I was posted the original question. After years of dealing with this
problem, and days of laboring over what is different, I think I have
come up with a few thoughts.
First, the new burs are vertically cut, and very fine. My conclusion
is they are not design to remove very much metal. When I looked at my
older burs they are cut on an slant, which seems to help in removing
the metal, in addition, they do not have as many cutting edges.
So, yesterday, I started by pre-cutting seats with a smaller bur, so
I removed some of the metal with a smaller bur, then used the final
bur to cut the desired seat. Although the newer finer burs still
suck, this worked. Here I am taking two step for what should be a one
Yesterday I order yet another batch of burs based on the very
unenthusiastic advice of a tech at Stuller. I will let you know if
this style works any better. I also order more burs from Rio.
Brand new burs that haven’t worked are:
Lynx by Meisinger made in Germany
Dentsply Maillefer made in Switzerland
I am using a Foredom Micromotor to cut the seats.
I have a question for you, are you using 22K tubing? I only work in
22K, but I can no longer find a supplier for 22K tubing, if you are
working in 22K who are you getting your tubing from? I had to order
10ft of tubing, all the same size, that I had no say in wall
thickness or diameter in order to obtain said tubing. With 10 feet of
22K tubing on hand you can see why I am desperate to make the tube
Thanks in advance for your feedback…