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power point -difference between primary and permanent teeth
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DIFFERENCE BETWEEN DECIDUOUS &
PERMANENT DENTITION
Difference between deciduous & permanent dentition
according to-
Anatomical
Histological
Clinical
DECIDUOUS PERMANENT
i). Total no. of teeth
20 32
ii). Dental formula DI 2 DC 1 DM 2 2 1 2
1 2 C 1 P 2 M 3 2 1 2 3
iii). Chronology of Maxillary Teeth
Eruption (In months)
Eruption (in years)
CI 10 (8-12) 7-8 Years LI 11 (9-13) 8-9 Years C 19 (16-22) 11-12 Years
1st Premolar - 10-11 Years2nd Premolar - 10-12 Years
1st Molar 16 (13-19) Boys
16 ( 14-19) Girls 6-7 Years
2nd Molar 29 ( 24-33) 12-13 Years 3rd Molar - 17-21 years
DECIDUOUS PERMANENT Chronology of Mandibular Teeth
Eruption (In months)
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.
Anatomical Difference between deciduous and permanent dentition
DECIDUOUS PERMANENT
Size Smaller Larger
Colour White in Colour (Because Less
Mineralized enamel So it is more opaque
and whiter
Less Whiter ( Because Highly
Mineralized enamel so it is yellowish)
Crown-root Ratio
Crown Shorter than root
Not so.
Cervical constriction
Present Absent
Enamel Thickness
Thinner Thicker
Mineralization Very Quickly attrited because they are less
mineralize
Less attrited because they are highly
mineralize
DECIDUOUS PERMANENT
Crown Dimension
Longer Mesiodistally than incisocervically
Longer Incisocervically than
mesiodistally
Developmental lines
Labial Surface of incisors are smooth
they don’t show any depression and
developmental lines
Labial Surface of incisors smooth and convex with to faint vertical development
lines & grooves
Cingulum More prominent Less Prominent
Mamelons Absent Incisal ridge consist of three prominent
mamelons
Anatomical Difference between anterior crowns of Deciduous & Permanent Dentition
DECIDUOUS PERMANENT Length of the
maxillary teeth Crown height Crown Height
CI 6.0mm 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
Length of the mandibular
teeth Crown height Crown Height
CI 5mm 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
Anatomical Difference between Posterior crowns of Deciduous & Permanent
Dentition
DECIDUOUS PERMANENT Cervical Bulge
Buccal & lingual surface are flatter about the cervical
bulge
More convex
Chewing Surface
Narrow Broad
Occlusal Surface
- Cusps are short - Ridges are not pronounced - Fossae are not deep
-Cusps are large & Sharp - Ridges are more Pronounced - Fossae are more deep
Mesial cervical ridge
Prominent Not Prominent
DECIDUOUS PERMANENT
Contact Areas
Broader, flatter & situated more gingivally
Narrower convex and situated more
occlusally
Size of Molars
2nd Molar Larger than 1st Molar
2nd Molar Smaller than 1st Molar
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 to crown size
-Wider mesiodistally
- Roots bend labially in their apical third to ½ by 100
Roots bend distally
DECIDUOUS PERMANENT
Posterior Root
- Longer & Slendar
- Roots are more flare to 1st molar
- Shorter Root
- Roots are less flared
Histological Difference betweenDeciduous & Permanent Dentition
DECIDUOUS PERMANENT Mineralization Less More
Enamel Thickness
Thinner Thicker
Surface Shape More Closely to the pulp chamber
Not So.
Pulp Size Larger Shorter
Pulp Horn Extends Closer to the Outer surface of
the Cusp
Not So.
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 more numerous
accessary canals
Not So.
DECIDUOUS PERMANENT
Reticular & Collagenous
Fibers
Present as a cap like zones
Not So
Apical foramen opening
Wider Narrower
Blood Supply
More Reduced ( Because of more
calcified nodules & ground substance
present )
Clinical Difference betweenDeciduous & Permanent Dentition
DECIDUOUS PERMANENT
Sensitivity to Pain
Less More
Response to
Infection & Inflammation
Typical Less
Localization of Infection
& Inflammation
Poor Better