The Final Impression

The final impression records the exact contours of the denture-bearing area and delineates the extent and shape of the denture borders.

Armamentarium for the zinc oxide-eugenol impression includes:

• Straight angle carbide acrylic trimming burs
  
• No. 6 round bur
  
• Alcohol torch
  
• Stick compound
  
• Petroleum jelly
  
• Cold water
  
• Lab knife
  
• Zinc oxide-eugenol impression paste
• Mixing pad
• Two spatulas

Making the Final Maxillary Impression

Check the tray in the mouth. A properly made maxillary tray will:

• Be stable
  
• Permit free movement of the lips, cheeks, frena, and movable areolar tissue adjacent to the borders of the tray
  
• Not blanch tissues
  
• Not be displaced when the lips are retracted gently or upon movements of the mandible.