Life Cycle of tooth

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Growth, Calcification, Eruption

Developmental processes of teeth

Growth is also called

Bud/ initiation

Growth

"Bud stage" Tooth formation begins; follows a definite pattern and takes place at a different time for each tooth

Dental lamina

oral epithelium thickens and follows curve of each developing arch

Tooth buds

dental lamina produces 10 enlargements (tooth buds) in each arch

Tooth buds for 1st permanent molars form when

17 weeks inutero

Tooth buds for 2nd permanent molar forms when

6 months after birth

Tooth buds for 3rd permanent molar forms when

5 years old

Cap Stage

Also called proliferation; cells of developing tooth grow and increase in number; developing tooth change in size and proportion; tooth bud changes into hollowed caplike shape

Succedaneous teeth

Permanent teeth that replace primary teeth; develop from tooth buds deep in dental lamina

Succedaneous teeth form as early as

24 weeks

Enamel organ also called

Dental organ

Enamel organ (cap stage)

Originates from ectoderm layer; tooth bud enlarges to become enamel organ which eventually forms enamel; Shallow indented area appears along lower margin of enamel giving the shape of a cap

Dental papilla

Originates from mesoderm; cells of connective tissue proliferate and eventually form dental pulp and dentin

Dental sac

Mesenchyme froms dense band of connective tissue which surrounds enamel organ and dental papilla; sac becomes periodontal ligament and cementum

Bell stage

Differnt tissues of tooth form and shape of tooth is established; as cells increase in number, they layer into shape of a bell

Histo means

tissue

differentiation means

to become different

Histodifferentiation

Ameloblasts, odontoblasts, cementoblast

Ameloblasts

epithelial cells which form enamel

Odontoblasts

perpheral cells of dental papilla which form dentin

Cementoblast

inner cells of dental sac which form cementum

Morphodifferentiation

Basic size and shape of each tooth is established

Calcification

Structural outline formed earlier is hardened by deposits of calciun and other salts; enamel is built layer by layer

Enamel is built in layers

starts at DEJ (dentoenamel junction) and progresses outward; starts at top of crown and progresses downward over sides

DEJ means

dentoenamel junction

Blast means

create (forming or building cells)

Osteo means

bone

Clast means

take away

Osteoblasts mean

creating bone

Osteoclasts mean

taking bone away

Eruption

movement of tooth into its functional position; takes place in chronological order; Tissue in area disintegrates causing inflammation and tenderness

Eruption of primary teeth is called

teething

Ectoderm

enamel

Mesoderm

dentin, pulp, periodontal ligament, cementum

Endoderm

No dental structures form

Enamel organ creates what cell

ameloblasts

Dental papilla creates what cell

odontablasts and fibroblasts

Dental sac creates what cell

fibroblasts and cementoblasts

Ameloblasts create

enamel

Odontoblasts creates

dentin

Fibroblasts (dental papilla) creates

pulp

Fibroblasts (dental sac) creates

periodontal ligament

Cementoblasts creates

cementum

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