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Resto > Cavity bases, liners, and varnishes > Flashcards

Cavity bases, liners, and varnishes Flashcards

1
Q

What is needed when the removal of carious dentin is necessary (beyond the min depth required by principles of mech’l design?

A

-cav liner, intermediary base, cement base, or combination

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2
Q

why sound dentin the best barrier bet resto mat’l and pulp?

A

minimal dentin will be the cause undesirable effects toward the pulp because of resto mat’l

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3
Q

name 5 pulp irritants

A
  1. injudicious cutting of dentin
  2. acids and monomers in cements and composites
  3. thermal changes conducted by metallic restove matl
  4. fluid and bacteria at th-filling interface
  5. transmission of occ forces to the filling matl
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4
Q

what are 4 functions of Cavity liners?

A
  1. chemical barrier against acids and monomers
  2. stimulate formation of reparative dentin
  3. sterilize residual carious dentin w/ its anti-bacterial action
  4. can be used in direct and indirect pulp capping
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5
Q

what is direct PC?

A

-directly cover pulp w/ liner (becoz of pulp exposure)

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6
Q

what is indirect PC?

A

-leave some carious dentin and cover w/ CaOH to stimulate reparative dentin

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7
Q

name 3 properties of cavity liners?

A
  1. compatible w/ most resto’ve mat’l-thin
  2. low compressive strength-so can’t be under Am
  3. high solubility-(never leave on cavosurface margins bec it will dissolve and leave a gap => microleakage
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8
Q

what are the manipulation of cavity liner? 5 steps…

A
  1. mix equal amts of two pastes ona paper mixing pad, fast.
  2. apply using dycal applicator
  3. apply to (deeper) dentin portions close to pulp
  4. don’t mix CaOH on floor of cavity- if cav is large, mix in small amts then apply then repeat
  5. after setting, you can trim excess w/ spoon excav, gently.
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9
Q
  • Name the components of liners

- Name the bases

A
  • CaOH or zinc, CaOH in methyl cellulose or hydroxyl ethyl cellulose paste, CaOH w/ distalled water (CaOH w/ ZnO, Titanium Dioxide) (Ca Tungstate, Disalicylate ester, ZnO)
  • ZnPO4 cement, reinforced ZnO-Eug cement, ZnPolycarboxylate cement, GI cement
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10
Q

what are 2 uses of cavity bases?

A
  1. provides chemical and thermal insulation

2. provides strong support during insertion of permanent filling mat’l w/c receives masticatory forces

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11
Q

Name the base with these properties:

  1. high compressive strength
  2. acidic pH
  3. may be mixed to a putty consistency depending on the amt of powder (u can mold it)
A

Zinc phosphate

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12
Q

manipulation of Zinc phosphate

A
  1. use a cool glass slab so setting can be delayed (for longer working time, where we can incorporate as much powder as we can so putty consistency
  2. glass slab should be dry or else will decrease the working time
  3. mix in circular motion over a large area, dividing in increments to be mixed
  • if too dry-will crumble
  • if too thin-too weak , will stick to instrument
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13
Q

how to apply Zinc phosphate (4)

A
  1. using woodson filling inst, get a portion and mold it into a ball
  2. plug it flat and smooth inside the cavity while it still has softness
  3. before setting, remove the excess in cav walls esp cavosurf (or microleakage)
  4. it shd only be as thick as possible to provide sufficient bulk for Am
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14
Q

Name the base with these properties:

  1. bacteriostatic
  2. eugenol portion interferes w/ setting of filled and unfilled resin so never use as a base for composite resins
  3. has low potential to irritate [pulp]
  4. compressive strength lower than ZnPO4
A

Reinforced Zinc Oxide-Eugenol

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15
Q

how to manipulate Zinc Oxide Eugenol in 3 steps

A
  1. use a clean, dry glass slab and cement spatula
  2. mix in large increments via a folding motion; mixing complete in 1 min
  3. consistency is putty-like [smooth]-sets into stronger mass
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16
Q

Name the base w/ these properties:

  1. compressive strength is lower than ZnPO4 but higher than rein ZOE
  2. acidic , yet not irritating as ZnPO4
  3. chemically adhesive to enam and dentin
  4. good thermal insulator
A

Zinc Polycarboxylate

17
Q 
Name the base w/ these properties
1. good mech'l strength
2. lower solubilty than other cements
3. chemically adhesive to e & d
4. Fl release
5 can be acid etched
6. Biocompatible, pulp-friendly, not really acidic becomes basic right away
A

Glass ionomer

18
Q

-film-forming solutions of natural or synthetic resin in an organic solvent like acetone, ether, alcohol, copal ether varnish

A

cavity varnish

19
Q

-when applied to th surface, the solvent quickly evaporates leaving a thin film w/c is insoluble to oral fluids

A

cavity varnish

20
Q

what are the 4 functions of Cavity Varnish?

A
  1. reduces marginal leakage in Am restos by minimizing ingress of fluid and bacteria at the resto-th interface
  2. retards and may even prevent Am corrosion products from penetrating into dentin
  3. reduces the penetration of acids fr. dental cements into dentin
  4. reduces post-operative sensitivity
21
Q

what are 3 contraindications of Cavity Varnish?

A
  1. cant be used w/ Co resin
  2. cannot be used on acid etched e
  3. not for GI and polycarb
22
Q

how to apply cavity varnish in 2 steps

A
  1. cav wall must first be dry and clean

2. apply 2 coatings (bec the solvent evaporates leaving voids)

23
Q

Summary:

  • placed on very deep portions of cavities
  • pulp capping: direct and indirect
A

liners

24
Q

Summary:

-thermal protexn and chemical and mechanical

A

bases

25
Q

Summary:

on all cav walls of Am prep and never on composites, etched preps, GI, and polycarb

A

varnish

26
Q

name 6 functions of temporary restorations

A
  1. protxn of dentin and pul from thermal, chem’l, mech’l irritants
  2. maintenance of occlusal relationships
  3. prevention of drifting
  4. protecting and support of the gingiva
  5. maintenance of esthetics
  6. protxn of margins of prep’s th
27
Q

Definition:
Used as interim dressings to cover newly exposed dentin and e surfaces of prepared cavities.
-provides protexn and function for the th until permanent filling can b inserted
-to stabilize an existing disease condition

A

Temporary restorations

28
Q

why is it importan for the placement of a temp resto?

A

will maintain the th’s position in the arch by maintaining contacts w/ other ts-proxl adj or opposing/antagonist

29
Q

under pulpal inflammn, which temp resto is beneficial as it creates a favorable biologic envt for the anticipated resto, by minimizing the ingress of oral fluids

A

ZOE temp resto

30
Q

what temp resto alleviates discomfort?

A

eugenol

31
Q

may be used alone where the centric stops of the the prep’d th have not been removed. Sufficient th must remain to retain it.

A

ZOE cement

Resto (2 decks)

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