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32 Cards in this Set
- Front
- Back
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What is odontogenesis; When does it begin?
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Tooth Development; primary dentition begins in the 6th and 7th week of development
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What are the stages of odontogenesis?
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Initiation stage
Bud stage Cap stage Bell stage |
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Both dentitions form from what?
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Epithelial and Mesenchymal tissues
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What is the epithelium formed from the outer portion of ectoderm?
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Oral epithelium
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Tissue that is deep to oral epithelium and it originates from ectoderm
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Ectomesenchyme
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What separates the Oral Epithlium and the Ectomesenchyme in the stomodeum?
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The Basement Membrane
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What week does the Dental Lamina form?
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The 7th week
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From what structure does the dental lamina come from?
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Oral Epithelium
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What is the first sign of tooth formation?
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The dental lamina
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Once the dental lamina forms a sheet of epithelial cells, it pushes into what?
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The underlying mesenchyme in the maxillary and mandibular jaws
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During what week of development does the successional and general lamina form?
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The 6th week
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Which teeth are formed from the general lamina?
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The permenant molars
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T/F: During the Bud stage, the basement membrane between the bud and the mesenchyme disintergrates.
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False!! The basement membrane remains between the two structures
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Rounded, localized growth of epithelial cells surrounded by condensing mesenchymal cells
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The Bud Stage
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At what stage does the bud enlarge and gain a concave surface?
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The Cap Stage
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In the Cap stage, what do the epithelial cells change into?
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The EO (enamel organ). It remains attached to the dental lamina
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What is dental papilla formed from?
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Mesenchyme
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The dental papilla develops into what two structures?
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Dental pulp and Dentin
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What is the dental follicle?
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Tissue surrounding the EO and dental papilla
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What forms the DEJ (dentinoenamel junction)?
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The basemen membrane between EO and dental papilla
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What week of development does the initiation for the permanent anterior dentition begin?
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The 10th week
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T/F: The initially formed permanent teeth appear as an extension of the dental lamina lingual to the primary tooth germ
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True
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During the Bell stage, the OE changes into what two structures?
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The outer enamel epitheium (OEE) and the inner enamel epithelium (IEE)
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The IEE changes into what?
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Ameloblasts
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What structure lies between the OEE and IEE?
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Stellate reticulum
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During the Bell stage, cells in the outer dental papilla becomes what?
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Odontoblasts
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During the Bell stage, the central cells of the dental papilla becomes what?
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Pulp primordium
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Odontoblasts forms a matrix of what?
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Predentin (collagen); calcifies in 24 hrs and becomes dentin
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Which comes first, dentinogensis or amelogenesis?
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Dentinogenesis
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When does the dental lamina disintergrate?
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After the differentation of the EO
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The formation of ______ _______ occurs when the differentation of outer cells of dental papilla in the root area become odontoblasts.
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Root Dentin
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Once the rooth sheath disintergrates, what do the cells become?
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Epithelial Rests Of Malassez (ERM)
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