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Boards 2 > Operative > Flashcards

Operative Flashcards

1
Q

what converts sucrose to glucans and fructons in s. mutans?

A

glucosyltransferase

*enamel carries

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2
Q

large molecules in saliva that agglutinate bacteria together to help eliminate them through swallowing?

A

glycoproteins

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3
Q

destroys cell walls and found in saliva

A

lysozyme

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4
Q

found in saliva and actively binds to iron (inactives iron)

A

lactoferrin

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5
Q

lactoperoxidase does what?

A

inactivates some bacterial enzymes

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6
Q

how much mineral loss must a tooth have before it is seen on xray?

A

30-40%

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7
Q

5 phases of txt planing

A

1) urgent
2) control
3) re-evaluation
4) definitive
5) maintenance

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8
Q

cutting vs
finishing vs
fine finish vs
ultra fine finish

A

cutting = 6 blades
finish= 12
fine finish= 18-24
ultra fine= 30-40

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9
Q

line vs point angle

A

line angle= junction of 2 walls

point angle= junction of 3 walls

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10
Q

outline form: extension to sound tooth structure at an inital depth of _____?

A

0.2mm into dentin

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11
Q

resistance form

A

prevention of fracture from occlusal forces

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12
Q

retention form

A

prevention of displacement

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13
Q

liner

A

CaOH

* used for direct or near pulp exposures and pulpal treatment for formation of tertiary dentin

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14
Q

desensitizer

A

GLUMA
* used for sensitivity, occludes dentinal tubules
5% glutaraldehyde
35% HEMA

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15
Q

gold only prep

A

collar= beveled shoulder around capped cusp for bracing

skirt= feather edge margin

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16
Q

base

A

RMGI

* used for metal restorations

17
Q

composite prep

A

used coarse diamond for rough walls

18
Q

amalgam prep

A

carbide bur for smooth walls

  • ** 1.5-2.0mm depth for thickness***
  • 90 degree cavosurface margin
  • 90 degree amalgam margin
  • occlusal convergence, grooves, slots, pins
19
Q

Eames Ratio

A

Dental Amalgam is 50/50 mercury/metal alloy

1) silver and copper for strength
2) tin for corrosion
3) sinc for deoxidizer but excess expansion if moisture contamination

20
Q

under tritration for amalgam

A

dry, dull, crumbly, sets too quick

21
Q

sphericalvs admixed alloy particles

A

spherical= easier to condense and stronger, microspheres of various sizes, sets faster

admixed= more condensation forces and better proximal contacts, mixture of irregular and spherical pieces

22
Q

3 mercury forms

A

1) methylmercury= organic, most toxic (fish)
2) elemental= liquid metallic, in dental amalgam
3) mercury salts= inorganic

23
Q

dentin or enamel is more mineral?

A

enamel is 88%

dentin only 50% mineral

24
Q

etch

A

phosphoric acid

  • makes microporosities and widens dentinal tubules
  • use gluma after
25
Q

primer

A

HEMA (HydroxyEthyl MethAcrylate)

  • contact dermatitis
  • prevents collagen collapse
26
Q

Bond/Adhesive

A

Bis-GMA (Bisphenol A-Glycidyl Methacrylate)

*chemically bonds to both primer and composite

27
Q

describe parts to resin

A

1) resin matric (Bis-GMA)
2) Filler particles (silica)
3) Coupling Agent (Sline)

28
Q

initiator for self cure?

A

benzoyl peroxide

29
Q

activator for self cure?

A

tertiary amine

30
Q

photoinitiator for light cure?

A

camphorquinone (need 468nm light needed)

31
Q

C-factor

A
  • larger the c-factor the most stress/shrinkage/sensitivity/leakage
  • bound to unbound
  • inversely related to GV Black
32
Q

glass ionomer

A 
*weak, salt-matrix
acid= polyacrylic acid
base= fluoraluminosilicate glass
*CHEMICAL bond 
* FLUORIDE release
33
Q

composite resin

A

*stonger, resin-matrix
* no fluoride
*micromechanical bond
Matrix= Bis-GMA
Filler= barium silicate glass

34
Q

resin-modified glass ionomers

A

light or chemical cure

*rapid polymerization and free radical initiation

35
Q

compomers (polyacid-modified resin composites)

A

paste containing both CR and GI (except for water)

* SLOW polymerization, fluoride release

36
Q

ionomer-modified composites

A

least common, has ion-leachable glasses in an attempt to achieve fluoride release

Boards 2 (15 decks)

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