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Dental material > Dental pt6 > Flashcards

Dental pt6 Flashcards

1
Q

Class of impression material

A

elastic
non elasric

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2
Q

impression material non elastic ex

A

gypsum (plaster)
guttapercha
dental impression compound
waxes
ZnO eugenol

(mention impression material -> impression compound, wax, gutta percha ; think of impression non elastic -> gypsum +ZnO eugenol -> dental impression + wax +gutta percha +gypsum + Zn eugenol)

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3
Q

Impression material elastic ex

A

Hydrocolloids
Non aq elastomer

(impression elastic -> 1 is like water, 1 doesnt
-> hydrocolloids
-> non aw elastomer)

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4
Q

Classification hydrocolloids

A

reversible: agar
irreversible: alginate

(hydrocolloids -> think of water -> agar - alginate)
(agar -> edible -> reversible -> can be eaten - cen be thrown up)

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5
Q

Classification non aq elastomer

A

silicon
polyester
polysulfides

(impression non aq -> no likes water
-> boobs dont like water -> silicon
-> poly stuff - polyester, polysulfides)

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6
Q

Charac alginate

A

use for removable denture (alginate aka alternate aka removable)
water evaporates -> hardens
tear easily
unstable dimention
elastic recovery (elastic impression -> elastic recovery)
cheap

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7
Q

Charac agar

A

full mouth impression (agar -> food -> edible -> full mouth -> full mouth impression)
highly elastic, flexible (elastic impression -> elastic)
NO odor
NO toxic (food -> NO odor, NO toxic)

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8
Q

Charac Silicon

A

best detail caption
high strength
elastic
NOT rigid
expensive

(Silicon
->best type -> best detail caption
-> high strength
-> elastic
-> expensive)

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9
Q

Ways silicon poly.

A

Condensation -> ethanol by product ; setting shrinking (Add base paste + accelerator paste)
Addition - NO by product (add base paste to catalyst paste)

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10
Q

Types viscosity

A
  1. high (heavy body)
  2. medium
  3. low (light body)
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11
Q

Technique impression material

A

single mono phase impression
2 steps putty wash
1 step putty wash (double mix sandwich)

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12
Q

Steps of 2 steps putty wash tech
check again

A

try tray in mouth
adhesive to tray
isolate abudment teeth
heavy body mixing onto tray
tray in mouth - NO move
clean mouth
evaluate impression
remove undercut areas

separate trays place light body
put in mouth - NO move
clean
evaluate
disinfect

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13
Q

Charac polyether, polysulfide (elastic)

A

Polyether > good detail caption than polysulfide
Polyether > expensive than polysulfide
fixed denture
high strength
hydrophilic - can have deep mouth impression
easy remove
max 1hr until (+) impression make

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14
Q

Layers porcelain

A

Opaque layer (oxide layer) -> biscuit bake 10min
Base layer at low temp (thick, > translucent)
Incisal/Translucent (enamel like) layer for shine (glaze bake)

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15
Q

System to make porcerlain crown

A

Cerec system - scanning machine -> optical impression
Procera sys milling ceramics
CAD-CAM

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16
Q

Ad all ceramic crowns

A

stable
biocompatible
high resistant to wear, distortion
aethetics

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17
Q

Dis all ceramic crown

A

brittle
small flaws -> propagate -> create cracks

(ceramic -> easy to break -> brittle )

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18
Q

Func porcelain

A

denture teeth
porcelain enamels (cover metal cap)
all ceramic crowns (jacket crown)

(porc - aesthetics -> cover
-> cover metal cap - porc enamels
-> jacket crown - all ceramic crown)

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19
Q

All-ceramic crown

A

All ceramic crown: jacket crown
No ceramic core:
- Castable: Na2O, CaO (via lost wax process)
- Pressed glass: IPS1 (High leucite) ; IPS2 (Lithium disilicate)
Ceramic core: Milled/ CAD CA,: Al2O3 core; ZrO2 core

(No ceramic core -> can be put into oven -> castable NaCa -> Na2O, CaO)

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20
Q

Ad of glass porcelain

A

strong
aesthetic

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21
Q

Chem composition porcelain

A

SiO2
high melting point - additives -> reduce
ranges melting point

(Porce - beautiful - remsembles glass -> SiO2 -> high melting range)

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22
Q

Ranges melting point porcelain

A

High fusing - 1300
Med fusing - 1100 - 1300
Low fusing - 850 - 1100
Ultra low fusing (most preferred) - 850

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23
Q

Biocompatibility

A

interxn materials/ devices w/ body tissue, fluids

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24
Q

Stages injury

A

chemical lesion
func lesion
morphological (anatomical) lesion

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25
Q

Response to injury

A

necrosis
inflammation (immune respone)
variation of tissue - ex: dentinal tubules have local response

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26
Q

Content dentinal tubule

A

odontoblast process
serum (plasma) like material

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27
Q

Hyper sensitive pulp

A

damage to dentinal tubules, displacement serum material as effect on n. endings coming from pulp b/c external hydrostatic/ osmotic changes

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28
Q

Dentine permeability

A

diffusion thru dentinal tubules in form of fluid movement aka Convection transport
diffusion proportional to thickness dentin, size molecule transported

