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26 Cards in this Set
- Front
- Back
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Continued proliferation of the cervical loop toward the apical region of dental papilla will form what structure?
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Hertwigs Epithelial Root Sheath
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What two layers of cells make up Hertwigs Epithelial Root Sheath (HERS)?
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Inner dental epithelium
Outer dental epithelium |
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What are two functions performed by HERS?
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1) Induces superficial cells of dental papilla to differentiate into odontoblasts
2) Defines shape of root |
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How are multi-rooted teeth formed?
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Via mitotic activity in HERS
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What are ridges of epithelium that proliferate centrally, fuse near the midline of tooth, and induce ondontoblast differentiation?
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Epithelial Diaphragms
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Where will the partially degenerated root sheath persist throughout life?
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It will persist within the periodontal ligament
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What are remnants of Hertwigs Root Sheath which appear as clusters of epithelial cells?
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Epithelial Rests of Malassez
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What initiates cementogensis?
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When mesenchymal cells of the dental follicle contact the root surface.
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What will the mesenchymal cells differentiate into when they contact the root surface?
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Cementoblasts
(round nuclei, inconspicuous cytoplasm) |
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What is an amorphous hypermineralized layer of dentin on the outer root surface?
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Hyalin Layer of Hopewell Smith
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Where is this layer derived?
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Dental follicle
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Prior to full mineralization of this layer, what is the action of cementoblasts?
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cementoblasts will insert cell processes into this layer and deposit collagen at 90 degree angles.
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Uncalcified cementum matrix produced by cementoblasts
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Cementoid
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What other products are secreted into cementoid by cementum?
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Bone sialoprotein
osteocalcin |
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What surface of the root is covered by primary cementum?
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coronal 2/3
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What is formed when fibroblasts from PDL insert collagen fibers into primary cementum?
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Sharpey's Fibers
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Additional cementum that is produced when the tooth reaches occlusion is called?
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Secondary cementum
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Where is secondary cementum deposited?
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Apical 1/3 of root, interradicular regions
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In comparison to primary cementum is secondary cementum production faster or slower?
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faster
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Why is secondary cementum prodution faster than primary cementum production?
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cementoblasts secrete matrix vesicles instead of inserting cell processes
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What arrangement is secondary cementum in relation to root surface?
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Parallel
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Cementoblasts trapped in lacunae of mineralizing matrix are called
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Cementocytes
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Do cementocytes communicate with one another due to cell processes in lacunae?
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No
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Cementum with cementocytes that continues to form with reorganization of the PDL is called
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Cellular cementum
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Where is cellular cementum found?
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Apical 1/3 of root
Interradicular areas |
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What is an interradicular area?
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Area at furcation point of roots
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