Good retention of the upper wax rim helps assess the aesthetics accurately

A post dam is cut onto the working upper cast at the start of the registration appointment. The posterior border of the wax rim is warmed and pushed into the post dam on the cast. This ensures that the upper rim has good retention when assessing the aesthetics of the lip support, incisal plane, occlusal plane, centre line and buccal corridors.

Without the post dam on the upper rim, the rim may tend to drop down, making assessing the appearance impossible to judge.

If the anatomy prevents retention, such as extremely flat maxilla a small amount of fixative is used.

Denture Blog 39

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