DentAI – Decoupling With Time (DWT)
فارسیIn dentAI #19. We continue through David Alleman's six-lesson biomimetic series. In this part we discuss DWT (Decoupling With Time).
What is Decoupling With Time (DWT)?
- Description: From the moment IDS is performed, the bond to dentin begins to form and the hybrid layer begins to mature. Bond strength does not reach its maximum potential immediately; rather, it needs time to develop.
- Studies have shown that the dentin bond reaches 90% of its final strength after 5 minutes.
Steps after IDS
- After placing the IDS, a resin coating (RC) layer can be applied.
- This is usually done with a periodontal probe, taking care that the RC is spread uniformly with a thickness of 0.5 mm over the dentin and the DEJ (the dentino-enamel junction).
- During polymerization, the resin coating layer moves toward the forming hybrid layer.
The importance of DWT
- By giving the dentin bond enough time for Decoupling With Time (DWT), the bond is allowed to reach its maximum strength without being pulled by the faster enamel bond.
Benefits of DWT
- It allows the dentin bond to reach its maximum strength in a stress-free environment, and this helps overcome the potential problems related to the Hierarchy of Bondability.
- If a direct restoration is being performed, the dentin bond should remain in a stress-free environment for at least 5 minutes so that the hybrid layer has enough time to mature.
Tasks that can be done during these 5 minutes
- During these 5 minutes, other tasks can be performed, including:
- Managing C-Factor stresses using fiber inserts: Fibers can help reduce the stresses caused by polymerization shrinkage (C-Factor).
- Performing Deep Margin Elevation (DME): To improve bonding conditions and the marginal seal.
- Building proximal walls: Creating the proximal walls before the final filling of the cavity.