Tooth morph

Question 1

what are the features of the primary maxillary second molar

Answer 1

• The primary maxillary second molar has characteristics resembling those of the permanent maxillary first molar but it is smaller
• Has a prominent transverse ridge (maxillary permanent first molar also has a transverse ridge)
• Has two buccal roots and one palatal root
• Has a more bulbous cusp on the mesial side
• The C shaped fissure is more mesial
• Distal fissure runs onto the distal side

Question 2

what are the features of the mandibular second molar

Answer 2

• The 3 buccal cusps are morphologically similar to the lower first permanent molar
• Smallest cusp is the distal cusp (buccal)
• Largest cusp is the mesial cusp (buccal)
• Has 2 roots – splayed due to the tooth germ underneath

Question 3

what are the features of the primary central incisors

Answer 3

• Root may bend towards the distal but it does not always
• Mesial edge of the crown tends to be straighter
• The upper is more bulbous than the lower as the lower tends to be more triangular, smaller and thinner
• The palatal of the upper incisors may have a cingulum
• General morphology seems to be similar to that of the permanent – may find that the primary ones are a bit more worn down

Question 4

what are the features of the primary canines

Answer 4

• Mesial edge tends to be straighter with the distal flaring out soon after the ACJ
• If the tooth are worn down, look at the cross section as in the cross section canines tend to be more diamond shaped than the incisors
• The lowers are slimmer

Question 5

what are the features of the primary maxillary first molar

Answer 5

• There is a prominent mesiobuccal tubercle – can be so prominent that it looks like another cusp
• The crown shape is a bit more square than the other molars
• The fissure pattern is slightly S shaped
• Has 3 roots – 2 buccal 1 palatal

Question 6

what are the features of the primary mandibular first molar

Answer 6

• Mesiobuccal tubercle

* More oval shaped