The Chisels considerably better success forecasts than particles or blocks of bone which are taken from other regions of the body. Therefore at the widening of the ridge this gentle method is effected very gla dly ( Rid g e - S plit tin g ) . T h e r e c o m m e n e d instruments are qualified for single tooth implants as well as for wider ridge patterns. The continuous measuring marks ensure an exact control of the penetration depth.