- Purpose: To evaluate, in vivo, the measurement accuracy in vital and necrotic canals by means of the Endex (Osada Electric Co., Los Angeles, CA) apex locator.
- N=33 teeth destined for extraction (single-rooted maxillary or mandibular teeth with mature apices).
- RGs were taken to determine whether or not a PAL and/or resorption is present.
- Teeth were tested using an Analytic Technology pulp tester, a carbon dioxide ice pencil, percussion, and palpation.
- 17 teeth were determined to be vital and 16 were necrotic.
- L.A, R.D and access cavity
- Canals were irrigated using 5.25% sodium hypochlorite and were not dried prior to insertion of the measurement file.
- A file (between a #15 and a #35) was inserted within 2 to 3 mm of the radiographic apex.
- Once the Endex indicated the apex, another RG was taken.
- Self-curing composite was injected into the remaining canal space, the tooth was extracted and stored in formalin.
Most highlighted Results:
- All measurements were made from the major diameter because it was reproducible and consistent.
- Vital Vs. necrotic cases (Table)
- No significant difference between the means of the vital and the necrotic cases.
Each operator should correlate his own radiographic and clinical findings with the analog dial readings on the instrument to determine exactly where the apical constriction is.