Overview: Learn how to perform the scanning workflow for implant-supported overdentures from existing prostheses using Dandy Chairside software.
Clinical Scanning Scenarios
Use this workflow when a patient has an existing complete denture and newly-placed implants ready to restore.
Use this workflow when a patient has an existing complete implant-retained overdenture.
Required Scan Selection
The required scan data depends entirely on the number of arches being fabricated.
Single Arch Overdenture Scans
Capture an extraoral 360-degree scan of the existing reference denture.
Capture an intraoral scan of the opposing arch.
Capture two intraoral bite scans from the molar to the midline.
Dual Arch Overdenture Scans
Capture an extraoral 360-degree scan of the existing upper reference denture.
Capture an extraoral 360-degree scan of the existing lower reference denture.
Capture two intraoral bite scans from the molar to the midline.
Extraoral Lower Denture Scanning
Follow the strict scanning sequence: intaglio surface, peripheral borders, occlusal surface, and cameo surface.
Begin scanning on the intaglio surface of the lower denture.
Move the scanner from the intaglio surface toward the peripheral border using a rocking motion, then roll back toward the intaglio surface. Repeat the rocking motion until the entire peripheral border is captured.
Move the scanner from the buccal border toward the buccal and facial tooth surfaces, then roll back toward the peripheral border. Repeat this motion until the scanner captures all buccal and facial surfaces.
Move the scanner from the buccal tooth surface to the occlusal surface, then to the lingual tooth surfaces, and roll back toward the occlusal surface. Repeat the sequence until the scanner captures all anatomical tooth surfaces.
Evaluate the lower denture scan for missing data and rescan any incomplete areas.
Extraoral Upper Denture Scanning
Follow the strict scanning sequence: intaglio surface, peripheral borders, occlusal surface, and cameo surface.
Begin scanning on the intaglio surface of the upper denture. Slowly sweep the scanner from side to side to scan the majority of the palate.
Move the scanner from the intaglio surface over the peripheral border using a rocking motion, then roll back toward the intaglio surface. Repeat this rocking motion until the entire peripheral border is captured.
Move the scanner from the buccal border toward the buccal and facial tooth surfaces, then roll back toward the peripheral border. Repeat this process until all buccal and facial surfaces are captured.
Move the scanner from the buccal tooth surface to the occlusal surface, then to the lingual tooth surfaces, and roll back toward the occlusal surface. Repeat this process until the scanner captures all anatomical tooth surfaces.
Evaluate the upper denture scan for missing data and rescan any incomplete areas.
Extraoral 360 Scanning Tips
Hold the prosthesis in your non-dominant hand and hold the scanner wand in your dominant hand.
Manipulate the scanner wand and the denture simultaneously during the scanning process.
Look primarily at the software screen during scanning, and look down at the denture intermittently as needed.
Pause the scanner frequently to evaluate the scan data for discrepancies or distortion.
Start scanning on a previously captured area when restarting the scanner wand. Allow the scanner to recognize the existing data before moving slowly toward missing data areas.
Evaluate the 360-degree scans using the stone view mode for clearer visualization of distortions.
Use the twist technique to scan any deep undercuts located on the flanges.
Intraoral Bite Scan Procedure
Place the reference dentures back into the patient's mouth.
Apply blue bite registration material to set the bite and prevent denture movement during scanning.
Instruct the patient to remain still and avoid shifting the bite position.
Start scanning on the posterior teeth and slowly wave the scanner wand up and down to capture at least 2 to 3 millimeters of the vestibule.
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Select the "Next Bite" option on the software screen and repeat the scanning procedure for the second bite scan.
Note: If the bite scans do not automatically align, manually align the arch scans or select "Reset" to repeat the bite scan.
Scan Review and Submission
Review the completed scans and verify accuracy before submitting the order.
Confirm that the patient's occlusion is correct in the software view.
Confirm that the scans show no distortion or missing data.
Use the Stone tool to evaluate the scans for data distortion and missing areas.
Use the Annotate scans tool to edit screenshots and send notes directly to the designer.
Select the re-scan option if a scan shows defects or distortion.
Select the "Start Ordering" option if the scan data is accurate and complete.