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Elastomeric (Rubber) Impression Materials
67問 • 1年前
  • Tameyra Stefani Al-Suhairy
    • 通報

    問題一覧

  • 1

    Rim classifications 3

    Thermoset, Elastic, Final

  • 2

    Uses 3

    single impression, used for quadrant impression, bite registration (addition silicone)

  • 3

    2 Methods of dispensing

    2-paste type (polysulfide & polyether), Paste-liquid type (silicone)

  • 4

    3 types

    Polysulfide, Silicone, Polyether

  • 5

    the first rubber impression material

    Polysulfide RIM

  • 6

    The process of changing the rubber base product, or liquid polymer, to a rubber-like material is generally known as

    vulcanization or curing.

  • 7

    soft or light-bodied base

    type 1

  • 8

    regular-bodied base

    type 2

  • 9

    heavy-bodied, depending on their viscosity and how easily they flow under load.

    type 3

  • 10

    used as a syringe material in combination with a tray material. denture impressions with a custom-made tray.

    Type I soft or light-bodied

  • 11

    dibutyl phtalate = controlling viscosity of the rubber

    plasticizer

  • 12

    promoter

    sulfur

  • 13

    contains a compound that causes the mercaptan groups to react to form a polysulfide rubber.

    catalyst or accelerator

  • 14

    the most common catalyst; using it results in the paste being dark brown to dark gray

    Lead dioxide

  • 15

    and when mixed with the white base paste, a blue- green color results

    Copper hydroxide

  • 16

    controls the rate of setting time ; oleic acid, stearic acid (controls polymerization of rubber) , castor oil (controls reaction of the 2 pastes)

    Retarder

  • 17

    Manipulation

    2-paste type

  • 18

    Working time Polysulfide RIM

    5-7 minutes

  • 19

    Setting time: 25C silicone rim

    8-12 minutes

  • 20

    Setting time: 37C

    4-6 minutes

  • 21

    Silicone RIM 5

    Objectionable odor, Staining of linens and uniforms by lead dioxide, Amount of effort required to mix and long setting times, Moderately high shrinkage on setting, High permanent deformation

  • 22

    Silicone RIM Composition: 2 types of silicone are used (according to polymerization reaction)

    Condensation, Addition (vinyl)

  • 23

    added to give the proper consistency to the paste and stiffness to the set rubber

    Silica

  • 24

    The silicone pastes have 4 types of consistency, same as the polysulfide pastes. As well as a very heavy consistency as Type IV called

    Putty

  • 25

    The base material is a paste

    Condensation

  • 26

    a low-molecular weight silicone liquid

    dimethylsiloxane

  • 27

    The accelerator is supplied as a liquid which consists of: 2 silicone rim

    tin organic ester suspension, alkyl silicate such as ortho-ethyl silicate = acts as a cross-linking agent

  • 28

    The material is supplied as a two-paste or a two-putty system

    Addition

  • 29

    3 base Addition type:Silicone RIM

    polymethyl hydrogen siloxane or divinyl polymethyl siloxane, reinforcing fillers, chloroplatinic acid catalyst

  • 30

    increases the accuracy of the impression.

    putty-wash system

  • 31

    offer the possible combination of better mechanical properties than those of the polysulfides along with less dimensional change than those of condensation silicone materials.

    Polyether RIM

  • 32

    Disadvantages: short working time and high stiffness.

    Polyether RIM

  • 33

    Composition: base & catalyst system

    Polyether RIM

  • 34

    3 Polyether RIM The base material contains:

    polyether polymer, colloidal silica as filler, plasticizer such as glycol ether phtalate

  • 35

    3 Polyether RIM The accelerator material contains:

    alkyl-aromatic sulfonate, Filler, plasticizer

  • 36

    Polyether RIM

  • 37

    Polyether RIM Methods of impression making: 3

    Single impression technique, Double impression technique, Syringe technique

  • 38

    base and catalyst mixed

    Single impression technique

  • 39

    paste-putty system; preliminary impression using putty followed by a wash impression (thinner consistency) placed on top of putty as second or corrective impression.

    Double impression technique

  • 40

    light-bodied + catalyst material injected into prepared tooth then followed by a secondary (regular body + catalyst) paste impression for a more accurate detailed impression with no bubbles. Ideal for laminates.

