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146 Cards in this Set
- Front
- Back
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The enamel matrix is secreted from.....
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Tomes Process
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Bone that forms between the roots of multirooted dentition is called....
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interridicular bone
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Another name for imbrication lines
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Lines of Von Ebner
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Underlies matle dentin , bulk of tooths primary dentin
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Circumpupal dentin
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Tubulesmay calcify and mineralize creating.....
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Sclerotic dentin
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True or False?
Bone, dentin, cementum, and enamel grow by incremental deposition of matrix and mineral? |
True
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The tissue bneath the oronasal groove developes the ....
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Nasolacrimal duct
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What brachial arch makes up the anterior of the tounge and posterior of the tongue?
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Anterior - Arch 1
Posterior - Arch 2&3 |
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Formed by tongue base posterior to the termanalis sulcus
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lingual tonsils
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Later_______cells aid in tooth development
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Nural Crest
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In what week of embryotic development does the dental lamina form?
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week 7
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What tooth development stage has rounded, unspecailized, localized growth surronded by mesenchyme cells
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Bud Stage
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2 features of the cap stage?
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Enamel Organ
Dental Papilla |
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At which stage of tooth development is the inner enamel epithellium characterized by the shape of the tooth they form?
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Bell Stage
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Outer cells of dental papilla
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odontoblasts
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Where cells closest to the inner enamel epithellium differentiate and become odontoblasts - center cells that become dental pulp
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Dental Papilla
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Name three types of denticles (pulp stones)
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Free
Attached Embeded |
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Residue on newly erupted dentition
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Nasmyths membrane
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Pulp enters peridontium through the ......
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Apical foreamen
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Eanmel rods are _______ to enamel surface at the cervical region.
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Perpendicular
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Line of _____ happens at birth due to nutritional changes.
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Retzius
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Dentin deposited first along DEJ and nearly free of development defects.
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Mantle Dentin
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Development of palate begins in week....
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week 8
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True or False
The peridontial ligament is thinnest in the midroot zone? |
True
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______ is the fastest growing organ.
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Heart
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Zone of fusion between epithelial coverings of medial nasal process and maxillary process.
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nasal fin
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The epithelial rests move away from root into the _______ area.
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follicular
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The 3 layers of pulp vessel linning are....
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intima
media adentitia |
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Dark lines showing age of enamel rods.
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Straie of Retzius
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Hypocalcified zones caused by bending of adjacent groups of rods.
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Tufts
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Dentin due to pulpal stimulation which creates a greater distance from pulp.
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Reparative or tertiary dentin
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Which happens most often?
A) Cementum overlaps enamel B) cementum and enamel meet C) both A & B |
A) Cementum overlaps enamel
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Brachial arch 1 developes.....
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maxillary and mandibular arches
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True or False
In week 7 the danger of a cleft lip is greatest? |
False
In week 7 the danger for a cleft lip has passed |
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The thyroid is attached tp the tongue by _______ which eventuall disintegrates.
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thyroglossal duct
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Oral epithellium cells come from?
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ectoderm
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Permenant teeth form from ______ lamina?
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general
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OE cells form the....
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Enamel Organ
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the Cap stage happens at what week of gestation?
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9-10
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Basement membrane between enamel organ and dental papilla
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DEJ
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1 cell layer of cubodial cells, will become ameloblasts
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inner enamel epi
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What is composed of densley packed fibroblasts, influencing bud stage to develop into cap & bell stage, cells at periphery differentiate into odontoblasts that will produce dentin
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Dental papilla
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Differentiates into ameloblasts in the bell stage
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Inner enamel epi
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Ameloblasts differentiate first from the ...
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Inner Enamel Epi
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Tappered portion of each ameloblast that faces disentigrating basement membrane
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Tomes process
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This area produces cells needed for root lengthning?
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pulp proliferation zone
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True or False
The DEJ is more scalloped from the facial view? |
False
It is more scalloped from the occlusal incisal view |
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Enamel is deposited _______ from ____ in keyhole formation by ameloblasts.
