Ibi bikinisho by'injangwe byose bikozwe mu ntoki zifite umutekano, imipira y'injangwe ikozwe mu budodo bworoshye bw'ubwoya bw'intama ndetse n'ibikoresho byo kwisiga kugira ngo ibyo bikinisho by'injangwe bitazababaza amajosi y'injangwe, imipira y'injangwe n'inzogera imbere kugira ngo injangwe zibone igihe ziri gukina.