Autor(es): Frota, Myrna Maria Arcanjo ; Bernardes, Ricardo Affonso ; Vivan, Rodrigo Ricci ; Vivacqua-Gomes, Nilton ; Duarte, Marco Antonio Hungaro ; Vasconcelos, Bruno Carvalho de
Data: 2019
Origem: Oasisbr
Assunto(s): Endodontia; Endodontics; Titânio; Cavidade Pulpar; Dental Pulp Cavity
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.
