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opd 2 > Composite > Flashcards

Composite Flashcards

1
Q

Tooth-colored materials, such as composite, are
used in almost all types and sizes of restorations.

A

Composite

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2
Q

What are the causes of esthetic restoration failures?

A

*Trauma
*Improper tooth preparation
*Inferior materials
*Misuse of dental materials

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3
Q

What are the two types of Esthetic restorative materials?

A

Inlays and Onlays

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4
Q

An indirect restoration, fabricated in dental laboratories. These are fabricated using sophisticated computer-aided design/computer-assisted machining (CAD/CAM).

A

Inlays and Onlays

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5
Q

*It is the first translucent filling material
*Introduced in 1871
*Alumina-silica glass & phosphoric acid
*Very soluble
*Poor mechanical properties

A

Silicate Cement

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6
Q

True or False: Failed silicate cement restorations display loss of contour of tooth.

A

True

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7
Q

It is an early acrylic material characterized having poor activator systems, high polymerization shrinkage, high coefficient of thermal expansion, and lack of abrasion resistance.

A

Acrylic Resin

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8
Q

It is introduced commercially in 1962 by Boen of the National Bureau of Standards. It is the most popular tooth-colored material.

A

Composite

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9
Q

What are the composition of Composite?

A

*Organic Resin
*Inorganic Resin
*Coupling Agent (Silane)
*Initiator system
*Stabilizers / Inhibitors

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10
Q

Composition of Composite:
* It forms the matrix.
* Typically consists of a resin-based oligomer matrix, such as a bisphenol-A glycidyl methacrylate (Bis-GMA) or urethane dimethacrylate (UDMA).

A

Organic Resin

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11
Q

Composition of Composite:
* Inhibits deformation of the matrix.
* Reduces the coefficient of thermal expansion of the resin matrix.
* Gives the composite wear resistance and translucency.
e.g. fused silica, crystalline quartz, lithium aluminum silicate, borosilicate glass

A

Inorganic Resin

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12
Q

Composition of Composite:
* Unite the resin with the filler
* Stress absorber of the filler and resin

A

Coupling agent

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13
Q

Composition of Composite:
* Activate the setting mechanism
* Begins the polymerization reaction of the
resins when external energy (light/heat,
etc.) is applied.

A

Initiator system

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14
Q

Composition of Composite:
* Resins require stabilizers to avoid spontaneous polymerization.
* Stabilizers are also used to control the reaction of activators and resin mixtures.
* Hydroquinone is most commonly used as
a stabilizer.

A

Stabilizer / Inhibitors

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15
Q

What are the 4 classification of composites based on filler particle size?

A

Macrofill, Microfill, Hybrid, Nanofill

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16
Q

What are the 2 classification of composite based on viscosity?

A

Packable and Flowable

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17
Q

What are the 6 properties of composite?

A

1.Linear Coefficient of Thermal Expansion
2.Water Sorption
3.Wear Resistance
4.Surface Texture
5.Radiopacity
6.Modulus Elasticity

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18
Q

Classification of Composite based on filler particle size:
* Contains 75-80% inorganic filler by weight.
* Average particle size 8µm.
* Large size particle and extremely hard filler.
* Rough surface structure strontium and barium glass (radiopaque).
* Due to large particle size, macrofills are not very polishable.
* Prone to staining.

A

Macrofill

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19
Q

Classification of Composite based on filler particle size:
* Introduced in the late 1970
* Polishable
* Smooth lustrous surface similar to tooth enamel
* Particle size is 0.01 – 0.04µm
* Contains 35-60% inorganic filler by weight
* Wear resistant
* Low modulus of elasticity (allow restoration to flex)
* High resin content results in an increased coefficient of thermal expansion and lower strength.

