Tooth Morphology

Question 1

Describe the features of the crown and root of a permanent maxillary right central incisor

Answer 1

• An acute angle on mesial crown
• A smooth curve on distal crown
• Convex cingulum
• Concave lingual fossa
• Oval/circular root

Question 2

Describe the features of the crown and root of a permanent mandibular right central incisor

Answer 2

• Obtuse angle from root apex to crown mesially
• Straight line from root apex to crown distally
• Slightly convex cingulum
• Slightly concave lingual fossa
• Flattened oval root

Question 3

Describe the features of the crown and root of a permanent maxillary right lateral incisor

Answer 3

• Acute angle mesially
• Smooth curve distally
• Convex cingulum
• Concave lingual fossa
• Oval to circular root

Question 4

Describe the features of the crown and root of a permanent mandibular right lateral incisor

Answer 4

• Crown and root in straight line mesially and distally
• Slightly convex cingulum
• Slightly concave lingual fossa
• Flattened oval root
• Crown rotated towards canine

Question 5

Describe the features of the crown and root of a permanent maxillary right canine

Answer 5

• Slightly convex mesially
• Markedly convex distally
• Mesial slope shorter than distal
• Convex cingulum
• Slightly concave fossa
• Wide buccal->lingual dimensions
• Oval/circular root

Question 6

Describe the features of the crown and root of a permanent mandibular right canine

Answer 6

• Crown and root in straight line mesially
• Markedly convex distally
• Mesial slope shorter than distal
• Slightly concave fossa
• Oval/circular root

Question 7

Describe the features of the crown and root of a permanent maxillary right first premolar

Answer 7

• Rectangular crown
• Two roots
• Developmental groove
• Canine fossa just above furcation
• Lingual cusp shorter than buccal cusp

Question 8

Describe the features of the crown and root of a permanent mandibular right first premolar

Answer 8

• Circular crown
• Mesiolingual developmental groove
• Lingual cusp very short compared to buccal
• Oval root

Question 9

Describe the features of the crown and root of a permanent maxillary right second premolar

Answer 9

• Rectangular crown
• Lingual cusp shorter than buccal
• Single root
• Tip of lingual cusp is more mesially inclined
• Long oval root

Question 10

Describe the features of the crown and root of a permanent mandibular right second premolar

Answer 10

• Circular crown
• Lingual cusp shorter than buccal
• Mesial marginal ridge is higher than distal marginal ridge
• Oval root

Question 11

Describe the features of the crown and root of a permanent maxillary right first molar

Answer 11

• Square crown
• Two buccal and one lingual root
• Four cusps, mesio-lingual lingual largest
• make sure you can identify the oblique ridge

Question 12

Describe the features of the crown and root of a permanent mandibular right first molar

Answer 12

• Rectangular crown
• One mesial and one distal root
• Three buccal and two lingual cusps
• Distal buccal cusps smallest

Question 13

Describe the features of the crown and root of a permanent maxillary right second molar

Answer 13

• Square crown
• Two buccal and one lingual root
• Four cusps, mesio-lingual largest
• Distal buccal cusp shortest

Question 14

Describe the features of the crown and root of a permanent mandibular right second molar

Answer 14

• Rectangular crown
• One mesial and one distal root
• Four equal cusps
• Mesial crown surface flattened
• Distal crown surface curved

Question 15

Describe the features of the crown and root of a permanent maxillary right third molar

Answer 15

• Irregular crown outline
• Three roots often fused
• Three cusps; if four, distoliwngual is smallest
• Distobuccal cusp shortest

Question 16

Describe the features of the crown and root of a permanent mandibular right third molar

Answer 16

• Rectangular crown
• One mesial and one distal root, often fused
• Four or more irregular cusps
• Flattened mesially
• Curved distally