Key Terms
A mechanism that prevents entry of fluids and microorganisms into waterlines as a result of negative water pressure; "suck-back"
Anti retraction Valve
How long should you flush all DUWLs and handpieces in between each patient?
20 to 30 seconds
What position is the ideal place to work from?
Neutral Position
What is Legionella and where is it found?
Species of harmful bacteria often found in moist places
What can too small of gloves do to your hand?
Place excessive tension on your thenar eminence
Describes bacteria that is freely floating
Biofilm attached to walls of the DUWLs
Planktonic ; Sessile
What piece of equipment should you use when assisting the use of a high speed handpiece, ultrasonic scaler, and air water syringe?
High-Volume Evacuator
What are the zones for a right handed dentist?
12-2 Static
2-4 Assisting
4-7 Transfer
7-12 Operating
What is biofilm?
Bacterial cells and other microbes that adhere to surfaces and form a protective slime layer.
The properly aligned spine resembles what?
a gentle S
Pain associated with continued flexion and extension of the wrist
Carpal Tunnel Syndrome (CTS)
What serves as a protective barrier for the patient from dental unit water?
Rubber Dam
Where should the instrument tray and equipment be positioned?
Where should the operatory light be positioned?
Normal Horizontal Reach/ Maximum Vertical Reach
How many more times is bacteria in the biofilm resistant to chemical germicides than planktonic bacteria?
1500
What is the first symptom of CTS?
Painful tingling in the hands, usually during the night
Injuries caused by sudden twisting or wrenching of a joint with stretching or tearing of ligaments
Injuries caused by extreme stretching of muscles or ligaments
Sprain;Strain
How many CFUs is dangerous in a waterline?
500 and above
How should you grab something that is located behind you?
Rotate the chair to avoid twisting your body
How narrow of a tube does DUWLs have?
1/8 in to 1/16 in
What is something that is not possible yet that involves reducing Bacterial Contamination?
Killing all Bacteria
Fleshy Mound on the palm at the base of the thumb
Thenar Eminence
What occurs when the pressure in the patients mouth is less than that in the evacuator?
Backflow
Where should dental assistants knees be placed?
Even with edge of the patient's headrest
What time does the planktonic community of bacteria attach to the walls of the tube?
During intermittent stagnation that occurs overnight and over weekends
What "shocks"the water to clean it for treatment?
biocidal levels of chemicals