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Dentistry BDS4 > DMS > Flashcards

DMS Flashcards

1
Q

Name 4 metallic post materials and 4 non metallic post materials

A

type IV gold
titanium
cobalt chromium
stainless steel

glass fibre
carbon fibre
zirconia
fibre reinforced resins

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2
Q

Name additives to gutta percha

A

zinc oxide as a filler
waxes as plasticisers
barium as a radiopacifier

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3
Q

What luting cements can be used for a MCC?

A 
glass ionomer
RMGI
composite resin cement
zinc phosphate
poly carboxylate
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4
Q

How would you remove a post?

A

ultrasonic tips to disrupt the luting cement
masseran kits to make a gully around the post
rotosonic tips to disrupt the cement

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5
Q

What are additives in amalgam and what are they for?

A

Copper - reduces tarnishing and strengthens

zinc - oxygen scavenger

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6
Q

How can you reduce marginal leakage in amalgam restorations?

A 
conventional cavity varnish (copalite)
bonding agent (panavia)
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7
Q

What are some constituents of composite?

A

Resin - Bis-GMA
filler - quartz
activator - benzoyl peroxide

(compressive strength, abrasion resistance, thermal expansion and setting contraction, aesthetic qualities are defined by filler)

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8
Q

What are some different types of composites?

A

macrofilled - good mech, poor aesthetics
microfilled - good aesthetics, poor mechs
nanofilled - good aesthetics, good wear
hybrid - good mechs, good aesthetics

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9
Q

How would you finish a composite?

A

microfine diamond bur and under water spray to get gross anatomy and finishing
finishing strips for interdentally
aluminioum oxide coated discs (Sof-Lex)

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10
Q

What are different dentine bonding agent techniques?

A

etch/rinse

  1. Three step - acid etch, prime, bond all separate
  2. two step - acid etch, prime/bond

Self etching

  1. two step - acid etch, bond
  2. one step - acid etch/primer/bond - good for kids
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11
Q

how would you bond to a metal indirect restoration?

A

sandblast metal surface (micromechanical retention), 4-META conditioner, composite luting agent

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12
Q

How woul dyou bond to a ceramic indirect restoration?

A

etch, silanate, and luting agent

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13
Q

What are uses of glass ionomers?

A
  1. luting cements (crowns/bridges/ortho bands)
  2. restorative cements
  3. liners under restorations
  4. light cure/dual cure
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14
Q

What is the setting reaction of GI?

A

base + polyacid –> poly salt + water

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15
Q

What aesthetic restorative materials are there?

A

composite
GI
RMGI
compomer (F-release of GI, wear resistance of comp)
giomers - comp resin, active GI particles
ceromers - indirect comp resin. high filler content

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16
Q

What cement would you use for a temporary restoration?

A

ZOE/resin bonded ZOE, GI (seals prep margins)

17
Q

What cement would you use as a luting agent?

A

zinc phosphate
GI
polycarboxylate
composite based luting systems

18
Q

What cement would you use as a liner?

A

RMGIC

composite resin

19
Q

What would you use as a pulp cap?

A

hard setting CaOh or MTA

20
Q

What is used as a sedative dressing?

A

ZOE (kalzinol, or coltisol for E free)

CaOH

21
Q

what would you use for a bacteriostatic dressing?

A

CaOH sealed in with GI

22
Q

List different elastomeric impression compounds

A

condensation cured silicone
addition cured silicone
poly sulfides
poly ether

23
Q

List the hydrocolloid impression materials

A

Agar

alginate

24
Q

What is alginate?

A

irreversible hydrocolloid impression material.
setting reaction of sodium alginate with calcium sulphate

Na alg + CaSO

25
Q

What do you use to modify a stock tray?

A

Impression compound

26
Q

What causes finning during casting?

A

cracks in the investment material

27
Q

What are different components of PMMA?

A

PMMA beads, initiator (benzoyl peroxide), methacrylate monomer, cross linking agent, inhibitor (hydroquinone)

28
Q

When would you use a tissue conditioner?

A

when relining a denture after implant placement for reduced pressure during osseeointegration

29
Q

How does Zinc affect the setting of amalgam?

A

oxygen scavenger, causes delayed expansion
reduces creep and ditching
if exposed to water will release H2 bubbles and can cause pain

Dentistry BDS4 (20 decks)

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