CASE STUDY #1: Yоu hаve cоmpleted yоur аssessments on your pаtient and are getting ready to scale. You don't see a test stick in your cassette, so you are going to use the Visual Test using light to determine if your instruments are sharp or dull. Once you have determined this, you sharpen several of your instruments using the technique that we practiced in class. Once your instruments are sharpened, you decide to use the sickle scalers as your first hand instruments on your patient since they are periodontally healthy and do not have periodontal pockets to scale. Use this information to answer the following questions. QUESTION: At what degree of angulation is the face to the shank on posterior sickle scalers and how many cutting edges are there per end sickle end?