Jill Gehrig, Rebecca Sroda, Darlene Saccuzzo - Fundamentals of Periodontal Instrumentation and Advanced Root Instrumentation (2016, LWW) - libgen.lc

26 Fundamentals of Periodontal Instrumentation & Advanced Root Instrumentation
Fig ure 1-46. Co rre ct Po sitio ning . Here the patient chair
and patient’s head are positioned at the correct height in
relation to the clinician. Note that the clinician holds her
upper arms parallel to her torso, her arms are not raised,
and her shoulders are relaxed.
Figure 1-47. Incorrect Positioning—Patient Too High.
A. Note how this clinician must hold her elbows up in a stress ul position in order to reach the mouth
because she has positioned the patient’s chair too high. This error is o ten due to the misconception
that the clinician sees better i the patient is closer to the clinician’s eyes. Actually, the reverse is true;
the clinician has improved vision o the mouth when the patient is in a lower position.
B. In this example, the patient is positioned too high or the clinician. As a result, the clinician’s chair is
raised so the clinician can reach the mouth. The high chair position causes her to rest her eet on the
rungs o the chair because she cannot touch the f oor with the soles o her shoes.