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What is derived from mesoderm?

dentin, pulp, cementum, peridontal ligament, some aveolar bone

Enamel organ

enamel-derived from Ectoderm

Dental papilla

mesoderm cells which form the dentin and pulp

Dental Sac

mesoderm cells which forms cementum, periodontal ligament, and alveolar bone

Dental lamina

-1st sign of tooth formation
-stratified squamous epithelium thickens into underlying connective tissue

Enamel organ

-part of Dental lamina that forms enamel
-derived from ectoderm

Enamel organ goes through 3 stages

bud, cap, bell


inital budding from dental lamina at 10 thickened areas in each arch


-root formation=6 weeks
-deepedy parts of buds become slightly concave the


-the concavity of the cap grows
***-Stratum Intermedium layer appears

Successional lamina

-extends off dental lamina for perm tooth development
-Goes through bud, cap, bell stage
-perminant teeth that follow primary teeth

Primate space

-for secondary teeth
-found mesial to Max. primary canines
-found distal to mand. canines
-ALL primates have this space

Leeway space

-the difference between the space that deciduous(primary) molars
-larger in size
-take up a lot of space so when perminent replacements, which are smaller, have pleny of room when they erupt

Mesial drift

molars continuing to move mesially (forward) after eruption
Has 2 effects:
-spaces b/w primary teeth are closed as the perm. 1st molars push primary molard together
-if primary teeth lost early or interproximal decay is present and is not restored, the perm. molar will move mesially and fill that space

Characteristics of Primary teeth

-Constricted occlusal table
-Short root trunks
-Roots flare apically
-Large pulp chambers
-Enamel thin and consistent depth

Primary Occlusion

-Flush terminal plane
-Distal step
-Mesial step

Flush terminal plane

distal surfaces of Primary 2nd molars are even w/ each other

Distal step

-the mand. molars are more distal than max. molars
-Angles class II

Mesial step

-the mand. molars are more mesial than max. molars
-Angles class III
-majority of children

Eruption dates primary teeth

Mand 1st molar-> 6-7yrs (Nonsuccedaneous)
Max. 1st molar-> (Nonsuccedaneous)
Mand central-> 7-8yrs
Max central
Mand lateral 8-9yrs
Max lateral
Mand canine-> 9-10yrs
Mand 1st premolar-> 10-12yrs
Max 1st premolar
Max 2nd premolar
Max canine->11-12yrs
Mand 2nd premolar
Mand 2nd molar-> 12-13yrs (Nonsuccedaneous)
Max 2nd molar-> (Nonsuccedaneous)
Mand 3rd molar-> 17-22yrs-> (Nonsuccedaneous)
Max 3rd molar-> (Nonsuccedaneous)


perm teeth that does NOT replace deciduous teeth
Ex: perm molar, Max 2nd premolar


perm teeth that take the place of deciduous teeth

Mand canine

comes in 3 yrs later than max canines

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