What portion of the working end of the blade is best used to adapt to a tooth surface during scaling?

Question

Quizplus · Accepted Answer

The most effective or important part of the blade for adaptation is the lower one-third. The entire length of a blade does not adapt well to a tooth surface. Using the tip or toe only will cause damage to hard tissue. This portion does not adapt and will cause soft-tissue trauma in the inner lining of the epithelium attachment.

What Portion of the Working End of the Blade Is