A

MIcrofill

20
Q

Classification of Composite based on filler particle size:
* Combines the properties of conventional and microfilled
* Contains 75-85% inorganic filler by weight
* Particle size is 0.4 – 1µm
* Physical properties is superior to conventional
* Predominant direct esthetic resin
* Have universal clinical applicability

A

Hybrid

21
Q

Classification of Composite based on filler particle size:
* Materials that are created by introducing
* nanoparticulates (often referred to as filler) into a macroscopic sample material (often referred to as the matrix).
* Nanofill composites contain filler particles that are extremely small (0.005–0.01 µm).

A

Nanofill

22
Q

Classification of Composite based on viscosity:
* More viscous, “thicker, stiffer feel”
* Have filler particle feature that prevents sliding of the filler particle by one another
* Easier restoration of proximal contact
* Similar to the handling of amalgam

A

Packable

23
Q

Classification of Composite based on viscosity:
* Flows into cavity due to lower viscosity
* Have lower filler content
* Inferior physical properties (lower wear resistance, lower strength)
* Used in small class I, pit and fissure sealant, marginal repair, liner
* Easy to use
* Good wettability
* Favorable handling properties

A

Flowable

24
Q

Property of Composite:
It is the Change in length of a solid material when heated or cooled.

A

Linear Coefficient of Thermal expansion

25
Q

Property of Composite:
* It may stain or enlarge slightly because they absorb moisture.
* It represents amount of water adsorbed on the surface and into the body of the material.

A

Water sorption

26
Q

Property of Composite:
Physiological wear occurs when teeth
occlude or articulate with a non-abrasive material

A

Wear resistance

27
Q

Property of Composite:
It is the surface roughness.

A

Surface texture

28
Q

Property of Composite:
Relative stiffness or rigidity of a material.

A

Modulus elasticity

29
Q

State the contraindications of composite restoration (3).

A

*Inability to isolate the site.
*Excessive masticatory forces.
*Restorations extending to the root surfaces

30
Q

State the indications of composite restoration (7).

A

*Class I, II, III, IV, V & VI restorations.
*Foundations or core buildups.
*Sealant & Preventive resin restorations.
*Esthetic enhancement procedures.
*Luting
*Temporary restorations
*Periodontal splinting.

31
Q

State the advantages of composite restoration (7).

A

*Esthetics
*Conservative tooth preparation.
*Less complex when preparing the tooth.
*Insulative, having low thermal conductivity.
*Used almost universally.
*Bonded to the tooth structure, resulting in good retention, low microleakage.
*Repairable.

32
Q

State the disadvantages of Composite Restoration (5).

A

*May result in gap formation when restoration extends to the root surface.
* Technique sensitive.
* Expensive
* May exhibit more occlusal wear in areas of higher
stresses.
* Higher linear coefficient of thermal expansion

33
Q

It releases fluoride, anticariogenic effect ; possess a
favorable coefficient of thermal expansion.
It is also in contrast to silicate cement which has phosphoric acid, glass ionomers use polyacrylic acid, which renders the restoration less soluble.

A

Conventional Glass Ionomer

34
Q

It is developed in an effort to improve the physical
properties and esthetic qualities of conventional
glass ionomer.

A

Resin-modified Glass ionomer

35
Q

True or False:
The resin component in Resin-modified glass ionomer affords the potential for light-curing, auto-curing, or both.

A

True

36
Q

Types of GIC:
Type I?

A

Luting

37
Q

Types of GIC:
Type II?

A

Restorative

38
Q

Types of GIC:
Type III?

A

Liner/base

39
Q

Types of GIC:
Type IV?

A

Pit and Fissure Sealant

40
Q

Types of GIC:
Type V?

A

Luting for orthodontic purpose

41
Q

Types of GIC:
Type VI?

A

Core buildup material

42
Q

Types of GIC:
Type VII

A

High fluoride releasing command set

43
Q

Types of GIC:
Type VIII?

A

Atraumatic restorative treatment

44
Q

Types of GIC:
Type IX?

A

Pediatric glass ionomer cements

45
Q

It is best described as composites to which some glass-ionomer components have been added. It is primarily light-cured, they are very easy to use and
have gained popularity because of their superb
handling properties.

A

Compomer

opd 2 (3 decks)

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