Den elliptiske kuttet i instrumentspissen og det diamantformede platået sikrer skånsom penetrering i det intradentale rommet eller i den periodontale spalten. På grunn av formen er fire luksasjonsbevegelser mulig ved 18° rotasjon — to mesiale og to distale. Spaken arbeider med 5–7 hypomochlia (roterende og støttende bevegelser) under luksasjonsprosessen. Dette gjør den klart overlegent enhver konvensjonell spak (maks. 1–2 hypomochlia). Avløsning fremmes spesielt av instrumentets taggete egg. På grunn av formen bør aksial påkjenning av instrumentspissene unngås, da dette kan føre til brudd.
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