Dentsply SDR - Smart Dentin Replacement
Before & After: Click to magnify
SDR is a flowable bulk filler for posterior teeth from Dentsply. It allows light penetration for curing up to 4mm at a time. Polymerisation shrinkage is 3.5%, comparable to other flowables, but less than many hybrid composites. Dentsply claim that the marginal stress caused by polymerisation shrinkage is around 1.5 MPa - substantially less than other composites, so the chance of marginal leakage is greatly reduced.
After bulk filling with SDR, a 2mm "capping layer" of aesthetic composite is placed on top of the SDR.
This allows the bulk of a cavity to be filled in one step, with less chance of problems due to voids / poor adaptation. This page has a promotional video by Denstply showing how it works, and a step-by-step case example undertaken by the dentaljuce team for an undermined occlusal restoration.
Occlusal Restoration: Case Example
Click images to magnify
||Occlusal molar caries
What two clues suggest this is an extensive lesion?
||Access to lesion
What bur is most suitable for access when planning composite restoration, and why?
||Peripheral Caries Removal
What bur is most suitable for removing peripheral caries?
||Removal of peripheral carious dentine leaves unsupported enamel.
This would require removal for an amalgam restoration
But it may be retained if composite is used as enamel will be bonded to and supported by composite.
A large proportion of the cavity's buccal wall is now pure enamel.
||Caries detector dye
Caries detector dye has been applied to reveal caries in undercuts peripherally (Operator preference, not a standard party of the procedure.)
||Caries detector dye - peripheral caries
Wash after 10 seconds.
Still a bit of enamel-dentine junction caries left. This is removed with a rosehead bur (slow handpiece).
||Caries detector dye - not reliable for pulpal caries removal
Pulpal caries removal is judged by hardness NOT dye penetration
Why do currently available caries detectors promote over-preparation?
||Pulpal caries removal completes preparation
What is most suitable for removing pulpal floor caries?
||Lining (operator preference)
A thin layer (<1mm) of Resin-modified Glass ionomer has been placed over the pulpal dentine. (Operator preference)
||Total etch (15 seconds)
Extended 1mm beyond margins and into fissures due to be sealed
||Check etch pattern.
Check etch by washing and drying tooth. Ensure frosty appearance, and all fissures etched.
||Apply Adhesive (Dentine Bonding System)
Follow manufacturer's instructions regarding evaporation, timing and curing.
||Apply SDR Flowable Composite (max 4mm thickness in one go)
One increment was used, leaving 2mm for "capping" aesthetic composite.
Keep the tip in the material during injection.
Allow a few seconds for the SDR to self-level / adapt to undercuts
||Light-cure the SDR - 20 Seconds
||Place 2mm ‘Capping composite’ increment
Use your favourite aesthetic posterior composite. Finish shape as much as possible by hand before curing.
The SDR increment will bond in the normal way to it.
||Apply Fissure Sealant to fissures and pits
|| Minor finishing with burs and discs
Did you notice the "white line" on the buccal margin of the restoration? What is it?
||Solvent-free surface sealant applied & light cured. Restoration Complete.
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