Opps sorry bout that JMN was a little busy did'nt really reviewed it but i was saying. When your casting some thick crown or implant or bridge you can see the thickest part and that is were I attached a piece of same metal to chill it. this is how i will sprue if this is metal bridge Sorry but I get a solid "HUH?" out of that. can you please try saying that differently? [/QUOTE]
@Yuugen If its working, great. I cringe because Ive had issues even when it seemed I was doing everything correct. Ill let the others be more specific if they choose. I quit doing any metal work, so Ill bow out.
Ill be the first to admit, i dont know what I dont know.
I’ll list a few, beginning with the top of the former, it should be rounded like a button or funnel shaped, not flat. The runner leading to the bar is too small and there probably should be two. I suspect the bar diameter is smaller than the pontic in cross section, it should be larger. The sprue leading to the Pontic is too small and I’d likely use two. I can’t tell if the sprues are connected to the thickest parts of the patterns but they need to be. Most people would add vents, I might or might not, I’ve never really been sold on them. Your connections should all be smoother, sharp angles lead to broken bits of investment included in the casting, usually near the margins. I’d cast it cool, 900 F or so after burning it out at 1300 F. Attaching the dwt at the top is new to me, but interesting. That’s all I’ve got, I just said 8 to keep User up all night wondering what the other two were