D
Dushan
Member
Full Member
- Messages
- 8
- Reaction score
- 2
first of all sory for my bad english i´m from Europe
i started working with metal 3 years ago and never had any problem until recently .
noticed some porosity,cracks and bubbles so i changed metal .
now i´m using Kera N metal and Maruvest microfine investing material and all of my castings are ok but from time to time i noticed porosity like on picture.
problem is that i invest 2,3 bridges and other bridges are solid and perfect cast but third is like this one.so porosity is only on one place around sprue position,but the rest is also solid.
these castings are from two different cases,invested with other bridges which are perfect.
sprue used in these cases are 2,5 for wax structure,4 mm for reservoir and afterwards 3,5 mm .final temperature is 950 for about one hour,casted using a machine.
i´m well awear that metal is not class one material but the thing that bugs me is that other bridges and crown are solid and perfect and invested in same time .
so any ideas???