جستجوی مقالات مرتبط با کلیدواژه « آپکس یاب الکترونیکی » در نشریات گروه « پزشکی »

Determining and maintaining working length during root canal shaping is one of the crucial steps for successful root canal treatment. The aim of this study was to evaluate the accuracy and coefficient of repeatability of two electronic apex locators(Root ZX and Smarpex) in locating the apicalforamen.

In this cross-sectional laboratory study, thirty single-rooted extracted teeth were selected and the root canals were coronally flared. Actual canal lengths were determined by inserting a #15 file until the tip was visualized (10x magnification) just within the apical foramina. Teeth were mounted in alginate and were randomly tested with each electronic apex locator (EAL) to determine the electronic canal length. Each measurement was repeated. Differences between the electronic and actual canal lengths were analyzed by using T-test via SPSS software( version 18). The repeatability of each EAL was evaluated by calculating the coefficient of repeatability.

The coefficient of repeatability of both devices were acceptable: Root ZX, 0.04 mm and Smarpex , 0.02 mm. Mean distances from the tip of the files to the apical foramens were 0.06 mm (SD 0.52) for Root ZX, 0.99 mm (SD 1.13) for the Smarpex. Accuracy of Root ZX in locating apical foramen was significantly better than Smarpex (p<0.001).

Under the conditions of this study, Root ZX was accurate and had a high coefficient of repeatability in determining the apical foramen. Although the Smarpex had a high coefficient of repeatability, it was not accurate in locating the apical foramen.

Radiography is the most common method for measurement of working length، though it is not the ideal method because of technical problems، radiation hazard، superimposition of permanent teeth bud on primary teeth، and so on. Electronic Apex Locator (EAL) is a device for determination of working length. Therefore، this study aimed to compare the accuracy of an electronic apex locator and radiography for determining working length of primary necrotic molars.

sixty canals of twenty necrotic mandibular primary molars were used in children with 5-7 years old. There were no calcified canal، previous root canal therapy and perforation of pulp chamber floor. Access cavity was prepared and working length was determined by means of NSK EAL and conventional radiography and then was compared. Moreover، Pulpectomy was completed. Data were analyzed by Paired Samples T test.

In 56 (93. 3%) of the canals، the length measured by NSK EAL was determined to be equal to the length measured by radiography. In 3 canals (5%)، NSK measurements were found to be less than radiography measurements for 1mm and in 1 canal (1. 7%)، it was greater than radiography measurements for 1mm. T test analysis indicated no significant difference between the two measurement methods (p=0. 85).

Electronic apex locator can accurately assess the length of canals in primary molars.

Assessment of the length of root canal is the first and the most important step of a successful root canal therapy (RCT). Although radiography is the most common technique in working length determination، it is not the technique of choice due to its limitations. Electronic apex locator has been used to solve the problem.

The purpose of this study was to compare the in vitro accuracy of two electronic apex locators Raypex5 and Foramatron in determination of working length.

This analytical study was performed in Qazvin dental school in 2005. 30 extracted single canal teeth were selected and the access cavity was prepared for them. The working length measured by two apex locators in dry and wet situation was compared to actual canal length that was determined under stereomicroscope. Data were analyzed by paired t-test.

The accuracy of Raypex5 working length determination was 86. 7% and 76. 7%، respectively، in dry and wet situation for a tolerance limit of 0-0. 5 mm. The accuracy of Formatron working length determination was 73. 4% and 63. 4% and there was no statistically significant difference between the accuracy of the instruments.

Although the accuracy of Raypex5 in working length determination was more than Foramatron، both of them are useful as an adjunct to radiography in working length measurement.