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indirect Restoration > Quiz 2/9 Try-In and Cementation > Flashcards

Quiz 2/9 Try-In and Cementation Flashcards

1
Q

tool to remove interim:

A

Bachhous forceps, hemostat

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2
Q

Try-IN procedure for cast metal resto

A

proximal contact, marginal integrity, stability, occlusion

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3
Q

Most common issue with proximal contact:

A

too tight

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4
Q

How to jude tightness of contacts:

A

compare to other teeth in mouth

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5
Q

TF? Pt response is sufficient to confirm a tight contact.

A

T

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6
Q

How to correct proximal contacts:

A

CCC - rubber wheel, porcelain: - cylindrical mounted stone

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7
Q

How to correct contact in a gold casting:

A

soldering

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8
Q

Clinically acceptable gap for marginal adaptation:

A

30um

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9
Q

How to assess marginal integrity:

A

sharp explorer - tooth to resto, open margin = 50um the tip of sharp explorer can be inserted bw the resto and tooth

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10
Q

Materials to test whether the casting binds the tooth surface:

A

disclosing wax, suspension of rouge in chloroform or ether (PIP), air abrasion to form a matte finish, powdered sprays, water soluble marking agents, elastomeric detection paste

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11
Q

most reliable fit checker:

A

elastomeric detection paste

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12
Q

Can instability produces by a small pos odue be corrected?

A

yes, trimming

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13
Q

How to fix instability due to distorted wax pattern:

A

repeat

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14
Q

Width of braze gap:

A

0.25mm

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15
Q

What shape should sectioned pieces have?

A

flat, parallel

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16
Q

Use this to conect the two sectioned pieces of bridge:

A

GC pattern resin

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17
Q

Name of procedure adhering part of bridge together:

A

indexing

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18
Q

How to check for stability of indexed assembly:

A

no rocking, satisfactory margin adaptation

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19
Q

Do this before sending to lab for soldering:

A

GC pattern Resin (not over margin!)

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20
Q

Look for these esthetic issues in a ceramic resto:

A

enamel cracks, stained crack lines, exposed occlusal dentin, incisal halo

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21
Q

Ideal luting agents:

A

long working time, adhere to both, good seal, non-irritatin, non-toxic, adequate strength, compressible to thin layers, low viscocity, low solubility, good working and setting characteristics, easily removed, F release

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22
Q

Types of luting agents:

A

zinc phosphate, zinc silicophosphate, zinc polycarboxylate, xinc oxide-eugenol w/ wo EBA, GI, adhesive resins, resin modified GI’s

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23
Q

Cement bonding agents:

A

non-adhesive, micro-mechanical, molecular

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24
Q

Zinc phosphate cement is made of:

A

ZnO powder and phosphoric acid

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25
Q

Adv’s of since phosphate cement:

A

good track record of success, high stability of specimens older than 40yo, adequate strength, reasonable working time, excess material easily removed

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26
Q

Disadv’s of zinc phosphate cement:

A

water sensitive during setting, microleakage, high solubility esp. in acidic env, pulp irritation, low initial pH, lack of antimicrobial action, brittleness, lack of adhesion

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27
Q

Zinc silicophosphate:

A

high compressive strength, moderate tensile strength, excessive film thickness 88um at the occlusal surface under an actual casting, acid pH - may harm pulp

28
Q

Zinc Polycarboxylate cement:

A

Powder: zjnc oxide w 1% to 5% tin or Mg oxide, 10% to 40% Al oxide or other reinforcing filler, the acid 40% (high MW) polyacrylic acid or acrylic acid copolymer w other organic acids.

29
Q

Zinc Polycarboxylate cement is good for cementing:

A

crowns and 3-unit bridges (3ub)

30
Q

Adv of Zinc Polycarboxylate cement::

A

low adhesion to tooth, chelates w Ca, adhesion to some alloys, higher tensile strength compared to zinc phosphate cement (lower compressive strength), anticariogenic (less than GIC), biocompatible w pulp, rapid rise of cement pH toward neutrality, little post-op sensitivity, film thickness comparative to those of zinc phosphate cements, solubility in distilled water

31
Q

Disadv to Zinc Polycarboxylate cement:

A

lower compressive strength that zinc phosphate cement

32
Q

Which is more anticariogenic, Zinc polycarboxylates cement or GI?

