A system for surgical navigation in oral surgery, comprising: at least one processing system for: obtaining a three-dimensional anatomical representation of part of a patient; and producing at least one two-dimensional volume slice view of the three-dimensional anatomical representation , the at least one two-dimensional volume slice view based on a physical position and axial orientation of at least one reference tool ; a display device for displaying the at least one two-dimensional volume slice view to a user; a tracking device for recording the physical position and axial orientation of the at least one reference tool provided with one or more reference markers ; wherein the at least one processing system is able to transform the physical position and axial orientation of the at least one reference tool into spatial coordinates relative to the three-dimensional anatomical representation of part of the patient; wherein, the at least one two-dimensional volume slice view to be displayed is updated by movement of the physical position and axial orientation of the at least one reference tool during surgical navigation in oral surgery; characterised by the at least one reference tool being a first reference tool mounted on a piezo-electric surgical instrument ; and a drill tip mounted on the piezo-electric surgical instrument ; wherein in use the display device displays a real-time tracking view of the position and axial orientation of the drill tip of the piezo-electric surgical instrument relative to the three-dimensional anatomical representation and the at least one two-dimensional volume slice view . at least one processing system for: obtaining a three-dimensional anatomical representation of part of a patient; and producing at least one two-dimensional volume slice view of the three-dimensional anatomical representation , the at least one two-dimensional volume slice view based on a physical position and axial orientation of at least one reference tool ; obtaining a three-dimensional anatomical representation of part of a patient; and producing at least one two-dimensional volume slice view of the three-dimensional anatomical representation , the at least one two-dimensional volume slice view based on a physical position and axial orientation of at least one reference tool ; a display device for displaying the at least one two-dimensional volume slice view to a user; a tracking device for recording the physical position and axial orientation of the at least one reference tool provided with one or more reference markers ; wherein the at least one processing system is able to transform the physical position and axial orientation of the at least one reference tool into spatial coordinates relative to the three-dimensional anatomical representation of part of the patient; wherein, the at least one two-dimensional volume slice view to be displayed is updated by movement of the physical position and axial orientation of the at least one reference tool during surgical navigation in oral surgery; characterised by the at least one reference tool being a first reference tool mounted on a piezo-electric surgical instrument ; and a drill tip mounted on the piezo-electric surgical instrument ; wherein in use the display device displays a real-time tracking view of the position and axial orientation of the drill tip of the piezo-electric surgical instrument relative to the three-dimensional anatomical representation and the at least one two-dimensional volume slice view . <EOS>