Primary vs. Permanent Dentition

What are the differences of primary enamel vs permanent?

Primary enamel is

-thinner (1 mm vs 2.5 mm)

-whiter

-less calcified

-More uniform in depth

-stops more abruptly at the CEJ

Which dentition's enamel is smoother with less pits and grooves?

primary

On primary teeth, the buccal and lingual surfaces are _______ above the height of contour?

flatter

What direction do enamel rods grow from the DEJ on primary teeth

occlusally [think kids are growing UP-reach upwards]

What direction do enamel rods grow from the DEJ on permanent teeth?

gingivally

Primary teeth have _____ cervical bulges than permanent teeth

larger

Which primary tooth has the largest cervical bulge?

primary mandibular 1st molar

What is specific about the CEJ of primary teeth?

More obvious/above gumline because the teeth have larger cervical bulges

The root trunk of primary teeth is ____ compared to permanent

shorter

Primary teeth have roots that are more flared/divergent and skinny. True or False?

True (think! They're skinny and flared because you have to have room for the developing permanent teeth underneath)

Primary teeth have proportionately _______ pulp cavities than permanent teeth

larger (think-primary teeth have larger pulp cavities b/c there hasnt been enough time for them to develop 2° and 3° dentin)

Primary teeth have a ______ DEJ than permanent teeth

thinner [because they haven't had time to accumulate 2° and 3° dentin]

Primary teeth have _______ pulp horns than permanent

more

The pulp horns of primary teeth extend ______ to the crown tip

closer

-the pulp horns are long & pointed

Where are the MANDIBULAR primate spaces located on primary teeth?

between the canine and 1st molar

Where are the MAXILLARY primate spaces located on primary teeth?

between the canine and lateral incisor

What is the only tooth in both dentition that has a mesiodistal diameter that is larger than the crown height?

maxillary central incisor

The primary maxillary central incisor is ______ mesiodistally and ______ incisocervically than the permanent

wider, shorter

The primary maxillary central incisor has prominent cervical ridges located where?

labially and lingually

On the primary maxillary canine, which cusp ridge is longer?

mesial

On the permanent maxillary canine, which cusp ridge is longer?

distal

Which permanent tooth has a mesial cusp ridge that is longer than the distal cusp ridge?

maxillary 1st premolar

Which canine, primary or permanent, has a longer and sharper cusp?

primary [think-it hasn't had time to wear down yet]

The crown of the primary maxillary 1st molar resembles the crown of which permanent tooth?

permanent maxilary 1st premolar

The roots of the primary maxillary 1st molar resembles the roots of which permanent tooth?

permanent maxillary 1st molar (3 roots)

Which half of the primary maxillary 1st molar is smallest?

distal (think of pedo typodont tooth)

Which primary tooth does not have a straight cervical line?

primary maxillary 1st molar

Where does the CEJ dip at on primary maxillary 1st molars?

mesial

How many roots does a primary maxillary 1st molar possess?

3

What shape does the occlusal/pit area of a primary maxillary 1st molar have?

H shaped

Which primary tooth crown resembles that of a permanent maxillary 1st molar?

primary maxillary 2nd molar

Which is the last primary tooth to erupt?

primary maxillary 2nd molar

Where are the cusps of carabelli located on primary teeth?

primary maxillary 2nd molars [remember, the crown resembles a permanent maxillary 1st molar!]

Which primary tooth is the most likely to have an oblique ridge?

primary maxillary 2nd molar [just like a permanent maxillary molar]

Which primary tooth has the greatest Faciolingual dimension of all primary teeth?

primary maxillary 2nd molar

Which primary tooth possesses a transverse ridge, oblique ridge, and a DL groove?

primary maxillary 2nd molar

[just like maxillary permanent molar]

Which primary tooth does not resemble any permanent tooth?

primary mandibular 1st molar

Which primary tooth has a transverse ridge that distinctly seperates the mesial portion from the rest of the occlusal table?

primary mandibular 1st molar

[remember, the permanent mandibular 1st molar has this too!-just doesnt look the same]

Which permanent tooth is most difficult to restore (class II) due to the prominent mesial marginal ridge?

primary mandibular 1st molar

How many cusps does a primary mandibular 1st molar have?

4

How many cusps does a permanent mandibular 1st molar have?

5

How many pulp horns does a primary mandibular 1st molar have?

4

Which cusp of a primary mandibular 1st molar if the highest and sharpest?

ML

[just like the permanent]

Where is the cervical ridge/bulge of a primary mandibular 1st molar located?

MB

-largest

where is the CEJ most apically positioned on the crown of a primary mandibular 1st molar?

mesial 1/3

Which primary tooth has an S shaped cervical ridge?

primary mandibular 1st molar [remember-it is tooth S!]

What permanent tooth does the primary mandibular 2nd molar most resemble?

permanent mandibular 1st molar

[same as with maxillary]

What is the easiest way to distinguish between a primary mandibular 2nd molar and a permanent mandibular 1st molar?

Compare the size of the distal cusps

-the distal cusp is relatively much larger in the primary

How many cusps does a primary mandibular 2nd molar possess?

5 [looks like a permanent mandibular 1st]