Evaluation of apical transportation and centring ability of five thermally treated NiTi rotary systems

Autor(es)

Pinheiro, S. R. ; Alcalde, M. P. ^[1] ; Vivacqua-Gomes, N. ^[2] ; Bramante, C. M. ^[1] ; Vivan, R. R. ^[1] ; Duarte, M. A. H. ^[1] ; Vasconcelos, B. C. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Bauru Dent Sch, Dept Dent Endodont & Dent Mat, Bauru, SP - Brazil

^[2] Sao Leopoldo Mandic Univ, Sch Dent Ceara, Fortaleza, CE - Brazil

^[3] Univ Fed Ceara, Sch Dent Sobral, Campus Sobral, BR-62010590 Sobral, CE - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Endodontic Journal; v. 51, n. 6, p. 705-713, JUN 2018.
• Citações Web of Science: 9

Resumo

AimTo evaluate apical transportation and centring ability during root canal preparation in mesial root canals of mandibular molars associated with ProTaper Gold (PTG), ProDesign S (PDS), Hyflex CM (HCM), Hyflex EDM and ProDesign Logic (PDL). MethodologySixty mandibular first molars with two separate canals in the mesial root were selected after root anatomy pairing by microcomputed tomography (microCT). The teeth were randomly divided into five groups (n=24); the root canal volume was calculated to ensure sample homogeneity. All the root canals were prepared up to size 25 in accordance with the instructions of each rotary system manufacturer. After root canal preparation, the teeth were scanned by microCT to analyse apical transportation, root canal centralization and the pre- and post-preparation rootcanal volume at the apical and cervical levels. Kruskal-Wallis and Dunn tests were used for comparisons amongst groups for transportation values. For volume changes, the parametric ANOVA and Tukey's tests were used ResultsThere were no significant differences in apical transportation amongst the rotary systems (P>0.05). All the systems created apical transportation; values ranging from 0.031mm (PDL) to 0.072mm (PTG), and enlargements between 39% (HCM) and 91.1% (PDS) were observed. In relative to cervical transportation, significant differences were observed amongst the systems (P<0.05). Mean transportation values between 0.07mm (HCM) and 0.172mm (PTG) were found, with enlargements between 35.4% (HCM) and 51.5% (PDS). ConclusionAll the thermally treated systems resulted in similar apical transportation. In the cervical region, the Hyflex CM and Prodesign Logic systems were associated with more centred preparations. (AU)

• Processo FAPESP: 16/00245-1 - Avaliação das propriedades físico-químicas de um cimento experimental à base de agregado trióxido mineral, determinação de sua compatibilidade com um novo sistema de obturação, e da qualidade e estabilidade de obturações realizadas com o mesmo
• Beneficiário: Bruno Carvalho de Vasconcelos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado