A simple mounting model for consistent determination of the accuracy and repeatability of apex locators
- 2 February 2006
- journal article
- research article
- Published by Wiley in International Endodontic Journal
- Vol. 39 (2), 108-112
- https://doi.org/10.1111/j.1365-2591.2006.01052.x
Abstract
To develop a precise and simple mounting model (MM) for evaluating apex locators and to compare the repeatability of the MM with a conventional visual method (VM). Electronic working length determination was performed in 32 maxillary central incisors using two methods: (i) the MM method and (ii) a conventional VM. The MM utilizes a micrometer to determine the distance travelled by the measuring file during working length determination. In the VM, the length of the measuring file (representing the working length) is determined visually using a caliper and a microscope at 6x magnification. Each measurement was repeated once. The repeatability of each method was evaluated by calculating the coefficient of repeatability. The coefficient of repeatability, which includes 95% of the differences between repeated measurements, was 0.04 mm for MM compared with 0.9 mm for VM. The measurement error of MM was significantly lower than VM (0.02 and 0.4 mm respectively). There was a statistically significant difference between the means of absolute difference in repeated measurements: MM 0.01 mm (95% confidence interval (CI): 0.01; 0.02 mm) compared with VM 0.4 mm (95% CI: 0.3; 0.5 mm). The new MM had superior repeatability in comparison with the conventional method where visual interpretation is a source of inaccurate measurement.Keywords
This publication has 13 references indexed in Scilit:
- Determining the apical terminus of root-end resected teeth using three modern apex locators: a comparative ex vivo studyInternational Endodontic Journal, 2005
- Image processing for craniofacial landmark identification and measurement: a review of photogrammetry and cephalometryComputerized Medical Imaging and Graphics, 2004
- Electronic apex locatorsInternational Endodontic Journal, 2004
- An In Vivo Comparison of Two Frequency-based Electronic Apex LocatorsJournal of Endodontics, 2003
- The Ability of Root ZX Apex Locator to Reduce the Frequency of Overestimated Radiographic Working lengthJournal of Endodontics, 2002
- Influence of the Canal Contents on the Electrical Assisted Determination of the Length of Root CanalsJournal of Endodontics, 2002
- Reproducibility of cephalometric landmarks on conventional film, hardcopy, and monitor-displayed images obtained by the storage phosphor techniqueEuropean Journal of Orthodontics, 1998
- Statistics Notes: Measurement errorBMJ, 1996
- STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENTThe Lancet, 1986
- A critical evaluation of some methods of determining tooth lengthOral Surgery, Oral Medicine, Oral Pathology, 1974