A

GI

33
Q

DIsadv to zinc polycarbocyalet cement:

A

thixotrpoic, (too thick, willnot low), short working time compareed to Zn/Po cement, difficult to lute long span bridges, residula cement more difficul tto remove, weaker that Zn/Po, plastic deformation, unsuitable to high load areas

34
Q

Mix Zinc Polycarboxylate cement on:

A

glass slab, so it doesn’t lose water, don’t extrude early or it will lose water

35
Q

To inc setting time of Zinc Polycarboxylate cement:

A

cool glass slab and stainless steel spatula

36
Q

Zinc Polycarboxylate cement should not be disturbed in this stage::

A

rubbery, will pull from the margins

37
Q

Composition of GI cement:

A

alumino-fluorosilicate glass + weak polyacrylic acids

38
Q

Effect of early water exposure on GI cement:

A

sig recuctino in ultimate strength

39
Q

Properties of GI cement

A

low cement film thicknesss (25-35um), doesn’t appear to more irritant to pulp

40
Q

Adv’s of GI cement:

A

adheres to both enamel and dentin, low bond strength to teeth, biocompatible, no pulp protectin required, F release, anticariogenic, easy to mix, resistant to acid dissolution, set cement is translucent (good for using porcelain labial margin), mechanical props comparable w zinc phosphate cement (comparative compressive strength

41
Q

GI disadv’s:

A

long term sensitivity if tooth over dired, highly susceptible to moisture contamination during setting, slow set, possible pulp irritation, variable adhesive characteristic, residual cement more difficult to remove

42
Q

Hybrid ionomer cements:

A

resin modified polyalkenoate cement (resin + GI powder), combines strength and insolubility of resin w the F release of GI, recmmend use for all-metal or ceramo-meatl crowns and bridges, not posts (risk fo expansion induced root fracture), not recommneded for all-ceramic restos (delayed expansion, ceramic fracture), workign time lengthened by cooling liquid, mixing on cool slab or dec P/L ratio, inc temp - dec workign time., microetchingt o prepare internal metal surfaces for inc bonding, remove excess cement before final set, use desnsitizing liquid to red sensitivity wo major effect on bond to tooth

43
Q

Composition of adhesive resin agents;

A

Bis-GMA resins and other methacrylates

44
Q

adhesive resin agents can be categorized by:

A

chemical-, photo-, and dual cure

45
Q

How does adhesive resin agents adhere to enamel and dentin?

A

micromechanical, penetration of hydorphilic monomers through collagen layer overlying partially demineralized apatiite o etched dentin

46
Q

Function of conditioner of adhesive resin agents

A

remove smear layer, demineralize top 2-5um

47
Q

Primer used for adhesive resin agents:

A

wetting agents such as HEMA applied, enables philic bond to dentin and phobic bond to ashesive

48
Q

Adhesive cemetn that penetrates into tubules:

A

4-META

49
Q

Provblem w adhesive resin agents:

A

polymerization shrinkage

50
Q

Can cement change shade of veneer?

A

yes

51
Q

These pastes can facilitate selecting the best cement shade:

A

colour matching try-in paste

52
Q

Adv’s of adhesive resin agents:

A

high strength, low oral solubiility, high micromechanical bonding to prepped enamel, dentin, alloys and ceramic surfaces

53
Q

Disadv’s of adhesive resin agents:

A

meticulous/ critical technique, difficult sealing and higher film thickness than most cements, possible leakage and pulp sensitivity, tought to remove excess cement

54
Q

Provisional cement we use:

A

ZOE

55
Q

Powder portion of ZOE:

A

sinc oxide

56
Q

Liquid portion of ZOE:

A

eugenol

57
Q

Film thickness needed for ZOE:

A

40um

58
Q

TF? ZOE is highly anticariogenic.

A

F. slightly

59
Q

ZOE, highly soluble?

A

yes, 1.5%

60
Q

how to reinforce ZOE cements:

A

add EBA, aluminaum oxide and PMM

61
Q

ZOE has this effect on pulp

A

Abtudent, good sealing ability and resistance to marginal penetration

62
Q

Purpose of luting cement:

A

seal tooth-restoration interface space

63
Q

What does the choice of definitive cement depend upon?

A

conventional casting resto ro adhesive restoration

64
Q

TF? Both zinc phosphate and resin bond to tooth.

A

F. zinc phosphate does not

65
Q

Longer working time, inc phosphate or resin bond

A

sinc phosphate

indirect Restoration (54 decks)

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