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SP16- Operative > Glass Ionomer Materials > Flashcards

Glass Ionomer Materials Flashcards

1
Q

_____ are water-base materials that adhere directly to the tooth via acid-base set reaction.

A

Glass Ionomers

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2
Q

______ are polymer based materials that require adhesives and set via a free radical reaction.

A

composites

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3
Q

Ionomers attach by ______ with HA surfaces.

A

chelating

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4
Q

Adhesives need a ______ dentin surface with exposed _____.

A

demineralized

collagen

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5
Q

True or False: Conditioners are used with composite materials.

A

False, Glass Ionomers use conditioners

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6
Q

What is a conditioner?

A

MILD organic acid (use with Glass Ionomer)

  • solublizes the smear layer
  • leaves smear plugs in tact
  • does NOT demineralize dentin or enamel
  • cleans the surface
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7
Q

What is an etchant?

A

Inoranic acid (use with composite)

  • completely removes smear layer and plugs
  • demineralizes surface dentin (2-10micrograms)
  • leaves collagen-rich surface with many pores
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8
Q

Which acid is inorganic, that used for etching or conditioning?

A

etchant = inorganic

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9
Q

Which acid is used as an etchant?

A

35% phosphoric acid

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10
Q

Glass Ionomer and RMGI consist of what two components?

A

powder (glass usually)

liquid (water and acid)

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11
Q

The powder component of GI contains ______ glass. Why is that important?

A

non-silanated, acid soluble glass

  • the liquid portion contains polyacid copolymers that will dissolve the periphery of the glass
  • the glass will then release ions: calcium, aluminum, and fluoride
  • the calcium ions are divalent and will quickly chelate with acid polymer chains
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12
Q

The glass ionomer reaction continues to act over the next 24-72 hours. During that time, _____ replaces calcium ions and _______ in strength.

A

aluminum

increases

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13
Q

What are the disadvantages to using Glass Ionomer?

A
  • slow setting
  • early dissolution
  • optical properties are not as good (opacity)
  • stain resistance is meh
  • poor strength
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14
Q

True or False: RMGI and GI contain the same powder component.

A

True, its the liquid component that is modified

Do you remember what type of glass the powder contains?

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15
Q

GI contains ____% water and ____% polyacid copolymers. RMGI contains _____% water, 35% _______ modified polyacid copolymers, and ____% HEMA.

A 
GI = 50:50
RMGI =
35% water
35% METHACRYLATE modified polyacid copolymers
30% HEMA
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16
Q

What type of reaction occurs with GI? What type of reaction occurs with RMGI?

A

GI: ionic (IONomer = IONic)

RMGI: ionic and free radical (R for Radical)

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17
Q

Free radical reactions (such as that with RMGI and composites) will produce some degree of _______.

A

polymerization shrinkage

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18
Q

True or False: During a resin ionomer reaction (such as that with RMGI), there is a net dimensional change due to shrinkage.

A

False, there is a ZERO net dimensional change because polymerization shrinkage is balanced by swelling due to water absorption.

(Think: RMGI contains only 35%water; whereas, GI contains 50% water. RMGI is therefore a little thirsty and is going to want to absorb some water)

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19
Q

True or False: GI sets by an acid-base reaction.

A

True, acid base (aka: ionic)

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20
Q

RMGI sets by a ______ cure.

A

Triple

  1. light cure
  2. self cure
  3. acid-base reaction
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21
Q

Which reaction occurs more quickly: free radical or acid-base?

A

Free radical is RAPID

acid base is SLOW

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22
Q

The rapid free radical reaction of RMGI protects the matrix from early ______.

A

solubility

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23
Q

The slow acid-base reaction of RMGI causes the properties to ______ over time.

A

improve

24
Q

Compare composite, compomer, RMGI, and GI:

Which OSU product has the lowest %opacity?

A

Fuji II LC (RMGI material type)

25
Q

Compare composite, compomer, RMGI, and GI:

Which OSU product has the smallest marginal gap?

A

Fuji II LC (RMGI material type)

26
Q

What are the advantages to using RMGI and GI?

A
  1. Provide a good seal between dentin and material

2. Recurrent caries inhibition potential

27
Q

What are the advantages to using RMGI instead of GI?

A
  1. Improved solubility resistance
  2. Improved strength (less stiffness though)
  3. Improved optical properties
28
Q

RMGI material is used for high risk patients for restoration of _____ or ______ areas.

