Why do dentists love alginate?
Almost every practice I visit uses alginate to take impressions.
Frankly, if you are currently using alginate, then I think you're doing yourself a big disservice.
Please let me go through the problems that I find with alginate:
It's time consuming to get ready
It's messy to mix and leaves a dirty bowl and spatula that must be cleaned
If the quantities of powder and water are not precise (and the quantities are difficult to get right) you either get a bowl of unusable slop or a rubbery mass that sets before you can get it in the patient's mouth
If the water is warm it sets like lightening or if the water is icy cold it takes ages to set
It's messy and crumbly in the patient's mouth and most people hate it
Once set it must be kept moist and poured promptly or else to will distort and produce an inaccurate model
If left on the model too long it dries out and will break the model during removal
It can only be poured once. If that model gets ruined then there is no way to try again
Alginate does have one virtue. It's relatively cheap.
Putting up with all those problems just to save a couple of dollars for each impression is false economy.
PVS materials have none of the drawbacks mentioned above. They're well tolerated by patients, quick, clean, easy, consistent, forgiving and reliable.
With a wall-mounted automatic mixer that contains a material such as Alginot or Position Penta Quick producing a PVS impression takes only seconds.
If we'd had PVS materials for years and alginate were invented today I think that alginate would be rejected as being a hopeless material. It's just that most dentists grew up with alginate and have become used to its many failings.