(PR81) Evaluation of the Working Length Determination Using a Dedicated Software for 3D Endodontic Treatment Planning

Abstract: This ex vivo study evaluated the accuracy of Sicat software (Sicat, Bonn, Germany) to determine the working length when using pre-operative cone-beam computed tomography (CBCT) scans with or without the superimposed computerized optical impression, compared to the use of a conventional CBCT software (Horos). Eighty-four extracted human mandibular incisors were selected and mounted in jigs. Pre-operative CBCTs and optical scans were taken. CBCT scans were imported into Horos software, and the canals were measured from the incisal border to the apical foramen. Then, using Sicat software, measurements were obtained using the Endoline tool, with and without the superimposed optical impression. After endodontic access, the canals' actual length (AL) was measured by inserting a size 10 manual file up to the apical foramen (AF) under magnification. Data were statistically analyzed with the significance set at 5%. No difference was found regarding the mean CBCT measurements compared to the respective actual lengths of the canals (ANOVA, p>.05). However, when comparing the differences between CBCT measurements to the gold standard, Horos presented a higher percentage of underestimated measurements (p <.05). Measurements ranging ±0.5mm from the AF were obtained in 78.6% and 76.2% of the cases, respectively, for Sicat with or without the optical scan and 48.8% for Horos (p <.05). Within the limitations of this laboratory study, the pre-operative working length determination of mandibular incisors using Sicat software was considered adequate regardless of the addition of an optical scan.