Primary Dentition Flashcards
When does calcification begin
4-6months in utero
When does eruption begin
6-24 months
When does dentition fully erupt
By 2.5-3 years
When is root formation completed
1 year after eruption
When does root resorption begin
1 year after eruption
When are primary teeth replaced by permanent dentition
From 6-12 years old
Which primary tooth is larger than its successor
Mesio-distal width of deciduous molar>that of succeeding premolars
How does deciduous pulp chamber compare to permanent
Larger
Where do enamel rods in gingival 1/3 of primary dentition slope
occlusally rather than towards gingiva
What is the difference between #51 and #11
#51 Smaller and crown more bulbous #51 no mammelon #51 pulp tissue closer to surface
Where does apical 1/2 of root of #51 incline?
Labially to allow #11 to develop
How many pulp horns does #51 have
2 (mesial and distal)
Difference between #51 and #52 angles
Mesio-incisal angle more acute in #52
Disto-incisal angle more rounded in #52
How would you describe the shape of #53
Symmetrical crown with fang-like appearance, viewed labially/ palatally, crown appears diamond-shaped
Is #53 wider or longer
Wider
How many cusps does #54 have
2-4.
Buccal (more prominent) and palatal are the main cusps, but both can be divided into mesial (larger)
and distal
What can be observed on mesio-buccal aspect of #54 and #84
Tubercle of Zuckerkandl- large bulge of enamel towards cervical margin
How many roots does #54 have
3 divergent roots:
Palatal (round and largest)
Mesio-buccal (flattened mesiodistally)
Disto-buccal (Smallest, most curved)
How many pulp horns are there in #54
Well developed pulp horns to 2 main cusps, with additional pulp horns to additional cusps
How many cusps does #55 have
4: Mesiobuccal Distobuccal Mesiopalatal Distopalatal
What is a special feature of #55
Cusp of Carabelli at mesiopalatal
How many roots does #55 have
3 divergent roots: mesiobuccal, distobuccal and palatal
How many root canals and pulp horns does #81 have
1; 2 (mesial and distal pulp horn)
What shape does #82 have
Crown is assymetrical; fanshaped
Mesio-incisal angle is sharp and actue
Disto-incisal angle is rounded
Is the crown of #83 convex, concave or flat labially
convex
Is #83 symmetrical
Asymmetrical, with mesial slope shorter than distal slope
Is it true that the pulp and root canal are well defined in deciduous teeth
False
How many roots does #83 have
1, triangular in cross-section
How many fossa does #83 have lingually
It has two fossa, mesial and distal with a ridge connecting the cusp tip to the cingulum
How would you describe the shape of #84 on the occlusal surface
Elongated mesio-distally forming an irregular rectangle
How many cusps does #84 have
4;2 buccal and 2 lingual cusps, Mesial cusps larger than distal cusps
Does #84 have a transverse ridge
Yes, it has a transverse ridge from the mesio-buccal to mesio-lingual cusp resulting in a small mesial fossa and big distal fossa (due to larger size of mesial cusps)
How many roots does #84 have
2 divergent roots, mesial and distal both flattened mesio distally, mesial root is often grooved
How many root canals in mesial root of #84
2
Rank size of pulp horns in each cusp of #84
Largest MB (due to tubercle of Zuckerkandl)
ML (Mesial cusp larger)
DB
Smallest DL
Which permanent tooth is #85 most similar to
46; #85 is smaller and narrower with a more pronounced cervical ridge on the buccal surface
How many cusps does #85 have
5 (3 buccal and 2 lingual), one pulp horn per cusp
How many roots does #85 have
2 divergent roots, mesial and distal both flattened mesio distally
How many root canals does #85 have
3; 2 mesial and 1 distal
