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Histopathology > Tooth Development > Flashcards

Tooth Development Flashcards

1
Q

Cell layer of the bell stage that plays a supportive function in enamel production

A

Stellate reticulum

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2
Q

Stage of tooth development that includes maturation

A

Maturation

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3
Q

____ is comprised of multiple, small tooth-like structures

A

Compound Odontoma

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4
Q

_____ is the junction of the outer and inner enamel epithelia; site of cemento-enamel junction (CEJ) in the adult tooth

A

Cervical loop

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5
Q

____ formations stops at the termination of the enamel organ

A

Enamel

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6
Q

_____ is the most common neoplastic lesion arising from odontogenic epithelium; considered a slow growing, locally invasive tumor; lesions have a multilocular or soap bubble appearance on radiographs

A

Ameloblastoma

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7
Q

Cell layer of the bell stage outer cells differentiate into odontoblasts, whereas inner cell differentiate into pulp tissue

A

Dental papilla

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8
Q

Ectoderm invaginates into the mesenchyme and is now called _____; separated from the surrounding mesenchyme by a basement membrane

A

Dental lamina

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9
Q

____ is the most common manifestation of supernumerary tooth formation

A

Mesodens

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10
Q

Cell layer of the bell stage that forms a protective barrier

A

Outer enamel epithelium

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11
Q

Actively secreting ameloblasts are _____ cells

A

tall columnar cells

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12
Q

_____ is an enlargement of the body and pulp chamber of multirooted teeth with apical displacement of the bifurcation; exceptionally long root trunk with very short roots; epithelial diaphragm with Hertwig’s root sheath malfunction

A

Taurodontism

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13
Q

______ root is due to accelerated ortho or hertwig’s root sheath

A

Shorted root

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14
Q

____ specifies the dental nature of mesenchyme

A

Epithelium

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15
Q

Stage of tooth development that includes induction and proliferation

A

Apposition

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16
Q

Stage of tooth development that includes proliferation, differentiation, and morphogenesis; this stage is considered the most important

A

Bell stage

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17
Q

Stage of tooth development that includes cellular proliferation (growth)

A

Bud Stage

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18
Q

_____ is the fusion and apical extension of the outer and inner enamel epithelia; determines the outline of the root dentin and the number of roots a tooth will have; it is removed before the cementum is laid down

A

Hertwig’s Epithelial Root Sheath

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19
Q

Inactive ameloblasts are _____ or ____ cells

A

short columnar or elongated cuboidal cells

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20
Q

____ is when tooth count is normal when the double tooth is counted as one

A

Gemination

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21
Q

Abnormal _____ formation is due to an issue with epithelial diaphragm with Hertwig’s root sheath

A

Abnormal root formation

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22
Q

A _____ is lined with epithelial cells with an open lumen

A

Cyst

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23
Q

____ is a defect that originates during cap stage of development that results in large single-rooted tooth with one pulp cavity and exhibits twinning in crown area

A

Gemination

24
Q

____ is considered undifferentiated pulp and odontoblasts

A

Dental papilla

25
Q

____ formation continues of the enamel organ and pushes the tooth occlusally

A

Dentin

26
Q

____ originates by separation of the dental follicle (sac) from the crown of the unerupted tooth; cyst is attached at the CEJ; this cyst type comprises 20% of all jaw cysts

A

Dentigerous cyst

27
Q

Cyst wall consists of a 6-8 cell layer of stratified squamous epithelium with parakeratosis at the luminal surface; lumen is often filled with keratin; presence of inflammation will generally cause epithelial proliferation and palisading of the basal cell layer

A

Keratocystic Odontogenic Tumor or (OKC)

28
Q

______ specifies tooth type and nature of the product produced by the epithelium

A

Mesenchyme

29
Q

____ arises from the cells rests of the dental lamina; bone expanding cysts; located mostly in the posterior mandible often present as multilocular lesions; 60% of all cases between the ages of 10-40; 65% of cases are located in mandible; there is a 30% recurrence rate after surgical removable

A

Keratocystic Odontogenic Tumor or (OKC)

30
Q

_____ plays a supportive role to hold shape of the enamel organ

A

Stellate reticulum

31
Q

____ refers to the total lack of tooth development

A

Anodontia

32
Q

_____ is more proteinaceous not yet calcified

A

Enamel matrix

33
Q

_____ dictates what the group of cells will form; plays an instructional role during the pre-tooth bud stage of tooth formation

A

Epithelium

34
Q

____ is defined as an abnormal angulation or bend in root; Hertwig’s root sheath bend

A

Dilaceration

35
Q

____ is the 1st formed dentin, 30-50 microns thick, contains both type 1 and 3 collagen, and collagen fibers in the matrix are oriented perpendicular to the DEJ

A

Mantle dentin

36
Q

_____ stimulates ameloblasts to separate enamel matrix

A

Mantle dentin

37
Q

____ is the development of increased number of teeth (the additional teeth are termed supernumerary)

A

Hyperdontia

38
Q

Root length is not complete until _____ years after the tooth has emerged into the oral cavity; pulp chamber narrows and apical opening constricts

A

1-3 years

39
Q

At what stage are all the layers of the enamel organ identifiable?

A

Bell stage

40
Q

At the final stage of mineralization, the reduced ameloblasts with the remaining cells of the outer enamel epithelium, stellate reticulum, and stratum intermedium form a membrane on the surface of the enamel; squishes all layers of enamel epithelium, stellate reticulum, and stratum intermedium

A

Primary cuticle

41
Q

____ refers to a double tooth in which the tooth count reveals a missing tooth when the double tooth is counted as one

A

Fusion

42
Q

_____ is a defect that originates during initiation stage that results in development of one or more extra teeth

A

Supernumerary teeth

43
Q

____ originates during the initiation stage and results in multiple small fragments of tooth structure consisting of dentin, enamel, cementum, or any combination

A

Odontoma

44
Q

____ encapsulates enamel organ and turns in the PDL, cementum, and alveolar bone

A

Dental follicle (sac)

45
Q

Cell layer of the bell stage that differentiate into cementum, PDL, and alveolar bone

A

Dental sac

46
Q

During this stage, the fate of neural crest cells (mesenchyme) has yet to be fully determined

A

Pre-tooth bud stage

47
Q

Stage of tooth development that includes cellular induction

A

Initiation

48
Q

_____ indicates the lack of formation of 6 or more teeth

A

Oligodontia

49
Q

Stage of tooth development that includes proliferation, differentiation, and morphogenesis

A

Cap Stage

50
Q

____ denotes the lack of development of one or more teeth

A

Hypodontia

51
Q

____ is a defect occurring during apposition and maturation stages that results in union of root structure of 2 or more teeth by cementum

A

Concrescence

52
Q

Cell layer of the bell stage that differentiate into ameloblasts

A

Inner enamel epithelium

53
Q

____ is comprised of a conglomerate mass of enamel and dentin that bears no anatomic resemblance to a tooth; locally invasive

A

Complex odontoma

54
Q

_____ is the modification of Hertwig’s Sheath creating septa that divide the pupal tissue and create multiple roots

A

Epithelial diaphragm

55
Q

Cell layer of the bell stage that plays a supportive function; produces alkaline phosphatase to help minimize matrix

A

Stratum Intermedium

56
Q

_____ is a defect occurring during cap stage of development that results in an extra cusp due to effects on enamel organ

A

Tubercle formation

Histopathology (10 decks)

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