polyether impression material (copy)

intro, composition, and properties

1960s

when was polyether impression developed

very hard

consistency of polyether material

mechanical properties

polyether offers the possible combination of BETTTER [?] than polysulfides

less dimensional change

polyether offers [?] than silicone impression

base paste and accelerator paste

composition of polyether impression material

→  amine terminated polymer(polyether)

→ colloidal silica (filler)

→  glycol ether or phthalate

composition of base paste

→ alkyl aromatic sulfonate

→ colloidal silica (filler)

→  plasticizers (glycoether)

composition of accelerator paste

colloidal silica

filler of base paste

colloidal silica

filler of accelerator paste

SETTING TIME

MIXING TIME

DIMESIONAL STABILITY

DECREASED FLEXIBILITY

HYDROPHILIC

ACTIVATOR PASTE

TEAR STRENGTH

SHELF LIFE

PROPERTIES of polyether

8 min

setting time of polyether

30 secs

mixing time of polyether

good

dimensional stability of polyether

3%

decreased flexibility of polyether

can interact with water

what does hydrophilic mean

activator paste

can produce allergy if handled frequently

allergy

activator paste can produce [?] if handled frequently

3000gm/cm

tear strength of polyether

> 2 years

shelf like of polyether