Difference Bw D P Dentition

8/6/2019 Difference Bw D P Dentition

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DIFFERNCES BETWEEN DECIDUOUS

AND PERMANENT TEETH


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DIFFERENCES OF THE CROWN

Primary Teeth Permanent Teeth

Lighter in colour, bluish

white/ milk teeth (R.I. is

same as milk i.e. 1)

Darker in colour, grayish or

yellowish white.

Duration: 6 months to

5-6 years

Duration: 6 years onwards

Number: 20 Number: 32

Smaller in dimension Larger in dimension


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Crowns are wider

mesiodistally.

Crowns are wider cervico

incisally

Cervical ridges are

prominent especially onbuccal aspect

Cervical ridges are less

prominent

Narrow occlusal tables Less convergence of

buccal and lingual surfaces

Sharp cervical constriction Less constriction of the

neck


6/17


Enamel is thinner anduniformly thick(1mm).

Enamel is about 2-3 mmthick.

Contact areas are broader

and flatter and gingival.

Contact points are more

occlusally situated.Enamel rods at the cervical

slopes occlusally from DEJ

Enamel rods are oriented

gingivally

Supplemental grooves are

more

Supplemental grooves are

less


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Mammelons absent Mammelons are present

on newly erupted teeth

First molar is smaller in

dimension than second

molar

First molar is larger in

dimension than second

molar


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DIFFERENCES OF THE ROOT AND PULP


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DIFFERENCES OF THE ROOT

The roots are larger and

slender compared to crown

size

Roots are more bulbous

and shorter in comparison

to crown

Root trunk is smaller Root trunk is larger

Roots flare outward to

accommodate permanentteeth

Marked flaring is absent

Physiologic resorption

during shedding

Physiologic resorption is

absent


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DIFFERENCES IN THE PULP

Pulp chamber is larger in

relation to crown size

Pulp chamber is smaller in

relation to crown size

Pulp horns are moreprominent and are closer to

the outer surface

Pulp horns arecomparatively away from

the outer surface

High degree of cellularity

and vascularity in tissue

Comparatively less degree

of cellularity and vascularity


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DIFFERENCES IN THE PULP

High potential for repair Less potential for repair

Greater thickness of dentin

over the pulpal wall at theocclusal fossa of molars

Comparitively lesser dentin

on the occlusal surface

Root canals are ribbon like.

Radicular pulp is thin,

tortuous and branch.

Root canals are well

defined with less

branching.

Floor of pulp chamber is

porous. Accessory canals

are present in good number

Floor of pulp chamber does

not have any accessory

canals.


12/17

HISTOLOGICAL DIFFERENCES

Enlarged apical foramen

Abundant blood supply

demonstrates typical

inflammatory response

Foramens are restricted

Reduced blood supply

favours calcific response

Reparative dentin formationis more extensive and

irregular

Reparative dentin formationis less

Density of innervation is

less of which primary teethare less sensitive

Density of innervation is

more

Localisation of infection

and inflammation is poorer

in pulp

Inflammation and infection

in pulp is localised.


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MINERAL CONTENT

Enamel and dentin are less

mineralized

Enamel and dentin are

highly mineralized

Neonatal lines are present Neonatal lines seen only infirst molar

Dentinal tubules are less

regular

Dentinal tubules are more

regular

Dentin is less dense. It cuts

more easily

Dentin is difficult to cut as it

more dense.


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PERIODONTAL DIFFERENCES

Cementum is very thin.

Secondary cementum isabsent

The secondary cementum

is present

Alveolar atrophy is rare Alveolar atrophy occurs

Gingivitis is generally

absent in healthy child

Gingivitis is common in

adult.


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CLINICAL IMPLICATIONS

Cavity cutting

Root canal treatment.


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Doubts??


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Difference Bw D P Dentition

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