Abstract: A dental tool device and method is disclosed by which a smooth beveled surface may be formed on a shoulder of a tooth for receiving a crown fitting so that the joint therebetween is concealed as lying substantially below the gum-line and a solid seal is formed between the tooth and crown. The device includes a vibrating tool A having a shank 44 and contoured portion 46 which includes a contoured surface 48. Surface 48 is contoured and includes a coating 50 of diamond grit so as to form a smooth beveled surface 18 during vibration to finish a previously ground shoulder 14 in accordance with the invention. Tool A is adapted for attachment as an insert 34 into the handle 32 of a conventional ultrasonic dental instrument 30.