The ability of three nickel-titanium mechanized systems to negotiate and shape MB2 canals in extracted maxillary first molars: a micro-computed tomographic study

Autor(es)

Camargo, E. J. ^[1] ; Duarte, M. A. H. ^[2] ; Marques, V. A. S. ^[2] ; So, M. V. R. ^[3] ; Duque, J. A. ^[2] ; Alcalde, M. P. ^[2] ; Vivan, R. R. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Ctr Varzea Grande UNIVAG, Div Endodont, Coll Dent, Varzea Grande, Matogrosso - Brazil

^[2] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Al Octavio Pinheiro Brisola 9-75, BR-17012901 Bauru, SP - Brazil

^[3] Rio Grande do Sul Fed Univ, Dept Operat Dent, Porto Alegre, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Endodontic Journal; v. 52, n. 6, p. 847-856, JUN 2019.
• Citações Web of Science: 4

Resumo

Aim To evaluate the influence of three engine-driven NiTi file systems manufactured from different NiTi alloys for the preparation of second mesiobuccal (MB2) canals in extracted maxillary first molars using a micro-computed tomographic (micro-CT) scanner. Methodology Thirty maxillary molars with two canals in the mesiobuccal root were selected and randomly divided into three groups (n = 10): Reciproc {[}REC; size 25, .08 taper; VDW, Munich, Germany], ProDesign R {[}PDR; size 25, .06 taper; Easy, Belo Horizonte, Brazil] and Mtwo {[}MO; size 25, .06 taper; VDW, Munich, Germany]. Before and after root canal preparation of the MB2 canal, the teeth were scanned using a micro-CT to evaluate canal transportation, centring ability, dentine thickness and volume change. The working time to achieve working length was also evaluated. All parameters were compared statistically using the Kruskal-Wallis and Dunn test for multiple comparisons, with a significance level of 5%. Results There was no significant difference amongst the groups regarding canal transportation and centring ability (P > 0.05). However, the PDR size 25, .06 taper group had significantly lower canal volume and volume of dentine removal compared with a MO size 25, .06 taper and REC size 25, .08 taper (P < 0.05). A root perforation was detected in MO size 25, .06 taper and REC size 25, .08 taper groups, respectively. Regarding the working time, the PDR size 25, .06 taper required a significantly longer time to achieve working length than MO size 25, .06 taper and REC size 25, .08 taper (P < 0.05). Conclusions All NiTi systems had similar canal transportation, centring ability and increase in apical volume after preparation of MB2 canals. However, the PDR size 25, .06 taper had less volume of dentine removal, absence of root canal perforation and required a longer time to accomplish the root canal preparation. (AU)

• Processo FAPESP: 14/25520-0 - Avaliação das propriedades químicas, resistência torcional e flexural, caracterização geométrica e superficial de instrumentos endodônticos em função do tratamento da liga: análise após 3 vezes simulando uso clínico
• Beneficiário: Rodrigo Ricci Vivan
• Modalidade de apoio: Auxílio à Pesquisa - Regular