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IODC - IRS > Cementation > Flashcards

Cementation Flashcards

1
Q

What are the 3 classifications of cements?

A
  1. Liners and bases
  2. Temporary cements
  3. Permanent cements
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2
Q

Example liner/ bases?

A

Glass ionomer cement

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3
Q

Properties of RMGIC

A
  1. Ease of use/ bulk fill
  2. Command set w/ light cure
  3. Possibility of subsequent etching to establish strong adhesive bond w/ dentine bonding agent
  4. Adhere to unetched hard tissue
  5. Sustained F- release
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4
Q

What must temporary cements be able to do?

A

Must remain cemented between prep and definitive restoration for 1 week - several months
Sometime necessary long term provisionals - assess pulp health, gingival health and evaluation aesthetic and function

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5
Q

What can the loss/ failure of temporary cement lead to?

A

Pain
Overeruption - loss of space
Drifting proximal teeth
Damage to core prep

PODD

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6
Q

What are the ideal functions of temporary cement?

A

Provide seal - protect marginal leakage
Prevent plural irritation
Low strength - easy to remove
Protect prep

SPSP

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7
Q

Ideal properties of temporary cement?

A 
Seal against oral fluids
Low solubility
Biocompatible  
Chemical compatibility w/ provisional
Ease of use/ ease of removal
Easy eliminate excess
Adequate working and setting

E-CABLES

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8
Q

What materials are used as temporary cement?

A

Fine particle zinc oxide eugenol cement = TempBond

Non-eugenol cement = TempBond NE

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9
Q

What materials should not be used as temporary cement?

A

Zinc phosphate, zinc polycarboxylate, GIC

Too high strength

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10
Q

What are the adv/ disadv of ZoE cements?

A

Adv
- Easy removal, acceptable sealing, obtundent effect pulp, easy use

Disadv

  • Free eugenol act as plasticiser of methacrylate resin - reduce surface hardness and strength
  • Eugenol interfere w/ bond strength resin cement - inhibit polymerisation
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11
Q

What is purpose of permanent cement?

A

Fill micro gap between tooth structure and restorative material to assist in retention

  • Proper resistance and retention from preparation is most important for successful retention
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12
Q

Types of permanent cement?

A
  1. Total etch adhesive resin cements: self cured resin, light cured resin, dual cured resin
  2. Self etching resin cements
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13
Q

Properties of ideal cement?

A 
Adequate working time - rapid set
Low film thickness
Low solubility
High compressive and tensile strength 
Low viscosity
Adhesion to tooth and restorative material
Biocompatible
Cariostatic
Translucent or opaque 
Radiopaque

CRAVATS CBF

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14
Q

What is RMGIC?

A

Hybrid resin and GIC
Insoluble oral fluid
Bond inorganic phase dentine

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15
Q

Disadv of using RM-GIC as permanent cement?

A

Adhesion to tooth or ceramic not as strong

Hydroscopic expansion can lead to fracture of ceramic - contraindicated w/ ceramic

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16
Q

When is it acceptable to use RM-GIC as permanent cement?

A

Metal-based inlay, onlay, crowns or bridges

17
Q

Mechanism of RM-GIC?

A

Contain acid-soluble glass, poly acid polymer and polymerising dimethacrylate

Polyacid polymer react w/ calcium in glass filler and dentine
Dimethacrylate polymerise into solid resin

18
Q

Composition and setting of RMGIC?

A

Powder - ion leachable glass
Liquid - bisGMA enable polymerisation reaction, poly acid reacts powder acid-base reaction, HEMA enable resin and acid to co-exist in solution, water allows for ionisation

19
Q

Advantages of RMGIC as permanent cement?

A 
Adequate compressive, tensile and flexural strength - less than composite
Easy manipulation and use
Low film thickiness
F- release
Polymerisation not significantly affected eugenol-materials
Minimal post-op sensitivity 
Some adhesion enamel/dentine
Resistance marginal leakage

CRAMPS AFF

20
Q

Disadv of RM-GIC as permanent cement?

A

Dehydration shrinkage
Can create stress fractures
HEMA responsible increase water sorption - cause hydroscopic expansion
Cement bulk very hard to remove

21
Q

How to use total etch adhesive resin cement?

A

Pre tx-tooth w/ 37% phosphoric acid and dentine bonding agent prior to application
Ceramic fit surface etched HF acid - micro mechanically retentive surface
Resin cement used conjunction silence applied HF-etched crown
Form micro mechanical bond to both tooth strcuture

Need ideal moisture control

22
Q

When can total etch method be advantageous?

A

Tooth wear case w/ less ideal cervico-incisal height

May require additional bond strength

23
Q

Advantage of total etch method?

A

Superior compressive and tensile strength
Insoluble oral fluid
Adhesive
Micro-mechanical bond enamel, dentine, glass-ceramic
Wide range shade, translucencies

24
Q

Disadv of total etch method?

A

Technique sensitive
High film thickness
Marginal leak due polymerisation shrinkage
Pulp reaction if on vital dentine
No F- release
Low elasticity - can’t support long span prosthesis
Hard to remove hardened resin inaccessible area

25
Q

What is a silane coupling agent?

A

Allows materials that would not normally bond -bond

26
Q

When are self-cure resins useful as cement?

A 
When light can't penetrate
Maryland wings
Metal inlay/onlay
Endo post 
Ceramic w/ thickness >3mm from light tip
27
Q

Example of self-cure resin?

A

Panavia

28
Q

How do light cure resins work?

A

Photoinitiator must be activated for set

Depth of cure 1.5mm

29
Q

Example light cure resin?

A

Calibra

30
Q

What is a dual cure resin?

A

Enough self-cure initiator to cure w/ addition of curing light to help seal margins

Panavia 2.0

31
Q

When should dual cure resins be used?

A

ANY metal-free restorations in which question of ability of complete light penetration

32
Q

What are self-etching resin cements?

A

Require no-pre tx of tooth
Advantage of traditional resin w/ ease of use

Use w/ metallic and ceramic crown, inlay and only and PMF

33
Q

What is the bond strength of self-etching resin cements?

A

Bond strength not as high as total-etch system

34
Q

Why is bonding between resin cement and high strength ceramics hard?

A

Chemical inertness and lack of silica makes it not susceptible to etching

35
Q

What id ideal cement for metal/metal based indirect

A

RMGIC

36
Q

What is the ideal cement for hight-strength ceramic restorations?

A

Not typically watchable therefore can’t be bonded

Unicem is used

37
Q

What is the ideal cement for glass-ceramic restorations?

A

Etchable w/ HF
Bond w/ silane primer, bonding agent and cement
e.g Calibra

IODC - IRS (12 decks)

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