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oral cavity - BDS 1 > basic tooth and periodontium :) > Flashcards

basic tooth and periodontium :) Flashcards

1
Q

what is the cervix of the tooth

A

where the crown joints the root

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2
Q

what is the bottom point of the tooth

A

apex

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3
Q

what is the clinical crown

A

crown seen in paitents mouth

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4
Q

what is the anatomical crown

A

entire crown

gingivae overlines the cervix of the tooth

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5
Q

what is enamel

A

layer of tissue which covers the anatomical crown of tooth

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6
Q

what is enamel derived from

A

ectoderm cells

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7
Q

what is enamel when fully formed

A

non vital acellular so cannot be repaired

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8
Q

what runs through enamel tissue

A

enamel rods/prisms

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9
Q

how is enamel deposited

A

increments

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10
Q

what is dentine derived frm

A

ecomesenchyme

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11
Q

mineralisation of dentine and enamel

A

dentine 70

enamel 96

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12
Q

is dentine living or non living

A

living

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13
Q

properties of dentine

A

compressive and tensile strength

acts as a cushion for enamel

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14
Q

what are found within the dentine

A

dentine tubules

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15
Q

what do dentine tubles contain

A

odontoblast cell processes extending from odontoblast cell bodies

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16
Q

where do odontonblasts cell bodies lie

A

pulp dentine boundary

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17
Q

where is dentine laid down around

A

around the tubules

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18
Q

what happens to the odontoblasts in the dentine

A

remain on pulp dentine boundary in quiesent state

can be reactivated to produce new dentine

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19
Q

what is the pulp

A

centre of the tooth

20
Q

what is the pulp derived from

A

ectomesechyme

21
Q

describe the pulp

A

soft vital connective tissue
odontoblast cells line the outside of the pulp
occupies pulp chamber in crown and root canals

22
Q

what covers the tooth root

A

cementum

23
Q

what is cementum derived from

A

ectomesenchyme

24
Q

mineralisation of cementum

A

55% mineral

25
Q

where is acellular cementum

A

towards the crown of the tooth

26
Q

where is cellular cementum

A

towards the apex of teh tooth

27
Q

what is found in cellular cementum

A

cementocytes in lacunae

28
Q

name the periodontal tissues

A

periodontal ligament
alveolar bone
gingiva

29
Q

what is PDL derived from

A

ectomesenchyme

30
Q

what is the alveolar bone

A

part of mandible and maxilla which supports the tooth roots and creaes the tooth socket

31
Q

what does the alveolar bone do

A

form anchor for PDL fibres

32
Q

what does alveolar bone respond to

A

loading

33
Q

gingivae in health

A

pale pink
thick
keratinised
adjacent to cervix of tooth

34
Q

oral mucosa in health

A

red
lines oral cavity
stretches
found in low abrasion areas

35
Q

type of epithelium of gingivae

A

stratified sqamous keratinised

36
Q

purpose of gingivae

A

form protective region where teeth pierce epithelium

37
Q

oral mucosa epithelium

A

stratified squamous

can be keratinised

38
Q

dentition types for humans

A

primary

permanent

39
Q

how many teeth in primary

A 
20
2 incisors
1 canine
2 molars 
ABCDE
40
Q

Permanent dentition

A

16 teeth

41
Q

quadrants for permanent/primary

A

1-4

5-8

42
Q

what does the PDL do

A

connects cementum of tooth to the

  • alveolar bone
  • adjacent teeth
  • gingivae
43
Q

why do fibres go in different directions

A

supports the root of the tooth within the socket

help bring the tooth back uo after pressure is allied

44
Q

what reforms during orthodontic treatment

A

PDL (apart from the end inserted into the cementum as the cementum doesnt remodel)

45
Q

composition of the PDL

A

dense fibrous tissue
collagen with formative fibroblasts interspersed, neurovaualr bundles
- arranged in different orientations to absorb masticatory load

46
Q

types of forces applied to the tooth

A

axially (down towards the apex)
rotational
tiliting

oral cavity - BDS 1 (66 decks)

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