Tooth Development
When is the primary dentition formed?
What is derived from the mesoderm?
Connective Tissue
What week does the bud stage begin?
8th week of prenatal development
What weeks does the Cap stage occur?
Between the 9th and 10th week
How is the tooth formed in this stage?
Crown forms then the root
When is most of the permanent dentition formed?
During the fetal period
What is the main process of the initiation stage?
Induction
How many buds will each arch have after proliferation?
10 buds EACH arch
What happens in the cap stage?
Unequal parts of the tooth germ grows to create a cap look around the ectomesenchyme
What is a tooth within a tooth called?
Dens in Dente
(maxillary incisors mostly affected by this)
What is the process of tooth development called?
Odontogenesis
What is the name for the outer part of ectoderm when it forms?
Oral epithelium
What is an developmental disturbance associated with the bud stage?
-Macrodontia: large teeth
-Microdontia: small teeth
What is the predominant developmental process during the cap stage called?
Morphogenesis
What is the called when "two teeth combined into one which makes it look like one large tooth?"
Germination
How many stages are in tooth development?
6
What is the most common missing teeth?
Mandibular 2nd premolars
The bud stage involved what?
Extensive proliferation of each of the dental placodes into deeper ectomesenchyme forming buds
What is a "part of the ectomesenchyme deep to the buds now condensed into a mass within the concavity of the cap" (the inner mass of the ectomesenchyme) called? This also produces the future dentin and pulp for the inner part of the tooth.
Dental papilla
What are small rounded enamel extensions forming extra cusps called?
Tubercles
Odontogenesis of the primary dentition begins between what weeks?
6th- 12th
What are the developmental disturbances associated with the initiation stage?
-Anodontia: missing teeth (disrupts occlusion)
-Supernumerary Tooth or Teeth: extra teeth (crowding, disrupts occlusion, and fails to erupt)
Permanent maxillary later incisor and permanent third molar
How does the crown of the succedaneums permanent teeth erupt compared to the roots?
Lingually
What are the three tooth germs during the cap stage?
-Enamel Organ: formation of tooth bud
-Dental Papilla: condensed mass of ectomesenchyme within concavity
-Dental Sac: condensed mass of ectomesenchyme surrounding enamel organ