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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
Response to injury
necrosis inflammation (immune respone) variation of tissue - ex: dentinal tubules have local response
26
Content dentinal tubule
odontoblast process serum (plasma) like material
27
Hyper sensitive pulp
damage to dentinal tubules, displacement serum material as effect on n. endings coming from pulp b/c external hydrostatic/ osmotic changes
28
Dentine permeability
diffusion thru dentinal tubules in form of fluid movement aka Convection transport diffusion proportional to thickness dentin, size molecule transported
29
Biocompatibility test stages
initial 2nd preclinical usage
30
Biocompatibility initial testing
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
Mutagenesis tesing (assay) use
ID carcinogenic materials - faster than animal testing
32
Tests of mutagenesis testing
Ame's test Style's test Dominant lethal test Oral, intraperitoneal LD50 test
33
Ames test
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
Styles test
Fibroblast NO grown agar gel - mutated does
35
Dominant lethal test
Spermatogenesis
36
Oral and intraperitoneal LD50 test
mixture injected into albino mice peritoneal cavity
37
2nd testing
aka animal testing
38
2nd testing steps
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
Def corrosion
elements alloy ionise
40
Ex corrosion
Cu -> ionized -> release 2e- -> Cu2+ -> leaves alloy -> effect tissue
41
Compare corrosion single phase alloy, multiphase alloys
single phase alloys < 30X ionized mass then multiphase alloys
42
Element's liability
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
Effect elements liability
elements effect other element's liability ex: Pa reduce liability Cu
44
What cause increase ionized released in corrosion
reduced pH
45
Biological rxn corrosion
bacterial adhesion toxicity subtoxic allergy
46
Clinical symptoms corrosion
subjective: burning itching taste objective: inflammation ligua geographica ligua plicata linchen planus
47
Color def
light perception by Cones (eye's receptors)
48
How to perceive light
Rods Cones
49
Rods
scotopic vision - needs 1 photon (+) -> brightness
50
Cones
Phototopic vision - needs more photons (+) -> colours
51
Colours seen b/c
Phototopic vision - cones divided to 3 types based on light sensitivity: green red blue
52
humans ID light based on
electromagnetic energy
53
range electromagnetic energy
380-780nm
54
Tc Color
black body emits colors when temp changes
55
Attributes of color
hue brightness saturation
56
Hue
degree stimulus ID as similar/diff from other stimuli chromatic/achromatic
57
Saturation
intensity specific color (chroma) aginast gray when gray = 0 saturation
58
Color adaptation
brains adapted to cont. stimuli same spectrum -> less sensitive
59
Clinical correlations
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
Colour blindness types
Monochromatic Dichromatic Abnormal trichromatic
61
Monochromatic
0.003% female (2/3 main color NO active aka 1 active)
62
Dichromatic
2-3% men (NO 1 main color aka 2 active)
63
Abnormal trichromatic
5-6% all ppl (NO missing but addition in the brain NO good to 2nd colours ex: brown)
64
Colour mixing use
create new colours
65
Types mixing
additive subtractibe complex subtractive
66
Additive
retina stimulated by 2 diff wave length -> new color born
67
Subtractive
filt. -> light removed
68
Complex subtractive
artistic w/ pigments
69
Opaque material can
reflect - white reflects all color remission - reflection in surface/ subsurface are absorbs light (color) - black absorbs all colours
70
Translucent material can
transmit - color pass thru
71
Metamerism
matching color object w/ diff spectral power distribution colour matched aka metamers
72
Why metamerism occurs
diff type cone - response to diff cumulative E aka diff comb light

Dental material (7 decks)

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