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Advanced Restorative > Glass Ionomer > Flashcards

Glass Ionomer Flashcards

1
Q

challenges
(6)

A
  • Esthetics
  • Proximity to pulp
  • Bonding to dentin
  • Isolation
  • Control of sulcular fluids effecting bond/seal
  • Micro-leakage at margin
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2
Q

Glass
Ionomer
Chemistry
(4)

A

Polycarboxylic acid
FAS glass
Water
Tartaric acid

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3
Q

Glass
Ionomer
Adhesion
*What:
* — may be
provided by manufacturer
— is removed. However, weak acid
leaves dentinal tubules plugged. DO NOT
USE —TO ETCH!
Studies show bond strength is approximately
– Mpa, higher with newer materials.**

A
  • Chelation of carboxyl groups of the
    polyacrylic acids with the calcium in the
    apatite of the enamel and dentin
    Polyacrylic acid (weak acid) primer
    smear layer, phosphoric acid
    3
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4
Q

Reinforced Glass Ionomers
(5)

A
  • Expand use of materials beyond cementing/luting
  • Miracle Mix and Ketac Silver (amalgam particles)
  • Ketac Molar and Fuji IX
  • Equia Forte (Strontium)
  • Chem-fil Rock (Zinc)
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5
Q

– Resin-Modified Glass Ionomers
(3)

A
  • Improved esthetics and handling characteristics
  • Complex setting reactions-classic GI acid-base reaction as
    well as a light activated resin polymerization. Some have
    an additional chemical-cure reaction and can set in the
    absence of light.
  • Fuji II LC, Vitremer Restorative Material, Ketac Nano,
    Geristore
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6
Q
  • Compomer-
  • —. Light-polymerized composite resin
    restoratives, modified to contain (2). Have
    decreased in use due to development of Type —
    GI/RMGI that have more favorable characteristic.
A

Polyacid-modified composite resin
(Dyract)
ion-leachable glass
particles and anhydrous polyalkenoic acid
II

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7
Q
  • Giomer-
  • Relatively new resin with —. The particles are made of
    —- that has been reacted with
    — prior to being incorporated into the
    resin. (Shofu Beautifil)
A

pre-reacted glass-
ionomer (PRG) particles
fluorosilicate glass
polyacrylic acid

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8
Q
  • Cavity Liner-
A

Used at a thickness of no more than
o.5mm under either an amalgam or composite
restorative material. Seals deep dentin exposed during
caries removal (Vitrebond Plus, Fuji Liner)

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9
Q

Applications
of Glass
Ionomer
Cements
(GIC)
Type I:
Type II:
Type IIb:
Type III:

A

Luting
crowns, FPP,
orthodontic
brackets
Esthetic
restorative
cements (GI and
RMGI)
Reinforced
restorative
cements
Lining
Cements
*Phillips’ Science of
Dental Materials:

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10
Q

Type II:
Reinforced
Restorative
Cements
* Advantages
(4)

A

– Radio-opaque
– Adhesion
– Fluoride release
– Quick set for finishing i.e. primary molars

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11
Q

Type II:
Reinforced
Restorative
Cements
* Disadvantages
(2)

A

– Weaker than resin
– No significant improvement in characteristics or
longevity over other RMGIC

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12
Q

Type II:
Esthetic
Restorative
Cements
Advantages
(4)

A
  • Useful in high caries risk patients due
    to fluoride release
  • Adequate esthetics
  • Low polymerization shrinkage
  • Excellent retention
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13
Q

Type II:
Esthetic
Restorative
Cements
Disadvantages
(2)

A
  • Shade matching not equal to
    composite resin
  • Low compressive strength
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14
Q

Type II:
Esthetic
Restorative
Cements
* Indications
(6)

A

– Non-carious cervical lesions (NCCL) and root caries
– Base to replace dentin
– Block out undercut or void- not recommended for core
build-up
– Primary dentition-small class I or class II
– Permanent dentition-open sandwich or closed sandwich
– Interim therapeutic restoration or sedative filling

