Abstract: A pressure-sensitive grip for a dental hand drill for providing continuous control of the speed thereof. The pressure-sensitive material preferably comprises a strain gage sensing element positioned along the body portion of the dental tool which is normally hand held by the operator. In a fluid-driven dental tool, the strain gage is coupled through a control network which provides an electrical signal to control a proportional valve in the fluid supply line to the drill.

Abstract: A method and apparatus for marking tooth contact points in differing colors on occlusion. The differing colors correspond to differing biting pressures exerted between the teeth. The apparatus comprises paper impregnated with a plurality of groups of different color ink producing chemicals or individual granules, each of the different groups designed to rupture at different biting pressures for producing resultant various predetermined colors.