Exam 2: Surfaces and Interfaces Flashcards

1
Q

adhesion concern in operative dentistry

A

dentin bonding in direct restorations/fillings

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2
Q

adhesion concern in fixed prosthodontics

A

ceramic/metallic restorations and prostheses

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3
Q

adhesion concern in pedodontics

A

sealants for prevention of decay

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4
Q

adhesion concern in orthodontics

A

direct cementation of bracket and bands

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5
Q

adhesion concern in endodontics

A

sealers to fill canal space

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6
Q

when two unlike substances join together on being brought into contact because of forces of attraction b/t them

A

adhesion

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7
Q

attraction between like molecules

A

cohesion

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8
Q

a material used to produce adhesion

A

adhesive

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9
Q

the substance to which an adhesive is applied

A

adherend

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10
Q

example for adhesion: enamel/dentin and metal core of PFM are _____; dental cement is ______

A

adherends, adhesive

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11
Q

overall, _____ adhere _____

A

adhesives, adherents

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12
Q

adhesion ___ relates to properties of surface (____ ones of bulk of the materials)

A

directly, unlike

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13
Q

adhesion requires…(4)

A
  • fluid adhesive
  • reactive adherend/solid surface
  • interaction b/t adhesive and adherend
  • creation of a stable interface
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14
Q

surface tension relates to what substance?

A

liquids

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15
Q

surface free energy relates to what substance?

A

solids

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16
Q

the atoms in the surface interact _______ between them than the ones in the ____

A

more strongly, bulk

17
Q

the atoms in the surface are _____ than the ones in the bulk

A

more reactive

18
Q

force of attraction exerted on surface molecules of a liquid by the molecules beneath the surface

A

surface tension

19
Q

adhesion of atoms/ions/biomolecules or molecules of gas/liquid/dissolved solids to a surface

A

adsorption

20
Q

the incorporation of the molecules into the bulk of a material

A

absorption

21
Q

absorption: absorbed incorporated into _____

A

bulk of material

22
Q

adsorption: adhesion of substance to _____

A

surface

23
Q

when the adsorption involves a chemical reaction/strong bonding b/t adsorbed substance and surface

A

chemisorption

24
Q

when the adsorption involves establishment of weak/secondary/van der Waals bonds b/t adsorbed substance and surface

A

physiosorption

25
Q

if a surface is poorly wetted by water, it is _____ and has a ___ reactivity with water

A

hydrophobic, low

26
Q

if a surface is very much wetted by water, it is ____ and has a ___ reactivity with water

A

hydrophilic, high

27
Q

three mechanisms for adhesion

A
  1. chemical bonding
  2. micromechanical adhesion
  3. hybridization bonding
28
Q

where a liquid flows into irregularities/pores/crevices in the adherend surface

A

micromechanical adhesion

29
Q

where one phase penetrates by diffusion into the surface of a 2nd phase, forming a hybrid layer

A

hybridization bonding

30
Q

chemical adhesions in dentistry

A
  • glass-ionomer cements to tooth substance
  • adhesive resins to alloys
  • silane agents to ceramics
  • PFM (metal-ceramic interaction)
31
Q

micromechanical adhesion in dentistry

A
  • adhesion to etched enamel
  • contributes to dentin bonding
  • abraded alloy surfaces
  • etched ceramics (HF)
32
Q

hybridization bonding in dentistry

A

-bonding to dentin