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

AVO ID
12 Fundamentals of Periodontal Instrumentation & Advanced Root Instrumentation
OK
20
Fig ure 1-13. Neutral Neck Position
Goal:
• Head tilt of 0 to 20 degrees
• The line from eyes to the treatment area should be as
near to vertical as possible
Avoid:
• Head tipped too far forward
• Head tilted to one side
O K
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Fig ure 1-14. Neutral Back Position
Goal:
• Lean forward slightly from the hips (hinge at hips)
• Trunk exion of 0 to 20 degrees
Avoid:
• Over exion of the spine (curved back)
Fig ure 1-15. Neutral Torso Position
Goal:
• Torso in line with long axis of the body
Avoid:
• Leaning torso to one side
• Twisting the torso
Fig ure 1-16. Neutral Shoulder Position
Goal:
• Shoulders in horizontal line
• Weight evenly balanced when seated
Avoid:
• Shoulders lifted up toward ears
• Shoulders hunched forward
• Sitting with weight on one hip
AVOID
OK
OK
AVOID
AVOID
AVOID