Why is it essential to place a post dam into an edentulous maxillary denture?
The relevance is for the retention of the maxillary complete denture. The retention and stability that is achieved from adhesion, cohesion and interfacial surface tension are able to resist only those dislodging forces that act perpendicular to the denture base. ............... The duration of the time that the partial vacuum acts on the tissue is extremely small and consequently little or no irreversible alterations to the underlying mucosa will take place.
Check Winkler for the bit in between
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