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peripherially
DEJ |
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_______ are result of termination of Straie of Retzius on enamel surface.
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ridges
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Dentin that occurs when pressure happens, mostly in the roof and floor of pulp and may have incremental lines.
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secondary dentin
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Name, in order, the 4 layers of the enamel organ at the bell stage of tooth development starting at the cusp tip basement membrane.
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odontolblasts
stratum intermedium stelatte reticulum inner enamel epi |
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odontoblasts develop as elongated process that lies within _________
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dentin tubules
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The primary function of cementum is ......
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attachment of PDL
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Fine particles of cut debris that are produced by cavity preperation.
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Smear layer
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Odontoplastic proxesses are larger in diameter near ___ and taper around _____
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pulp
DEJ |
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A living tissue of the tooth that is not normally exposed to oral enviornment.
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Dentin
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Most pulp nerve endings are in what area?
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odontoblastic zone of pulp horns
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True or Flase
Incremential lineas are due to rhythmic, recurrent deposition of enamel? |
True
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In week 6 the nasal processes are limited to
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middle of upper lip
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Tongue development happens in what week of gestation?
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7-9
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Unclacified portion of tooth with blood vessels and nerves
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pulp
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Deep to oral epithellium is considered......
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ectomesenchyme
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Enamel forming cells
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ameloblasts
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What is it called when the dental laminia - sheet of OE that grows down into the underlying ectomesenchymal
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morphodifferentiation
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The bell stage happens at what week of gestation?
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11-12
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Stelliate reticulum synthasize ______ which retains water and gives the cell its star shape
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GAG
(glycoamonoglycons) |
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All dentin and enamel formation begins at the ______
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DEJ
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After disentigration of root sheath its cells may become
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epi rests of malassez
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Name the 3 pain theories in order of most to least accepted
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Hydrodynamic theory
Transduction theroy Direct Innervation |
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Termination of dental tubules in enamel
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Spindles
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Ostodontic process penetrate dentin from ______ to _______
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pulp to DEJ
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True or False
Enamel rods consist of head, neck, and tail? |
True
1 ameloblast - head 2 form- neck 1 form - tail |
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Face primarily developes from tissues surronding the ______
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Oral pit
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What apperas at the upper lip borders in week 5 and eventually developes into nostrils
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Bilateral nasal placodes
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During what week of gestation does the fetus take on a more human apperance?
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Week 7
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The palate developes from two _______ and one _________
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lateral palentine processes
medial process |
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What two arches do muscles join together to form tongue?
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Brachial arch 1 & 2
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Seperates surface of body and nase of tongue
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sulcus terminalis
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In week _____ the thyroid decends to the front of ______
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7
trachea |
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Calcified crown to root
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dentin
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tooth development begins with the interaction of ________ and __________
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OE cells
mesenchymal cells |
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Neural crest cells function by intergrating the _______ and epi cells of the early ______, which aids in the development of the tooth
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dental papilla
enamel organ |
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In what week of gestation do the primary teeth start to develop?
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weel 7-8
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Lamina formed for permanent teeth, not including molars.
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successional lamina
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The initial lamina that forms both primary and permanent teeth begins to function in to _____ week and continues to grow until the _____ year producing all 52 teeth.
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6th
15 |
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Dental papilla form the ______ & _______
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dentin
pulp |
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pulp forming cells
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fibroblasts
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concave surface developes & epi cells become enamel organ in what tooth development stage?
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Cap stage
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The enamel organ comes from which stage of tooth development?
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Cap stage
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What are the two major events in tooth development?
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Morophodifferentation
cytodifferentiation |
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What forms the dental papilla?
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mesenchyme
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Outside covers enamel organ, 1 cell layer of cubodial cells
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Outer enamel epi
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Bell stage can also be called the ________ stage
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histodifferentiation
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What functions to organize a network of capillaries that will bring nutrition to the ameloblasts?
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Outer Enamel Epi (OEE)
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Concavity of enamel organ differentiates into ____ and _____ in the bell stage
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Odontoblasts
pulp primordium |
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Inner enamel Epi becomes .......
