Adapting the NTI-tss Standard-Wide (or Universal) matrix to bracketed teeth 
A)B)
Obviously, neither the Universal (shown above, A), or the Standard-wide will fit over the brackets.  Cut away the labial wall so that it extends to just under the brackets (B).
     If using the Universal, adapt acrylic resin to create a Discluding Element (not necessary when using the Standard-wide) and reline with the thermoplastic beads (samples of the TPB material are available upon request).  Have the patient press the extruding palatal TPB material against the roof of their mouth, and use an instument to keep the TPB material from flowing up into the brackets on the labial prior to its setting.  The patient may need to use a plastic instrument to engage the apical edge (red arrow) of the matrix to disengage.
     Each night, the entire device should be sliiightly softened in hot water and re-adapted, to allow for the potential tooth movement that might have occured prior during that day.