Casting Failures & Defects In Dentistry
It is also known as hot spot porosity. This occurs at the sharp occlusoaxial or incisoaxial line angle. It is mainly seen as an external void inside of a crown opposite sprue.
Cause Of Suck Back Porosity:
Molten metal alloy impinging on the mold wall near the sprue, the hot spot caused in this region and freezes last. Since the sprue has already solidified, no more molten alloy is available and the resulting shrinkage causes suck-back porosity.
Remedies Cause Of Suck Back Porosity:
- Flaring of the point of sprue attachment.
- By reducing the temperature difference between the mold and the molten alloy.
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