Composites Flashcards

1
Q

The success of a restoration depends on (2)

A

Operator and technique

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2
Q

What do we consider with the selection of restorative material? (3)

A
  • Age: time it’ll be in the mouth
  • Risk of caries: risk of filtration and secondary caries
  • Child cooperation: moisture control
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3
Q

What is composite resin?

A

Polymeric material

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4
Q

What is the structure of composite resin? (5)

A

Methacrylate polymers –> monomer with doble

bond –> polymerization –> breaking of the doble bonds –> unión in long chains of polymers

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5
Q

Composite resin: obturation material adheres _____ to the tooth surface, not …. (2)

A
  • micromechanically

- not depending on a specific design

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6
Q

Clinical success of composite resin depends on? (3)

A
  • Process of adhesion
  • Interphase sealing
  • Avoids bacterial invasion
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7
Q

Define adhesion

A

State where 2 surfaces stay together through forces based

on chemical and/or mechanical mechanisms with the mediation of an adhesive.

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8
Q

Composite resin: 2 types of adhesive?

A

1-They need acid etching (conditioning of the surface with
orthophosphoric acid)
2-Self-etching adhesive

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9
Q

Composition of composite resin? (4)

A
  1. Organic matrix(resine).
  2. Inorganic matrix. Filler particles.
  3. Agent of Union (Silane)
  4. Photosensible molecules and starters of the polymerization
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10
Q

Composite resin organic matrix? (2)

A

• Matrix does not differ much between different
composites. Most use Bowen´s resin or the BisGMA (bisphenol A-glycidyl methacrylate).
• TEGMA added due to the great viscosity of the BisGMA.

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11
Q

Composite resin inorganic filler and fractures?

A

Gives physical resistance to fractures

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12
Q

Composite resin inorganic filler reduces…? (2)

A
  • Contraction of polymerization

- Coefficient of thermal expansión

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13
Q

Composite resin inorganic filler usually made of? (5)

A
  • Quartz
  • Silica
  • Boron
  • Barium
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14
Q

How are composite resins classified? (3)

A

Size, shape and amount of the

filler

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15
Q

Composite resin classification depending on size of particle? (4)

A
  • Macrofiller (no longer sold)
  • Microfiller
  • Nanofiller
  • Hybrid
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16
Q

Composite resin classification depending on amount of filler? (3)

A
  • Fluid composite
  • Condensable composite
  • Bulk composite
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17
Q

Size of macrofiller particles?

A

10-100 um

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18
Q

Size of microfiller particles?

A

0.1-1 um

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19
Q

Properties of hybrid particles in composite resin? (3)

A
  • It contains macro and microfiller
  • Bigger resistance than microfiller
  • Better polishing than macrofiller
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20
Q

Size of nanofiller particles?

A

0.0005 - 0.01 um

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21
Q

Properties of fluid composite? (4)

A
  • 37-53% of inorganic content
  • It reduces the mechanical properties
  • Cavities of minimal invasion
  • Base in composite restorations
22
Q

Properties of condensable composite? (4)

A
  • More filler particles (65-75%)
  • Indicated in posterior and anterior teeth restorations
  • Worse finishing and polishing
  • Better mechanical properties
23
Q

Advantages of composite resin? (5)

A
  • Easy manipulation
  • Good esthetics
  • Relatively low thermal conductivity
  • Cavity preparation less aggressive
  • Dimensional stability
24
Q

Disadvantages of composite resin? (5)

A
  • Sensible to moisture
  • Worse condensation than the amalgam
  • Contracts during the curing
  • It suffers erosion
  • > postoperative sensibility
25
Q

Indications for composite resin? (8)

A

Ø Class I, II, III, IV and V restorations
Ø Broken anterior teeth
Ø Restoration after pulp treatment (not directly on top ZOE)
Ø Closure of diastemas
Ø Recuperation or transformation of the anatomy (ankylosed
teeth, conoid teeth)
Ø Restoration of small defects in the enamel
Ø Direct veneers
Ø Restoration of cervical lesions in case of dental sensitivity

26
Q

Contraindications for composite resin? (2)

A

Ø Bruxist patients

Ø Inherent characteristics of the composite resins

27
Q

Obturation technique with composites are very sensible to manipulation because… (2)

A
  • Absence of moisture

- Absence of debris (gingival fluid, blood, oil)

28
Q

Instruments needed for the obturation technique with composites? (10)

A
  • Mirror
  • Probe
  • Tweezers
  • Cellulose acetate and metallic matrix
  • Wooden wedges
  • Plastic instruments
  • Burnisher
  • Polishing discs and burs
  • Low speed and high speed handpieces
  • Articulating paper
29
Q

Coarse surfaces with the obturation technique may… (2)

A

retain plaque and color changes

30
Q

How many steps are in the obturation technique?

