Touch&Bond®: 4-META chemistry
forms a strong hybrid-layer bond in less than 60 seconds.
Use the special pledget included to activate the Touch&Bond Liquid. Then, with either the pledget or the Precision Applicator Brush (also included), simply apply the activated Touch&Bond to the dentin and enamel surfaces you’re bonding to. The surfaces may be either damp or dry. There’s no acid-etching, rinsing, priming or mixing. Let the Touch&Bond sit on the tooth for 20 seconds. Then gently blow it dry with your air syringe for 3-5 seconds. Use the same pledget to apply another coat. Dry it with your syringe immediately, and light-cure it for 10 seconds with a halogen light. (Note: Touch&Bond is not compatible with PAC or LED lights. LED users, check out Parkell’s Brush&Bond®.) That’s it. The tooth is now ready for composite build-up.
The secret is in the pledgets.
The Touch&Bond pledgets are actually small polyurethane applicators impregnated with a special co-initiator that starts the curing process. The instant the pledget touches the 4-META-based liquid, it triggers a complex penetration-and-polymerization reaction. The adhesive’s 4-META molecules infiltrate the smear-layer left by your bur to grab the sound tooth structure below. Your halogen curing light then completes the polymerization. (For your convenience, the kit also includes Precision Applicator Brushes that you can use to apply the initiated liquid.)
The result is the kind of 4-META hybrid-layer bond and tooth-protecting biological seal that once required complex steps involving etching, rinsing and priming.
In laboratory bond strength tests, Touch&Bond demonstrated microtensile bond strengths of 22.4 MPa (3250 psi) to dentin. Even more significantly, in all clinical trials conducted, there was not a single case of post-op sensitivity reported.