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145 Cards in this Set
- Front
- Back
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Enamel is produced by
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ameloblasts
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The dentinal lamina develops for
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oral ectoderm
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First layer of dentin at the DEJ and DCJ is known as
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mantle dentin
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During formation, initial shape of the crown is determined by
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inner enamel epithelium
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Distrurbances in metabolism (different composition) known as
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countour lines of Owen.
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The bone supporting the tooth (alveolus) arises from
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dental follicle
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The shape of the crown is maintained by the
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Stellate reticulum
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The cervical loop gives rise to this structure
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Hertwig's epithelial root sheath
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Development of the primary tooth is always ___________ to the secondary tooth
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buccal
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The __________ gives rise to the permanent tooth.
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successional lamina
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This layer (layers) of cell aid in the mineralization of enamel
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stratum intermedium
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Ectomesenchyme gives rise to the
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dental papilla
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Most of cells in PDL are
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fibroblast
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This tissue is approximately 70% mineralized
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secondary dentin
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Tooth type determined by different cell types from neural crest
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Clonal theory
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Lamina propria of gingiva facing tooth originated from this
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dental follicle (sac)
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Hertwig's root sheath includes formation of
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root of tooth
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Enamel formed last at this region of the local environment
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field theory
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The process by which dentin is formed
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dentinogenesis
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Dentine with dentinal tubules filles with air is know as
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dead tracts
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This material is responsible for maintaining occlusion
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cellular cementum
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Mineralizated bodies often found in PDL near the furcation
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enamel pearl
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Structural units of enamel are the
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enamel rods
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Ends of odontoblast processes near the DCJ
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Tome's granular layer
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Crowding of ameloblast may result in this enamel defect
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gnarled enamel
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Hypomineralized enamel defects extending about one third into enamel
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enamel tufts
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The non mineralized matrix of cementum
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precementum
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Major protein found in dentin
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collagen
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Nerve network in close association tho the odontoblast layer
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Plexus of Raschkow
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Calcifications found within the pulp chamber
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denticles
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The end of ameloblast that enables it to produce enamel rods
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Tome's process
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Spaces found between collagen bundles in the PDL
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interstitium
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Ends of dentinal processes trapped in enamel
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enamel spindles
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Coronal two thirds of the root are covered by this material
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accelular cementum
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This defect is a result of dentinal tubules becoming filled with dentin
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sclerotic dentin
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Incomplete fusion of calcospherites results in
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globular dentin
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Dentin formed until external shape of the tooth is complete
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primary dentin
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This protein is removed during maturation of enamel
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amelogenins
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Cellular cementum is usually thicker than accelular cementum
T/F |
true
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Odontoblasts have junctional complexes with adjacent odontoblasts
T/F |
true
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Most accepted theory of dentin sensitivity is the direct innervation theory
T/F |
F
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Enamel rods extend from DEJ to surface of enamel...
T/F |
F
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Dental follicle is also known as dental sac
T/F |
T
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Enamel when first laid down is 30% mineralized
T/F |
T
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Etching patterns vary according to orientation of enamel crystals
T/F |
T
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Odontoblasts near the apical foramen in adult teeth are usually columnar
T/F |
F
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Dentin is deposited at a faster rate in root canal than in the pulp chamber
T/F |
F
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von Korff's fibers are found in primary dentin
T/F |
T
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Cementum is approximately 70% mineralized
T/F |
F
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Contact between adjacent crowns is maintained by horizontal fiber bundles
T/F |
F
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Contact between adjacent crowns is maintained by horizontal fiber bundles.
T/F |
F
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Lamina propria of gingiva facing the tooth arises from the dental follicle
T/F |
T
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Cementum is less resistant to resorption than lamina dura bone
T/F |
F
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The major blood vessels and nerve trunks are in the central pulp.
T/F |
T
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Dental lamina gives rise to the primary tooth
T/F |
T
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Blood vessels entering dental papilla other than at the apical foramen during root formation can result in accessory canals
T/F |
T
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During development each tooth has a dental lamina and a successional lamina.
T/F |
F
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First hard tissue formed is at the early bell stage of development
T/F |
F
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PDL fiber bundles are formed by fibroblasts
T/F |
F
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Oral cavity is lined by oral ectoderm
T/F |
T
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Fibroblasts originate from undifferentiated mesenchymal cells
T/F |
T
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Cellular cementum is usually thicker than acellular cementum
T/F |
T
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Bone is more resistant to resortion than cementum
T/F |
F
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Each enamel rod is formed by 4 ameloblasts
T/F |
T
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Enamel when first laid down is 70% mineralized
T/F |
F
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Amelogenins are the major proteins found in enamel
T/F |
T
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The major mineral found in enamel is calcium hydroxyapatite
T/F |
T
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Muscles of facial expression develop from the second pharyngeal arch
T/F |
T
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Secondary dentin continues to be laid down while pulp remains vital
T/F |
T
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Dental lamina gives to the the primary teeth.
T/F |
T
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Fully mineralized enamel is approximately 96 % mineralized
T/F |
T
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On an erupted tooth, damage to enamel can be repaired by ameloblasts
T/F |
F
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Acellular cementum functions to aid maintanance of occlusion.
T/F |
F
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Enamel tufts are clinically important
T/F |
F
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Cellular cementum is usually thicker than acellular cementum
T/F |
T
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Bone is more resistant to resorption than cementum
T/F |
F
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Each enamel rod is formed by 4 ameloblasts.
