Polysulfide impression material:
- a- Should be poured within 1 hour. ***
- b- Can be poured after 24 hours.
- c- Can be poured 6-8 hours.
That's correct! Option a, should be poured within 1 hour, is the ideal timeframe for pouring polysulfide impression material.
Here's why the other options aren't ideal:
b. Can be poured after 24 hours:
This is way too long. Polysulfide impressions start to shrink and distort after a few hours, so waiting 24 hours would result in an inaccurate impression.
c. Can be poured 6-8 hours:
While technically possible in some cases, it's still pushing the limit. Ideally, you want to pour your polysulfide impression as soon as possible to avoid any potential for distortion.
Here are some additional things to keep in mind when working with polysulfide impression material:
- Mixing ratio:
Be sure to mix the material according to the manufacturer's instructions. An incorrect ratio can affect the setting time and accuracy of the impression.
- Working time:
Polysulfide has a relatively short working time compared to other impression materials, so you need to work quickly once you mix it.
- Setting time:
The setting time for polysulfide can vary depending on the brand and the temperature, but it's typically around 8-12 minutes.
Disinfection: Always disinfect your impression before pouring the stone model.
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