▁arch wire ▁and ▁a ▁wire ▁bra cket ▁interaction ▁is ▁observed . ▁A ▁pass ive ▁self - lig ating ▁bra cket ▁has ▁a ▁door , ▁which ▁when ▁closed , ▁does ▁not ▁lead ▁to ▁any ▁pressure ▁on ▁the ▁arch wire . ▁Ex amples ▁of ▁active ▁types ▁include ▁In - ov ation , ▁S PE ED ▁and ▁Tim el ock ▁brackets . ▁Ex amples ▁of ▁pass ive ▁types ▁include ▁Dam on , ▁e Lock ▁and ▁Sm art C lip . ▁ ▁Fr iction ▁ ▁A ▁study ▁published ▁by ▁P ach ec o ▁et ▁al . ▁stated ▁that ▁when ▁tested ▁with ▁rect angular ▁w ires , ▁active ▁self - lig ating ▁brackets ▁showed ▁significantly ▁higher ▁fr iction ▁than ▁pass ive ▁self - lig ating ▁brackets , ▁with ▁results ▁statist ically ▁similar ▁to ▁conventional ▁brackets ▁using ▁same ▁cal iber ▁arch w ires . ▁These ▁results ▁were ▁agreed ▁upon ▁by ▁another ▁study ▁published ▁in ▁ 2 0 1 0 ▁by ▁Stefan os ▁et ▁al . ▁which ▁stated ▁that ▁Pass ive ▁self - lig ating ▁brackets ▁have ▁lower ▁static ▁and ▁kin etic ▁fr ict ional ▁resistance ▁than ▁do ▁active ▁self - lig ating ▁brackets ▁with ▁ 0 . 0 1 9 ▁× ▁ 0 . 0 2 5 - in ▁st ain less ▁steel ▁wire . ▁ ▁E volution ▁of ▁Self - lig ating ▁brackets ▁ ▁Below ▁is ▁the ▁list ▁of ▁brackets ▁that ▁have ▁been ▁designed ▁over ▁past ▁ 8 0 ▁years . ▁ ▁References ▁ ▁Category : D ental ▁equipment ▁Category : Or th od ont ic ▁app li