Dental treatment apparatus

A dental treatment apparatus that energizes a root canal with a high-frequency current, the dental treatment apparatus comprising:

• a holder configured to hold an electrode placed in the root canal;
• a power supply configured to energize the electrode with the high-frequency current;
• a detector configured to detect the current value which energizes the electrode;
• root canal length measurement circuitry configured to electrically measure a position of a distal end of the electrode in the root canal;
• and
• controller circuitry configured to control a current value of a high-frequency current energizing the electrode, wherein
• the controller circuitry is further configured to measure a time when a current value is detected by the detector as being less than a minimum current value of a predetermined range and to output the measured time,
• wherein
• the controller circuitry is further configured to implement:
• a first control mode where the root canal length measurement circuitry is controlled to electrically measure the position of the distal end of the electrode in the root canal by energizing the electrode with a measurement signal, and
• a second control mode where the power supply is controlled to energize the electrode with the high-frequency current,
• wherein the controller circuitry is further configured to switch from the second control mode to the first control mode during a pause period where the energizing of the electrode with the high-frequency current is paused, the pause period being provided between two adjacent energization periods of a plurality of energization periods where the electrode is energized with the high-frequency current, and
• wherein each energization period includes a plurality of energizations.

A dental treatment apparatus that energizes a dental treatment site with a high-frequency current, the dental treatment apparatus comprising:

• a holder configured to hold an electrode placed at the dental treatment site;
• a power supply configured to energize the electrode with the high-frequency current under constant current drive;
• root canal length measurement circuitry to electrically measure a position of a distal end of the electrode in a root canal;
• and
• controller circuitry configured to reduce a current value of a high-frequency current energizing the electrode as the position of the distal end of the electrode measured by the root canal length measuring circuit approaches the apex position,
• wherein the root canal length measurement circuitry is configured to electrically measure the position of the distal end of the electrode in the root canal based on respective impedance values between the electrode and a passive electrode in contact with a lip,
• wherein the controller circuitry configured to reduce the current value of the high-frequency current energizing such that an actual current passing through the electrode is reduced,
• wherein
• the controller circuitry is further configured to implement:
• a first control mode where the root canal length measurement circuitry is controlled to electrically measure the position of the distal end of the electrode in the root canal by energizing the electrode with a measurement signal, and
• a second control mode where the power supply is controlled to energize the electrode with the high-frequency current,
• wherein the controller circuitry is further configured to switch from the second control mode to the first control mode during a pause period where the energizing of the electrode with the high-frequency current is paused, the pause period being provided between two adjacent energization periods of a plurality of energization periods where the electrode is energized with the high-frequency current, and
• wherein each energization period includes a plurality of energizations.