Direct Restorations
Dentsply SDR - Smart Dentin Replacement
Occlusal Restoration
![]() 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.

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Occlusal Restoration: Case Example
Click images to magnify
![]() Occlusal molar caries |
![]() Access to lesion |
![]() Peripheral Caries Removal |
![]() Removal of peripheral carious dentine leaves unsupported enamel. |
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![]() Caries detector dye - peripheral caries |
![]() Caries detector dye - not reliable for pulpal caries removal |
![]() Pulpal caries removal completes preparation |
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![]() Total etch (15 seconds) |
![]() Check etch pattern. |
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![]() Light-cure the SDR - 20 Seconds |
![]() Place 2mm ‘Capping composite’ increment |
![]() Apply Fissure Sealant to fissures and pits |
![]() Solvent-free surface sealant applied & light cured. Restoration Complete. |