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European Archives of Paediatric Dentistry

, Volume 14, Issue 6, pp 369–374 | Cite as

Formulating a regression equation for determination of working length in primary molars using apex locators: a clinical study

  • A. DandempallyEmail author
  • R. Muppa
  • M. K. Duddu
  • P. Bhupatiraju
  • S. Nallanchakrava
Original Scientific Article

Abstract

Objective

The aim of this study was to formulate a regression equation for calculating working lengths in primary molars using EAL (Root ZX and Ipex) for teeth with and without resorption and to evaluate, in vivo, the accuracy of the electronic apex locators in determining working lengths in primary teeth with and without resorption in comparison with Ingles radiographic method.

Study design

The study was a cross-over study. Fifty children undergoing pulpectomy in primary mandibular molars (total 150 root canals) with and without resorption were evaluated. The actual length of each root was measured with Ingles radiographic method followed by the use of two generations of apex locators. The distances were measured with radiographs, apex locators and working lengths tabulated. Frequency distribution of working length from radiographic apex and their percentages were calculated. Pearson’s correlation coefficient was used to assess the closeness of the measurements to radiographic apex with or without resorption followed by formulating regression equations.

Results

It was observed that 131 (87.33 %) of the 150 readings with Root ZX, and 122 (81.33 %) of the 150 readings with IPEX were within 0.0–1.0 mm of the radiographic readings. Root ZX gave 96.77 % (30) and IPEX gave 90.32 % (28) of 31 acceptable readings (within 0.0–1.0 mm of the radiographic apex) in resorption cases. Measurements with apex locator and radiographic methods were highly correlated.

Conclusion

Apex locators are reliable when compared with Ingles radiographic method and can enhance the safety of treatment in specific situations such as presence of root resorption. In case of non-availability of apex locators, the equations given in our study can be of use.

Keywords

Primary teeth Resorption Working length Regression equation 

Notes

Conflict of interest

The authors deny any conflicts of interest.

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Copyright information

© European Academy of Paediatric Dentistry 2013

Authors and Affiliations

  • A. Dandempally
    • 1
    Email author
  • R. Muppa
    • 1
  • M. K. Duddu
    • 1
  • P. Bhupatiraju
    • 1
  • S. Nallanchakrava
    • 1
  1. 1.Department of Paediatric DentistryPanineeya Mahavidyalaya Institute of Dental Sciences and Research CentreHyderabadIndia

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