T/F |
T
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Enamel rod extend from the DEJ to the surface of enamel
T/F |
F
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Enamel when first laid down is 70% mineralized.
T/F |
F
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Collagen is the major protein found in developing enamel.
T/F |
F
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The major mineral found in enamel is calcium hydroxyapatite
T/F |
T
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Enamel lamellae are hypermineralized
T/F |
F
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Secondary dentin continues to be laid down while pulp remains vital
T/F |
T
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Tomes process iis necessary for enamel rod formation
T/F |
T
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Fully mineralized enamel is approximately 96% mineralized
T/F |
T
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On an erupted tooth, damage to enamel can be repaired by ameloblasts.
T/F |
F
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Acellular cementum functions to aid in maintenance of occlusion.
T/F |
F
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Enamel tufts are clinically important.
T/F |
F
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Odontoblasts have junctional complexes with adjacent odontoblasts.
T/F |
T
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von Korff's fibers are found in secondary dentin.
T/F |
F
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Tertiary dentin is usually formed to seal pulp from carious lesions.
T/F |
T
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Enamel when first laid down is 30% mineralized
T/F |
T
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Cementum is approximately 70% meneralized.
T/F |
F
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Epithelial rests of Malassez are fragments of Hertwig's Epithelial Root Sheath
T/F |
T
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Fibroblasts originate from undifferentiated mesenchymal cells
T/F |
T
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Dead tracts are dentinal tubulus filled with air
T/F |
T
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The major blood vessels and nerve trunks are in the central pulp.
T/F |
T
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Accessory canals have no clinical significance
T/F |
F
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Fibroblasts originate from undifferentiated mesenchymal cells
T/F |
T
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Dead tracts are dentinal tubulus filled with air
T/F |
T
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The major blood vessels and nerve trunks are in the central pulp.
T/F |
T
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Accessory canals have no clinical significance
T/F |
F
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Odontoblasts develop from
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undifferentiated mesenchymal cells
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These cells differentiate into ameloblasts
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Inner enamel epithelium
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Ameloblasts produce this material
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Enamel
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This is an invagination from the surface oral epithelium that develops into the enamel organ
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Dental lamina
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The ___________ cells differentiate into ameloblasts
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Inner enamel epithelium
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Ameloblasts produce
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Enamel
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The ____ is an invagination from the surface oral epithelium that develops into the enamel organ
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Dental lamina
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During enamel formation the ends of some odontoblast processes become trapped in enamel that is initially formed and are known as _____
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Enamel spindles
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During initial formation of the crown, the shape of the crown is maintained by the _____
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Stellate reticulum
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Disturbances in metabolism often result in lines being formed in the enamel that may be of slightly different composition than the rest of the enamel. Thes lines are known as _____
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Striae of Retzius
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The dental pulp develops from the
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Dental papilla
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The ________ gives rise to the cementum, periodontla ligament and the bone supporting the tooth.
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Dental follicle (dental sac)
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___________ arises form the cervical lop and is responsible for initiating growth of the root dentin
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Hertwig's epithelial root sheath
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Development of the secondary tooth is always ______ to the primary tooth.
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Lingual
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The permanent tooth develops from the
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Successional lamina
|
|
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This layer (layers)of cells aid in the differentiation of ameloblasts
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Stratum intermedium
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The dental papilla arises from connective tissue known as ______
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Ectomesenchyme
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|
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The odontoblasts develop from the ____ cells.
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Undiffentiated mesenchymal
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The process by which dentin is formed
|
dentinogenesis
|
|
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This defects in enamel extends from DEJ to surface of enamel and allows organisms to reach the DEJ.
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Enamel lamella
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This material covers the apical one third of the outer surface of the root
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cellular cementum
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These allow the tooth to be anchored to the periodontal ligament
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Sharpey's fibers
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Structural units of enamel
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Enamel rods
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Odontoblasts processes are found in these
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Dentinal tubules
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Hertwigs epithelial rooth sheath starts at this location in the enamel organ
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Cervical loop
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Structure that protects enamel until it erupts into the oral cavity
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Reduced enamel epithelium
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The non mineralized matrix of dentin
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Predentin
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Ridges that are found on the surface of newly erupted enamel
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Perikymata
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Nerve network that is in close association the odontoblast layer.
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Plexus of Raschkow
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Calcifications found within the pulp chamber
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Denticles
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A weaker enamel especially in intercuspal regions due to crowding of ameloblasts.
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Gnarled enamel
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These cells are found in the matrix of cementum
|
Cementocytes
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Enamel formation is known as
|
Amelogenesis
|
|
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Coronal two thirds of the root are covered by this material
|
Acellular cementum
|
|
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This material seals the pulp from substances that enter via the dentin.
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Tertiary dentin
|
|
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Incomplete fusion of these structures results in globular dentin.
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Calcospherites
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Branching of dentinal tubules results in this dark layer close to the DEJ
|
Tome's granular layer
|
|
|
This is the main structural protein in dentin
|
Collagen
|
|
|
This is an invagination from the surface oral epithelium that develops into the enamel organ.
|
Dental lamina
|
|
|
this gives rise to the dental papilla
|
Ectomesenchyme
|
|
|
This theory is that different types of cells fomr the neural crest give rise to the different cell types
|
Clonal
|
|
|
The bone supporting the tooth (alveolus) arises from this
|
Dental follicle
|
|
|
Dentin formed until external shape of the tooth is complete
|
Primary
|
