Primary Dentition

Compared to permanent counterpart, the deciduous teeth are...

smaller

whiter

less mineralized (more wear/abrasion)

Crown of deciduous vs permanent

shorter I-Gi

wider M-D proportionally than I-Gi

Compared to permanent counterparts, what do deciduous teeth have related to bulkiness?

cervical ridges on both facial and lingual of anteriors and buccal of posteriors

Where is a cervical ridge located on the anterior deciduous teeth?

facial AND lingual

Where is a cervical ridge located on the posterior deciduous teeth?

buccal

Where is the bulkiest part of the deciduous posterior teeth?

mesiobuccal

What is the CEJ of deciduous teeth like compared to their permanent counterparts?

more constriction at the CEJ

What is the dentin and enamel of deciduous teeth like compared to their permanent counterparts?

thin

What is the pulp of deciduous teeth like compared to their permanent counterparts?

the pulp is larger

What is the MB pulp horn of deciduous teeth like compared to their permanent counterparts?

taller than permanent teeth

Do permanent or primary teeth have more anomalies?

permanent

Do permanent or primary teeth have more variation in form?

permanent

Deciduous anterior teeth roots do what?

curve to the facial in the apical 1/3

What contact do deciduous teeth often lack?

proximal

Formula for primary dentition

I 2/2 + C 1/1 + M 2/2

This means there are 2 incisors per quadrant in maxillary and mand, 1 canine per quadrant in maxillary and mand, and 2 molars per quadrant in maxillary and mand

What is absent on the deciduous maxillary central incisor?

mamelons, developmental depressions, imbrication lines

What is the only deciduous anterior teeth that is wider M-D than I-Gi?

maxillary central incisor

Is the deciduous maxillary central incisor wider M-D or I-Gi?

M-D

What is the lingual like of the deciduous maxillary central incisor?

prominent cingulum, MR, and deeper fossa

Is the I-Gi or M-D larger of the deciduous maxillary lateral incisor?

I-Gi

*taller than it is wide

On the deciduous maxillary canine, the crown is wide _________________. It is almost as wide as it is long

M-D

What is the lingual like of the deciduous maxillary canine?

prominent cingulum, MR and deep fossa

Which half of the deciduous maxillary canine has greater bulk?

mesial

Is the cusp tip of the deciduous maxillary canine lingual or labial to the long axis?

labial

Is the mesial or distal proximal contact area of the deciduous maxillary canine more cervical?

mesial

What are the only teeth where the mesial contact area is more cervical than the distal contact area?

primary max. canine and mand. first premolar

Is the mesial or distal cusp slope longer on the primary max. canine?

mesial

What are the only teeth that have a longer mesial cusp slope than the distal cusp slope?

primary max. canine and permanent first premolar

The primary molars appear wider _______________ relative to ___________________ size than their permanent counterparts

M-D, B-L

What is the occlusal like of primary molars?

shallow occlusal anatomy

Where is a large cervical bulge seen on primary molars?

mesiobuccal

Primary molar roots are

long, thin, and more divergent

Is there a root trunk on primary molars?

little to no root trunk

The bulge on the mesiobuccal of primary molars leads to what on the facial?

an exaggerated cervical line

Primary second molars resemble what permanent tooth?

first molar

The primary maxillary 1st molar does not resemble any other tooth, but looks somewhat like...

maxillary premolars

Primary 1st molar cusp sizes largest to smallest

MB > ML > DB > DL

The primary maxillary 1st molar has what ridge?

oblique

The primary maxillary second molar resembles the permanent _______________ molar, with more taper to what side?

maxillary first, distal second

The primary mandibular central incisor looks similar to what permanent tooth?

mandibular lateral incisor

What is well defined on the primary mandibular central incisor?

cingulum

What is the fossa like on the primary mandibular central incisor?

shallow

On the primary lateral incisor, the MI angle is ______________ and the DI is __________________

acute, rounded

On what primary mandibular incisor is the cingulum offset to the distal?

lateral

Primary mand. lateral or central: MR are more defined

lateral

Primary mand. canine: is the distal or mesial slope longer?

distal

Primary mand. canine: the cusp tip is slightly _______________ to root axis

lingual

From the incisal view of the primary mand. canine, there is greater bulk on which side?

distal

Are the cingulum and ridges more prominent on the max or mand primary canine?

max

The primary mandibular 1st molar has what buccal cusps?

2 - MB>DB

Primary mand. 1st molar: where is the triangular ridge?

from MB to MLi

From the ____________ of the primary mand. 1st molar, most of the occlusal table is visible

distal

How many fossae are present on the primary mand. 1st molar?

3- mesial triangular, distal triangular, and central fossae

On the primary mand. 1st molar, which root is longer and wider?

mesial

The primary mand. 2nd molar is like the permanent ________________

first molar

The cervical line on the primary mand. 2nd molar is

almost flat

How many cusps are there on primary mand. 2nd molar?

5

From what view are all 5 cusps visible on the primary mand. 2nd molar?

distal

Pulps are relatively _______ in proportion to tooth than permanent pulps

larger

Molar pulp chambers are located mostly in _______________

crown

Gemination

"Twinning"; when a single tooth germ attempts to divide, resulting in the incomplete formation of two teeth

Gemination is more common in what dentition?

primary

If there is a gemination and you count it as one tooth...

you count the normal number

Fusion

involves dentin of two independently developed teeth fusing together

If there is a fusion and you count it as one tooth...

you count one less than the normal number