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29
Q

Biocompatibility test stages

A

initial
2nd
preclinical usage

30
Q

Biocompatibility initial testing

A
  1. cell planting, growth - check if material inhibits growth cells ; check if material effects activity cells by checking if reduce MTT into MTT-formazan
  2. Membrane permeability - give tryphan blue -> check health of cells. Tryphan blue enter -> aka membrane injured
  3. Agar overlay - agar covers cells stained by natural red. If cells injured -> natural red leaks
  4. Dentin barrier - thin dentin btw material, cells. Check if diffuse thru dentin -> effect cells
  5. Chemotaxic effect/ immune response - not described in ANSI/ADA
31
Q

Mutagenesis tesing (assay) use

A

ID carcinogenic materials - faster than animal testing

32
Q

Tests of mutagenesis testing

A

Ame’s test
Style’s test
Dominant lethal test
Oral, intraperitoneal LD50 test

33
Q

Ames test

A

Mutant salmonella typhimurinum
- NO live w/o exogeneous histifine
- Mutation -> mutant NO produce his again -> aka material mutagenic

(Ame -> to eat raw fish - no have salmonella -> ame: mutant salmonella typhimurinum -> NO live w/o exogeneous hist)

34
Q

Styles test

A

Fibroblast NO grown agar gel - mutated does

35
Q

Dominant lethal test

A

Spermatogenesis

36
Q

Oral and intraperitoneal LD50 test

A

mixture injected into albino mice peritoneal cavity

37
Q

2nd testing

A

aka animal testing

38
Q

2nd testing steps

A

rub material in cheek hamsters
implant material in animal -> check rxn bone, CT
put material on skin guinea pigs -> check rxn
put on healthy monkey’s teeth -> check pulp irritation in class 5 cavity
implant into bone -> check mobility radiolucency, penetration (monkey alveolar bone)

39
Q

Def corrosion

A

elements alloy ionise

40
Q

Ex corrosion

A

Cu -> ionized -> release 2e- -> Cu2+ -> leaves alloy -> effect tissue

41
Q

Compare corrosion single phase alloy, multiphase alloys

A

single phase alloys < 30X ionized mass then multiphase alloys

42
Q

Element’s liability

A

high: Cu Ni Zn Ga Cd (liability high-> ciu nho day ga ch)
medium: Ag
low: Au Pa Pl (low -> augh PaPer -> Au Pa Pl)

43
Q

Effect elements liability

A

elements effect other element’s liability
ex: Pa reduce liability Cu

44
Q

What cause increase ionized released in corrosion

A

reduced pH

45
Q

Biological rxn corrosion

A

bacterial adhesion
toxicity
subtoxic
allergy

46
Q

Clinical symptoms corrosion

A

subjective:
burning
itching
taste

objective:
inflammation
ligua geographica
ligua plicata
linchen planus

47
Q

Color def

A

light perception by Cones (eye’s receptors)

48
Q

How to perceive light

A

Rods
Cones

49
Q

Rods

A

scotopic vision - needs 1 photon (+) -> brightness

50
Q

Cones

A

Phototopic vision - needs more photons (+) -> colours

51
Q

Colours seen b/c

A

Phototopic vision - cones divided to 3 types based on light sensitivity: green red blue

52
Q

humans ID light based on

A

electromagnetic energy

53
Q

range electromagnetic energy

A

380-780nm

54
Q

Tc Color

A

black body emits colors when temp changes

55
Q

Attributes of color

A

hue
brightness
saturation

56
Q

Hue

A

degree stimulus ID as similar/diff from other stimuli chromatic/achromatic

57
Q

Saturation

A

intensity specific color (chroma) aginast gray when gray = 0 saturation

58
Q

Color adaptation

A

brains adapted to cont. stimuli same spectrum -> less sensitive

59
Q

Clinical correlations

A

teeth shads chosen while looking at gray-blue color time to time
lipstick - change perception color teeth
hospital surgeons wear green/blue -> see colours all the time -> brain > sensitive to red blood

60
Q

Colour blindness types

A

Monochromatic
Dichromatic
Abnormal trichromatic

61
Q

Monochromatic

A

0.003% female (2/3 main color NO active aka 1 active)

62
Q

Dichromatic

A

2-3% men (NO 1 main color aka 2 active)

63
Q

Abnormal trichromatic

A

5-6% all ppl (NO missing but addition in the brain NO good to 2nd colours ex: brown)

64
Q

Colour mixing use

A

create new colours

65
Q

Types mixing

A

additive
subtractibe
complex subtractive

66
Q

Additive

A

retina stimulated by 2 diff wave length -> new color born

67
Q

Subtractive

A

filt. -> light removed

68
Q

Complex subtractive

A

artistic w/ pigments

69
Q

Opaque material can

A

reflect - white reflects all color
remission - reflection in surface/ subsurface are
absorbs light (color) - black absorbs all colours

70
Q

Translucent material can

A

transmit - color pass thru

71
Q

Metamerism

A

matching color object w/ diff spectral power distribution
colour matched aka metamers

72
Q

Why metamerism occurs

A

diff type cone - response to diff cumulative E
aka diff comb light

Dental material (7 decks)

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