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15
Q

Type II:
Esthetic
Restorative
Cements
* Contraindications
(2)

A

– Load bearing areas-Class IV, II, large I
– Areas where esthetics is extremely important

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16
Q

Advantages
of newer
formulas
(6)

A
  • Improved handling
  • Decreased viscosity
  • Lengthens shelf life before gelation
  • Increased working time
  • Shortened setting time
  • R &D $$$ to replace amalgam*
17
Q

Caries
Control
* This may involve use of — or cavitated lesions or partial caries removal and interim
restoration of all cavitated caries lesions (usually during
1-2 appointments and restoring with glass ionomer) or a
combination of both. This is critical to reduce the — and prevent further progression on the lesion
* Then, perform definitive restorative care once caries
control phase is complete.
* Most publications on GI materials state that GI is a —
releasing material, which implies protections from
secondary caries. However, GI materials must be
“—” with fluoride, which can then be re-released
in order to provide protection.

A

silver diamine fluoride (SDF)
bacterial
load
fluoride
recharged

18
Q

GC EQUIA
FORTE
➢ —
➢ Non-sticky, —
➢ No —
➢ Optimal …
➢ High — release
➢ High resistance to —
➢ — shades- I recommend choosing one shade darker if using
on the gingival —. If the tooth is A2, choose A3.5.

Bulk fill

A

Bulk fill
packable
polymerization shrinkage/stress
marginal seal for resistance to micro-
leakage/discoloration
fluoride
wear/erosion
8,
1/3

19
Q

Sandwich technique-
the placing of
— as an
intermediate layer between the tooth
structure and a resin based composite
restorative material; this restoration
design combines the (2) nature of a glass
ionomer cement with the (2) of a resin-based
composite.

A

glass ionomer cement
adhesion and
fluoride-releasing
esthetic
quality and durability

20
Q

Indications for Open
Sandwich Technique
When any part of the
gingival margin of the class
II or class V preparation has
been

A

extended past the
CEJ, and no longer has a
cavo-surface of enamel

21
Q

Open
Sandwich
Technique
for the
Class II
restoration

A

Finish and polish Finish and polish restoration.
Place Place bonding resin and composite. Light cure
Etch Etch remaining dentin/enamel keeping etchant clear of GI/RMGI
Place Place GI at the dentin/cementum margin to fill until the height of the material
is approximately the level of the CEJ. Light cure if using a RMGI
Scrub Scrub dentin at gingival floor with manufacture provided primer following
manufacture instructions
Place Place appropriate matrix option for class II
Prepare Prepare the class II restoration

22
Q

Sandwich
technique-
advantages
Minimizes …
Less — than composite resin
systems
Fluoride release provides —
environment
Useful for class – and class – restorations
Use in — risk for caries

A

gap formation at margin due to
shrinkage of the composite resin
technique sensitive
anti-cariogenic
II, V
moderate and high

23
Q

Caries
Risk
Assessment
* Caries risk assessment assists in
determining best treatment
approach
* The open sandwich technique
utilizing —- with — should be
considered the treatment of choice
for the high caries risk patient

A

RMGIC
resin

24
Q

skipped
Root caries
preparation
(5)

A

A. Mesiodistal longitudinal section illustrating a caries lesion.
B. Initial tooth preparation.
C. Tooth preparation with infected caries dentin removed.
D. Retention grooves shown in longitudinal section. Transverse
section through plane cd illustrates the contour of the axial wall
and the direction of the facial and lingual walls.
E. Preparing the retention form to complete the tooth preparation.

25
Q

Advantages
of GI
Minimal — required (ART, Sealants)
Adhesion to (2)
— release, recharging, possible caries inhibition
Minimal —
Excellent —
Low —
Good —
Excellent — compatibility

A

cavity preparation
enamel and dentin
Fluoride
shrinkage
marginal seal
solubility
esthetics
tissue

26
Q

Disadvantages of GI
(3)

A

Lower resistance to wear
compared to amalgam/resin
Lower bond strengths
compared to resin
Shades sometimes not ideal
for highly esthetic areas

Advanced Restorative (14 decks)

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