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DMS > DMS Summary > Flashcards

DMS Summary Flashcards

1
Q

What are the principles of cavity prep (6)

A
  1. Identify and remove carious enamel
  2. Identify max extent at ACJ
  3. Remove peripheral caries then circumferentially deeper
  4. Remove deeper caries over the pulp
  5. Outline form modification
  6. Internal design modification
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2
Q

Name some advantages of composite (5)

A
  • Aesthetics
  • Bond to tooth
  • Command set
  • Conserves tooth tissue
  • Low thermal conductivity
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3
Q

What is the c factor

A

Ratio of bonded to unbonded SA

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4
Q

List some properties of composite

A

Radiopaque
Low setting shrinkage
Low thermal conductivity
Bonds to tooth
Biocompatible
High strength

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5
Q

What is composite composed of?

A

Filler - glass quartz

Resin - bis GMA

Photoinitiator - campherquinone

Low weight dimethacrylate - TEGDMA

Silane coupling agent

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6
Q

Different types of filler particles (3)

A

Conventional
Hybrid
Microfine

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7
Q

Function of resin bisgma

A

Undergoes free radical addition polymerisation

Difunctional molecule to allow c=c cross linking

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8
Q

Function of initiator

A

Produces free radicals

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9
Q

Function of silane coupling agent

A

Allows glass to bond to resin
Methoxy group reacts with absorbed water

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10
Q

Clinical factors that affect wear of composite (5)

A

Placement
Curing
Finishing
Occlusion
Cavity size + design

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11
Q

What is amalgam made of?

A

Liquid - mercury

Powder - copper, silver, tin, zinc

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12
Q

What are the types of particles in amalgam?

A

Lathe cut
Spherical

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13
Q

Setting reaction for amalgam

A

Powder + liquid –> unreacted particles + amalgam matrix

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14
Q

Unreacted zinc potential issues

A

Reacts with saliva/blood

Forms zinc oxide + H bubbles = increased pressure expansion of AM

or

decreased pressure = pulpal pain

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15
Q

List some properties of amalgam

A

High thermal conductivity
Corrosion
Longer handling
Not moisture sensitive
Cheaper
Worse aesthetics
Mercury toxicity
Mechanical retention required

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16
Q

Constituents of GI (2)

A

Powder
- Silica
- Alumina

Liquid
-Polyacrylic acid
- Tartaric acid

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17
Q

3 phases of the acid/base setting reaction for GI

A
  1. Dissolution
  2. Gelation
  3. Hardening
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18
Q

What happens at dissolution phase?

A

H ions diffuse into glass

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19
Q

What happens at gelation phase?

A

Ca ions crosslink
Initial set of GI

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20
Q

What happens at hardening phase?

A

Continued cross linking

Can last 7 days

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21
Q

What can happen if there is contamination during setting?

A

Al ions diffuse out material
Water absorbed from saliva/blood

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22
Q

Constituents of RMGI

A

Powder (barium glass)
Liquid (HEMA, tartaric acid, polyacreyic acid, photo initiator)

23
Q

Setting reaction for RMGI

A

Dual curing - acid base
Tri curing - redox

24
Q

Name 3 examples of liners

A

CaOH

ZOE

RMZOE

25
Q

How does CaOH work to protect pulp

A

Bacteriocidal (alkaline)
Imitates odontoblast layer
–> necrosis
–> forms tertiary dentine to protect pulp

26
Q

When to not use ZOE

A

Do not use under composite
Inhibits resin set

27
Q

List some properties of acrylic (denture base)

A

Dimensionally accurate
High thermal conductivity
Non toxic
Non irritant
Poor mechanical strength

28
Q

2 types of PMMA

A

Self cure - URA
Decreased fracture resistance

Light cure - Denture
Increased fracture resistance

29
Q

List some ideal properties of a denture base (7)

A

Aesthetics
Cost effective
Non toxic/irritant
Low weight
Dimensionally stable
High thermal conductivity
Flexural strength

30
Q

Consistuents of PMMA (2)

A

Powder - PMMA, plasticiser

Liquid - methacrylate, inhibitor

31
Q

Faults during production of PMMA (acrylic)

A

Contraction porosity

Gaseous porosity

Granular

Crazing

32
Q

How do we bond to enamel?

A

Enamel = hydrophobic + high surface energy

37% phosphoric to roughen enamel + allow micro mechanical interlocking of resin fillers

Improves wettability

Removes contaminants

33
Q

How do we bond to dentine?

A

Dentine = hydrophilic + low surface energy

Dentine conditioner
- Etches dentine
- Opens up dentinal tubules and removes smear layer

Primer
- HEMA/MDP, 4META = coupling agents
- Bifunctional with hydrophobic + hydrophilic ends

Adhesive
- Mix of bisGMA+HEMA forms hybrid layer

34
Q

Give examples of non elastic impression materials

A

ZOE
Impression compound

35
Q

Give examples of elastic impression materials

A

Hydrocolloid
Alginate + agar
Silicones
Polyether

36
Q

Give examples of elastomer impression materials

A

Polyether + silicones

37
Q

Definition of an elastic impression material

A

Records undercuts
Elastic strain + elastic recovery

38
Q

Definition of a non elastic impression material

A

Can’t record undercuts is rigid

39
Q

Definition of mucostatic material

A

Fluid material that displaces soft tissues slightly and gives impression of undisplaced mucosa

40
Q

Definition of a mucocompressive material

A

Viscous material that records impression under load + takes impression of displaced tissues

41
Q

Ideal properties of an impression material

A
  • Biocompatible
  • Non toxic/irritant
  • No thermal contraction
  • Operator convenient
  • 100% elastic recovery
  • Unaffected by moisture
42
Q

What type of material is alginate?

A

Elastic hyodrocolloid

43
Q

Constituents of alginate

A

Sodium alginate
Silicate powder
Calcium phosphate

44
Q

Advantages of alginate

A

Sets fast
Cheap
Adequate surface detail

45
Q

Disadvantages of alginate

A

Poor dimensional stability
Distortion
Operator dependent
3mm thickness required

46
Q

What type of material is impression compound?

A

Non elastic mucocompressive

47
Q

Advantages of impression compound

A

Mucocompressive
Good for edentulous
Can alter set

48
Q

Disadvatanges of impression compound

A

Mucocompressive - avoid in flabby ridge
Rigid
Poor dimensional stability

49
Q

What type of material is polyether?

A

Elastic elastomer - Impregum

50
Q

Advantages of polyether

A

Hydrophilic - good for poor moisture control Dimensionally stable

51
Q

Disadvantages of polyether

A

Rigid when set - not for undercuts
Difficult to remove
Absorbs water

52
Q

When are light + medium bodied silicones used?

A

Crowns bridges dentures

53
Q

Disadvantage of silicone

A

Hydrophobic

DMS (1 decks)

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