Maria Sikander, Alia Ahmed, Sana Jalil.
Accuracy of electronic apex locator in determining the working length in primary molars with root resorption: an in vitro study.
Pak Oral Dental J Jan ;34(4):711-3.

For successful endodontic outcome, correct working length has to be determined. The third generation apex locators claim to be accurate regardless of physiologic root resorption. The objective of the study was to determine in vitro the accuracy of Dentaport ZX (third generation apex locator) in determining the working length of primary molars with root resorption. Thirty-two extracted primary molars with root resorption were obtained for this study. After ascertaining the direct working length, Dentaport ZX was used to determine the working length of roots of primary molars with root resorption .The Dentaport ZX was 86.9% accurate in determining working length within ±0.0mm of coronal limit of resorbed primary molar root when compared with direct method. The accuracy of Dentaport ZX in measuring working length in primary molars was high and was not affected by physiologic root resorption.

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