Study Files Flashcards by Alex Kusek

Junction between primary and secondary dentin is characterized by:

Sharp change in direction of dentinal tubules

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Odontoblasts arise during time that ameloblasts are in what stage of development

Organizing

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Dentin is frequently synthesized and calcified as

Globular Dentin

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Synthesis of dentin begins the ______ stage

Late Bell

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Dentin synthesis begins _____ and proceeds _____

Coronally

Apically

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Dentin Matrix contains

Type I Collagen, GAGs, glycoproteins

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Dentin is derived from ______ only

Ectomesenchyme

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Peritubular/Intratubular dentin is _____ mineralized than Intertubular dentin

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First formed portion of dentin is

Mantle Dentin

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Near the DEJ, dentinal tubules may

Branch

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Canaliculi in dentin are branches of

Dentinal Tubules

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Tomes’ processes form during _____ stage of Ameloblasts life cycle

Formative (?)

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Granular layer of Tome’s is found

Near cementum

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Ameloblasts contain microvilli during _____ stage

Maturation

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First branchial arch consists of

Maxillary and Mandibular prominence

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What three components are initially present in each pharyngeal arch

Nerve, Cartilage, and artery

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Which component of alveolar bone proper is adjacent to cementum

Bundle bone (Sharpey’s fibers)

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Establishment of foregut and stomatodeum results from _______ of the embryo

Cephalic Folding

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What is responsible for cephalic folding of embryo

Rapid growth of neural tube

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Skeletal tissues of facial region are _____ in origin

Ectomesenchyme

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Anterior 2/3 of tongue develops from

Lateral lingual swellings and Tuberculum Impar

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The _____ branchial arch doesn’t persist in humans

5th

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What arises from 3rd Pharyngeal Pouch

Inferior Parathyroid Gland

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Muscles of mastication and muscles of facial expression are both derived from

Mesoderm

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Number of roots that are formed is determined by

Number of medial ingrowths of cervical loop

What is responsible for lateral folding of embryo

Growth of somites

Hypobranchial Eminence is derivative of which pharyngeal arch

3rd

Lateral Lingual swellings are derivatives of which pharyngeal arch

1st

A cervical sinus may arise from

Failure of branchial clefts to fuse completely

_____ lines may be present in bundle bone, appear as basophilic lines in boney matrix, and are found adjacent to Haversian canals

Reversal

Palatine Tonsils arise from ____ branchial pouch

2nd

Dental Lamina lasts for how long

5 years

Neural Crest ectoderm develops from

Somites

As the tooth develops the root grows

Toward the Oral Epithelium

Which component of enamel organ secretes GAGs

Stellate Reticulum

*During the evolution of vertebrate jaw the TMJ in amphibians, reptiles and mammal-like reptiles was formed by

The Articular and Quadrate bones

Dental Organ is a product of

Oral Ectoderm

What may be responsible for cephalic folding of embryo

Rapid growth of neural tube

Incremental lines in Dentin are called _____ and Incremental lines in Enamel are called ______

Von Ebner | Retzius

Enamel Spindles are thought to form

Odontoblastic processes penetrating between ameloblasts

Oblique fibers resist which movements of tooth

Apical

Interradicular fibers resist which tooth movements

Torquing and Tipping

Apical fibers resist which tooth movement

Dislocation and Tipping

Which two features may be found in both cellular and acellular cementum

Sharpey's fibers | Incremental lines

Lines of Von Ebner are _____ to the axis of dentinal tubules

Perpendicular

Tomes Granular layer is only found in _____

Root Dentin

______ secrete procollagen peptidase

Odontoblasts

Secretion of matrix granules and enamel proteins is characteristic of what stage of the ameloblast

Formative

Which stage of ameloblasts exhibits activity known as modulation

Maturation

Enamel Rod Sheaths appear different from rest of enamel rod because:

Have higher organic content | Have different orientation of hydroxyapatite cyrstals

Zone of Weil is found between ____ and ____

Odontoblasts | Pulp

Epithelial rests of Malessez are separated from PDL by_____

Basal Lamina

Langerhan cells have _____ receptors

IgG

Mucoperiosteum is found in

Hard Palate and Attached Gingiva

Junctional epithelium attaches to enamel by

Hemidesmosomes and Basal Lamina

Odontoblasts may arise from

Monocytes

During eruption the Reduced Enamel Epithelium may fuse with

Oral Epithelium

Salivary gland acini are surrounded by contractile cells called

Myoepithelial cells

Fibroblasts of PDL are connected to each other by

Cell to Cell junctions

Free gingiva can be distinguished from attachment epithelium because attachment epithelium

Has no rete pegs

Calcified remnants of HERS are called

Cementicles

Dark staining granules of Stratum Granulosum are

Keratohyalin types

Tonofilaments in keratinocytes are described as

Keratin filaments (?)

Maxillary sinus is lined by

Respiratory epithelium

_____ is present in the epithelium lining the maxillary sinus

Cilia

Which areas are minor salivary glands found

Lips, Cheeks, Palate, and Tongue

When a tooth first erupts into oral cavity the attachment epithelium is derived from

Reduced Enamel Epithelium

Number of roots that are formed is determined by

Number of medial ingrowths of cervical loop

In sulcular epithelium small spaces between cells in stratum spinosum are normally filled with

Small amount of fluid

Circular fibers are present in ____ and _____ the tooth

Free Gingiva | Encircle

Continuity of HERS must be broken for what to occur during tooth development

Deposition of cementum

In salivary glands, folds of the basal portion of cell membrane containing mitochondria are characteristic of

Cells of Striated Ducts

In the pulp, an increase in age will increase both

Number of collagen fibers | Calcification within pulp

HERS is characterized by

Formation of cell rests in PDL when sheath's function have been accomplished Absence of stellate reticululm and stratum intermedium

In the embryo, the palate is separated from lip by shallow sulcus in depths of which two epithelial lamina arise; the outer lamina is

Vestibular Lamina

Thyroid arises from

Foramen Caecum

Foregut of embryo is lined by

Endoderm

Primary palate forms from fusion of

Medial Nasal Processes

Convexities in reversal lines point toward

Old Bone

Convexities in reversal lines represent

Howships lacunae

Base of fetal skull is formed by

Chondrocranium

In a cross-section of crown of tooth, Lines of Retzius appear as

Concentric Rings

Epithelial Rests of Malessez arise from

Cells of HERS

Cementum grows by ____ only

Apposition

IEE can first be identified in

Cap Stage

Synthesis of dentin begins in the

Late Bell Stage

Dentin synthesis begins ___ and proceeds _____

Coronally, Apically