A

cervical

deep proximal

29
Q

Where is the “open sandwich” technique used?

A

deep proximal margins

  • area most susceptible to recurrent decay
  • area where no enamel is present at the margin
  • area with poor composite bonding
30
Q

What are the four steps to caries removal?

A
  1. Slow speed with a large round bur (+/- spoon excav.)
  2. Clear DEJ first (most aggressive)
  3. Clear area over the pulp (less aggressive)
  4. Use tactile sense to detect unsound tissue (tugback)
31
Q

“The seal is the deal” means…..what?

A

if you seal the site, caries remain dormant and does not progress. Therefore, you can leave some affected dentin in order to avoid exposing the pulp!

32
Q

What are the three preparation designs for Class 3 and Class 5?

A
  1. Conventional (GV Black/amalgam principles)
  2. Beveled Conventional (composite only)
  3. Modified (minimal prep, for any adhesive materials)
33
Q

The beveled conventional preparation design is only used when preparation walls are in _____.

A

enamel (remember, composite bonds best to enamel)

34
Q

The “conventional” preparation design has a _____ degree cavosurface enamel margin, uniform ______mm depth into dentin, and ______ retention.

A

90
0.5mm
mechanical

35
Q

True or False: Both the conventional and modified-conventional prep designs will have a uniform 0.5mm depth into dentin.

A

False,
Conventional and BEVELED conventional = 0.5mm in
MODIFIED conventional = removal of defective tooth structure only

36
Q

What are the five selection criteria that must be considered when choosing a restoration material?

A
  1. esthetics
  2. location
  3. expected prognosis (long/short term)
  4. Etiology of lesion (carious?)
  5. Caries Risk of patient
37
Q

What are four examples of non-carious lesions that would be restored?

A

attrition (tooth to tooth)
abrasion (mechanical/toothbrushing)
erosion (chemical)
abfraction (bruxism/forces)

38
Q

Carious lesions are more visible when _____.

A

dried

39
Q

Incipient carious lesions of enamel appear as ______.

A

white spots

40
Q

The mesiodistal walls of a Class V preparation will ____ slightly and the gingival floor will follow the _____.

A

diverge (following the enamel rods)

curvature of the FGM (0.5mm above)

41
Q

A conventional Class V preparation is deeper _____ than _____.

A

deeper incisal than gingival

42
Q

True or False: Using a bevel with GI or RMGI will increase the bonding strength.

A

False, bevels are only used for composites because they bond best to enamel. RMGI and GI are weaker in thin areas

43
Q

What are the advantages to composites?

A
  • use of conservative prep (adhere to tooth/enamel)

- esthetic

44
Q

The mesial and distal length of a Class V preparation will extend to ______.

A

the mesial and distal line angles of the tooth

45
Q

The axial depth of a Class V preparation is ______ at the incisal portion and _____ at the gingival.

A

1.2 mm incisal

1 mm gingival

46
Q

True or False: Composite, RMGI, and Amalgam can all be used for Class III restorations.

A

True

47
Q

What is the most common technique for Class III preparation/restoration?

A

Lingual Approach

48
Q

For a conventional Class III preparation, the incisal wall is left in contact and the gingival wall ______.

A

has clearance

49
Q

What is the minimal facial depth for a class III prep?

A

typically 1.0 to 1.5mm to minimally break facial contact

50
Q

For a conventional Class III preparation design, it is okay to undermine ______ but not okay to undermine _____.

A 
dentin = okay
enamel = not okay
51
Q

How does the beveled preparation differ from the conventional Class III preparation?

A

lingual bevel =45 degrees

no retention grooves (conventional has Incisal and Gingival grooves)

52
Q

The axial walls of a Class III prep should extend 0.2 mm into dentin and should be deeper incisally than gingivally. What is the axial depth on a lateral? Central?

A 
lateral = 1.0 mm
central = 1.2 to 1.5 mm
53
Q

After filling a prep with one increment of composite, use a _____ to shape the material and cure.

A

mylar matrix

54
Q

After curing, use a ____ blade to remove proximal flash and use a _____ to contour the restoration.

A 
#12
fluted finishing bur
55
Q

After using the finishing bur, use _____ and then ______ (if needed).

A 
sand disks
sand strips (if needed)

SP16- Operative (8 decks)

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