National Board Dental Hygiene Examination (NBDHE) Dental Hygienist Practice Test

During the appointment, the hygienist needs to sharpen a different scaler. The face of an instrument should be at what angle to the sharpening stone?

1. 90 degrees

2. 100 degrees

3. 110 degrees

4. 120 degrees

The correct answer is: 110 degrees

In the context of sharpening dental instruments, such as scalers, the angle of the instrument's face relative to the sharpening stone is critical for achieving an effective and precise edge. The correct angle for sharpening a scaler is 110 degrees. At this angle, the face of the scaler is positioned in a way that allows for the removal of metal while preserving the integrity of the cutting edge, thereby ensuring that the instrument remains sharp and functional. Meeting this angle facilitates the formation of a fine cutting edge that enhances the efficiency of the scaler during dental cleanings and procedures. Setting the angle too steep or too obtuse can lead to ineffective sharpening, risking damage to the instrument or producing a dull edge that fails to perform as intended. The choice of 110 degrees represents a balance conducive to maintaining optimal instrument performance and longevity.