Differences between Primary and Perm teeth

1. NAVODAYA DENTAL COLLEGE
DEPARTMENT OF PEDODONTICS
STAFF NAME – Dr VINOD KUMAR
Professor and Head of department
TOPIC NAME –Difference between primary and permanent
teeth

2. Human beings has two sets of dentition(dyphodont), primary teeth acts as
space maintainers until eruption of permanent teeth

3. Primary teeth
 Eruption timings 6months -2 years
 20 in number
 Other names milk teeth baby teeth, temporary teeth, deciduous
teeth
 Primary teeth have thinner enamel making them appear a lot
whiter than permanent teeth.
 Develops directly from dental lamina
Permanent teeth
 6 yrs- 21 years
 32 in number
 Develops from lingual or distal extension of dental lamina
 Dark Greyish color

4. Primary teeth
Light in color
Shorter
Thin enamel and dentin
Narrow occlusal table
Constriction n cervical area
Broad contact points
Enamel rod in cervical area directed occlusally
M-D diameter of crown is more than cervico-
occlusal
Permanent teeth
Dark in color
bigger with thick enamel and dentin
Broad occlusal table
Not marked cervical constriction
Crowns

5. Primary teeth
 No developmental grooves in incisors
Perm teeth
 developmental grooves in incisors

8. Primary
 Large and slender in compare to crown
 Trunk small
 Width narrow mesio distally
 Resorption present during shedding
 short and bulbous in compare to crown
 Trunk large
 Width broad mesio distally
 Resorption not present unless infected
severly

9. Primary
 Large pulp chamber with prominent pulp
horn
 Root canals narrow like ribbon
 High cellularity and vascularity
Permanent
 small pulp chamber
 Root canals well defined with least branching
 low cellularity and vascularity

10. Primary teeth
 Enamel and dentin less mineralized
 More organic composition in enamel and dentin
 More prone to acid attack because of less
mineralization
 Neonatal lines are seen almost al teeth
Permanent teeth
 Enamel and dentin adequately mineralized
 Not More prone to acid attack because of less
mineralization
 Neonatal lines are seen in perm 1st molar