Defense Date


Document Type


Degree Name

Master of Science in Dentistry



First Advisor

Dr. Garry Myers

Second Advisor

Dr. Caroline Carrico

Third Advisor

Dr. Duane Schafer


CanalPro Electronic Apex Locator Accuracy Compared to the Root ZX Electronic Apex locator

Benjamin Brown, Garry Myers, Caroline Carrico, Duane Schaefer

Department of Endodontics, Virginia Commonwealth University

Objectives: Electronic apex locators (EAL) are an effective instrument in measuring the working length of a canal. The Root ZX is considered the gold standard by many. The aim of this research is to compare the accuracy of the CanalPro EAL to the Root ZX.

Methods: The actual length of 43 single rooted extracted teeth were measured with a #10 hand file when the tip was visualized at the foramen under a microscope. The EAL was then hooked up to a jig, with the tooth in saline, and a #10 hand file was placed in the canal. The working length was determined by using the 0.5 mm mark on both the CanalPro and Root ZX EAL.

Results: With the Root ZX, 74% of the teeth were within 0.5mm of the actual length (32/43). For the CanalPro, 65% were within 0.5mm (28/43). Neither the CanalPro nor the RootZX were deemed equivalent based on the preset equivalence bounds of +/- 0.5mm.

Conclusions: According to this study, both the Root ZX and the CanalPro are clinically acceptable for determining the apical limit for root canal therapy when using the ‘0.5’ mark, however it is advised that a MAF or MAC radiograph to confirm that instrumentation and obturation are within the confines of the canal. If using the ‘Apex’ mark on the EAL, then 1 mm should be subtracted from this length to ensure the limit of cleaning, shaping, and obturation are within the confines of the AC.


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