Tooth Identification

Question 1

Maxillary Central Incisors

Answer 1

• wider mesiodistally than laterals
• mesioincisal angle 90’, distoincisal more rounded
• large distal offset cingulum
• crest of cervical line more distal from labial
• greatest CEJ curve
• shallow lingual fossa

Question 2

Maxillary Lateral Incisors

Answer 2

• lesser crown/root ratio
• smaller cingulum than central
• angles both more rounded
• same root length as central
• roots curve more distally
• most variation in anteriors, shape and size
• centred cingulum
• prominent lingual surface

Question 3

Maxillary Canine

Answer 3

• single cusp centred over root
• more prominent lingual ridge
• sharp cusp tip
• tearing tooth
• single rooted

Question 4

Maxillary 1st Premolar

Answer 4

• 2 major cusps - 1 lingual, 1 buccal
• similar size, buccal can be longer
• 2 roots
• well developed central groove
• ## mesial depression on enamel and root

Question 5

Maxillary 2nd Premolar

Answer 5

• 2 cusps approx same height
• 1 root
• shorter central groove
• no depressions
• lingual cusp closer to mesial
• root tilted distally
• increased supplemental grooves

Question 6

Maxillary 1st Molar

Answer 6

• largest crown in dentition
• 4 major cusps; 5 minor (carabeli/tubercle)
• strong oblique ridge
• 3 roots, palatal is largest
• well seperated roots, bend distally
• buccal groove at midline
• mesiolingual cusp longer than distolingual

Question 7

Maxillary 2nd Molar

Answer 7

• crown somewhat smaller than 1st
• usually 4 cusps, heart-like
• 3 roots, similar to 1st but less spread and straighter
• roots bend distally closer to apex
• buccal groove further distal
• mesiobuccal cusp longer
• smaller oblique ridge

Question 8

Maxillary 3rd Molar

Answer 8

• smaller crown and roots
• roots fuse; single or double tapering (3 roots)
• no oblique ridge
• small or no distolingual cusp
• more grooves on occlusal surface
• distobuccal cusp much shorter
• most variable form

Question 9

Mandibular Central Incisors

Answer 9

• smallest tooth in dentiton
• most symmetrical
• centred cingulum
• subtle lingual fossa/marginal ridges
• ## oval shaped root from distal view

Question 10

Mandibular Lateral Incisors

Answer 10

• often larger than centrals
• crown sloped mesial to distal; not bilaterally symmetrical
• twisted distally
• small displaced cingulum
• mesial longer than distal

Question 11

Mandibular Canine

Answer 11

• smoother lingual surface
• less defined fossa and marginal ridges
• narrower than maxillary
• less sharp cusp tip

Question 12

Mandibular 1st Premolar

Answer 12

• 2 cusps, smaller lingual
• occlusal surface tilted lingually
• more cervical curve on mesial
• distal marginal ridge more prominent
• no central pit
• mesial depressions

Question 13

Mandibular 2nd Premolar

Answer 13

• larger than 1st
• 2 or 3 cusps; Y groove
• increased supplemental grooves
• no transverse ridge
• more pentagon shaped
• central pit present

Question 14

Mandibular 1st Molar

Answer 14

• widest crown mesiodistally
• can have 5 cusps; pentagon shaped
• tapers buccal to lingual from occlusal
• zigzag central groove
• 2 buccal grooves
• distobuccal cusp is smallest
• 2 roots, curved

Question 15

Mandibular 2nd Molar

Answer 15

• 4 well developed cusps
• higher mesiobucccal cusp
• occlusal more defined
• forming X patterns with grooves
• 2 roots, longer and straighter than 1st
• straighter central groove

Question 16

Mandibular 3rd Molar

Answer 16

• vary greatly in shape and size
• 2 roots
• may be impacted (unerupted)
  wider buccalingually on mesial