Abstract: A manually-operated sharpening apparatus includes a sharpening member for sharpening a sharpened member such as a dental instrument, a guide member for guiding the sharpened member so as to be movable therealong, and a positioning-assist element for permitting an operator to dispose the sharpened member at a location at which a predetermined angle is formed between the sharpened member and the sharpening member. With use of the sharpening apparatus, the operator can easily sharpen a blade of the sharpened member at a desired blade angle.

Abstract: There is provided a substantially disposable dental tip incorporated in an ultrasonic scaler and a dental working distal end piece used for the dental tip.The dental tip in accordance with the present invention includes a transmission medium whose proximal end portion is connected to an ultrasonic vibration source to transmit ultrasonic vibrations generated from the ultrasonic vibration source and the dental working distal end piece of the present invention which is mounted on a distal tip end of the transmission medium and consists of a tip end member having a shape suitable for dental treatment etc. and a connecting portion connected integrally to a proximal end portion of the tip end member.