Setting reaction + Properties of Polysulfide

setting reaction + properties

condensation polymerization reaction

polysulfide materials are set by?

hydrogen, hydroxyl group, monomers, water

condensation polymerization happens when a [?] atom and [?] group are TAKEN from the [?] and are COMBINED to form [?]

SETTING TIME

PERMANENT DEFORMATION

DIMESIONAL STABILITY

FLEXIBILITY

TEARING STRENGTH

FLOW

properties of polysulfide impression material

7 mins

setting time of light bodied

5 mins

setting time of regular bodied

5 mins

setting time of heavy bodied

decreases, stiffer

general working time [?] as the consistency becomes [?]

8-12 mins

final setting time

2.7%

permanent deformation of light bodied

2.1%

permanent deformation of regular bodied

3%

permanent deformation of heavy bodied

permanent deformation

indicates that the material is NOT PERFECTLY ELASTIC

not perfectly elastic

permanent deformation indicates that the material is?

permanent deformation

implies that COMPRESSION during removal of the impression material should be kept to a MINIMUM.

0.13%

dimensional stability of light bodied

0.25%

dimensional stability of regular bodied

0.22%

dimensional stability of heavy bodied

shrinks, .1%, .3%

dimensional stability shows that the impression [?] from [?] to [?]

first 24 hrs

time frame of shrinking (dimensional stability)

prepared promptly

because of shrinking, models and dies should be?

10%

flexibility of light bodied

7%

flexibility of regular bodied

5%

flexibility of heavy bodied

satisfactory, clinical

materials having flexibility values of 2 to 20% are believe to be [?] for [?]

2% - 20%

flexibility values that are satisfactory for clinical use

35 lbs/in (6300 g/cm)

tearing strength of polysulfide impression

0.9%

flow of light bodied

0.5%

flow of regular bodied

0.3%

flow of heavy bodied