that the retention bumps or flanges 555 on the hook will snap into the buccal tube hook 563 when inserted into the distal end of the lip bumper tube at an angle of approximately 90 degrees away from the buccal tube and then rotated 90 degrees toward the buccal tube and into its final upright position shown in fig5 a after securing the hook in with a 0 012 u2033 stainless steel ligature tie the clinician or orthodontic technician simply places the forsus rod directly onto the coupler bypassing the wire and braces and thereby eliminating the chance of breaking brackets while the forsus rod is in use another advantage of the device of fig5 is the ability to utilize the forsus appliance along with the removable coupler 522 in order to achieve class ii correction and close mandibular space no other appliance known to the applicant can achieve similar correction because in certain embodiments there is no soldered lingual bar e g 418 on the mandibular first molar band that rests against the lingual surface of the mandibular anterior teeth the mandibular molar tooth can move forward mesial when the forsus appliance or any other force member is attached the herbst appliance higgins cross bow appliance in contrast all have soldered lingual bars that prevent any space closure there are many class ii crowding cases where the clinician will extract the maxillary first bicuspid teeth as well as the mandibular second bicuspid teeth in order to alleviate crowding in both arches and correct a class ii molar relationship traditional methods involve using class ii elastics but as mentioned above such conventional treatments come with many limitations and rely solely on patient compliance the forsus appliance along with the removable coupler of fig5 provides.