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Dentistry Module 3 > Oral biology, enamel, dentine and bonding: oral biology lecture 1 > Flashcards

Oral biology, enamel, dentine and bonding: oral biology lecture 1 Flashcards

oral biology lecture 1

1
Q

what can over drying of the etched dentine result in

A

collapse of the collagen layer

this results in reduced bond strength

it is essential to keep it slightly wet, also called WET BONDING

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2
Q

dentine is classified as peritubular and intertubular

how is inter-tubular represented

A

is the main body of dentin, located between zone of peritubular dentin. Type 1 collagen present in this region.

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3
Q

what is the name of the condition, where incremental lines appear on the surface of the tooth enamel, as a series of linear growth

A

perikymata

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4
Q

what does this image represent

A

hydroxyapatite

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5
Q

when would the Striae of Retzius appear as concentric circles

A

in a cross section

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6
Q

where would you find specialised connective tissue

A

dentine

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7
Q

what is the function of odontoblast found on the outer surface of the dental pulp

A

dentinogensis = formation of dentin

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8
Q

in the enamel prism where would you find tightly packed hydroxyapatite crystals

A

prism core

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9
Q

what can be determined from the striae of retzius

A

indicates enamel development, the lines indicate weekly growth.

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10
Q

which zone sits between the cell rich zone and the predentine

A

cell free zone of weil

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11
Q

dentine can be classified as primary, secondary and tertiary dentine

what is tertiary dentine

A

tertiary dentin is reactive dentine, this is localised formation of dentin on the pulp-dentin border, formed in reaction to trauma such as caries or restorative procedure.

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12
Q

which part of the tooth is comprised of 70% mineral and 20% organic collagen

A

dentine

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13
Q

which of the following mechnaisms of tertiary dentine responds the quickest to trauma

A

reparative - quickest

reactionary - slow formation

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14
Q

what is occuring at the body of lesion

A
  • The largest part and centre of lesion
  • 25-50% porosity
  • Enamel is relatively translucent
  • Striae of Retzius more obvious
  • Corresponds to the radiographic appearance
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15
Q

what is occurin on the surface zone

A
  • Relatively intact
  • 30 um thick
  • Highly mineralised – high fluorine content
  • Porosity of 1-2%
  • Forms/reforms during carious process
  • Redeposition of mineral dissolved from deeper layers
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16
Q

(KHN 360-390)

which part of the tooth represents that figure

A

enamel

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17
Q

what is a white spot lesion

A

enamel caries

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18
Q

what is in dental tubules

A

depending on the location of the cross section of the dentinal tubules. different contents are found.

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19
Q

developmental dentine is broken down to 2 components mantle and circumpulpal dentine:

where is circumpulpal dentine located.

A

(Circumpulpal dentin, more mineralized dentin which makes up most of the dentin layer and is secreted after the mantle dentin by the odontoblasts)

in other words makes up most of the dentine

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20
Q

what is referred as a keyhole shape

A

enamel prism

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21
Q

what is aprismatic enamel

A

Aprismatic enamel is a thin surface layer of the tooth, thought to be solid without individual enamel rods or prisms.

  • Surface of Aprismatic layer is 30um
  • Apatite crystals parallel and tightly packed
  • Essentially no sheath like enamel
  • High fluoride content (more acid resistant)
  • More difficult to achieve optimal etch
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22
Q

where is the most mineralised tissue located in a tooth.

enamel

dentine

cementum

bone

A
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23
Q

dentine can be classified as primary, secondary and tertiary dentine

what is secondary dentine

A

(it develops after root formation has been completed and representing the continuing but much slower, deposition of dentin by odontoblast. The ratio of mineral to organic material is the same as for primary dentin)

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24
Q

developmental dentine is broken down to 2 components mantle and circumpulpal dentine:

where is mantle dentine located.

A

(The outer layer closest to enamel is known as mantle dentin. … Mantle dentin is formed by newly differentiated odontoblasts and forms a layer consistently 15-20 micrometres (µm) wide)

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25
Q

what is a smear layer

A

The smear layer is a layer of microcrystalline and organic particle debris that is found spread on root canal walls after root canal instrumentation.

