Safe, gentle, and protective: The Vector principle Sonic and ultrasound instruments have become established in periodontal treatment as an alternative to traditional manual instruments. However, ultrasonic instruments have disadvantages as well as advantages: Often, they move elliptically, meaning that even and vibration-free work is not always possible on every single tooth surface. This can result in irritation and unwanted loss of substance on the root surface. The method thus far unrivaled, and meticulously put into practice by Dürr Dental: The Vector principle – a provably gentle and mild periodontal treatment. The ultrasound energy is accurately deflected in a linear direction. Thanks to this patented vibration deflection system, the instruments are then moved parallel to the surface of the root only. Treatment can be administered in a clinically efficient manner using ultrasound energy, causing no trauma to the patient.