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DAOB > DA Exam 1 > Flashcards

DA Exam 1 Flashcards

1
Q

Primary dentition consists of how many teeth

A

20 teeth in total
10 upper
10 lower

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2
Q

Mixed dentition period is composed of both ______ and ______ teeth

A

Deciduous and permanent teeth

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3
Q

Mixed dentition period starts with the eruption of the first permanent tooth at about age _____ and ends with the loss of the last deciduous tooth at age ____

A

6
12-13

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4
Q

Permanent dentition is composed of

A

32 teeth in all
16 upper and 16 lower

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5
Q

Permanent molars, which replace nothing, are called

A

accessional teeth

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6
Q

Review this slide

A
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7
Q

Enamel is thickest at the _______

A

cusp tips

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8
Q

Enamel is extremely brittle, its hardness decreases as it approaches the ____

A

DEJ

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9
Q

What are the chemical components in enamel

A

96% hydroxyapatite
3% water
1% organic

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10
Q

Define Retzius lines

A

retzius lines reflect the appositional growth of enamel during the formation of the crown

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11
Q

In newly erupted teeth, the cervical retzius lines end at the surface in a groove called the ____

A

perikymata

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12
Q

What marks the division between enamel formed before birth and that which is produced after birth

A

the neonatal line

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13
Q

The fundamental morphologic unit of enamel is the ____

A

enamel rod

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14
Q

Each enamel rod is formed in increments by an ______

A

ameloblast

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15
Q

How do fissures form

A

they occur as the result of failure of the enamel to coalesce between developmental lobes and results in invagination of the surface

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16
Q

Define pit

A

non-coalesced enamel at the deepest point of a fossa

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17
Q

Hypermineralized zone, aprismatic enamel, strong mechanical scalloped junction

A

Dentinoenamel junction (DEJ)

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18
Q

Chemical components of dentin

A

70 % hydroxyapatite
20% type 1 collagen
10% water

19
Q

What tissue is softer than enamel but harder than bone and cementum

A

dentin

20
Q

Dentin origin

A

ectomesenchyme

21
Q

Odontoblasts have protoplasmic extensions which enter the dentine in circular channels termed ________

A

dental tubules

22
Q

Where do dental tubules have the smallest diameter and are furthest apart

A

near the DEJ

23
Q

Where do dental tubules have their largest diameter and are the closest together

A

Near the pulp

24
Q

Dentinal tubules start at right angles from the ________ and then follow an S shaped course

A

Pulp surface

25
Q

What type of dentin is the bulk of it formed in the crown and root

A

primary dentin
*has regular formation

26
Q

What type of dentin is not deposited evenly and is deposited on the pulpal surface

A

secondary dentin

27
Q

What type of dentin is deposited in localized areas beneath trauma

A

tertiary dentin

28
Q

what type of dentin is highly mineralized and composes the walls of the tubules

A

Peritubular dentin

29
Q

What type of dentin is the secretory product of the odontoblasts and consist of mostly type 1 collaged

A

intertubular dentin

30
Q

Cementum is derived from

A

ectomesenchyme

31
Q

cementum is formed by _____

A

cemntoblasts

32
Q

What is the hard dental tissue covering the anatomic roots of the teeth

A

cementum

33
Q

Excessive cementum is called

A

hypercementosis

34
Q

Chemical components of cementum

A

inorganic 45%
Organic 50%
water 5%

35
Q

What are the two kinds of cementum

A

cellular and acellular

36
Q

Cellular cementum contains entrapped cells called

A

cementocytes

37
Q

Cellular cementum is found on the _____ half of

A

apical

38
Q

Acellular cementum is found on the ______ half of the root

A

coronal half

39
Q

Define pulp chamber

A

The coronal pulp located in the anatomical crown

40
Q

Define pulp horns
Where are they located

A

projections in the roof of the pulp chamber towards the cusp tips or lobes. The pulp horns are located in the pulp chamber. More prominent in younger patients.

41
Q

Define root canal

A

the radicular pulp located in the anatomical root

42
Q

define apical foramen

A

the opening at or near the apex. This foramen is a passage way for blood or lymph vessels, nerves and connective tissue elemetns.

43
Q

Define lateral canals

A

these are branches of pulp which extend laterally

44
Q

What are maxillary canines most common morphological variations?

A

Cusp-like tubercle on cingulum

DAOB (4 decks)

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