Question | Answer |
What are the 5 phases of odontogenesis? | 1. Induction/Initiation
2. Proliferation
3. Morphodifferentiation
4. Histodifferentiation
5. Apposition/Maturation |
What are the 4 stages of development? | 1. Bud
2. Cap
3. Bell
4. Crown |
What are two phenomena that occur in the cap stage? | 1. The initiation of the permanent tooth dental lamina (secondary dental lamina) begins lingual to the developing primary tooth.
2. The formation of the tooth germ occurs. |
Name the 3 parts of the tooth germ. | 1. Enamel Organ (derived from ectoderm)
2. Dental Papilla (derived from ectomesenchyme)
3. Dental Sac (derived from ectomesenchyme) |
What are the 5 layers of the enamel organ? | 1. Basement Membrane
2. Inner Enamel Epithelium
3. Stratum Intermedium
4. Stellate Reticulum
5. Outer Enamel Epithelium |
What are Glands or Pearls of Serres? | Residual dental lamina cells. They have the ability to form odontogenic cysts in later life. |
Contact between the dental sac cells and the dentinal cells causes the dental sac cells to differentiate into what kinds of cells? | Fibroblasts- form PDL
Cementoblasts- form cementum
Osteoblasts- form alveolar bone |
What are Rests of Malassez? | Any remnant cells of Hertwig's Root Sheath caught within the PDL. They have the ability to form odontogenic cysts later in life. |