US 12,440,306 B2
Dental treatment apparatus and method of driving the same
Kyohei Kato, Kyoto (JP); and Kazunari Matoba, Kyoto (JP)
Assigned to J. MORITA MFG. CORP., Kyoto (JP)
Appl. No. 17/429,168
Filed by J. MORITA MFG. CORP., Kyoto (JP)
PCT Filed Jan. 8, 2020, PCT No. PCT/JP2020/000297
§ 371(c)(1), (2) Date Aug. 6, 2021,
PCT Pub. No. WO2020/162090, PCT Pub. Date Aug. 13, 2020.
Claims priority of application No. 2019-019568 (JP), filed on Feb. 6, 2019.
Prior Publication US 2022/0087777 A1, Mar. 24, 2022
Int. Cl. A61C 1/07 (2006.01); A61C 1/00 (2006.01); A61C 1/12 (2006.01); A61C 5/44 (2017.01); A61C 19/04 (2006.01)
CPC A61C 1/07 (2013.01) [A61C 1/003 (2013.01); A61C 1/12 (2013.01); A61C 5/44 (2017.02); A61C 19/041 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dental treatment apparatus comprising:
a drive unit comprising a micromotor and a motor driver that drives a cutting tool held at a head of a handpiece;
a microcomputer that controls the drive unit that drives the cutting tool; and
a position detector that detects a position of a tip end of the cutting tool within a root canal by electric root canal length measurement,
wherein the microcomputer controls the cutting tool to be held at the head forward driven in a direction of cutting of an object to be cut,
wherein the microcomputer controls the cutting tool to be reverse driven in a direction reverse to forward rotation drive when the cutting tool is forward driven and the position detector detects the tip end of the cutting tool reaching a reference position;
wherein the microcomputer carries out a fail-safe control when the position detector detects movement of the tip of the cutting tool toward a root apex position while the cutting tool is reverse driven;
wherein the cutting tool being controlled to be forward driven comprises the cutting tool being controlled to mainly be driven clockwise, and
wherein the cutting tool being controlled to be reverse driven comprises the cutting tool being controlled to mainly be driven counterclockwise.