Overview: Learn recommended tissue retraction techniques, such as the double cord method, to optimize digital scan results for crown and bridge procedures.
Primary Retraction Techniques
Digital scans benefit most from adequate tissue retraction. If a user identifies a poor scan chairside, the user should perform a re-scan to achieve optimal results .
Double Cord Technique
The double cord technique is the best option for tissue retraction because the technique increases accessibility and improves tissue displacement.
Pack two knitted cords soaked in a hemostatic material.
Ensure the two knitted cords have different diameters.
Leave the larger cord in place for at least five minutes.
Remove the larger cord immediately before scanning for optimal results.
Single Cord Technique
The single cord technique is an adequate retraction option if the margin remains visible and the tissue does not collapse before the scan.
Soak the single cord in hemostatic material.
Leave the single cord in place for five minutes.
Pull the cord and scan immediately for optimal results.
Alternative and Non-Recommended Methods
Laser Gingivectomy
Laser gingivectomy is more effective for retraction than the sole use of retraction paste but remains less suitable for digital dentistry. Laser use carries a risk of tissue scarring and lacks the mechanical traction provided by retraction cords.
Retraction Paste
Retraction paste is not suitable for crown and bridge digital scans. Retraction paste lacks mechanical retraction and commonly introduces artifacts into the scan. These artifacts lead to washed margins and suboptimal digital scan quality.