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Quiz!
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Teeth are composed of 4 types of tissue? |
Enamel |
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Enamel |
Calcified |
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Dentin |
Calcified |
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Pulp |
Uncalcified |
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Cementum |
Calcified |
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Tooth Development begins with the interaction of ___________&_________? |
Oral Epithelial cells |
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Later _____________cells aid in tooth development? |
Neural Crest cells |
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Oral epithelial cells come from? |
Ectoderm |
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The dental lamina begins to form in which week of development? |
5th week |
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Tooth development begins which week? |
7th week (tooth buds) |
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What are the two major events in tooth development? |
Morphodifferentiation |
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Morphodifferentiation |
Dental Lamina-sheet of oral epithelium that grows down into the underlying ectomesenchyml |
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Oral epithelium cells form? |
Enamel Organ |
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Enamel organ form? |
Enamel |
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Mesenchymal cells form? |
dental papilla |
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Dental Papilla form? |
dentin and pulp |
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Neural Crest cells |
-migrate to the jaws |
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Neural Crest Cells |
Aid in tooth development |
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Cytodifferentiation |
Cells differentiate into specific tissue forming cells |
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Ameloblasts |
Enamel forming cells |
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Odontoblasts |
Dentin forming cells |
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Cementoblasts |
Cementum forming cells |
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Fibroblasts |
Pulp forming cells |
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The first stage of tooth development; formation of dental lamina? |
Morphodifferentiation |
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Dental Lamina |
forms the 20 Primary teeth and 12 permanent molars |
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20 areas of enlargement occur along the _________ |
Dental lamina |
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Successional lamina |
forms the 20 permanent teeth that replace the primary teeth |
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Dental Lamina remains active in the _____regions of the mouth until about age_____ with the formation of the ______. |
Posterior, 15, 3rd molars |
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The 12 posterior molars develop from the _____ |
general lamina |
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Stages of tooth development |
1. Bud Stage |
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Charac. of the Bud Stage of tooth development. |
Rounded, unspecialized, localized growth surrounded by mesenchyme |
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Charac. of the Cap Stage of tooth Development. |
Concave surface develops epithelial cells become the enamel organ |
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The enamel organ comes from which stage of tooth development? |
Cap Stage |
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What forms the dental Papilla? |
Mesenchyme |
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Cap stage has 2 features |
1. Enamel Organ |
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4 charac. of enamel organ |
-outer enamel epithelium OEE |
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outer enamel epithelium |
outside covers enamel organ 1 cell layer of cubodial cells |
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Inner enamel epithelium |
1 cell layer of cubodial cells will become ameloblast |
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Stratum intermedium |
2-3 cell layer thick, flat squamous cells, lie above the inner enamel epithelium, assist in the formation of enamel |
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stellate reticulum |
Star shaped, supporting cells that fill the bulk of the enamel organ |
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Dental papilla |
-composed of densley packed fibroblasts |
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Enamel and Dentin production happens in which stage of tooth development? |
Bell stage |
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Inner Enamel Epithelium becomes what? |
Ameloblast |
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Dental Papilla |
Cell closest to the IEE differentiate and become odontoblast-center cells that become dental pulp |
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Dental Follicle |
From mesenchyme, surrounds the developing tooth germ, provides cells that will form cementum, PDL, and Alveolar bone |
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Cervical loop |
Junction between inner/outer enamel epithelium |
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Ameloblast differentiate first from the _____ |
IEE |
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A basement membrane develops between the 2 cell layers and eventually becomes the |
DEJ |
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_______precedes______; |
Dentinogenesis precedes Amelogenesis; Dentin is formed before enamel |
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Dentinogenesis |
1st Cells of the IEE become ameloblast but remain dormat. |
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All dentin and enamel formation begins at the |
DEJ |
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Odontoblasts develop an elongated process that lies within_______ |
Dentinal Tubules |
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Dentin is a _____Tissue that continues to be produced throughout lifetime. |
Vital-the dentinal processes are living tissues. |
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______is sensitive? |
Dentin |
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Amelogenesis |
1st area formed is cusp tip and later they grow together |
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______form at the end of the ameloblasts taht are producing enamel? |
Tomes Processes |
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Time between amelogen deposition and mineralization is ______ |
Short |
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Enamel is ______tissue. |
NonVital |
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Mature enamel is ___% mineralized? |
95 |
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Amelogen---Enamelin-----_____? |
Enamel |
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REE |
Reduced Enamel Epithelium |
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REE is formed by? |
-Fusion of the ameloblasts with the cuticle |
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The REE remains on the surface of the enamel until the tooth_____? |
Erupts |
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Root Formation |
The place where the IEE and OEE meet is called the cervical loop. |
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The cervical loop becomes known as _______. |
Hertwigs epithelial root sheath |
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The point where root formation begins? |
Hertwigs epithelial root sheath. |
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2 Layers of the Hertwigs epithelial root sheath? |
1 outer layer |
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Inner layer |
Develp from ameloblast (IEE), induce the odontoblast of the dental papilla to form dentin that continues down from the crown to the root. |
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outer layer |
forms intermediate cementum (acellular) that seals out the root surface |
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After the root sheath deposits intermediate cementum, it breaks down and forms????? |
Epithelial rests |
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The epithelial rests move away from the root into the _______area? |
Follicular |
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Mesenchymal cells from the _______ contact the root surfaces and differentiate into_____? |
Follicle; cementoblasts |
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Cementum near the crown is _____? |
Thinner and Acellular |
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Cementum at the tooth apex is |
Thicker and more cellular |
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The primary function of the cementum is_____________? |
Attachment of the PDL |
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______produce cementoid. After it calcifies it is called????? |
Cementoblasts; cementum |
