The orientation grooves define the maximum substance removal desired, thus determining the level of the definitive preparation. The smaller (834/016-018) create a 0.3 – 0.35 mm depth on the central incisors and canines, while the larger (834/021) head size creates a 0.5 mm depth on lateral incisors.
Labial orientation grooves can also be created with the new depth markers 868B/018-020, starting at the cervical third of the labial surface. The narrow diamond coated parts of the working element allow easy creation of orientation grooves without excessive heat generation. Even when applied at too steep an angle, the tapered shape of the working element and its rounded tip safely prevent excessive penetration.