Effectiveness and safety of three NiTi systems in endodontic retreatment of MB1 and MB2 root canals: a micro-CT and CBCT combined analysis

Author(s)

Santos Jr, Airton Oliveira ; Fontenele, Rocharles Cavalcante ; Tavares, Karina Ines Medina Carita ; Torres, Fernanda Ferrari Esteves ; Pinto, Jader Camilo ; Rosim, Pedro Luis Busto ; Goncalves, Andrea ; Duarte, Marco Antonio Hungaro ; Guerreiro-Tanomaru, Juliane Maria ; Tanomaru-Filho, Mario

• Document type: Journal article
• Source: CLINICAL ORAL INVESTIGATIONS; v. 29, n. 4, p. 15-pg., 2025-03-19.

Abstract

Objective To evaluate the performance in endodontic retreatment and pericervical dentin preservation using ProDesign Logic (PDL), Reciproc Blue (RB), and WaveOne Gold (WOG) NiTi systems in first (MB1) and second (MB2) mesiobuccal root canals of maxillary molars, using cone-beam computed tomography (CBCT) and micro-computed tomography (micro-CT). Materials and methods MB1 and MB2 canals were prepared, filled, and randomized into four groups (n = 8). MB1 were retreated using PDL up to file 40/0.05 or RB R40 (40/0.06), while MB2 were retreated using PDL up to file 35/0.05 or WOG (35/0.06). Micro-CT scans were performed before and after retreatment to assess the remaining filling material, canal transportation, and canal centralization. Dentin removal and remaining dentin were measured at four levels below the furcation through CBCT scans analyzed with the e-Vol DX software, with micro-CT serving as the reference standard. Results RB was more effective than PDL in removing MB1 filling material, while PDL outperformed WOG in the apical third of MB2 (p < 0.05). Overall, CBCT measurements for dentin removal were consistent with micro-CT in MB1 but occasionally underestimated in MB2 (p < 0.05). A significant reduction in MB2 danger zone dentin thickness below 0.5 mm was observed after retreatment (p < 0.05). Conclusions RB was more effective in retreating MB1, while PDL was more efficient in the apical third of MB2. A substantial decrease in dentin thickness in the MB2 danger zone was noted after retreatment, regardless of the NiTi system or imaging modality used. Overall, CBCT scans provided consistent assessments of dentin. (AU)

• FAPESP's process: 20/11012-3 - Comparative evaluation between micro-CT and CBCT using the e-Vol DX software in the analysis of obturation in oval canals and dentinal thickness in MB1 and MB2 canals of maxillary molars after preparation and retreatment
• Grantee: Airton Oliveira Santos Junior
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 23/13106-3 - Development of intracanal medications, gutta-percha and endodontic cement with tricalcium silicate, biosilicate and associations. Assessment of physicochemical, biological and antimicrobial properties
• Grantee: Juliane Maria Guerreiro Tanomaru
• Support Opportunities: Regular Research Grants
• FAPESP's process: 22/13774-3 - Artificial Intelligence-drive tool for automatic segmentation of endodontic structures in cone-beam computed tomography images
• Grantee: Airton Oliveira Santos Junior
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 21/11496-3 - Synthesis of new reparative biomaterial, evaluation of calcium silicate materials and analysis of the effect of the application of bioglass in the treatment of dentin and in the coating of Gutta percha in the interaction with bioceramic root canal sealers
• Grantee: Mario Tanomaru Filho
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/11011-7 - Physicochemical and biological characteristics of clinker with different particle sizes besides root repair cements and root canal sealers based on calcium silicate
• Grantee: Karina Ines Medina Carita Tavares
• Support Opportunities: Scholarships in Brazil - Doctorate