The effect of initiation system and BTDMA monomer concentrations on the shrinkage behavior of an experimental dentin bonding system

Dental adhesives are now widely used to bond restorative materials to the tooth structure. Besides functional and crosslinking monomers, dental adhesives contain a photo-initiationsystem for polymerization, thereby providing physico mechanical strength to the adhesive–tooth interface. Fewstudies have investigated the effect of the functional monomerand polymerization–initiation system on the polymerization efficiency of the adhesive [1] . In the present study, the effectof BTDMA which is a synthetic monomer bearing carboxylic acid and methacrylate functionalities, as a functional monomerand two photo-initiator systems, camphorquinone-amine (CQ) and butanedione (BD) on the shrinkage behaviour of an experimental dentin bonding system were investigated.