Digital Impressions

Fig. 11.1

Color virtual model
Fig. 11.2

Monochromatic virtual model
  • Open and closed systems.

    • Open – digital impression file (usually .stl file) can be imported into other software programs for design and restoration fabrication.
    • Closed – digital impression file stays within the same software system for design and restoration fabrication.
  • Most systems employ continuous image capture or true video during the scanning process.
  • Proven accuracy (Ahrberg 2016).
  • Secure virtual submission (Digital Dental Exchange 2016).

      11.1.1 Capabilities of Intraoral Scanners

      • Magnified image and ability to zoom allow better visualization of tooth preparation (Fig. 11.3).

        Fig. 11.3

        Magnified view of preparation
      • Occlusal clearance indicated with color-coded ranges so that the dentist can evaluate the need for additional reduction (Fig. 11.4).

        Fig. 11.4

        Occlusal clearance on prepared teeth
      • Ability to verify virtual occlusion is identical to intraoral occlusion.
      • Preparation undercut detection (Fig. 11.5).

        Fig. 11.5

        Undercut detection shown in green
      • Ability to edit and modify impressions.
      • See chapter on Indirect Restorations with CAD/CAM Technology. Advantages

      • Enhanced patient comfort
      • Efficient submission to lab virtually
      • Improved lab communication – ability to include pictures, mark margins, and annotate on digital impression
      • Retake impressions at no additional cost
      • Reduction of necessary components for implant impressions Disadvantages

      • Learning curve associated with initial use
      • High initial investment and/or recurring additional fees (i.e., licensing fees/click fees)

      11.2 Proper Technique for Imaging

      1. (a)
        Avoid redundancy during scanning – increases accuracy and decreases file size (i.e., begin scanning occlusal surfaces on the most posterior tooth, moving to the anterior; rotate to capture the lingual surfaces and move from anterior to posterior; rotate over tooth to capture buccal surfaces and move anteriorly; end on an occlusal surface) (Fig. 11.6).

    • Dec 11, 2016 | Posted by in General Dentistry | Comments Off on Digital Impressions
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