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44 terms

Life Cycle of tooth

STUDY
PLAY
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