Isabelle L L Gomes1, Flávio R F Alves2,3, Marília F Marceliano-Alves2, Stephanie B Silveira1, Júlio Cézar N Sousa4, José Claudio Provenzano5,6, Lucio Souza Gonçalves1. 1. Postgraduate Program in Dentistry, Estácio de Sá University, Rio de Janeiro, Brazil. 2. Faculty of Dentistry, Department of Endodontics, Iguaçu University (UNIG), Av. Abílio Augusto Távora, 2134 - Luz, Nova Iguaçu, RJ, 26260-045, Brazil. 3. Postgraduate Program in Dentistry, University of Grande Rio (UNIGRANRIO), Rio de Janeiro, RJ, Brazil. 4. Faculty of Dentistry, Department of Endodontics, University Center of João Pessoa, Paraíba, Brazil. 5. Faculty of Dentistry, Department of Endodontics, Iguaçu University (UNIG), Av. Abílio Augusto Távora, 2134 - Luz, Nova Iguaçu, RJ, 26260-045, Brazil. odontojcp@gmail.com. 6. Postgraduate Program in Dentistry, University of Grande Rio (UNIGRANRIO), Rio de Janeiro, RJ, Brazil. odontojcp@gmail.com.
Abstract
OBJECTIVE: To assess apical root canal transportation using Mtwo or Reciproc during retreatment of severely curved canals, using a multi-analytical approach. METHODS: Forty mesial canals from mandibular molars (Vertucci type IV) were evaluated before and after endodontic retreatment to compare apical transportation with Mtwo retreatment or Reciproc. The systems were used on the same root but alternating the mesial canals. The analyses were performed by micro-computed tomography. Four evaluations were performed: (a) longitudinal transportation, (b) horizontal transportation, (c) variation in the angle of curvature of the canal, and (d) canal-root width ratio. Horizontal transportation and canal-root width ratio were evaluated in 1-, 3-, and 5-mm levels. RESULTS: Longitudinal transportation occurred in all samples, with a mean of 0.13 mm for Mtwo and 0.17 mm for Reciproc. Horizontal transportation increased as distant from the apex was the evaluated level, in mean. However, the transport was not observed in all samples. The mean angle of curvature was 4.16 for Mtwo and 3.03 for Reciproc. Canal-root width decreased as distant from the apex was the evaluated level. No significant differences were observed considering all tested variables, independently of the retreatment system or evaluated level (p > 0.05). CONCLUSION: Mtwo retreatment and Reciproc presented similar apical transportation (horizontal or vertical). CLINICAL RELEVANCE: Both Mtwo retreatment and Reciproc systems could be considered safe regarding apical transportation.
OBJECTIVE: To assess apical root canal transportation using Mtwo or Reciproc during retreatment of severely curved canals, using a multi-analytical approach. METHODS: Forty mesial canals from mandibular molars (Vertucci type IV) were evaluated before and after endodontic retreatment to compare apical transportation with Mtwo retreatment or Reciproc. The systems were used on the same root but alternating the mesial canals. The analyses were performed by micro-computed tomography. Four evaluations were performed: (a) longitudinal transportation, (b) horizontal transportation, (c) variation in the angle of curvature of the canal, and (d) canal-root width ratio. Horizontal transportation and canal-root width ratio were evaluated in 1-, 3-, and 5-mm levels. RESULTS: Longitudinal transportation occurred in all samples, with a mean of 0.13 mm for Mtwo and 0.17 mm for Reciproc. Horizontal transportation increased as distant from the apex was the evaluated level, in mean. However, the transport was not observed in all samples. The mean angle of curvature was 4.16 for Mtwo and 3.03 for Reciproc. Canal-root width decreased as distant from the apex was the evaluated level. No significant differences were observed considering all tested variables, independently of the retreatment system or evaluated level (p > 0.05). CONCLUSION: Mtwo retreatment and Reciproc presented similar apical transportation (horizontal or vertical). CLINICAL RELEVANCE: Both Mtwo retreatment and Reciproc systems could be considered safe regarding apical transportation.
Authors: Giselle Nevares; Diana S de Albuquerque; Laila G Freire; Kaline Romeiro; Howard M Fogel; Marcelo Dos Santos; Rodrigo S Cunha Journal: J Endod Date: 2016-05 Impact factor: 4.171