    Syringe technique

  • 41

    Polyether RIM

  • 42

    A drop or two of ____ will retard curing.

    oleic acid

  • 43

    change in the ratio of accelerator paste to the base paste is not recommended for

    polysulfide RIM

  • 44

    Delay of curing can be achieved by reducing amount of ___ to base

    accelerator

  • 45

    Polysulfide 3

    long working & setting time, moderately high permanent deformation and flow, high flexibility

  • 46

    Condensation / addition silicone

    short working & setting time, moderate flexibility and tear strength, very low shrinkage on setting flow

  • 47

    the most accurate impression material.

    Condensation / addition silicone

  • 48

    Polyether 3

    short working & setting time, low tear strength, very stiff

  • 49

    Addition silicone

    0.1%

  • 50

    Polyether RIM

    0.2-0.4%

  • 51

    Condensation silicone

    0.6%

  • 52

    Polysulfide RIM

    0.3-0.4% during first 24 hour

  • 53

    very low shrinkage in RIM which makes them much more stable dimensionally than hydrocolloids.

    dimensional stability

  • 54

    The polysulfide are allowed 4% & silicones 2% permanent deformation after a 12 % strain is held for 30 seconds.

    Excellent elasticity

  • 55

    (polysulfide & polyether)

    2-paste type

  • 56

    Paste-liquid type

    Silicone

  • 57

    Lead dioxide Copper hydroxide Retarder

    Polysulfide RIM

  • 58

    Polysulfide RIM

  • 59

    Manipulation: 2-paste type

    Polysulfide RIM

  • 60

    Polysulfide RIM

  • 61

    Polysulfide RIM The base material consists of :

    80% polysulfide polymer or polyfunctional mercaptan (-SH), sulfur = promoter, plasticizer - dibutyl phtalate, . 20% reinforcing agents - for strength, prevent tearing = titanium dioxide, zinc sulfate, copper carbonate, or silica

  • 62

    The accelerator is mixed with the base for 5-10 seconds in a circular motion with the end of the spatula.

    Polysulfide RIM

  • 63

    The mixing should be accomplished in 45 seconds.

    Polysulfide RIM

  • 64

    Silicone RIM

  • 65

    Polyether RIM

  • 66

    Polyether RIM

  • 67

    Polyether RIM

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    問題一覧

  • 1

    Rim classifications 3

    Thermoset, Elastic, Final

  • 2

    Uses 3

    single impression, used for quadrant impression, bite registration (addition silicone)

  • 3

    2 Methods of dispensing

    2-paste type (polysulfide & polyether), Paste-liquid type (silicone)

  • 4

    3 types

    Polysulfide, Silicone, Polyether

  • 5

    the first rubber impression material

    Polysulfide RIM

  • 6

    The process of changing the rubber base product, or liquid polymer, to a rubber-like material is generally known as

    vulcanization or curing.

  • 7

    soft or light-bodied base

    type 1

  • 8

    regular-bodied base

    type 2

  • 9

    heavy-bodied, depending on their viscosity and how easily they flow under load.

    type 3

  • 10

    used as a syringe material in combination with a tray material. denture impressions with a custom-made tray.

    Type I soft or light-bodied

  • 11

    dibutyl phtalate = controlling viscosity of the rubber

    plasticizer

  • 12

    promoter

    sulfur

  • 13

    contains a compound that causes the mercaptan groups to react to form a polysulfide rubber.

    catalyst or accelerator

  • 14

    the most common catalyst; using it results in the paste being dark brown to dark gray

    Lead dioxide

  • 15

    and when mixed with the white base paste, a blue- green color results

    Copper hydroxide

  • 16

    controls the rate of setting time ; oleic acid, stearic acid (controls polymerization of rubber) , castor oil (controls reaction of the 2 pastes)

    Retarder

  • 17

    Manipulation

    2-paste type

  • 18

    Working time Polysulfide RIM

    5-7 minutes

  • 19

    Setting time: 25C silicone rim

    8-12 minutes

  • 20

    Setting time: 37C

    4-6 minutes

  • 21

    Silicone RIM 5

    Objectionable odor, Staining of linens and uniforms by lead dioxide, Amount of effort required to mix and long setting times, Moderately high shrinkage on setting, High permanent deformation

  • 22

    Silicone RIM Composition: 2 types of silicone are used (according to polymerization reaction)

    Condensation, Addition (vinyl)

