Acurácia do escaneamento de condutos radiculares em diferentes profundidades: uma análise de cinco scanners intraorais

Abstract

Purpose: To evaluate the accuracy and trueness of intraoral scanning of weakened single-rooted bovine teeth at different canal depths (6, 9, 12, and 15 mm), comparing the volumes obtained by intraoral scanners with those determined by micro–computed tomography (micro-CT), considered the gold standard. Materials and methods: Four bovine teeth with an apical lumen of up to 1.3 mm were selected, subjected to endodontic treatment, and randomly allocated into four groups according to canal depth (6, 9, 12, and 15 mm). The specimens were weakened, maintaining a circumferential dentin thickness of 2 mm and a depth of 4 mm. Each sample was scanned ten times using five intraoral scanners: Primescan (P), 3Shape (3S), Dexis IS 3700 (D), Straumann Sirios (S), and Straumann Virtuo Vivo (V). For each depth, microCT was performed to obtain the true volume. The STL files were imported into Meshmixer® for standardized alignment and trimming and subsequently imported into MeshLab® for volumetric analysis. Results: At depths of 6 and 9 mm, all scanners showed positive ΔV values, indicating larger volumes compared with micro-CT. However, at a depth of 12 mm, scanners D, S, and V exhibited negative ΔV values. At a depth of 15 mm, scanners 3S, D, S, and V also showed negative ΔV values, indicating greater volumetric distortion in deeper regions. Conclusion: Scanning depth significantly influences the accuracy and trueness of intraoral scanners in the digitization of intraradicular canals, with reduced performance at greater depths, even under favorable geometric conditions.