Measurement of accuracy toleranceMedicNRG’s Digital Apex Locators

ApexNRG-XFRApexNRG-Blue

All measurements performed with a digital micrometer, with no human intervention

Documentation from clinical analysis performed by:Professor Joshua Moshonov, DMDGregory Berdichevsky, electromechanical engineer

DRAFT VERSIONAdditional 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 highestpoint of the range before

reaching the next point to be measured.

Relationship between Major Apical Foramen and Apex measurement by E.A.LRelationship between Major Apical Foramen and Apex measurement by E.A.L

Instrument Instrument + Metapex

Instrument + MetapexInstrument

Micrometer: 0.0Apex-locator : 0.0 (apex)Device model: XFRTooth type : Lower MolarCanal: MBFile: .15Date: 30/6/08 Page No. : 2

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

The ApexNRG-XFR reads “APEX” (0.00) upon reaching the apical constriction.

apical constriction

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The measurements with the ApexNRG 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.

Riding on the device =0.00

ApexNRG-BlueDevice reads: APEX (0.00)Micrometer reads: 0.00 mmDeviation: 0.00

ApexNRG-BlueDevice reads: APEX (0.00)Micrometer reads: 0.102 mmDeviation: 0.102Measured at the highest point before changing to 0.25. Actual deviation: 0.051.

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ApexNRG-BlueDevice reads: 0.25 mmMicrometer reads: 0.181 mmDeviation: 0.069

ApexNRG-BlueScreen reads: 0.375 mmMicrometer reads: 0.351 mmDeviation: 0.024

ApexNRG-BlueDevice reads: 0.50 mmMicrometer reads: 0.452 mmDeviation: 0.048

ApexNRG-BlueScreen reads: 0.60 mmMicrometer reads: 0.533 mmDeviation: 0.067

ApexNRG-BlueScreen reads: 0.70 mmMicrometer reads: 0.621 mmDeviation: 0.079

ApexNRG-BlueScreen reads: 0.80 mmMicrometer reads: 0.734 mmDeviation: 0.066

ApexNRG-BlueScreen reads: 0.90 mmMicrometer reads: 0.830 mmDeviation: 0.070

ApexNRG-BlueDevice reads: 1.00 mmMicrometer reads: 0.935 mmDeviation: 0.065

ApexNRG-XFRDevice reads: APEX (0.00)Micrometer reads: 0.000 mmDeviation: 0.000

ApexNRG-XFRDevice reads: 0.25 mmMicrometer reads: 0.222 mmDeviation: 0.028

ApexNRG-XFRDevice reads: 0.50 mmMicrometer reads: 0.437 mmDeviation: 0.013

ApexNRG-XFRDevice reads: 0.75 mmMicrometer reads: 0.726 mmDeviation: 0.024

ApexNRG-XFRDevice reads: 1.00 mmMicrometer reads: 0.810 mmDeviation: 0.190

ApexNRG-XFRDevice reads: 1.50 mmMicrometer reads: 1.345 mmDeviation: 0.155

ApexNRG-XFRDevice reads: 2.00 mmMicrometer reads: 1.818 mmDeviation: 0.182

Micrometer: 0.0 mm

ApexNRG Blue: 0.0 mm

Micrometer: 1.252 mm

ApexNRG Blue : 1.5 mm

Micrometer: -0.0011 mm

ApexNRG Blue : Past Apex