Dual scan CBCT Protocol for Fully Edentulous Cases

Philip Segal MDT

What is required for Dual Scan Protocol?

   A full denture /radiographic guide which is radiolucent  & has 6 -8  radiopaque markers  (e.g. Suremark or Gutta Percha)

What is required for Dual Scan Protocol?

  • Place 4 markers in the palate area
  • Place 4 markers on the buccal side between the necks of the denture teeth & the edge of the flange

What is required for Dual Scan Protocol?

  • The tooth set-up should be ideal and represent the final desired result.
  • The correct vertical dimension.
  • In the case of an upper denture it must have full palatal coverage.

What is required for Dual Scan Protocol?

 The full denture /radiographic guide must be stable & close fitting to the soft tissue & have no metal components:

e.g. wire mesh/plate, metallic crowns, wire clasps

It is recommended that the denture has a hard reline.

What is required for Dual Scan Protocol?

  • The geometry of radiographic guide is transferred to the Surgical Template

  • It is essential that the radiographic guide/denture is strong, rigid, reaches the full depth of the sulcus and is stable on the mucosa

Collection of Digital information for fully edentulous cases

  1. Before the CBCT is taken the patient should remove all jewelry & removable appliances with metal components

  2. Please note : when the patient has fixed metal prosthetic components in his/her mouth, this will affect the quality of the CT & may cause unwanted scatter.

CBCT Dual scan protocol for fully edentulous

  • It is recommended to prepare a bite index to stabilize & separate the jaws when scanning the patient only!

  • Apply radiolucent material such as “aquasil” on to the occlusal surface. The patient should not close fully maintaining a small gap of 2-3mm. Trim away excess material.

CBCT Dual scan protocol for fully edentulous

 

 

 

  • Scan the patient wearing the radiolucent denture or scan prosthesis with 8 scan markers
  • To stabilize the denture it is recommended to use a radiolucent bite index

CBCT Dual scan protocol for fully edentulous

 

  • Scan the prosthesis alone in the same orientation as taken in scan 1.

      Ensure to remove the bite index!

 

  • The material used to support the prosthesis must be more radiolucent

      than the prosthesis itself.

       e.g.  polyurethane & polyurethane foam materials

CBCT Dual scan protocol for fully edentulous

Export the raw dicom axial files only

Prepare two separate folders

  • Patient’s name must be present in the Dicom files
  • Variable slice thickness is not allowed
  • Gantry tilt 0ᵒ
  • Only axial images required
  • The scans must be saved as “Dicom” files
  • The files should be “zipped” before upload