For proper scaling with a Gracey curette, the terminal shank should be aligned how in relation to the tooth?

For proper scaling with a Gracey curette, the terminal shank should be aligned parallel to the surface of the tooth being instrumented. This alignment ensures that the cutting edge of the instrument is positioned correctly against the tooth surface, allowing for effective removal of calculus and plaque. When the terminal shank is parallel, the angle of the blade is optimal for engaging the dental calculus without risking damage to the tooth surface or periodontal tissues.

Furthermore, achieving this parallel alignment helps maintain proper adaptation of the curette to the contour of the tooth, enhancing the efficiency of the scaling process. Misalignment, such as skewing or bending at an angle, would compromise the effectiveness of the curette and could lead to inadequate cleaning or even trauma to the soft tissues. Therefore, maintaining a parallel position of the terminal shank is essential for achieving optimal results in periodontal therapy.