Morphology of primary teeth

1. By : Osama Ahmad .. Level 8 facebook.com/Os.a7mad ☚ [email protected]
Mandibular 1st molar

Mandibular
2nd

molar

Maxillary
2nd

molar


Maxillary 1sr molar




㊂ut line
Trapezoidal coronal

●Cusps
Four ML , MB , DB , DL
may three DL is missing

イPulp horns : Three or Four

MB = 0,8 mm DB = 1.3 - 2.1 mm
Lingual = 1.2 - 2.05 mm
below the cusp

MB horn is the largest➘
Roots ひ

Three slender Roots ,
[ two buccal one palatal ]
divergent then converge at
apices
In MB side there is
Well developed Molar tubercle = zukerkandl
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Groove >>
Central deep development groove between
buccal and lingual half and connect three fossas

Fossa >> Mesial , central , Distal




㊂ut line
Irregular quadrilateral

●Cusps
Four cusps ML , MB , DB , DL

イPulp horns : Four

ML , MB = 3.3 mm , below the cusp
DL , DB = 3.5 mm , below the cusp

Roots ひ
Two flat Roots

Long mesial root
Short distal root
In MB side there is
Well developed Molar tubercle = zukerkandl
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MD width lingually is less than buccally
Two mesial cusps joined by Transverse ridge

Fossa >>
small mesial Fossa , Longer distal fossa
㊂ut line : Rohomboid
replica of
permenant maxillary 1st molar
●Cusps
Four ML , MB , DL , DB
may fifth cusp : Carabelli
イPulp horns : Four or Five
MB = 4 mm , below the cusp
DB = 4.3 mm, below the cusp

MB horn is the largest➘

ひ Roots
Three Roots
Two buccal , one palatal
the largest is palatal

Ridge >>
from ML cusp to DB cusp oblique ridge

Groove >>
Ligual development groove
between B cusps , L cusps
2 Central pit 3 shallow mesial pit Pits 1 deep distal pit

㊂ut line : Regular Rectangular
replica of
permenant mandibular 1st molar
●Cusps : Five
3 Buccal cusps ,
2 Lingual cusps equal
イPulp horns : Five

MB = 4 mm , below the cusp
DB = 4.3 mm below the cusp

MB horn is the largest➘
ひ Roots :
Two widely divergent Roots

divergent flat in MD direction
Long mesial root contain 1 or 2 canals
Short distal root contain one canal

2 mesial pit 3 shallow distal pit Pits 1 deep central pit