Primary teeth

Question 1

The Max. primary central incisor is similar to the permanent counterpart, except for:

Answer 1

1. smooth labial surface, no mammelons
2. more prominent cingulum, with labial and lingual cervical bulges
3. height of crown is less than the mesiodistal width

Question 2

The Max. lateral incisor is similar to the permanent counterpart, except for:

Answer 2

1. smoother labial surface
2. more distinct lingual anatomy
3. facial and lingual cervical bulges

Question 3

The Max. primary canine is similar to the permanent counterpart, except for:

Answer 3

1. smooth, diamond shaped facial surface
2. height of crown is less than mesiodistal diameter
3. mesial and distal contact at the same level
4. mesial incisal slope is longer than the distal

Question 4

The Mand. primary central incisor is similar to the permanent counterpart, except for:

Answer 4

1. smoother labial surface
2. facial and lingual cervical bulges
3. more prominent cingulum
4. a developmental groove on the distal of root

Question 5

The Mand. primary lateral incisor is similar to the permanent counterpart, except for:

Answer 5

1. more prominent cingulum

2. facial and lingual cervical bulges

Question 6

The Mand. primary canine is similar to the permanent counterpart, except for:

Answer 6

1. smooth, arrow shaped labial surface

2. distal incisal ridge is longer than the mesial

Question 7

The Max. primary first molar is ….. . It features …… cusps

Answer 7

the most atypical of all molars

* two cusps, mesiobuccal & mesiolingual. May have a distobuccal cusp, and rarely, a small distolingual cusp

Question 8

The Max. primary first molar may have an extremely small cusp at …….

Answer 8

mesial ridge of the mesiobuccal cusp

Question 9

The Max. primary first molar occlusal profile is ……

Answer 9

trapezoidal, with mesial longer than distal, and buccal longer than lingual

Question 10

The Max. primary first molar occlusal table is ……, with a deep developmental groove separating …… . An occlusal ridge connects ……..

Answer 10

rectangular

• the buccal cusps (terminates in the central pit)
• mesiolingual cusp to the distobuccal cusp

Question 11

The Max. primary first molar heights of contour are ……….

Answer 11

low, with cervical bulges

* Note that: it has 3 divergent roots (elephant charging shape)

Question 12

The Max. primary second molar resembles the permanent first molar, except for:

Answer 12

1. more bulbous, with prominent cervical ridges

2. very little root trunk

Question 13

The Mand. primary first molar has ….. cusps. The transverse ridge connects the …….. cusps

Answer 13

4 cusps (2 buccal & 2 lingual, with the mesials being the largest)

• transverse ridge connects the mesial cusps
• Note that: the cusps are separated by a buccal groove & a lingual groove
• Looks more like a molar than the Max. first primary molar

Question 14

The Mand. primary first molar mesial profile is …….., while the distal is …….

Answer 14

straight

highly convex

Question 15

The Mand. primary first molar occlusal profile is ………, and the occlusal table is ….

Answer 15

trapezoidal (with mesial longer than distal, buccal longer than lingual)
* rhomboidal

Question 16

The Mand. primary first molar has a “pregnant appearance” due to ………
It has ……. roots

Answer 16

low, and prominent buccal cervical ridge (unique) under the mesiobuccal cusp
* two (with the mesial larger)

Question 17

The Mand. primary first molar has a central pit, from which …………… radiate
On the mesial ridge, it may have ………..

Answer 17

central groove (connect to buccal and lingual grooves)
mesial marginal groove

Question 18

The Mand. primary second molar resembles the permanent first molar, except for:

Answer 18

1. more divergent roots with no trunk
2. cervical bulges
3. the buccal three cusps are equal in size (in contrast to permanent distal cusp, which is smaller)
4. buccal cusps over the roots, while the lingual are outside the root outline

Question 19

The highest & sharpest cusp on the Mand. first molar is ………. , while the largest cusp on the same tooth is …….

Answer 19

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