Goals of Final Impressions

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Goals of Final Impressions

• 1.Maximum coverage of denture bearing areas-less
  force/unit area less trauma
• 2.Stabilization of dentures-bracing against
  vertical portion of ridges
• 3.Retention
• Adhesion by contact
• Border seal

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Prepare Trays for Impression

• Remove slight amount of compound from every
  surface, slightly more in frenum areas
• Remove minimal amount from undercuts that will
  still allow for tray seating
• Remove remaining pink wax spacer
• Use round bur to place vent holes
• Coat tray and compound with adhesive

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Impression Material

• Add enough light-bodied PVS to tray so it is
  slightly thicker than the pink wax spacer that
  you have removed
• Use cement spatula to coat the tray evenly, as
  well as over green compound borders
• Rotate tray into mouth and seat to place

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Impression

• Go through border molding movements, hold tray in
  place until PVS is set
• For mandibular impression, start with the lingual
  movements, finishing with the posterior buccal
  movements
• Have patient close to a relaxed position while
  mandibular impression sets

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Verify Results

• Trim away excess PVS, re-seat impression in the
  patients mouth
• Evaluate stability, retention, patient comfort
• Re-mark vibrating line, if needed
• Box and pour impression

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Trimmed Model