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ameloblasts
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Junction between inner/oyer enamel epi
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Cervical loop
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When enamel, dentin, and cementum are secreated in successive layers
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Apposition
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Initial formation of dentin at the cuspal tips and the vascularation of the pulp is called..
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dentinogenesis
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Apposition of the enamel matrix is called....
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amelogenesis
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The cervical loop becomes known as _______
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Hertwigs epi rooth sheath
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During active erruption layers of enamel organ are compressed, forming.....
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reduced enamel spi
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Encircles the apical opening of the dental pulpduring root development.
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Epithelial diaphragm
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Pulp stones AKA ________
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denticles
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List the 5 functions of pulp
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initative
reparative formative protective nutrative |
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What is more calcified:
Peritubular dentin or intertubular dentin? |
peritubular dentin
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Cutoplasmic extentsions of cell body that are positioned at pulp/dentin border
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odontoblastic cell processes
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Enamel is made of _____
Dentin is made of _______ |
rods
spindles (tubules) |
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Enamel rods cure slightly to
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cusp tip
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Enamel defects filled with organic material - located at DEJ at a right angle - Occur due to compression of enamel through mastication
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Enamel tufts
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Major component of crown and root includes mantle dentin and cirumpupal dentin
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primary dentin
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True or False
Tertiary dentin only forms at site of osteoblastic activation? |
true
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Dentin is more radio______ than enamel and more radio______ than pulp.
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lucent
paque |
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Development of the face happens at what week of gestation?
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4-7
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Lines that result in rythmic deposition of enamel and are visable growth lines on surface of enamel
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perikymata
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What arises from the dental follicle?
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dental follicle tissues and cementicles
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True or flase
The development of the lip depends on the fusion of philtrum and maxillary process? |
True
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madible eventually articulates with .....
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temporal bone
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What arch contributes to the face and also forms parts of the external ear?
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Hyoid arch
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What makes up the border of the lip?
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2 maxillary processes
1 mandibular process |
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These fuse together to form the ears....how many dose the ears developemnt begin with?
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Auricular hillocks
6 3- from mandibular arch 3 from maxillary arch |
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Bony structure that suspends oral and nasal cavities, cuts communication bwtween nasal and oral cavities
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palate
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The tongue originates from muscles of _______
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occipital myotomes
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The tongue has intervention of what four cranial nerves?
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V, VII, IX, X
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Thyroid gald is fromed from the _______
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foramen cecum
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Calcified white layer of tooth
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enamel
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smallest calcified layer of tooth
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cementum
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what other functions of developement do the nueral crest cells aid in?
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development of:
salivary glands bone cartilage nerves muscles of face |
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What are the four stages, in order, of tooth developement
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initiation
bud cap bell |
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Once which two tissues interact, the intiation stage begins
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Oral Epi
Ectomesenchyme |
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Areas of enlargement at the edge of the dental lamina
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tooth buds
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mesenchymal cells form ______
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dental papilla
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Dentin forming cells
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odontoblasts
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During the bud stage the ectomesenchyme undergoes
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proliferation
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Tissue surronding enamel organ and dental papilla
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dental sac (follicle)
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Cells differntiate into specific tissue forming cells is called
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cytodifferentiation
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What are the four characteristics of the enamel organ?
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Outer enamel epi
Inner enamel epi Stratum intermedium Stellate reticulum |
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4th layer in enamel organ 2-3 layers of flat squamus cells, lies above IEE and assists in formation of enamel
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stratum intermedium
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Enamel and Dentin production happens at what stage of tooth development?
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Bell stage
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At the bell stage Oral epidiffernetiates into ...
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Outer enamel epi
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The tooth germ is made up of _______, ________, and ______
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Enamel organ
Dental papilla Dental sac |
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Central cells of dental papilla
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pulp primordium
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Provides cells that will form cementum, PDL, and aveolar bone - surronds tooth germ
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Dental follice
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Forms matrix of predentin
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odontoblasts
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Dentogentisis _________ Amelogenisis
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Proceeds
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Detin is formed _______ enamel
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before
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