  • 23

    added to give the proper consistency to the paste and stiffness to the set rubber

    Silica

  • 24

    The silicone pastes have 4 types of consistency, same as the polysulfide pastes. As well as a very heavy consistency as Type IV called

    Putty

  • 25

    The base material is a paste

    Condensation

  • 26

    a low-molecular weight silicone liquid

    dimethylsiloxane

  • 27

    The accelerator is supplied as a liquid which consists of: 2 silicone rim

    tin organic ester suspension, alkyl silicate such as ortho-ethyl silicate = acts as a cross-linking agent

  • 28

    The material is supplied as a two-paste or a two-putty system

    Addition

  • 29

    3 base Addition type:Silicone RIM

    polymethyl hydrogen siloxane or divinyl polymethyl siloxane, reinforcing fillers, chloroplatinic acid catalyst

  • 30

    increases the accuracy of the impression.

    putty-wash system

  • 31

    offer the possible combination of better mechanical properties than those of the polysulfides along with less dimensional change than those of condensation silicone materials.

    Polyether RIM

  • 32

    Disadvantages: short working time and high stiffness.

    Polyether RIM

  • 33

    Composition: base & catalyst system

    Polyether RIM

  • 34

    3 Polyether RIM The base material contains:

    polyether polymer, colloidal silica as filler, plasticizer such as glycol ether phtalate

  • 35

    3 Polyether RIM The accelerator material contains:

    alkyl-aromatic sulfonate, Filler, plasticizer

  • 36

    Polyether RIM

  • 37

    Polyether RIM Methods of impression making: 3

    Single impression technique, Double impression technique, Syringe technique

  • 38

    base and catalyst mixed

    Single impression technique

  • 39

    paste-putty system; preliminary impression using putty followed by a wash impression (thinner consistency) placed on top of putty as second or corrective impression.

    Double impression technique

  • 40

    light-bodied + catalyst material injected into prepared tooth then followed by a secondary (regular body + catalyst) paste impression for a more accurate detailed impression with no bubbles. Ideal for laminates.

    Syringe technique

  • 41

    Polyether RIM

  • 42

    A drop or two of ____ will retard curing.

    oleic acid

  • 43

    change in the ratio of accelerator paste to the base paste is not recommended for

    polysulfide RIM

  • 44

    Delay of curing can be achieved by reducing amount of ___ to base

    accelerator

  • 45

    Polysulfide 3

    long working & setting time, moderately high permanent deformation and flow, high flexibility

  • 46

    Condensation / addition silicone

    short working & setting time, moderate flexibility and tear strength, very low shrinkage on setting flow

  • 47

    the most accurate impression material.

    Condensation / addition silicone

  • 48

    Polyether 3

    short working & setting time, low tear strength, very stiff

  • 49

    Addition silicone

    0.1%

  • 50

    Polyether RIM

    0.2-0.4%

  • 51

    Condensation silicone

    0.6%

  • 52

    Polysulfide RIM

    0.3-0.4% during first 24 hour

  • 53

    very low shrinkage in RIM which makes them much more stable dimensionally than hydrocolloids.

    dimensional stability

  • 54

    The polysulfide are allowed 4% & silicones 2% permanent deformation after a 12 % strain is held for 30 seconds.

    Excellent elasticity

  • 55

    (polysulfide & polyether)

    2-paste type

  • 56

    Paste-liquid type

    Silicone

  • 57

    Lead dioxide Copper hydroxide Retarder

    Polysulfide RIM

  • 58

    Polysulfide RIM

  • 59

    Manipulation: 2-paste type

    Polysulfide RIM

  • 60

    Polysulfide RIM

  • 61

    Polysulfide RIM The base material consists of :

    80% polysulfide polymer or polyfunctional mercaptan (-SH), sulfur = promoter, plasticizer - dibutyl phtalate, . 20% reinforcing agents - for strength, prevent tearing = titanium dioxide, zinc sulfate, copper carbonate, or silica

  • 62

    The accelerator is mixed with the base for 5-10 seconds in a circular motion with the end of the spatula.

    Polysulfide RIM

  • 63

    The mixing should be accomplished in 45 seconds.

    Polysulfide RIM

  • 64

    Silicone RIM

  • 65

    Polyether RIM

  • 66

    Polyether RIM

  • 67

    Polyether RIM