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Operative Final 2017 > Composite I/II > Flashcards

Composite I/II Flashcards

1
Q

What do Glass Ionomers have that composites lack?

A

Resin modified GIs

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2
Q

Glass Ionomers: Hydrophillic or hydrophobic

A

hydrophillic; They are water based.

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3
Q

Composite: Hydrophillic or Hydrophobic?

A

Hydrophobic; resin based

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4
Q

Are glass ionomers and composites adhesive?

A

Glass ionomers are Self adhesive which means that adhesives are not required where as
but composites are not adhesive therefore they need an adhesive.

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5
Q

2 phases of dental composite

A

Dispersed phase and Matrix phase

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6
Q

Matrix phase:

A

Continuous phase
Monomer Resin
initiators

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7
Q

Dispersed phase:

A

Discontinuous phase
glass fillers
colorants

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8
Q

what classifies a composite as hetero/homogenous?

A

If composite simply contains of filler particulars and uncured matrix material it is classified as homogeneous BUT if it includes precured composite or another unusual filler it is hetergenous.

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9
Q

what are Monomethacrylates?

A

(monomer functional groups)

They are Linear Chains–> soft

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10
Q

What are Dimethacrylates?

A

Branched and crosslinked-rigid

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11
Q

Composite monomers are Difunctional ________

Form highly _________networks

A

methacrylates

crosslinked rigid

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12
Q

what are the 3 Monomers in Composite:

A

Bis-GMA (rigid backbone)
Urethane dimetrhacrylate UDMA (more flexible backbone)
Triethyleneglycol dimethacrylate TEGDMA

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13
Q

How do Silicate glass fillers influence properties: (non-soluble)

A

Non-soluble

Strengthen (Rule of mixtures
More filler more strength)

Optical properties (Color, Translucency)

Radiopacity

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14
Q

Properties of fillers surface?

A 
Glass have a hydrophillic surface: 
--  Silica tetrahedrons
–  Surface hydroxyl groups
–  Attract water molecules
–  Inhibits wetting of surface with monomers (hydrophobic)
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15
Q

What do Silane Coupling agents provide?

A
  • Improve composite properties
  • Adheres (couples) filler to resin phase
  • Primer
  • MPS - methacryloxypropyltri methoxysilane
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16
Q

What does polymerization do to monomers +Silanated filler PASTE?

A

Solidifies the paste by curing it with free radical polymerization (chemical and light)

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17
Q

what are 2 Wear mechanisms (Particle plucking)?

A

Abrasive (none contact wear, food abrade polymer)

Attrition (occlusal contact wear, higher stresses (polymer microfractures))

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18
Q

2 ways composites have improved (particle technology)

A

softer and smaller particles

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19
Q

Filler Phase (Silicates)

  • properties of Crystalline (original)?
A

_ Quartz, crystobalite, tridymite
– Radiolucent
– Very hard and abrasive

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20
Q

Filler Phase (Silicates)

*Non-crystalline (glasses) modifications?

A

– Modified to improve characteristics
– Softer (Na, K, Ca)
– Additives to make glass Radiopaque (Ba, Zr, Y, Al) – More crushable (Al, Li)

21
Q

What kind of etch do we use?

A

phosphoric acid

22
Q

two types of adhesive systems? what do we use?

A 
total etch (etch & rinse) 
selective etch (self etch)

we use total etch!

23
Q

do we use 2 step or 3 step total etch?

A

we use 2 step.

24
Q

What kind of filler do we use?

A
  • nanofill: filtk supereme ultra universal (3M)

* No glass fillers – only silica particles in the range 5-100nm and aggregations of silica particles (nanoclusters)

25
Q

What kind of etch and how long?

A

we use 37% phosphoric acid etch for 15-20 seconds

26
Q

What nanohybrid have we used (OSU clinic)?

A

Herculite Ultra (Kerr) is a nanohybrid used in clinic

27
Q

2 types of bulk fill

A 
sonic fill (kerr dental):
Comes in capsules that engage in a slow speed

tetric Evoceram (Ivoclar): A special photo-initiator that increases the depth of cure

28
Q

3 different kinds of retainer systems

A

1- Tofflemire with circumferential bands
3- Sectional matrix
2- Retainless Tofflemire Absence of matrix retainer

29
Q

Pre-contoured Sectional matrix band are how thin?

