Bruno Carvalho Vasconcelos1, Luzia Mesquista Bastos2, Ariany Souza Oliveira2, Ricardo Affonso Bernardes3, Marco Antonio Hungaro Duarte4, Nilton Vivacqua-Gomes5, Rodrigo Ricci Vivan4. 1. School of Dentistry of Sobral, Federal University of Ceará, Campus Sobral, Sobral, Ceará, Brazil. Electronic address: bcv@ufc.br. 2. School of Dentistry of Sobral, Federal University of Ceará, Campus Sobral, Sobral, Ceará, Brazil. 3. Brazilian Dental Association, Taguatinga, Federal District, Brazil. 4. Department of Dentistry, Endodontics and Dental Materials, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil. 5. School of Dentistry of Ceará, São Leopoldo Mandic University, Campus Fortaleza, Fortaleza, Ceará, Brazil.
Abstract
INTRODUCTION: The aim of this study was to determine the variations in root canal length (RCL) occurring during endodontic treatment stages (initial, preflared, and concluded) and correlate them with the accuracy of Root ZX II (RZX). METHODS: After coronal access, 26 mandibular molars had the apical foramen of the 52 mesial canals standardized (250 μm) and their respective initial RCL was recorded (RCL1 = initial) by using a clinical microscope (×16) and manual K-file instruments. By using the alginate model, sequential electronic measurements were taken with the RZX. After the initial measurement (EM1), WaveOne Primary instruments were used to prepare the cervical and middle thirds of the root canals, and then the second RCL and EM measurements (RCL2/EM2 = preflared) were obtained. Finally, mechanical preparation was concluded, and the measurement procedures were repeated to obtain the final RCL and EM measurements (RCL3/EM3 = concluded). RESULTS: Statistically significant differences were observed in all comparisons in the RCL (P < .05). The RCL1 - RCL3 showed the highest variation (0.6 mm), with the extent of specimens reduced by up to 1.75 mm. No statistically significant differences were found in the accuracy of the RZX (P > .05); 100% precision (± 0.5 mm) was found in all stages. CONCLUSIONS: Under the conditions of this study, the authors concluded that during endodontic treatment, the extent of the RCL was reduced, thereby jeopardizing control of the apical limit during instrumentation and/or obturation. The RZX was extremely accurate in all evaluated stages.
INTRODUCTION: The aim of this study was to determine the variations in root canal length (RCL) occurring during endodontic treatment stages (initial, preflared, and concluded) and correlate them with the accuracy of Root ZX II (RZX). METHODS: After coronal access, 26 mandibular molars had the apical foramen of the 52 mesial canals standardized (250 μm) and their respective initial RCL was recorded (RCL1 = initial) by using a clinical microscope (×16) and manual K-file instruments. By using the alginate model, sequential electronic measurements were taken with the RZX. After the initial measurement (EM1), WaveOne Primary instruments were used to prepare the cervical and middle thirds of the root canals, and then the second RCL and EM measurements (RCL2/EM2 = preflared) were obtained. Finally, mechanical preparation was concluded, and the measurement procedures were repeated to obtain the final RCL and EM measurements (RCL3/EM3 = concluded). RESULTS: Statistically significant differences were observed in all comparisons in the RCL (P < .05). The RCL1 - RCL3 showed the highest variation (0.6 mm), with the extent of specimens reduced by up to 1.75 mm. No statistically significant differences were found in the accuracy of the RZX (P > .05); 100% precision (± 0.5 mm) was found in all stages. CONCLUSIONS: Under the conditions of this study, the authors concluded that during endodontic treatment, the extent of the RCL was reduced, thereby jeopardizing control of the apical limit during instrumentation and/or obturation. The RZX was extremely accurate in all evaluated stages.
Authors: Carlos G Adorno; Sandra M Solaeche; Ileana E Ferreira; Andrea Pedrozo; Patricia M Escobar; Vicente R Fretes Journal: Clin Oral Investig Date: 2021-02-13 Impact factor: 3.573
Authors: Bernardo Almeida Aguiar; Rafael Santos Reinaldo; Luciana Maria Arcanjo Frota; Mônica Sampaio do Vale; Bruno Carvalho de Vasconcelos Journal: Int J Dent Date: 2017-03-07