Dental treating apparatus and driving method for the same

Patent metadata

Field	Value
Publication number	US-9895205-B2
Application number	US-201414489967-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Sep 20, 2013
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A dental treating apparatus according to the present invention includes: a hand piece; a head unit; a driving unit; a control unit; a load specifying unit; and a load comparing unit. The hand piece drivably holds a cutting tool on the head unit. The driving unit drives the cutting tool in a normal rotation direction or in a reverse rotation direction. The load comparing unit compares a load detected and a reference load. During a normal rotation period until driving for rotating the cutting tool in the normal rotation direction by the driving unit satisfies a predetermined first condition, the control unit maintains a rotation direction of the cutting tool in the normal rotation direction, and when a result of comparison by the load comparing unit attains a predetermined result during the normal rotation period, the control unit controls the rotation direction to the reverse rotation direction.

First claim

What is claimed is:

1. A dental treating apparatus, comprising:
a hand piece for drivably holding a cutting tool on a head unit;
a driving unit for driving said cutting tool so as to be rotatable in a normal rotation direction in which said cutting tool cuts an object to be cut and in a reverse rotation direction opposite to said normal rotation direction;
a control unit for controlling a rotation direction of said cutting tool;
a load specifying unit for specifying a load applied to said cutting tool; and
a load comparing unit for comparing the load specified by said load specifying unit and a reference load,
wherein during a normal rotation period until a predetermined first condition of driving said cutting tool is satisfied, said control unit maintains the rotation direction of said cutting tool in said normal rotation direction,
wherein when a result of comparison by said load comparing unit attains a predetermined result during said normal rotation period, said control unit controls the rotation direction of said cutting tool to said reverse rotation direction,
wherein when a predetermined second condition is satisfied, said control unit controls the rotation direction of said cutting tool to be switched from said reverse rotation direction to said normal rotation direction, and
wherein the predetermined second condition is a predetermined reverse rotation angle or a predetermined reverse rotation time.

2. The dental treating apparatus according to claim 1 , wherein during driving in said normal rotation direction by said driving unit until said predetermined first condition is satisfied, said load comparing unit compares the load specified by said load specifying unit and said reference load.

3. The dental treating apparatus according to claim 2 , wherein during driving in said normal rotation direction by said driving unit until said predetermined first condition is satisfied, said load comparing unit compares the load specified by said load specifying unit and said reference load based on a maximum value, an average value or at least one of a plurality of specified values of the load applied to said cutting tool.

4. The dental treating apparatus according to claim 1 , wherein said predetermined result is a case in which the load specified by said load specifying unit becomes equal to or larger than said reference load.

5. The dental treating apparatus according to claim 1 , wherein when driving of said cutting tool controlled to said normal rotation direction by said control unit satisfies said predetermined first condition, said load comparing unit compares the load specified by said load specifying unit and said reference load again.

6. The dental treating apparatus according to claim 1 , wherein when driving for rotating said cutting tool in said reverse rotation direction by said driving unit satisfies a predetermined second condition, said load comparing unit compares the load specified by said load specifying unit and said reference load, and when the load specified by said load specifying unit is equal to or larger than said reference load as a result of comparison by said load comparing unit, said control unit further controls the rotation direction of said cutting tool to said reverse rotation direction.

7. The dental treating apparatus according to claim 1 , wherein said driving unit sets a reverse rotation angular speed when said cutting tool is driven in said reverse rotation direction to be higher than a rotation angular speed when said cutting tool is driven in said normal rotation direction.

8. The dental treating apparatus according to claim 1 , further comprising a driving state detecting unit for detecting a position of a tip end of said cutting tool in a root canal obtained by electrical root canal length measurement, wherein said control unit changes said reference load in accordance with said position detected by said driving state detecting unit.

9. The dental treating apparatus according to claim 8 , wherein said control unit changes said reference load to become smaller as said position detected by said driving state detecting unit comes closer to a predetermined reference position.

10. The dental treating apparatus according to claim 1 , further comprising a driving state detecting unit for detecting a position of a tip end of said cutting tool in a root canal obtained by electrical root canal length measurement, wherein said control unit changes said predetermined first condition in accordance with said position detected by said driving state detecting unit.

11. The dental treating apparatus according to claim 1 , further comprising a driving state detecting unit for detecting a position of a tip end of said cutting tool in a root canal obtained by electrical root canal length measurement, wherein said control unit changes said predetermined second condition in accordance with said position detected by said driving state detecting unit.

12. The dental treating apparatus according to claim 1 , further comprising a notifier for notifying a user of the rotation direction of said cutting tool controlled by said control unit.

13. The dental treating apparatus according to claim 12 , wherein said notifier is a display unit and is provided at said hand piece.

14. The dental treating apparatus according to claim 1 , wherein said predetermined first condition is set based on a rotation angle or a rotation time when said driving unit drives said cutting tool in said normal rotation direction, and defines a timing for switching driving to said reverse rotation direction, and said predetermined second condition is set based on a reverse rotation angle or a reverse rotation time when said driving unit drives said cutting tool in said reverse rotation direction, and defines a timing for switching driving to said reverse rotation direction.

15. The dental treating apparatus according to claim 14 , wherein the rotation angle or the rotation time set by said predetermined first condition is set to be larger than the reverse rotation angle or the reverse rotation time set by said predetermined second condition.

16. The dental treating apparatus according to claim 15 , wherein the reverse rotation angle or the reverse rotation time set by said predetermined second condition is one-half or larger of the rotation angle or the rotation time set by said predetermined first condition.

17. The dental treating apparatus according to claim 14 , further comprising a driving state detecting unit for detecting a position of a tip end of said cutting tool in a root canal obtained by electrical root canal length measurement, wherein said control unit changes the rotation angle or the rotation time set by said predetermined first condition to become smaller as said position detected by said driving state detecting unit comes closer to a predetermined reference position.

18. The dental treating apparatus according to claim 14 , further comprising a driving state detecting unit for detecting a position of a tip end of said cutting tool in a root canal obtained by electrical root canal length measurement, wherein said control unit changes the reverse rotation angle or the reverse rotation time set by said predetermined second condition to become larger as said position detected by said driving state detecting unit comes closer to a predetermined reference position.

19. The dental treating apparatus according to claim 1 , further comprising a setting unit for setting at least one set value of said predetermined first condition, said reference load

Assignees

• J Morita Mfg Corp

Inventors

• Katsuda Naoki
• Yamashita Seiichiro
• Ueda Tomoaki
• Hijikata Hideo

Classifications

• A61C5/025 Primary

  Human Necessities · mapped topic

• A61C5/40

  Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots · CPC title

• A61C19/041

  for measuring the length of the root canal of a tooth · CPC title

• A61C1/0023

  Foot control · CPC title

• A61C5/48

  Means for preventing loss of endodontic instruments during treatment · CPC title