on a permanent maxillary second premolar?

Answer 60

2 - mesial and distal (that are close to the center of the tooth)

Question 61

A permanent maxillary second premolar has a ________ central groove and _____ marginal ridges

Answer 61

short central groove | wide marginal ridges

Question 62

The lingual cusp on a permanent mandibular first premolar is ____ the height of the facial cusp

Answer 62

2/3

Question 63

The lingual cusp on a permanent mandibular first premolar can be described as what?

Answer 63

pointed and centered

Question 64

What is the angle to the crest of the mesial marginal ridge on a permanent mandibular first premolar?

Answer 64

45 degrees

Question 65

The central groove on a permanent mandibular first premolar is on the ______ portion of the crown

Answer 65

lingual

Question 66

Which groove on a permanent mandibular first premolar is linear in shape? What is it continuous with?

Answer 66

mesial groove | continuous with the mesiolingual groove

Question 67

What is the shape of the distal triangular fossa in a permanent mandibular first premolar?

Answer 67

comma shaped

Question 68

What side does the central groove on a permanent mandibular first premolar bend towards?

Answer 68

lingual

Question 69

What are the 3 cusps on a permanent mandibular second premolar and their measurements?

Answer 69

faciolingual mesiolingual: 1.5 mm shorter than facial distolingual: 2.0 mm shorter

Question 70

The lingual groove on a permanent mandibular second premolar is positioned to what side?

Answer 70

distally

Question 71

The developmental grooves on the permanent mandibular second premolar form what shape?

Answer 71

"Y" shaped

Question 72

T/F the three cusp variety on a permanent mandibular second premolar does have a transverse ridge

Answer 72

False - it does not have a transverse ridge