▁Charles ▁E . ▁Bo yd ▁in ▁ 1 9 3 3 . ▁Will am ▁F . ▁ford ▁in ▁ 1 9 5 1 ▁introduced ▁another ▁self - lig ating ▁bra cket ▁under ▁Johnson ▁T win ▁wire ▁technique . ▁In ▁ 1 9 7 1 , ▁A . ▁J . ▁Wild man ▁introduced ▁the ▁Ed gel ok ▁bra cket ▁which ▁was ▁the ▁first ▁type ▁of ▁self - lig ating ▁bra cket ▁that ▁enjoyed ▁commercial ▁success . ▁All ▁these ▁brackets ▁were ▁pass ive ▁in ▁type ▁so ▁far . ▁In ▁ 1 9 7 0 s , ▁a ▁new ▁system ▁called ▁S PE ED ▁app liance ▁was ▁introduced ▁into ▁the ▁market . ▁This ▁was ▁introduced ▁by ▁Dr . ▁G . ▁Herbert ▁Hans on ▁of ▁Hamilton , ▁Ontario , ▁Canada . ▁This ▁bra cket ▁was ▁considered ▁revolution ary ▁in ▁the ▁field ▁of ▁orth od ont ics ▁because ▁it ▁was ▁an ▁active ▁type ▁of ▁self - lig ating ▁bra cket . ▁S PE ED ▁stood ▁for ▁Spring - Loaded , ▁P rec ision , ▁Edge wise , ▁Energy ▁and ▁D elivery . ▁Then ▁in ▁ 1 9 8 6 , ▁Er win ▁P let cher ▁introduced ▁the ▁Act iva ▁Self - L ig ating ▁bra cket . ▁This ▁bra cket ▁had ▁a ▁cur ved ▁arm ▁that ▁rot ated ▁occ l uso - ging iv ally ▁around ▁the ▁bra cket . ▁In ▁ 1 9 9 5 , ▁Time ▁Self - L ig ating ▁Bra cket ▁was ▁introduced . ▁A ▁year ▁later ▁in ▁ 1 9 9 6 ,