primary dentition

Shorthand summary of teeth present Maxillary quadrant/mandibular quadrant Multiply by 2 for entire dentition

Human permanent dentition I 2/2 C 1/1 P 2/2 M 3/3

Human primary dentitionI 2/2 C 1/1 M 2/2

CatsI 3/3 C 1/1 P 3/2 M 1/1

DogsI 3/3 C 1/1 P 4/4 M 2/3

Universal system:

A to T Palmer: A to E by

quadrant FDI: 1st number

5– 8, second 1 to 5

Primary dentition period: only primary teeth are present, 6 months to 6 years

Mixed dentition period: the primary teeth are being replaced by the permanent teeth, 6 to 12 years

Permanent dentition period: after the last primary tooth has exfoliated

Primary

Mixed

Permanent

Mastication of solid foods Speech development Esthetics and self-esteem Space for eruption of permanent teeth Health of the permanent teeth

1st molars are first permanent teeth to erupt.

Referred to as

6 year molars They erupt distal to

primary dentition.

In general, mandibular teeth erupt before maxillary counterpart.

1st molars are first permanent teeth to erupt.

Central incisors are first SUCCEDANEOUS teeth to erupt.

Note the late eruption of the maxillary canine: may be impacted due to space loss.

Succedaneous teeth are permanent teeth that replace primary teeth.

AB D C E

A B D CE

Size: smaller in all dimensions. Color: lighter in color. Crowns: bulbous, wider mesiodistally,

shorter incisocervically CEJ: appears constricted Roots: longer and more slender

Primary teeth have:• thinner enamel & dentin• relatively larger

pulp cavitiesPulp horns are closer to outer

surfaceGreat variation in size &

locationForm of pulp follows external

anatomyUsually a pulp horn under each

cusp**Mesial pulp horn is higher

Short, bulbous crowns

Slender, flared roots Short root trunk Second molars >

first molars

GROUP 6:Celso, Anne R.

Flores, Joyce Anne G.Jung, Young MinParmar, Asma

Ramirez, Jan Andre P.

3 roots 1st resembles a

maxillary premolar

2nd resembles a permanent maxillary 1st molar

Mesial half of the crown has a greater height

DBR,MBR, and palatal root

Slender and long Spread widely

Distal root is shorter than Mesial root

Lingual root is positioned midway bet. the Bu roots

Bifurcation of the roots begins almost immediately at the Cervical line

Little root trunk

Almost similar to buccal aspect

MLC is prominent DLC is poorly

defined DBC visible

All roots visible Li root is larger MD Li surface is

entirely made up one cusp

Slightly convex occlusocervically, but markedly convex MD

MB, DB line angle are greater than ML,DL line angle

Mesial line angles are greater than Distal line angles

Crown converges lingually and distally

Occlusal surface is nearly rectangular

Has a center fossa and pit

Has BG and LG Has a Mesial

Triangular Fossa Mesial pit No distal pit Supplementary

groove in the mesial pit

Cervical width is much greater than occlusal due to a very promi- nent cervical ridge

Buccal outline is straight or slightly concave

Lingual outline is convex

ML cusp is longer and sharper than MB cusp

Cervical line is slightly curved toward occlusal

Marginal ride is shorter and less prominent

Smaller than mesial aspect

MR is less prominent

Db cusp is longer and sharper than DL cusp

Cervical line straight and slightly curved occlusally

Cervical ridge is not so prominent

Primary Maxillary Left First Molar

Tooth 54

MAX 1MAX 1stst Molar Molar MAX 2MAX 2ndnd Molar Molar

BUCCALBUCCAL -little evidence of -little evidence of dev’t groovesdev’t grooves

-looks like a -looks like a PREMOLARPREMOLAR

-roots are -roots are slender,long, spread slender,long, spread widelywidely

Distal root shorterDistal root shorter

-MBC DBC well -MBC DBC well defined, equal in sizedefined, equal in size

-roots are slender and -roots are slender and longer than MAX 1longer than MAX 1stst molarmolar

LingualLingual -MLC most prominent-MLC most prominent - MLC, DLC sometimes - MLC, DLC sometimes 55thth cusp is seen. cusp is seen.

ProximalProximal -DBC long and sharp-DBC long and sharp

-DLC poorly developed-DLC poorly developed-typical molar outline-typical molar outline

OcclusalOcclusal -Nearly RECTANGULAR-Nearly RECTANGULAR -RHOMBOIDAL-RHOMBOIDAL

MAXILLARY MOLARS

2 roots 2nd resembles the

mandibular 1st permanent molar

1st does not resemble any

other permanent or primary tooth!

Tooth 84

MAND 1MAND 1STST Molar Molar MAND 2MAND 2NDND Molar Molar

BuccalBuccal -2 Buccal cusps are 2 Buccal cusps are distinct but looks like distinct but looks like a fusion of two teetha fusion of two teeth

-similar to permanent -similar to permanent

11stst Molar Molar

-3 cusp portion almost -3 cusp portion almost equal in sizeequal in size

LingualLingual -MMR well dev’d might -MMR well dev’d might be mistaken for be mistaken for another cuspanother cusp

- Li cusps equal in - Li cusps equal in dimensiondimension

ProximalProximal -curvature of cervical -curvature of cervical line is distinctline is distinct

-flat and evenly -flat and evenly taperedtapered

OcclusalOcclusal -Rhomboidal-Rhomboidal -Rectangular-Rectangular

MANDIBULAR MOLARS

Primary teeth have Thinner enamel and dentin layers Pulp horns closer to the outer surface Mesial pulp horn much higher Relatively large pulps Enamel rods directed slightly occlusal in

cervical area More tortuous and irregular pulp canals