A

001”

30
Q

Prongs on rings produce?

A

seperation between the teeth and some are made of plastic and others made of silicone pads.

31
Q

two different kinds matrix bands/material/thickness

A

Circumferential or sectional matrix bands

Material::
Metal
Polyester – Clear or blue

Thickness of the bands::
Thin 0.0015”
Ultra thin (Dead soft) 0.001”

32
Q

What kind of wedge did we use

what kind of wedge did we use for circumferential & sectional?

A

wizard wedge
wizard wedge for circumferential
Anatomical wooden wedge for sectional.

33
Q

Function of wedges

A

1- Seal gingival margin to prevent overhang
2- shape and rebuild the proximal contact should be correct above just above adjacent tooth marginal ridge.
3- Wedges adjacent teeth to compensate for the band’s thickness

34
Q

3 kinds of wedging techqniue

A
  1. wedge wedging
  2. piggyback wedging
  3. double wedging
35
Q

Provide all steps for composite restoration

A

1- Anesthetic- Isolate- select shade-
Examine the margins of the preparation, have a plan
Profound Anesthetic + shade selection+ check occlusion

2- Etch with Phosphoric acid Etch 37% phosphoric acid for 15 s (etching removes smear layer. It opens dentin tubules and removes smear plugs. pH=2/strong self adhesive etch)

3- Rinse thoroughly : air-water spray copious water (DON’T desiccate because if you over dry you will have a ton of collagen fibers that collapse in the dentinal layer and Over-drying can evaporate water out of tubules and cause bite sensitivity)

4- Lightly air dry
5- Apply adhesive-cure (apply 1-2 coats of adhesive lightly dry it–Adhesive infiltrate moist dentin) –> Resin tag and hybrid layer created

6- Apply selected shade of composite in increments Cure for 20 s

36
Q

which etching system do you use?

A

total etch system: Two step: 2 bottle system etch, prime + bond (these are together)

37
Q

two adhesive systems

A

1- Total etch system: etch, rinse, apply bonding agent
• PH=2
• Preferred when there is enamel margins
• Two step: 2 bottle system etch, prime + bond
• Three step (conventional): 3 bottle etch, prime, bond

2- Self etch adhesive “No Etch and Rinse step”
• PH=3-5
• Two step: 2 bottle acidic primer, bonding agent
• One step: 1 bottle acidic primer + bonding agent

38
Q

What etch system do we use? (brand)

A

Optibond Solo Plus Kerr- Total etch system

39
Q

4 composite instruments we use

A

BBL
CVIPC
8A
Contact Former

40
Q

What do you do after you’re finished with your restoration?

A
  1. Remove Rubber dam
  2. Evaluate the margins –Check for excess- check for deficiencies
  3. Check for proximal contact
  4. Check Occlusion With articulating paper and miller forceps
  5. Adjust occlusion with rotary carbide finishing burs
41
Q

What do you use to polish?

A

Soflex finishing and polishing kit (helps remove excess composite)
Diacomp Polishing Wheels

42
Q

_____ inhibits resin penetration into dentin

A

smear layer

43
Q

Smear layer consists of:

A

Ground bits of HA,
collagen, bacteria, salivary proteins
smear plugs

44
Q

_______ completely removes smear layer and plugs

Demineralizes surface dentin (2-10 μm) & Leaves a collagen rich surface with numerous pores.

A

etchants

45
Q

Curing Light Technology

A
  • Halogen Lights
  • Plasma Arc Lights
  • Argon Lasers
  • LED (light emitting diode) Lights
46
Q

______ should create the so-called ______ (consisting of a collagen network exposed by etching and embedded in adhesive resin).

A

Adhesive resin

hybrid layer

47
Q

Smear layer

A

ground HA and collagen

48
Q

Intact dentin

A

HA & Collagen

Operative Final 2017 (1 decks)

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