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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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