Canal Transportation, Centering Ability, and Cyclic Fatigue Promoted by Twisted File Adaptive and Navigator EVO Instruments at Different Motions

Autor(es)

Duarte, Pedro Marks ^[1] ; da Silva, Paula Barcellos ^[1] ; Alcalde, Murilo Priori ^[2] ; Vivan, Rodrigo Ricci ^[2] ; da Rosa, Ricardo Abreu ^[1] ; Hungaro Duarte, Marco Antonio ^[2] ; Reis So, Marcus Vinicius ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio Grande do Sul, Dept Conservat Dent, Porto Alegre, RS - Brazil

^[2] Univ Sao Paulo, Dept Endodont, Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENDODONTICS; v. 44, n. 9, p. 1425-1429, SEP 2018.
• Citações Web of Science: 1

Resumo

Introduction: This study compared the cyclic fatigue and the canal transportation promoted by Twisted File (TF) Adaptive and Navigator EVO systems when used with 2 different motions. Methods: Forty mesiobuccal roots of maxillary molars were scanned by using micro computed tomography imaging before and after root canal preparation with the 2 instrument systems used with 2 motions (adaptive and continuous rotation). Samples were divided into 4 groups: TFA, TF Adaptive instruments under adaptive motion; TFC, TF Adaptive instruments under continuous motion; NA, Navigator instruments under adaptive motion; and NC, Navigator instruments under continuous motion. Root canals were prepared until 35.04 instruments. Apical transportation was analyzed by using micro computed tomography at 3 levels: 3, 6, and 9 mm from the apex. The cyclic fatigue tests were performed by using a custom-made device. Ten instruments of each brand were activated by using a 6:1 reduction handpiece powered by a torque-controlled motor using the preset programs ``custom mode{''} and ``TF Adaptive{''} to activate 25.06 and 35.04 instruments. Kruskal-Wallis and Dunn tests were used to assess canal transportation, centering ability, and canal volume. The Student t test was used to evaluate cyclic fatigue (P = .05). Results: At 3 and 9 mm, the canal transportation and centering ability were similar in all groups (P > .05). At 6 mm, TFC presented higher canal transportation toward furcal region than NA and NC (P < .05). After canal preparation, TFA promoted great dentinal excision, presenting higher canal volume than NA and NC (P < .05). Higher cyclic fatigue resistance was observed under continuous than adaptive motion (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