Akademik Veri Yönetim Sistemi
IFEA 2024 World Endodontic Congress, Glasgow, İngiltere, 11 - 14 Eylül 2024, ss.1
Aim: The objective of this study was to evaluate how the formation of different type of precipitates affects the accuracy of electronic apex locators (EALs) in determining the working length.
Summary: A total of 240 extracted human maxillary anterior teeth were selected. Following the use of ProTaper Ultimate F1, F2, and F3 for root canal preparation, the actual working length (AWL) was determined using a stereomicroscope at X15 magnification. Then, teeth were divided into, a total of 8 groups; 4 groups (n:30) for the application of different irrigation solutions; saline, sodium hypochlorite (5.25% NaOCl), chlorhexidine (2% CHX) and EDTA (17% EDTA), and 4 groups (n:30) for the formation of precipitates; orange-brown (2% CHX + 5.25% NaOCl), orange-white (2%CHX + 0.16% NaOCl), white milky (2% CHX + 17% EDTA), salt (2% CHX + saline). Electronic working length (EWL) was determined with two different EALs (Propex Pixi and EndoRadar Pro). The measurements were conducted by a sole operator, who repeated the process three times. Another operator then recorded the measurements using a digital caliper. The FT-IR spectra of the precipitate were recorded on Tensor 27 model spectrophotometer at ambient temperature. The precipitate's microstructures were captured by the use of an Olympus/BX41RF optical microscope. The success rate of the 5.25% NaOCl group was higher than the white milky (2% CHX + 17% EDTA) precipitate group, within a tolerance range of 0.5 mm, for both EALs. Except the salt (2% CHX + saline) group, there was a significant difference for EndoRadar Pro between the 5.25% NaOCl group and all precipitate groups.
Key Learning Points
· The EALs were highly effective in identifying the working length, but the success rate of both devices utilized in this investigation declined as a result of the production of a white milky precipitate consisting of 2% CHX and 17% EDTA.