ADEX Dental Hygiene Exam Prep

Answer - B - Angulation is the relationship between the face of a calculus removal instrument and the tooth surface to which the working-end is applied. For insertion beneath the gingival margin, the fact-to-tooth surface angulation is between 0 and 40 degrees. For debridement, the face-to-tooth surface angulation is between 45 and 90 degrees.