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Deep restorations like this call for a bioactive ionic resin matrix liner like Pulpdent Activa Base/Liner (silly me, no photograph).

It is both light and dual cured, and features a rubberized resin matrix that has 2-3 times the fracture toughness of normal composites and around 5-10 times that of GICs and RMGICs.  It has active ionic exchange capabiility due to its recharge-capability of Ca2+, PO43- and F- ions from its ionomer glass particles.  The only downside is that it has approximately the same radiopacity as dentin – slightly greater.  I wish this was more as I like to demarcate the restoration clearly radiographically.
External 1.5mm restored using a single shade of A2 Venus Pearl.
Have a great weekend,
#Pulpdent #Activa #VenusPearl #Kulzer #HealthcareEssentialsNZ