Dentition

Question 0

What is a good way to determine if a tooth is permanent or deciduous?

Answer 0

Permanent teeth are colored yellow.

Question 1

What are the five surfaces of each tooth?

Answer 1

1) Labial/buccal: facing the cheeks or lips
2) Lingual: facing the tongue
3) Occlusal: top of tooth (biting surface)
4) Mesial: facing the median line
5) Distal: facing AWAY from the median line

Question 2

True or false: premolars are only deciduous

Answer 2

False- premolars are only adult teeth!

Question 3

What are the differences of deciduous molars from adult molars?

Answer 3

1) Smaller
2) Yellower
3) Thinner roots
4) Roots are wider apart
5) Have a marked wasting
6) Lower DM1 has a distinct morphology

Question 4

How do you identify incisors?

Answer 4

Characterized by a sharp single root with a sharp occlusal (mesiodistal) ridge.

Question 5

What are the features of an incisor?

Answer 5

1) A single root
2) A single crown with an occlusal (mesiodistal) edge
3) A shovel-shaped lingual surface

Question 6

What are features of a canine?

Answer 6

1) A single large root
2) A single pointed cusp
3) A large root in relation to its crown
4) The longest tooth in the mouth

Question 7

How do you identify a premolar?

Answer 7

1) Usually has two cusps; one buccal and one lingual

2) Usually smaller than a molar

Question 8

How do you differentiate an upper incisor from a lower incisor?

Answer 8

1) Large
2) Shovel-like crown
3) Cingulum

Question 9

How do you differentiate a lower incisor from an upper incisor?

Answer 9

1) Small
2) Narrow crown
3) NO cingulum

Question 10

How do you differentiate an upper canine from a lower canine?

Answer 10

1) Wider crown
2) Larger size
3) Sharper single-point cusp
4) Expanded cingulum

Question 11

How do you differentiate a lower canine from an upper canine?

Answer 11

1) Narrower crown
2) Smaller size
3) A blunt single-point cusp
4) Reduced cingulum

Question 12

How do you differentiate an upper premolar from a lower premolar?

Answer 12

1) Has cusps of equal size
2) Usually has 2 roots, one buccal and one lingual (like the cusps)
3) May have fused roots, but the line of fusion cannot be seen.

Question 13

How do you differentiate a lower premolar from an upper premolar?

Answer 13

1) A large buccal cusp
2) A single root, wider buccolingually and narrower mesiodistally
3) A root tip that sources dust ally when viewed from the lingual surface

Question 14

How do you differentiate an upper molar from a lower molar?

Answer 14

1) Has 3 roots that may be fused
2) Roots are arranged as: one lingual, one mesiobuccal, and one distobuccal
3) A more square crown
4) Usually 4 or 3 cusps

Question 15

How do you differentiate a lower molar from an upper molar?

Answer 15

1) Two roots that may be fused
2) Roots arranged as: one mesial and one distal
3) A crown that is more oblong
4) Usually 4 or 5 cusps

Question 16

How do you differentiate an upper central incisor from an upper lateral incisor?

Answer 16

1) Largest of the incisors
2) Has a square mesial angle of crown
3) Has a rounded distal angle of crown
4) Is most likely to have a shovel shape

Question 17

How do you differentiate an upper lateral incisor from an upper central incisor?

Answer 17

1) Smaller than an upper central incisor
2) Usually has a pit at the base of the cingulum
3) May have a shovel shape

Question 18

How do you differentiate a lower central incisor from a lower lateral incisor?

Answer 18

It is the smallest of the incisors

Question 19

How do you differentiate a lower lateral incisor from a lower central incisor?

Answer 19

1) Larger than a lower central incisor, but smaller than an upper
2) Has a wider crown (spreading out into a fan shape) at the occlusal surface

Question 20

How do you differentiate an upper PM3 vs PM4?

Answer 20

1) PM3 usually has 2 roots
2) Buccal cusp may be larger
3) Mesial surface of the crown is concave

Question 21

How do you differentiate an upper PM4 vs. a PM3?

Answer 21

1) PM4 usually has 1 root
2) Both cusps are about equal
3) The mesial surface of the crown is convex

Question 22

How do you differentiate a lower PM3 vs. a PM4?

Answer 22

1) Has a small, single, lingual cusp
2) May have a groove at the mesial surface of its root
3) May have a larger buccal cusp

Question 23

How do you differentiate a lower PM4 vs. a PM3?

Answer 23

1) Has a small, sometimes double lingual cusp
2) Has no groove at the mesial surface of its root
3) Has cusps of equal size

Question 24

How do you determine if an incisor is right or left?

Answer 24

1) The roots of the lower incisors are flattened in a plane that is perpendicular to the axis of the crown
2) The roots are wide labiolongually than mesiodistally
3) When held in anatomical position (by the root with the lingual surface facing you), there will be a groove on the flat surface of the root (distal surface) on the same side the tooth comes from

Question 25

How do you determine if a lower canine is right or left?

Answer 25

Held in proper position, there will be a groove on the flat surface of the root (distal surface) at the same side the tooth comes from

Question 26

How do you determine if an upper canine is right or left?

Answer 26

Held by the root with the crown facing down and the lingual surface facing you, there will be a groove on the flat surface of the root at the same side the tooth is from.

Question 27

How do you determine if an upper premolar is right or left?

Answer 27

When held by the root with the crown pointing down and lingual surface facing you, the tip of the root will incline toward the same side the tooth comes from.

Question 28

How do you determine if a lower premolar is right or left?

Answer 28

When held by the root with the lingual surface facing you, the tip will point in the direction of the side the tooth is from.

Question 29

How do you determine if an upper molar is right or left?

Answer 29

1) The distolingual cusp is the smallest
2) The crown is more convex on the lingual surface, and when held by the root with the crown pointing down with the distal (root) surface toward you, the convex side of the crown is at the side the tooth is from.

Question 30

How do you determine if a lower molar is right or left?

Answer 30

1) The roots are inclined toward the back
2) The crown is more convex on the buccal surface, and when held by the roots with the distal surface toward you, the convex side of the crown will be at the same side the tooth is from

Question 31

______ wear is usually greater than ______ wear.

Answer 31

BUCCAL wear is usually greater than LINGUAL wear.

Question 32

How do you identify the lower first molar?

Answer 32

1) 2 separate roots, mesial surface curved backwards

2) Usually has 5 cusps

Question 33

How do you identify the second lower molar?

Answer 33

1) 2 roots may be fused, both curved backwards

2) Usually 4 cusps

Question 34

How do you identify the lower third molar?

Answer 34

1) 2 fused roots that curve backwards

2) Variable number of cusps

Question 35

How do you identify the upper first molar?

Answer 35

1) Lingual root is largest an often widely divergent

2) Contact facets are found medically and distally

Question 36

How do you identify the upper second molar?

Answer 36

1) Lingual root is largest but not widely divergent

2) Contact facets are located medically and distally. When there is no M3, a distal facet is not present.

Question 37

How do you identify the third upper molar?

Answer 37

1) Roots often fused and smaller than in the first and second molars
2) Contact facets are in the mesial surface only