The invention relates to a method for sterilizingdisinfecting water circuits of dental units comprising dental handpieces and a water circuit for supplying liquid from a main supply through corresponding circuit legs or branches. A raising and lowering mechanism is disposed inside the housing and is mechanically coupled to the post. An application server provides rich fault messaging using applications that do not provide explicit error messaging and protocols that do not provide explicit error messaging without changing either the application or the protocol by additional interactions between an identity provider and the application server. A radar system employing genetic algorithm analysis is also provided. The adhesive are formulated using a silane-reactive polymer or, alternatively, a non-silane-reactive polymer together with a compatible tackifier. In this respect, the evaluation unit has a preprocessing unit which is implemented on an FPGA, which respectively accesses the pixels of a part region and generates summed values, b) for the respective part region and has a structure recognition unit which calculates the contrast value of the part region from its summed values without accessing pixels of the part region.