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A simple mounting model for consistent determination of the accuracy and repeatability of apex locators.

Abstract：

AIM: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). METHODOLOGY: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. RESULTS: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). CONCLUSION:The new MM had superior repeatability in comparison with the conventional method where visual interpretation is a source of inaccurate measurement.

journal_name

Int Endod J

journal_title

International endodontic journal

authors

ElAyouti A,Löst C

doi

10.1111/j.1365-2591.2006.01052.x

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

108-12

issue

2

eissn

0143-2885

issn

1365-2591

pii

IEJ1052

journal_volume

39

pub_type

杂志文章

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