Case Report: The is a clinical case of a second maxillary molar with four root canals using a new revo –s rotary file system.

Discussion: Successful root canal treatment depends on proper cleaning, shaping and compact filling of the root canal under aseptic conditions. With the use of a new file system revo s, a standard procedure can be carried out. Its asymmetrical section initiates a snake-like movement of the instrument inside the canal. Due to its high performance and simplicity of use, this sequence is adapted for most root canal anatomies. Conclusion: Revo S is a n efficient file system which works in a cyclic way. Its cutting efficiency, clearance and cleaning enables the operator to perform function with less fatigue and preservation of dentinal walls.