Which of the following is NOT considered a source of knowledge? 

The NASW Code of Ethics states that participation in research should not be voluntary but based on informed consent. 

What is a variable in research?

The upright position is used for all of the following EXCEPT

The part of he dental assistants stool designed to help the user avoid lower back pain caused by leaning over during the procedure is the

The patient position in the dental chair in which the head is lower than the chest is called the _________position

The foot controlled device that controls the speed of the handpiece is called a(n)

Two features found on a dental assistants stool but not on the operators stool are:

An instrument used to harden or cure light sensitive dental materials

The correct positioning of the operators stool should include