Measurement of accuracy tolerance Medic NRGs Digital Apex

Measurement of accuracy tolerance Medic. NRG’s Digital Apex Locators Apex. NRG-XFR Apex. NRG-Blue All measurements performed with a digital micrometer, with no human intervention Documentation from clinical analysis performed by: Professor Joshua Moshonov, DMD Gregory Berdichevsky, electromechanical engineer DRAFT VERSION Additional information to be processed and added

Documentation using a digital camera. Measurement apparatus – Digital Micrometer

The measuring apparatus measures the location of the electrode or file in the canal, accurate to the thousandths of a millimeter. This is a unique device in that it is the first time no human error is present in testing the accuracy of an apex locator. The apparatus has a built in digital camera that documents the results of the location of the file and the micrometer results. Adjustment mechanism of the tooth relative to the file. The spatial adjustment is made by: a screw on axis Y; and magnetic surfaces on axis X. In addition, the devices were tested in the full range of tolerance – the lowest point of the range and the highest point of the range before reaching the next point to be measured.

The reference point is determined after reading the “apex”. Proof is found using both x-ray and liquid Met. Apex in the apical region.

The Apex. NRG-XFR reads “APEX” (0. 00) upon reaching the apical constriction

The measurements with the Apex. NRG Blue device received three separate inputs simultaneously in order to fully confirm the results of the reading: 1. Micrometer reading; 2. Device reading; 3. File in canal on screen, with a visual resolution of 0. 1 mm. In addition, the grey square on the right side of the screen confirms the change made by the micrometer, in a resolution of 0. 1 mm. The resolution on the device itself is 0. 25 mm from the Apex – 0. 5 mm. From 0. 5 mm – 2. 0 mm the resolution is only every 0. 5 mm. Therefore, when comparing the results with the micrometer, the main comparison should be with the two screen readings as described above. 1 2 3

Apex. NRG-Blue Device reads: APEX (0. 00) Micrometer reads: 0. 102 mm Deviation: 0. 102 Measured at the highest point before changing to 0. 25. Actual deviation: 0. 051. Device reads: APEX (0. 00) Micrometer reads: 0. 00 mm Deviation: 0. 00 1 Riding on the device =0. 00 2 3

Apex. NRG-Blue Device reads: 0. 25 mm Micrometer reads: 0. 181 mm Deviation: 0. 069 Screen reads: 0. 375 mm Micrometer reads: 0. 351 mm Deviation: 0. 024

Apex. NRG-Blue Device reads: 0. 50 mm Micrometer reads: 0. 452 mm Deviation: 0. 048 Screen reads: 0. 60 mm Micrometer reads: 0. 533 mm Deviation: 0. 067

Apex. NRG-Blue Screen reads: 0. 70 mm Micrometer reads: 0. 621 mm Deviation: 0. 079 Screen reads: 0. 80 mm Micrometer reads: 0. 734 mm Deviation: 0. 066

Apex. NRG-Blue Screen reads: 0. 90 mm Micrometer reads: 0. 830 mm Deviation: 0. 070 Device reads: 1. 00 mm Micrometer reads: 0. 935 mm Deviation: 0. 065

Apex. NRG-XFR Device reads: APEX (0. 00) Micrometer reads: 0. 000 mm Deviation: 0. 000 Device reads: 0. 25 mm Micrometer reads: 0. 222 mm Deviation: 0. 028

Apex. NRG-XFR Device reads: 0. 50 mm Micrometer reads: 0. 437 mm Deviation: 0. 013 Device reads: 0. 75 mm Micrometer reads: 0. 726 mm Deviation: 0. 024

Apex. NRG-XFR Device reads: 1. 00 mm Micrometer reads: 0. 810 mm Deviation: 0. 190 Device reads: 1. 50 mm Micrometer reads: 1. 345 mm Deviation: 0. 155

Apex. NRG-XFR Device reads: 2. 00 mm Micrometer reads: 1. 818 mm Deviation: 0. 182

Micrometer: 0. 0 mm Apex. NRG Blue: 0. 0 mm Micrometer: 1. 252 mm Apex. NRG Blue : 1. 5 mm Micrometer: -0. 0011 mm Apex. NRG Blue : Past Apex