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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Debris extrusion and foraminal deformation produced by reciprocating instruments made of thermally treated NiTi wires

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Arcanjo Frota, Myrna Maria [1] ; Bernardes, Ricardo Affonso [2] ; Vivan, Rodrigo Ricci [3] ; Vivacqua-Gomes, Nilton [4] ; Hungaro Duarte, Marco Antonio [3] ; de Vasconcelos, Bruno Carvalho [1]
Total Authors: 6
[1] Univ Fed Ceara, Programa Posgrad Odontol, Fortaleza, Ceara - Brazil
[2] Assoc Brasileira Odontol, Taguatinga, DF - Brazil
[3] Univ Sao Paulo, Fac Odontol Bauru, Dept Dentist Endodontia & Mat Odontol, Sao Paulo - Brazil
[4] Fac Odontol Sao Leopoldo Mandic, Fortaleza, Ceara - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Applied Oral Science; v. 26, 2018.
Web of Science Citations: 3

Objective: To evaluate the amount of apically extruded debris, percentage of foraminal enlargement and apical foramen (AF) deformation that occurred during root canal preparation with different reciprocation systems: Reciproc, WaveOne (M-Wire), and ProDesign R (Shape Memory Technology Wire) at two different working lengths (WLs): 0.0 and 1.0 mm beyond the AF. Material and methods: The AF of 120 root canals in 60 mesial roots of mandibular molars were photographed with stereomicroscope and randomly assigned into four groups: manual, Reciproc (REC), WaveOne (WO), and ProDesign R (PDR); subsequently, they were further subdivided according to the WL (n=15). Teeth were instrumented, coupled to a dual collecting chamber, and then another photograph of each AF was captured. Extrusion was analysed by determining the weight of extruded debris. Each AF diameter was measured in pre- and post-instrumentation images to determine deformation, which was analysed, and afterwards the final format of AFs was classified (circular/oval/deformed). Results: We found no significant differences when analysing each system at different WLs. When considering each WL, REC and WO showed highest extrusion values (P<.05); for AF enlargement, differences were observed only for WO, when it was used beyond the AF; differences were observed among M-Wire groups beyond the AF (P<.05). AF deformation was observed in all groups; PDR showed the lowest AF deformation values at both WLs; M-Wire groups showed 50% strain beyond the AF. Conclusion: Authors concluded that beyond the apical limit, the alloy and taper are important aspects when considering extrusion and deformation. (AU)

FAPESP's process: 16/00245-1 - Evaluation of physicochemical properties of an experimental mineral trioxide aggregate based sealer, determination of its compatibility with new root canal obturating system, and assessement of quality and stability of fillings performed with it.
Grantee:Bruno Carvalho de Vasconcelos
Support type: Scholarships in Brazil - Post-Doctorate