643 552 and 6 797 198 the contents of which are incorporated herein by reference polyesterimide anhydrides with terminal anhydride group or lateral anhydrides exemplified in u s pat no 6 730 377 the content of which is incorporated herein by reference or combinations thereof in addition any polymeric composite such as engineering prepegs or composites which are polymers filled with pigments carbon particles silica glass fibers conductive particles such as metal particles or conductive polymers or mixtures thereof may be used likewise the tip may also be either made of metal or plastic and the same or similar material suitable for the handle portion are also suitable for the tip as noted above the tip may also be in the form of a scaler and endodontic file a reamer a dental file or a bur as noted the set of instruments show in fig1 a d are identical except for the diameters of the handles 102 this is also illustrated in fig2 where the handles 102 are of ergonomic design the identical instruments with varying diameter handles may be used interchangeable throughout the day combining the varying diameters with the more ergonomically designed handles the handles can a long way in relieving stress to the hands wrists and elbows of dental professionals at least the portion of the ergonomic handle 102 may have a triangular cross section as shown in fig2 4 or and 5 with a mid section of a smaller circumferential distance than the gripping areas when the tip 104 is.