Elastomeric (Rubber) Impression Materials

Tameyra Stefani Al-Suhairy · 44問 · 1年前

通報

問題一覧

Rim classifications 3

Thermoset, Elastic, Final

Uses 3

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

2 Methods of dispensing

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

3 types

Polysulfide, Silicone, Polyether

the first rubber impression material

Polysulfide RIM

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

vulcanization or curing.

soft or light-bodied base

type 1

regular-bodied base

type 2

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

type 3

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

Type I soft or light-bodied

dibutyl phtalate = controlling viscosity of the rubber

plasticizer

promoter

sulfur

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

catalyst or accelerator

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

Lead dioxide

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

Copper hydroxide

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

Retarder

Manipulation

2-paste type

Working time Polysulfide RIM

5-7 minutes

Setting time: 25C silicone rim

8-12 minutes

Setting time: 37C

4-6 minutes

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

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

Condensation, Addition (vinyl)

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

Silica

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

The base material is a paste

Condensation

a low-molecular weight silicone liquid

dimethylsiloxane

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

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

Addition

3 base Addition type:Silicone RIM

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

increases the accuracy of the impression.

putty-wash system

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

Disadvantages: short working time and high stiffness.

Polyether RIM

Composition: base & catalyst system

Polyether RIM

3 Polyether RIM The base material contains:

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

3 Polyether RIM The accelerator material contains:

alkyl-aromatic sulfonate, Filler, plasticizer

Polyether RIM

Polyether RIM Methods of impression making: 3

Single impression technique, Double impression technique, Syringe technique

base and catalyst mixed

Single impression technique

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

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

Polyether RIM

A drop or two of ____ will retard curing.

oleic acid

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

polysulfide RIM

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

accelerator

Polysulfide 3

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

Condensation / addition silicone

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

the most accurate impression material.

Condensation / addition silicone

Polyether 3

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

Addition silicone

0.1%

Polyether RIM

0.2-0.4%

Condensation silicone

0.6%

Polysulfide RIM

0.3-0.4% during first 24 hour

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

dimensional stability

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

Excellent elasticity

(polysulfide & polyether)

2-paste type

Paste-liquid type

Silicone

Lead dioxide Copper hydroxide Retarder

Polysulfide RIM

Manipulation: 2-paste type

Polysulfide RIM

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

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

Polysulfide RIM

The mixing should be accomplished in 45 seconds.

Polysulfide RIM

Silicone RIM

Polyether RIM

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