Document Type : Original Article
Authors
1
PHD Researcher, Fixed Prosthodontics Department, Faculty of Dentistry, Minia University, Minia, Egypt.
2
Professor of Fixed Prosthodontics, Faculty of Dentistry, Minia University, Egypt.
3
Associate Professor, Fixed Prosthodontics Department, Faculty of Dentistry, Minia University, Minia, Egypt.
Abstract
Background: Digital impressions using intraoral scanners have gained popularity as a favorable alternative to conventional techniques for capturing post space morphology. However, their performance can be influenced by the geometric complexity of the prepared canal.
Aim of the study: To investigate how variations in post space diameter and depth affect the trueness of digital impressions obtained with an intraoral scanner.
Materials and Methods: Twenty endodontically treated maxillary canines were allocated into two groups based on post space diameter: Group C (1.5 mm) and Group D (1.7 mm) (n = 10 each). Each group was subdivided by depth into Subgroup S (6 mm) and Subgroup D (10 mm) (n = 5), resulting in four subgroups: CS (1.5 mm, 6 mm), CD (1.5 mm, 10 mm), DS (1.7 mm, 6 mm), and DD (1.7 mm, 10 mm). Specimens were scanned using the Medit i700 intraoral scanner, and reference scans were obtained from conventional impressions digitized with the InEos X5 scanner. Trueness was assessed using 3D metrology software, and data were analysed using two-way ANOVA followed by Tukey’s post-hoc test (p < 0.05).
Results: Both post space diameter and depth had a statistically significant effect on scan trueness (p < 0.05). Dilated diameter canals exhibited higher trueness values, while deeper preparations showed a notable reduction in trueness.
Conclusions: Within the limitations of this study, dilated post space diameter and shallow preparation depth were associated with improved scan trueness. All tested subgroups demonstrated clinically acceptable accuracy.
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