HonestAbe
Member
Full Member
- Messages
- 367
- Reaction score
- 0
The Problem: I design and mill zirconia crowns, they get sintered, and when placed on the single dies we print, it looks like the crown is too big. Turns out they're fine in the mouth, but for whatever reason these single dies seem to be coming out wrong. I'm trying to pinpoint why but I can't figure it out.
We know the scan files aren't corrupted because we're designing on them and the crowns are coming out the right size. I took the raw .stl from a scan, made my own die, printed it on different printers (Form 2 at work and my own Anycubic Photon S at home). I compared those dies to ones that had been through Sirona's model app (cleans up model, ditches die and makes it removable). The crowns look the same on all of them. The really weird part is that the rest of the model seems fine and accurate. We're checking our interproximal contacts on solid models that we print and those seem fine. If the whole model was distorted or wrong-sized then the other dimensions wouldn't fit our crown.
We print them on rafts with supports but for some of my tests I printed them directly on the build plate and the issue was uniform. I wanted to blame the Sirona software but when I got the same results after cutting them out of the picture completely it made me thing something is going on in the 3d printer side of things. The fact that we have the same issue on two different printers is what's throwing me for a loop. The Form2 can do 25 microns, and my Photon S can to 50 microns. Is there some parameter I might be messing up where the margin tapers down thin enough to be like, not printed?
Apologies in advance if I didn't include enough info, I didn't have the presence of mind to take pictures as I went but I wanted to just throw it out there in case other people have had a similar issue or ideas of different ways I could narrow it down that I haven't thought of yet. Much appreciated!
We know the scan files aren't corrupted because we're designing on them and the crowns are coming out the right size. I took the raw .stl from a scan, made my own die, printed it on different printers (Form 2 at work and my own Anycubic Photon S at home). I compared those dies to ones that had been through Sirona's model app (cleans up model, ditches die and makes it removable). The crowns look the same on all of them. The really weird part is that the rest of the model seems fine and accurate. We're checking our interproximal contacts on solid models that we print and those seem fine. If the whole model was distorted or wrong-sized then the other dimensions wouldn't fit our crown.
We print them on rafts with supports but for some of my tests I printed them directly on the build plate and the issue was uniform. I wanted to blame the Sirona software but when I got the same results after cutting them out of the picture completely it made me thing something is going on in the 3d printer side of things. The fact that we have the same issue on two different printers is what's throwing me for a loop. The Form2 can do 25 microns, and my Photon S can to 50 microns. Is there some parameter I might be messing up where the margin tapers down thin enough to be like, not printed?
Apologies in advance if I didn't include enough info, I didn't have the presence of mind to take pictures as I went but I wanted to just throw it out there in case other people have had a similar issue or ideas of different ways I could narrow it down that I haven't thought of yet. Much appreciated!