So what is this sandwich technique? Is it associated with the edible sandwiches ?

No!

In fact it is associated with a technique in dentistry. So it looks something like this . Lets see what,why, and how is it used !

• Composite doesn’t bind to the dentin in an adequate manner
• So during polymerization there maybe a gap created
• This gap is created if the margin is near the dentin

How can the bonding be improved ?

• By placing a layer of Glass Ionomer Cement (GIC) between the composite restoration and the dentin.
• The GIC bonds to dentin by chemical adhesion
• And resin bonds mechanically to porosities
• Crazing is seen on the surface of GIC

GIC can be etched with phosphoric acid which helps in retention.

Indications –

• In class 2 composite restoration
• Lesions where one or more margins are in dentin (cervical lesions)

Procedure

source – textbook of dental materials (manapallil), philips, slide share and google images