Cleaning and Shaping Oval Canals with 3 Instrumentation Systems: A Correlative Micro–computed Tomographic and Histologic Study

• Published in: Journal of endodontics Vol. 43; no. 11; pp. 1878 - 1884
• Main Authors: Lacerda, Mariane F.L.S., Marceliano-Alves, Marília F., Pérez, Alejandro R., Provenzano, José C., Neves, Mônica A.S., Pires, Fábio R., Gonçalves, Lucio S., Rôças, Isabela N., Siqueira, José F.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.11.2017
• Subjects: Cleaning and shaping; Dental Pulp Cavity - diagnostic imaging; Dental Pulp Cavity - pathology; Dentistry; endodontic treatment; histology; Humans; micro–computed tomography; Molar - diagnostic imaging; Molar - pathology; Radiography, Dental; Root Canal Preparation - instrumentation; Root Canal Preparation - methods; X-Ray Microtomography; micro–computed tomography; histology; endodontic treatment; Cleaning and shaping
• ISSN: 0099-2399; 1878-3554
• DOI: 10.1016/j.joen.2017.06.032

The present study evaluated the cleaning and shaping ability of 3 instrumentation systems in oval canals of extracted vital teeth using a correlative analytic approach. Oval distal canals from 33 freshly extracted mandibular molars with pulp vitality were scanned by micro–computed tomographic (micro-CT) imaging for sample selection. Specimens matched by anatomic similarities were distributed into 3 experimental groups according to the instrument system to be evaluated: the Self-Adjusting File (SAF; ReDentNOVA, Ra'anana, Israel), TRUShape (Dentsply Sirona, Tulsa, OK), and XP-endo Shaper (FKG Dentaire, La Chaux-de-Fonds, Switzerland). The irrigant was 5.25% sodium hypochlorite heated at 37°C. After rescanning with micro-CT imaging, the unprepared surface areas were identified, measured, and then histologically evaluated for the amount of pulp remnants in each root third. When the apical 4-mm canal segment was evaluated, the SAF exhibited significantly less unprepared areas than the XP-endo Shaper (P < .05), and there were no significant differences for the other comparisons (P > .05). Analysis of the full canal length showed no statistically significant differences between the 3 tested systems (P > .05). Likewise, the tested systems did not differ significantly in cleaning the unprepared walls (P > .05). There was no significant difference in the amount of unprepared surface areas between the 3 instrument systems, except for the comparison between the SAF and XP-endo Shaper in the apical 4-mm segment. None of them prepared 100% of the root canal walls. The cleaning ability of the 3 systems was similar. •The mean unprepared apical areas ranged from 10% (SAF) to 18% (XP-endo Shaper).•SAF exhibited less unprepared areas than XP-endo Shaper in the apical canal.•In the full canal length, the amount of prepared walls was similar for the 3 systems.•The 3 instrument systems displayed similar behavior in terms of cleaning.