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Dental Materials > Dental Adhesion > Flashcards

Dental Adhesion Flashcards

1
Q

what is adhesion?

what are most instances of dental adhesion also called?

-how is adhesive bond strength evaluated?

A
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2
Q

what is an adhesive joint the result of?

A
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3
Q

name the follow joint types

A
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4
Q

what is bond strength?

how is it categorized?

A
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5
Q

tensile vs shear bond strength?

A

most tensile bond strength only about half of shear bond strength

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6
Q

type of interactions at bonded interface?

A

physical, chemical, mechanical bonding

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7
Q

physical bonding?

invovles?

A
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8
Q

chemical bonding?

A
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9
Q

mechanical bonding?

A

-almost every case of dental adhesion is based primarily on mechanical bonding

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10
Q

what are grindign and etching used for?

  • what is grinding?
  • what is etching?
A
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11
Q

what must there be to produce good bonding?

A
  • good wetting, clean surfaces,
  • bonding systems are designed with etching, priming, and bonding steps to accomplish this
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12
Q

enamel bonding systems

-consist of?

A
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13
Q

dentin bonding systems

  • what is the primary action of dentin bonding systems designed to do?
  • what does this facilitate?
A
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14
Q

key ingredident for priming in many dentin bonding systems?

A

HEMA (hydroxyethyl methacrylate)-tendency to produce some mild sensitivity and skin irritation

-use high volume evacuation to minimize vapour contact

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15
Q

dentin bonding 2 component systems

-what they do?

what is needed to produce a good hybrid layer?

A

they employ etching with priming/bonding or etching/priming with bonding

-dentin must be hydrated to produce a good hybrid layer (this is b/c ethced dentin no longer has HA crystals between collagen fibers on surface and these remaining fibers collapse when dehyrated which blocks monomer penetration)

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16
Q

dentin bonding one component system

A

-multipurpose bonding systems with 3 components will be used more so they are more flexible to accomodate the various restorative materials

17
Q

amalgam bonding systems

-used for? what do they require?

A
  • used to seal underlying tooth structure and bond amalgam to enamel and dentin
  • require dual characteristics to achieve optimal wetting
  • amalgam is strongly hydrophobic and enamel and dentin and hyddrophilic
  • SO they need a wedding agent (comonomer) that can wet both amalgam and tooth structure, the most common one in 4-META (it has both hydrophobic and hydrophilic ends)
18
Q

macroshear bond strength of amalgam?

A
  • macroshear bond strengths are relatively weak
  • but good bondind to tooth structure occur
  • micromechanical bonding at the interface of amalgam is poor and no chemical bonding occurs here
  • to get better mechanical bonding amalgam bonding system is applied in thicker layers so the amalgam being condensed against the resin adhesive layer will force fluid components of amalgam to squeeze into the unset bodning materials, producing laminations of the two materials
19
Q

advatage of amalgam bonding?

primary indication of amalgam bonding?

A
  • primary advantage for amalgam bonding agents is dentin sealing
  • adhesion of amalgam to tooth structure is not necessary when satisfactory retention and resistance already exist
  • primary indication for amalgam bonding is when weakened tooth structure remains and bonding may improve the overall resistance form of the restored tooth
20
Q

when to use dentin sealers?

A
21
Q

what are dentin sealers? (monomers or something else?)

-what do they do?

A
22
Q

what is a dentin desensitizer?

A

it is when a dentin sealer is used on an exposed root surface to lessen root sensitvitiy

23
Q

3 ways fractured regions on porcelain fused to metal or all ceramic restorations can be repaired

A

however this isnt a long term solution, wetting of ceramic materials by bonding materials is different than for dentin and may not work well with all systems

24
Q

pit and fissure sealants

-why needed?-what they do?

A
25
Q

how do sealants cure?

A

they are either self curing or visible light cured

26
Q

pit and fissure sealants

  • are modern compositions filled or unfilled?
  • would you add colorant?
A

most are unfilled resins such as BIS-GMA

-small amounts of colorant such as Ti02 may be added to aid in distinguishing it from enamel

27
Q

pit and fissure sealants

-penetration coefficient?

A

-if site is well cleaned, ethced rinsed and dried the acyrlic monomers such as BISGMA wet surface well and capillary action will draw the liquid materail into the crevice

28
Q

pit and fissure sealants

-is complete penetration of the sealant needed?

A

not critical

29
Q

are tradition composites good sealants?

A
30
Q

what are flowable composites used fo?

A
31
Q
A

Dental Materials (15 decks)

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