How long does PVS impression last?

[MrGoOrange]

Dental student here. I took a final PVS impression for a crown a couple weeks ago (!!!) and I was ready to send it out to the lab, but it turns out the patient's medicaid was put on hold earlier that week.
It took a couple weeks before it to become active again, and then an extra week to process the order to the lab.
I asked faculty if I could send out a (now) 3 week old PVS impression out to the lab. They told me "they are fine for about 6 weeks".
I've searched for any articles and could only find that PVS impressions are dimensionally stable for 1 week.

How long do you guys keep PVS impressions before you take it over again? I can't find any clear literature on this. All the faculty I have asked said that it should be fine for several weeks. A classmate of mine held on to PVS impressions for a several weeks too (for invisalign case).
I hope my crown comes back accurate. But even if it does, looking forward, should I retake future final PVS impressions.

Here's a clinical pic of my crown prep!

Thanks! Any feedback would be greatly appreciated!

---

Members don't see this ad.

 

[THS]

Nice photo! Is that edentulous space just 1 tooth or is it completely edentulous posterior to the prepped tooth? Just a crown or a bridge? Assuming not a survey crown because no rest seat is prepped.

I have heard most professors say about 3-4 weeks is good enough.

 

[dyesht]

damn is that plaque? let's get that in control before placing a crown!

 

[MrGoOrange]

damn is that plaque? let's get that in control before placing a crown!

I was considering cropping out the incisors Patient was referred to PG-Perio for perio maintenance. I was given the ok to prep because his cleaning was scheduled for later that week.

 

[Screwtape]

damn is that plaque? let's get that in control before placing a crown!

lol this guy. I agree though, I'm surprised the prof didn't jump all over that.

 

[MrGoOrange]

Nice photo! Is that edentulous space just 1 tooth or is it completely edentulous posterior to the prepped tooth? Just a crown or a bridge? Assuming not a survey crown because no rest seat is prepped.

I have heard most professors say about 3-4 weeks is good enough.

Patient elected for implants for missing #30 and nonrestorable #31 (EXT)!!

Thanks! I had a lot of fun taking pics. Heres another of my temp. I cemented with tempbond and used luxatemp. I didn't have study models so used a quadrant tray and took a blu-mousse impression of my prep. Then I used an acrylic bur to carve out the crown in the impression. --> Then I filled it with luxatemp, added some anatomy and...

It was my first time using this method, but it worked. Contact and occlusion was good. I made a mess with the tempbond though But since then I've learned if I add some vaseline to the surface of the crown before tempbonding = easier and cleaner cleanup


Here's

shade match too!

I'm going with a ips e.max ceramic crown!

 

[punosay]

Then I used an acrylic bur to carve out the crown in the impression. --> Then I filled it with luxatemp, added some anatomy and...

 

[FatherOrangeJuice]

Looks good, nice job!

About how long the PVS impressions last... I'm convinced they basically never go bad....

One of our professors said 1 week max but I don't believe that because I've poured one up three times over the span of 3 months and all the casts occlude properly.