Accuracy of an electronic foramen locator in determining working length during retreatment: an in vitro study

Authors

  • Cauê Lassen Universidade de Santa Cruz do Sul
  • Ronise Ferreira Dotto Universidade de Santa Cruz do Sul
  • Paulo Silva dos Santos Universidade de Santa Cruz do Sul
  • Márcia Helena Wagner Universidade de Santa Cruz do Sul
  • Renata Grazziotin-Soares Universidade Federal do Rio Grande do Sul
  • Fernando Branco Barletta Universidade Luterana do Brasil

DOI:

https://doi.org/10.15448/1980-6523.2015.4.15023

Keywords:

Odontometry, Retreatment, Dental pulp cavity, Endodontics

Abstract

Objective: To assess, in vitro, the accuracy of MiniApex® for electronic working length (EWL) determination during three stages of root canal treatment/retreatment: EWL-1 (during treatment), EWL-2 (after filling removal), and EWL-3 (after reinstrumentation).
Methods: EWL was determined when the MiniApex® display showed the green light at the ‘0.5’ mark and compared with radiographic findings. Results were classified as accurate when the file tip was located in a range of (1) 0.5 to 1.0 mm and (2) 0.5 to 2.0 mm from the radiographic apex, and as inaccurate when the file tip was outside that range of values. Means were compared between groups considering all values and only accurate measurements, for both tolerance limits.
Results: MiniApex® was highly accurate at the larger tolerance range (0.5 2.0mm): 82.3% (EWL-1), 88.2% (EWL-2), and 91.1% (EWL-3). During root canal retreatment, EWL-3 provided more accurate measurements than EWL-2, but without statistical difference (p>0.05). There was no statistical difference (p>0.05) when only accurate measurements were evaluated.
Conclusion: MiniApex® was highly accurate to determine the location of the instrument tip at 0.5 to 2.0mm from the radiographic apex during treatment and retreatment (EWL-2 and EWL-3).

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2016-01-15

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