Various transfer materials have been proposed for indirect bonding of multistranded stainless steel wire retainers, including silicone-based impression trays, vacuum-formed thermoplastic trays,self-curing acrylic trays, and wire-resin trays Memosil 2 is a transparent addition-cured polyvinyl siloxane elastomer of medium viscosity. Originally designed for bite registration, it has also been used to make transfer trays for indirect, light-cured bonding of orthodontic brackets and occlusal templates for light-cured posterior composite restorations. The material is easy to shape and trim and dimensionally stable once it has set (two minutes); moreover, Memosil 2 transfer trays are less costly to fabricate than vacuum-formed thermoplastic transfer trays. In contrast with direct-bonding techniques, the Memosil 2 transfer tray ensures that the wire remains passive from fabrication to placement.
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