Abstract: A prophy angle comprising a body, a drive system, and a paste feed assembly. The body includes a cylinder and a head portion associated with the cylinder. The drive system extends through the body and includes a drive shaft assembly and a cup shaft assembly. The drive shaft assembly extends through the cylinder. The cup shaft assembly extends through the head portion. The cup shaft assembly is coupled to the drive shaft assembly and further includes a prophy cup disposed at one end thereof. The prophy cup is in fluid communication with the body. The paste feed assembly includes a piston assembly and a piston movement assembly. The piston movement assembly includes a handle member. The handle member includes a second end associated with the piston assembly, a first end distally spaced therefrom and a pivot point positioned therebetween.

Abstract: A waveguide configuration comprising a core, at least one cladding and a buffer. The core includes Al and Yb. The respective amount Yb in the divalent state is such that any indirect and direct losses of Yb in the divalent state are exceeded by the gain attributable to Yb in the trivalent state. The at least one cladding extends about the core. The at least one buffer extends about the outermost of the at least one cladding.