Permanent Incisors And Canines

Question 1

How many cusps do incisors have ?

Answer 1

None

Question 2

What is the geometry of an incisor from the labial surface ?

Answer 2

Trapezoidal shape

Question 3

What is the geometry of an incisor from the interstitial view ?

Answer 3

Triangular geometry

Question 4

What are the characteristics of the permanent maxillary first incisor ?

Answer 4

• single rooted
• shovel shaped
• wide incisol margin
• height of the root is equal to the height of the crown

Question 5

How can a permanent maxillary first incisor be sided ?

Answer 5

• the mesial surface of the root and crown is continuous
• the distal surface of the crown comes off at an angle

Question 6

How is the permanent maxillary second incisor different from the first ?

Answer 6

• not as wide
• more slender
• the root is longer than the crown
• a foramen caecum can be found behind the cingulum

Question 7

How are mandibular incisors different from maxillary incisors ?

Answer 7

• they are smaller
• they don’t tend to have cingulums

Question 8

What are the characteristics of the permanent mandibular first incisors ?

Answer 8

• very symmetrical
• root is flatter
• crown hangs over root slightly

Question 9

What are the characteristics of permanent mandibular second incisors ?

Answer 9

• fan shaped
• distal surface of crown is more angled so there is extra material

Question 10

How many cusps do canines have ?

Answer 10

One

Question 11

What is the labial geometry of canines ?

Answer 11

They have a trapezoidal shape

Question 12

What is the interstitial geometry of canines ?

Answer 12

They have a triangular geometry

Question 13

What are the characteristics of permanent maxillary canines ?

Answer 13

• quite large and stout
• single rooted
• crown is a lot shorter than the root
• cusp occupies 1/3rd of the crown height
• width and height of crown is equal

Question 14

How can the permanent maxillary canine be sided ?

Answer 14

• distal surface has a distinct bulge
• mesial slope is shorter than the distal slope

Question 15

What are the characteristics of permanent mandibular canines ?

Answer 15

• cusp occupies 1/8th of the crown height
• crown height is much greater than the width
• no distinct cingulum

Question 16

How are permanent mandibular canines sided ?

Answer 16

• mesial surface forms an edge with the labial surface
• distal surface more or less forms a curvature with the labial surface