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Operative 2-Final Quiz > Lecture 3 > Flashcards

Lecture 3 Flashcards

1
Q

Approach all new lesions with the idea of

A

keeping the preparation as small as possible

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2
Q

adjacent tooth damage

A

60-100%

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3
Q

reduced tooth stiffness

A

60% for MOD

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4
Q

introduce stress concentrations that lead to fracture

A
  • incidence in vital posterior teeth 70/1000

- Endo tx post teeth 50-60% fracture MOD in 7 years

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5
Q

Slot prep

A
  • 330 bur-maintain proximal enamel initially
  • Break out enamel-hand instrument
  • Maintain proximal contact if possible-Easier to restore contact
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6
Q

Bevels

A

-non-occlusal areas for retention. Not at the margins.

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7
Q

Summit prep

A

retentive groove extends to occlusal surface

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8
Q

Conventional prep

A

retentive groove extend only in dentin buccal and lingual line angles of box

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9
Q

What do we want to achieve with our restorations?

A
  • “sensitivity free” restorations
  • Good proximal contacts
  • Good margins “the perfect seal”
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10
Q

How to minimize sensitivity?

A
  • Reduce etch time on dentin
  • do not over-dry
  • Use RMGI base or liner
  • Apply GLUMA or rewet dentin
  • Apply adhesive for full 15 sec (diffusion)
  • Multiple layers of adhesive
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11
Q

When to base?

A
  • Very large and deep restorations-need to layer anyway
  • Proximal margins on cementum-best seal
  • Higher caries risk patients-Insist on tooth colored restorations, cost of indirect not desired
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12
Q

risk of recurrent caries under composite than amalgam

A

3-4x

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13
Q

more microorganisms under composite than amalgam

A

8x

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14
Q

Principle bases used under composite restorations

A

RMGIs

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15
Q

RMGI as a liner

A

Vitrebond, powder/liquid handmix.

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16
Q

RMGI as a base

A

Fuji 2 LC, activated capsule, amalgamator 11-14 seconds, apply by injection

17
Q

Why are RMGIs principle bases/liners?

A
  • Resist microleakage as well as any material.
  • Release fluoride over time.
  • Neutralize acids when dissolved.
18
Q

RMGI set reaction

A
  • triple cure
    1. Resin component LC, SC-free radical rxn occurs rapidly
    2. GI component acid-base reaction-acid-base rxn occurs slowly
19
Q

Deep proximal margins

A
  • most susceptible to recurrent decay
  • no enamel at margin
  • poor bonding potential
  • difficult to wedge without collapsing band
20
Q

Open sandwich technique

A
  • Good seal around high risk area
  • Layering minimizes shrinkage stress on box floor
  • Good tissue response
  • Helps to achieve good contacts and form
21
Q

RMGI is less stiff than

A

dentin and composite

22
Q

Potential negative consequences of RMGI

A
  • if not well adapted can leave bacterial niche

- some increase risk of composite fractures (because it is less stiff)

23
Q

Differences btwn the mechanisms of adhesions for composite vs. RMGI

A

-GI and RMGI-Water based materials, acid base set reaction, adhere DIRECTLY TO TOOTH

24
Q

Composites

A

Polymer based materials, free radical set reaction, REQUIRE ADHESIVES

25
Q

Roles of etchant (inorganic, 35%)

A
  • completely removes smear layer and plugs.
  • Demineralizes surface dentin (2-10 micrometers)
  • Leaves collagen rich surface with numerous pores.
26
Q

Conditioners

A
  • mild organic acids, weak 10% polyacrylic
  • solubilizes and removes smear layer
  • leave smear plugs intact
  • does not demineralize dentin or enamel
  • cleans surface
27
Q

T or F: Composites need adhesive.

A

T

28
Q

GI and RMGI Powder

A
  • CaFAlSiO2 glass
  • Calciumfluoroaluminosilicate
  • Acid soluble glass
  • Non-silanated
29
Q

GI liquid

A
  • 50% water, 50% polyacid copolymers

- Long chain polymers, carboxylic acid reactive groups, pH=1

30
Q

RMGI liquid

A

-35% water, 35% methacrylate modified polyacid copolymers (long chain polymers, carboxylic acid reactive groups, methacrylate reactive groups), 30% HEMA, pH 2

31
Q

GI reaction

A
  • Acid matrix dissolves periphery of glass
  • Glass releases ions (Ca2+, Al3+, F-)
  • Divalent Ca ions quickly chelate with acid polymer chains
  • Next 24-72 hours, Al3+ replace Ca2+, increased strength, F+ released
  • Acid side groups also can-chelate with glass, chelate with HA
  • Polymerization shrinkage
  • swelling from water sorption
32
Q

GI props

A

Reaction slow, GIs very sensitive to moisture in early stages soluble, rough, opaque appearance.

Operative 2-Final Quiz (3 decks)

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