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26
Q

which of the following region of the tooth has the most water region

dentine

enamel

cementum

bone

A

water

27
Q

what is occuring in the translucent zone

A
  • 1st carious change
  • Loss of 1-2% mineral
  • 50% of cases
28
Q

which cell is of neural crest origin

A

odontoblast

29
Q
A
30
Q

what is the function of the hybrid layer placed after acid conditioning

A

: a hybrid layer is placed on the exposed collagen. They hybrid layer is a resin which consists of a collagen network. The layer is an interface between dentin and adhesive resin.

31
Q

what is the purpose of acid etch

A

These acids have an etching effect that causes surface roughening

32
Q

The dentine is present with dentine tubules inside, these tubules have curvatures, in the form of?

A

primary and secondary curvatures

33
Q

what is the name of the incremental lines present on the enamel

A

Striae of Retziius

34
Q

what does this structure form

A

enamel prisms

35
Q

the direction of the collagen fibres present in the dentine follow the shape of what

A

they follow the shape of the ADJ

this gives the dentine reinforced strength

36
Q

which of the following region of the tooth has the second most mineralised region

dentine

enamel

cementum

bone

A
37
Q

what is indicated on the cuspal region of the histology

A

gnarled enamel

38
Q

what supportive feature does the gnarled enamel provide

A

increase in strength

39
Q

are enamel tufts hypomineralised or hypermineralised

A

hypomineralised

40
Q

what is a ground section of a tooth

A
  • A section of bone or tooth prepared for histological study by polishing until thin enough for microscope viewing
41
Q

which two cells are found in the cell rich zone

A

odontoblasts and fibroblasts

42
Q

give an example of an an epithelical product

A

the enamel

43
Q

what is occuring in the dark zone

A
  • Dark brown with quinoline
  • Seen in 90-95% of lesions
  • Porosity now 5-10%
  • Consists of large pores and small pores
  • In the dark zone – demineralisation and remineralisation occurring
44
Q

sclerosis of the dentine is a result of dental insult.

what happens to the tubules during sclerosis

A

tubules blocked off

appears transparent

45
Q

where would you expect to find the greatest concentration of nerves in tubules

A

pulp horn - greatest concentration

cervical margin - 7%

root <7%

46
Q

The enamel structure contains tightly packed hydroxyapatite crystals

A basic unit =

A

enamel prism or rod

47
Q

when would the Striae of Retzius appear as dark bands

A

in a longitudinal section

48
Q

is the enamel vital or non vital

A

non vital

49
Q

mantle and circumpalpal dentine can be classified as?

A

primary dentine

50
Q

which of the following region of the tooth has the second least mineralised region

dentine

enamel

cementum

bone

A
51
Q

which of the following region of the tooth has the second most water region

dentine

enamel

cementum

bone

A

cementum

52
Q

which of the following mechnaisms of tertiary dentine responds by destroying odontoblast and recurits newly differentiated “odontoblast” for repair

A

reparative

53
Q

tertiary dentine repairs through two mechanisms what are they

A

reactionary and reparative

54
Q

dentine is classified as peritubular and intertubular

how is peritubular represented

A

peritubular/intratubular are represented by tubules in the dentine. no collagen present in the tubules

55
Q

dentine can be classified as primary, secondary and tertiary dentine

what is primary dentine

A

it is the dentin formed before complete root formation. Most of the tooth formed by primary dentin which outlines the pulp chamber

56
Q

KHN 75

which part of the tooth represents this figure

A

dentine

57
Q

which of the following mechnaisms of tertiary dentine responds by using existing odontoblast for repair

A

reactionary

58
Q

what are enamel spindles

A

dentinal tubules in enamel

59
Q

what is the definition given when something has a smoothly rising and falling form or outline

A

undulating

60
Q

with the removal of the smear layer and the process of demineralisation has exposed what?

A

collagen

61
Q

where would you expect to find the greates concentration of dentinal tubules?

Amelodentinal Junction or Predentine

A

predentine

62
Q

where would you find in the enamel prism, less tightly packed

A

prism sheath

63
Q

how is micromechanical retention achieved

A

the use of acid etch to cause prisms forming

64
Q

where would you find the most organic components in a enamel prism

A

prism sheath - lless tightly packed

Dentistry Module 3 (33 decks)

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