The Cannon Ultra Bracket System is the first bracket system which enables the orthodontist to easily treat mild to moderate apical base class II and III cases.  This is accomplished by utilizing the interactive slot which allows for dental compensation.  The interactive slot opens to the gingival.  The archwire is held securely in the interactive slot by utilizing the same elements as with the edgewise slot; "0" ring, power chain and steel ligature tie.  There is also a pre-adjusted edgewise slot for the treatment of apical base class I cases.  Bodily en masse retraction of the anterior teeth can be easily accomplished in extraction cases by utilizing an archwire in both slots simultaneously.  When utilizing a .018 steel archwire in the interactive slot with bilateral 25 degree "V" bends in the middle of the extractions sites in conjunction with a .018 x .025 nickel titanium archwire in the pre-adjusted slot, proper moment to force ratio is established so as to bodily retract the anterior teeth and enhance anchorage so that no external anchorage is required. 

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