Effect of Two Post Space Depths on the Accuracy of the Scan

Objective: This study aims to measure the accuracy of post space scans using 2 post space depths 1.7millimeters 2.10millimeters. Materials and Methods: A total of 14 human mandibular premolar teeth with similar root form and root canal shape averaging cervico-occlusal length of the crown about 8+/-0.5 mm and 14.5+/-0.5 mm for root length were collected for this study , endodontic treatment was performed for all teeth followed by coronal decapitation 2mm above CEJ and post space preparation , After the preparation of each root, the corresponding teeth were allocated randomly to two groups (n=7/ group) according to the depth of the preparation. Group A: 7 mm and Group B: 10 mm. All teeth were scanned using the (inEos X5 Sirona- Germany) to produce a reference scan, then scanning of post space directly using intraoral scanner for all teeth. Results: Samples with 10 mm post space (106.19±38.94) had a significantly higher RMS value than samples with 7 mm post space (70.39±28.63) (p=0.005). Conclusion: On the basis of the results and conditions of this study, the following conclusions can be drawn, diverse depths of the post space preparation showed varying degrees of trueness compared to the reference scan. Samples with 10 mm post space had a lower trueness value than samples with 7 mm post space.