Kugabanya umuhanda wa dogere 90 inkokora yoroheje yicyuma gikwiye ni umuyoboro woguhuza , ukoreshwa muguhuza imiyoboro ibiri yubunini butandukanye kuri dogere 90, hamwe numutwe umwe wagenewe guhuza imbere mumiyoboro minini naho undi ugahuza hejuru yumuyoboro muto.Bikunze gukoreshwa mumazi, gushyushya, na gaze kugirango yerekane imiyoboro ikikije inzitizi, guhindura icyerekezo, cyangwa inzibacyuho hagati yubunini.Ubwubatsi bwibyuma byoroshye birashobora kuramba kandi bikarwanya gucika cyangwa kumeneka mukibazo.