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RD III > Clinical Bases and Liners > Flashcards

Clinical Bases and Liners Flashcards

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1
Q

Fuji can be used as a

A

base, liner and restorative material

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2
Q

Why use sealers, liners and bases?

A
  • Seal dentinal tubules to limit fluid movement and decrease sensitivity and limit external insult
  • seal dentinal tubules to limit external insult
  • Pulpal medication (CaOH and eugenol)
  • Replace missing dentin for indirect resorations (bases)
  • Thermal protection for metallic restorations
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3
Q

What are cavity sealers, liners and insulating bases?

A

Materials designed to be used as adjuncts to other restorative materials in order to protect the pulp against insult: specifically thermal, chemical and mciroleakage

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4
Q

What is the benefit of eugenol?

A

Its palliative (sedative) to the pulp

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5
Q

What does dycal (CaOH) do?

A

Accelerates reparative dentin formation

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6
Q

GI can provide

A

bonding, fluoride release and protease inhibition

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7
Q

Cavity sealser is a thin film which provides what?

A

Protective coating for fresh cut tooth structure in a prepared cavity (seals the dentin tubules)

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8
Q

Where are copal resins used?

A

Only under amalgan

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9
Q

Where are cavity varnishes used?

A

Under metallic restorations

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10
Q

What is a cavity varnish made of?

A

Natural gum dissolved in an inorganic solvent (acetone, chloroform, ether)

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11
Q

Copalite will remain until

A

Amalgam begins to tarnish

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12
Q

Dentin bonding agents, aka adhesives, are used to create a

A

strong, lasting bond between restorative material and dentin and enamel

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13
Q

Mechanism of bonds

A

Involves infiltrating monomers into the dentin matrix, forming a hybrid layer, and then copolymerizing with the resin matrix of the composite restoration

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14
Q

Purpose of bonds

A

ensures the longevity and effectiveness of dental restorations by providing a secure and durable bond

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15
Q

Mechanism of sealers

A

Self curing or light curing, high molecular weight resin that covers the tubules

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16
Q

Purpose of sealers

A

Reduce dentin sensitivity and helps prevent leakage under restorations under amalgams and crowns

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17
Q

Why should you not cure adhesive before cementing?

A

It can create a layer of cured adhesive and interfere with seating of the restoration

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18
Q

What is the key mechanism of Gluma?

A

the precipitation of plasma proteins within the dentinal tubules, efectively sealing them off

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19
Q

What are indications for Gluma?

A
  • Hypersensitive dentin (prevent pain and discomfort)
  • Tooth prep (alleviate sensitivity after prepping)
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20
Q

When is Seal & Protect used?

A

Abrasion lesions and root sensitivity lesions (it is a protective sealant for exposed dentin)

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21
Q

Gluma can be used to seal the exposed dentin of vital teeth that are prepared for an _______ restoration

A

indirect

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22
Q

Indications for bonded amalgams

A

large amalgams and incomplete fractures

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23
Q

Advantages of bonded amalgams

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A
  • Slight increase in amalgam retention, seals the dentin at the same time
24
Q

Disadvantages of bonded amalgams

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A

Technique and moisture, costly and time consuming

25
What is the best material for pulp capping?
Dycal
26
Dycal must be mixed and applied to a
dry tooth using small ball applicator
27
Dycal strength
low strength, therefore must be covered with a stronger base
28
Dycal solubility
Extremely soluble- can disappear over time stimulating decay
29
What is the pH range of dycal?
9.2-11.7
30
Which material stimulates reparative dentin formation, shows antibacterial activity and aids in producing a sterile environment?
Dycal
31
Does dycal have bonding capability?
No
32
What does dycal do to the final restoration?
Weakens it
33
Why must dycal be covered by a strong base?
It has low compressive strength
34
All base and liner applications (except open sandwhich with GI) must be at leas ___mm from the cavosurface margin? and why?
1mm- materials are soluble in oral fluids
35
Paste pak is a
liner only
36
Where do you not use GI?
Areas of occlusion- only use it as a temporary there
37
Fuji IX GP advantages
less moisture sensitive and more resistant to dissolution than conventional GIC
38
Why is covering GIC with a sealer during setting crucial?
Because GIC is highly sensitive to moisture during its initial setting phase. Sealer will protect from desiccation
39
Fuji II LC contains
a resin component
40
Fuji II LC advantages
faster setting time, better esthetics and higher shear bond strength
41
Considerations for Fuji II LC
May be more moisture sensitive than Fuji GP
42
Equia forte characteristics
Fluoride release and recharge capacity, good wear resistance, less technique sensitive. No polymerization shrinkage. Can be used for Class I, II and V
43
If using GI, should you use acid etch?
No- use a cavity conditioner instead
44
What is a closed sandwich technique?
Underlying material does not come into contact with the oral cavity
45
What is an open sandwich technique?
Usually used for Class II restorations where the underlying material forms part of the axial wall and is exposed to the oral cavity
46
Function of a conditioner
Creates stronger bond between tooth and GIC- removes smear layer and debris from tooth surface
47
What have been used as conditioners?
Citric acid and polyacrylic acid
48
Indication for sandwich technique
gingival margin below CEJ
49
Benefits of GI versus flowable in sandwich technique?
Moisture tolerant, bonds to tooth strucutre, releases fluoride
50
Use ______ instead of _________ in the gingival area
Flowable composite; RMGI
51
Cement bases are placed under permanent restorations to
encourage recovery of an injured pulp and to protect the pulp from thermal and chemical insult
52
Thermal protection requires what thickness?
0.75-1mm
53
Are bases needed under composite for thermal protection?
No
54
Acceptable materials for cement bases
Modified ZOE (IRM), polycarboxylate and glass ionomer cements/RMGI
55
Properties of ZOE/IRM
- Bactericidal/bacteriostatic - Obtundant in low concentrations, toxic in high concentration - pH 4-8 neutral and non irritating - Low thermal conductivity
56
ZOE/IRM applciations
1. high strength base providing obtundant effects 2. temporary restorations 3. crown cementration 4. endo sealers 5. tissue management (perio)
57
Is ZOE/IRM compatible with composite?
no

RD III (4 decks)

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