A

13

31
Q

Obturation technique step 1 (2)

A
  • Drill caries

- Clean cavity with clorhexidine 0.12%

32
Q

Obturation technique step 2

A

Clean enamel with cup or brush

33
Q

Obturation technique step 3 (3)

A

Place matrix if necessary:

  • Metallic: Class II cavities
  • Cellulose acetate matrix (plastic matrix): Class III & IV
34
Q

Obturation technique step 4 (3)

A
  • acid ethcing with ortophosphoric acid gel at 30-37% for 30 sec
  • Attention with adjacent teeth and gum
  • Creates micropores that will enable the micromechanic bonding
35
Q

Obturation technique step 5?

A

Water rinse with pressure for 20 seconds to get rid of acid and loose bits of enamel prisms

36
Q

Obturation technique step 6? (3)

A
  • Drying intermitentely without drying out the dentin
  • With clean air free of oils and humectants
  • IF area is contaminated it must be etched again for 10 seconds
37
Q

Obturation technique step 7? (2)

A
  • Bonding (placing adhesive) on etched enamel and whole cavity
  • Adhesive placed with brush and spurt air to achieve minimum thickness (smaller interphase) and evaporate solvents
38
Q

Obturation technique step 8?

A

Apply light for 10-15 seconds

39
Q

Obturation technique step 9? (3)

A
  • Application and modeling of composite w/plastic instrument in layers of <2mm to minimize contraction of polymerization at the deepest areas
  • avoid air entrapment and contact of opposite walls
  • Try to minimize action of modeling and do not infraobturate
40
Q

Obturation technique step 10?

A

Apply light on each layer of composite for 40 seconds

41
Q

Obturation technique step 11? (2)

A

Finishing

  • With hand instruments: (scalpel), to finish the line of termination
  • With burs: the diamond burs may scratch the enamel, so the will be used only to rough down the big chunks of composite.
42
Q

Obturation technique step 12?

A

Remove rubberdam and occlusion adjustment with articulation paper

43
Q

Obturation technique step 13?

A

Polishing

44
Q

Obturation technique class I & V (5)

A
  • NOT NECESSARY TO USE MATRIX
  • ACID ETCHING, RINSING, DRYING, BONDING
  • INCREMENTAL TECHNIQUE
  • LIGHTCURING BY LAYERS
  • POLISHING (OCCLUSION ADJUSTMENT)
45
Q

Obturation technique class II ideal matrix requirements? (3)

A
  • Reproduce the anatomical contour
  • Give an adequate contact point
  • Be stable and rigid to support the condensation forces
46
Q

Obturation technique class II types? (2)

A
  • circumferential

- sectional

47
Q

Obturation technique class II circumferential? (2)

A

. Toffle meire Portamatrix + metallic matrix(5 mm)

.Automatrix

48
Q

Obturation technique class II sectional? (2)

A

. Piece of matrix and burnishing

.Palodent systems

49
Q

Obturation technique class Ii? (6)

A
ü METALLIC MATRIX + WOODEN WEDGE
ü ACID ETCHING, RINSING, DRYING, BONDING
ü INCREMENTAL TECHNIQUE
ü LIGHTCURING BY LAYERS
ü FINISHING LIGHTCURING FORM BUCCAL AND LINGUAL (AFTER WE REMOVE THE MATRIX)
ü POLISHING AND OCCLUSAL ADJUSTMENT
50
Q

Obturation technique class III & IV? (7)

A

ü CELLULOSE ACETATE MATRIX + WOODEN WEDGE (IF THERE IS A DIASTEMA, IT IS NOT NECESSARY)
ü ACID ETCHING, RINSING, DRYING, BONDING
ü INCREMENTAL TECHNIQUE
ü LIGHTCURING BY LAYERS
ü FINISHING LIGHTCURING FORM BUCCAL AND LINGUAL (AFTER WE REMOVE THE MATRIX)
ü POLISHING AND OCCLUSAL ADJUSTMENT

If there are 2 adjacent cavities, first we obturate one and then change the matrix of side
and obturate the other