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DM > Dental Bonding Agents III > Flashcards

Dental Bonding Agents III Flashcards

1
Q

what are the direct tooth coloured materials?

A
  • resin composite
  • compomer
  • glass ionomer
  • resin modified glass ionomer
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2
Q

GIC and RMGIC are the ONLY RESTORATIVE MATERIALS that do not require adhesive systems–bond directly to tooth structure

A

ye

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3
Q

describe the phases of glass ionomer setting

A

phase I: ion-teaching phase (polyacid extracts ions from glass powder) –> mixing is shiny and glossy

phase II: (hydrogel phase) ion cause formation of polyacid matrix (Ca2+ binding to polyacid chains) –?setting (3-6 mins) –> looks shiny and glossy

phase III: polysalt gel phase–> silica gel forms and attaches powder to matrix –> maturation–: within 24hrs aand 1 year it becomes more tooth-coloured

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4
Q

what are the advantages of fully set glass ionomer?

A
  1. less shrinkage than polymerizing resins
  2. no free monomers, so it is non-irritating to the pulp
  3. coefficient of thermal expansion similar to dentin
  4. high compressive strength
  5. adheres chemically to enamel and dentin via ionic interactions on the tooth surface (polyacid monomers attach to calcium and phosphate ions)
  6. fluoride release –> can even recharge the resevoir
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5
Q

what are the disadvantages of fully set glass ionomer?

A
  1. poor abrasion resistance (wear rate)
  2. average esthetics
  3. technique sensitive
  4. suscpetible to take up additional water –> hygroscopic expansion
  5. susceptible to dehydration –> crazing, cracking
  6. low tensile strength
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6
Q

how is RMGI made?

A

conventional + resin components

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7
Q

in convetional GI polyacid chains do not connect, but in RMGI they do connect

A

ye

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8
Q

what are the improved properties of RMGI?

A
  • sets on demand
  • fewer dessication and hydration problems
  • immediate finishing
  • better esthetics (smoother surface)
  • better tensile strength and fracture toughness
  • better resistance to microleakage
  • better bond to composite resin
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9
Q

the polyacrylic acid in RMGI will reduce amounts of H2O as it is not very strong–won’t remove smear layer?

A

ye

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10
Q

glass ionomer/RMGI has the lowest failure rate of esthetic (class 5) restos

A

ye

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11
Q

what is the sandwich technique?

A
  • placing glass ionomer on the floor of the prep and either a) creating a wall out of it (open) or b (covering all GI with composite resin (closed); it improves marginal adaptations of class 2 (see page 18)
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12
Q

how does RMGI reduce secondary caries?

A

Fluoride release –> remineralization –> reduction of secondary caries; can use fluoride dentifrices to recharge the resevoir

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13
Q

what are the main advantages of compomers?

A
  • ease of placement
  • no mixing
  • handling
  • less susceptible to dehydration
  • radiopaque
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14
Q

what are the main disadvantages of compomers?

A
  • opaque, brittle
  • weaker physical properties than composite
  • require a bonding agent like composites
  • marginalstaining and chipping
  • wears more than composite
  • clinical significance of fluoride release undetermined
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15
Q

what are composite cements composed of?

A

monomers + silicate glass filler + coupler

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16
Q

what are the uses for composite cements?

A

metallic restos, ceramic restos, composite inlays

17
Q

disadvantages of composite cement?

A

difficult to light cure cement under restos

18
Q

with composite cements enamel and dentin are etched, primed, and bonded

A

ye

19
Q

the silane coupling agent can bind inorganic materials like glass, mineral fillers, metals and metalic oxides to organic resins; however it cannot work with alumina or zirconia

A

ye

20
Q

how to composite cements bind to metal bridges, crowns, and ortho appliances?

A

by chemical retention – bind through TIN or SILICIA

micromechanical retention – chem. etching, dissolution of salt crystal in the wax, abrasive unit, mash, bids

21
Q

how do composite cements bond to ceramics bridges, crowns, and ortho appliances?

A

chemical retention – silane

micrhomechanical retention — chem etch, abrasive unit,, diamond bur

22
Q

why would we bond a composite cement to amalgam?

A
  • for retention (mechanical), sealing

DM (18 decks)

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