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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
Indications for composite resin? (8)
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
Contraindications for composite resin? (2)
Ø Bruxist patients | Ø Inherent characteristics of the composite resins
27
Obturation technique with composites are very sensible to manipulation because... (2)
- Absence of moisture | - Absence of debris (gingival fluid, blood, oil)
28
Instruments needed for the obturation technique with composites? (10)
* 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
Coarse surfaces with the obturation technique may... (2)
retain plaque and color changes
30
How many steps are in the obturation technique?
13
31
Obturation technique step 1 (2)
- Drill caries | - Clean cavity with clorhexidine 0.12%
32
Obturation technique step 2
Clean enamel with cup or brush
33
Obturation technique step 3 (3)
Place matrix if necessary: - Metallic: Class II cavities - Cellulose acetate matrix (plastic matrix): Class III & IV
34
Obturation technique step 4 (3)
- 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
Obturation technique step 5?
Water rinse with pressure for 20 seconds to get rid of acid and loose bits of enamel prisms
36
Obturation technique step 6? (3)
- 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
Obturation technique step 7? (2)
- 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
Obturation technique step 8?
Apply light for 10-15 seconds
39
Obturation technique step 9? (3)
- 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
Obturation technique step 10?
Apply light on each layer of composite for 40 seconds
41
Obturation technique step 11? (2)
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
Obturation technique step 12?
Remove rubberdam and occlusion adjustment with articulation paper
43
Obturation technique step 13?
Polishing
44
Obturation technique class I & V (5)
- NOT NECESSARY TO USE MATRIX - ACID ETCHING, RINSING, DRYING, BONDING - INCREMENTAL TECHNIQUE - LIGHTCURING BY LAYERS - POLISHING (OCCLUSION ADJUSTMENT)
45
Obturation technique class II ideal matrix requirements? (3)
- Reproduce the anatomical contour - Give an adequate contact point - Be stable and rigid to support the condensation forces
46
Obturation technique class II types? (2)
- circumferential | - sectional
47
Obturation technique class II circumferential? (2)
. Toffle meire Portamatrix + metallic matrix(5 mm) | .Automatrix
48
Obturation technique class II sectional? (2)
. Piece of matrix and burnishing | .Palodent systems
49
Obturation technique class Ii? (6)
``` 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
Obturation technique class III & IV? (7)
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

Peds II (11 decks)

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