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DIFFERENCE BETWEEN

DECIDUOUS & PERMANENTDENTITION

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Difference between deciduous& permanent dentition

according to-

Anatomical

Histological

Clinical

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DECIDUOUS PERMANENT

Chronology ofMandibular Teeth

Eruption (Inmonths)

Eruption (in years)

CI 8 (6-10) 6-7 Years

LI 13 (10-16) 7-8 Years

C 20 (17-23) 9-10

1st Premolar - 10-12 Years

2nd Premolar - 11-12 Years

1st Molar 16 (14-18) 6-7 Year

2nd Molar 27(23-31) Boys27 ( 24-30) Girls

11-13 years

3rd Molar - 17-21 Years.

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Anatomical Difference between deciduous

and permanent dentition

DECIDUOUS PERMANENT

Size Smaller Larger

Colour White in Colour(Because Less

Mineralized enamelSo it is more opaque

and whiter

Less Whiter( Because Highly

Mineralized enamel so itis yellowish)

Crown-root Ratio Crown Shorter thanroot

Not so.

Cervical

constriction

Present Absent

EnamelThickness

Thinner Thicker

Mineralization Very Quickly attritedbecause they are less

mineralize

Less attrited because theyare highly mineralize

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DECIDUOUS PERMANENT

CrownDimension

LongerMesiodistally thanincisocervically

LongerIncisocervically than

mesiodistally

Developmentallines

Labial Surface ofincisors are smooththey dont show any

depression anddevelopmental lines

Labial Surface ofincisors smooth andconvex with to faintvertical development

lines & grooves

Cingulum More prominent Less Prominent

Mamelons Absent Incisal ridge consist ofthree prominent

mamelons

Anatomical Difference between anterior crowns

of Deciduous & Permanent Dentition

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DECIDUOUS PERMANENTLength of the

maxillary teethCrown height Crown Height

CI6.0mm 10.5mm

LI5.6mm 9.00mm

C6.5mm 10.00mm

1st Premolar -- 8.5mm

2nd Premolar -- 8.5mm

1st Molar 5.1mm 7.5mm

2nd Molar 5.7 7mm

3rd Molar -- 6.5mm

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Length of themandibular

teeth

Crown height Crown Height

CI5mm 9mm

LI5.2 mm 9.5mm

C6mm 11mm

1st Premolar -- 8.5mm

2nd Premolar -- 8m

1st Molar 6mm 7.5mm

2nd Molar 5.5mm 7mm

3rd Molar -- 7mm

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Anatomical Difference between Posteriorcrowns of Deciduous & Permanent Dentition

DECIDUOUS PERMANENTCervicalBulge

Buccal & lingualsurface are flatterabout the cervical

bulge

More convex

ChewingSurface

Narrow Broad

OcclusalSurface

- Cusps are short- Ridges are not

pronounced- Fossae are not deep

-Cusps are large &Sharp

- Ridges are morePronounced

- Fossae are moredeep

Mesial

cervical ridge

Prominent Not Prominent

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DECIDUOUS PERMANENTContact

Areas

Broader, flatter &

situated more

gingivally

Narrower convex and

situated more

occlusally

Size ofMolars

2nd Molar Largerthan 1st Molar

2nd Molar Smaller than1st Molar

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Anatomical Difference between Roots of

Deciduous & Permanent Dentition

DECIDUOUS PERMANENT

Root

Formation

Root fully form about

one year after

eruption

Take a longer duration

of about 3 years

Root

Resorption

Physiological Pathological

Anterior Root -Narrower

mesioditaslly &longer compare tocrown size

-Wider mesiodistally

- Roots bend labiallyin their apical thirdto by 100

Roots bend distally

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DECIDUOUS PERMANENT

Posterior

Root

- Longer & Slendar

- Roots are more flareto 1st molar

- Shorter Root

- Roots are less flared

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Histological Difference betweenDeciduous & Permanent Dentition

DECIDUOUS PERMANENTMineralization Less More

Enamel

Thickness

Thinner Thicker

Surface Shape More Closely to thepulp chamber

Not So.

Pulp Size Larger Shorter

Pulp Horn Extends Closer to theOuter surface of the

Cusp

Not So.

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DECIDUOUS PERMANENT

Thickness of

Pulp Protective

Dentin

Less More

Number of

Accessory Canal

Increased Normal

Porosity Present Absent

Root Canal Ribbon Like &Multiple Pulp

Filaments with morenumerous accessary

canals

Not So.

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DECIDUOUS PERMANENT

Reticular &Collagenous

Fibers

Present as a cap likezones

Not So

Apicalforamen

opening

Wider Narrower

Blood Supply More Reduced (Because of morecalcified nodules &ground substance

present )

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Clinical Difference betweenDeciduous & Permanent Dentition

DECIDUOUS PERMANENT

Sensitivity to

Pain

Less More

Response to

Infection &

Inflammation

Typical Less

Localizationof Infection &Inflammation

Poor Better

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