In the following arrangement, if  the rest is placed on a cantilever pontic , the cantilever can act as a: (A) First class lever, (B) Second class lever, (C) Third class lever, (D) None of the above
Answer is A. A cantilever can be described as a rigid beam supported only at one end. When force is directed against the unsupported end of the beam (as in this rest placed on a cantilevered pontic), the cantilever can act as a first-class lever. The mechanical advantage in this illustration favors the effort arm.