The best property of composite is its ability of micromechanical adhesion, unlike amalgam, depth isnt a factor for retention…retention depends on etching,bonding and most importantly beveling.
Hence, just removal of caries is sufficient for retention,what one should concentrate on is the technique,isolation as well as incorporation of bevels.
hi,
I think there must a depth of at least 2.5 to 3 mm or perhaps even more for a composite filling to be retentive. Dr. Gordo Christensen also recommends creating undercuts. If there is not sufficient depth then there will be no strength to the filling. Beveling in posterior composite restorations is a controversial topic.
If the caries are incipient then you could use fissurotomy burs and in case if the caries is superficial and not very broad you could flow flowable composite or selants and cure it. But the caries must be very superficial for this to succeed.
Regards,
Veerendra darakh
