title: Scanning electronic microscopy analysis of the apical surface after of root-end resection with different methods.
abstract: To compare the time dispensed and the surface characteristics when a root-end resection was performed with a surgical ultrasonic device (VarioSurg, NSK, Japan) or with a Zekrya bur. Forty distal roots of freshly extracted mandibular molars were selected and divided into four different groups: (G1) stainless steel insert with ultrasound; (G2) diamond insert with ultrasound; (G3) stainless steel and diamond inserts with ultrasound, and (G4) Zekrya burs. The time required for the root-end resection was timed and the surface characteristics were evaluated via scanning electronic microscopy. The median times for the root-end resections were: 115.9 s for G1, 249.8 s for G2, 112.7 s for G3, and 7.44 s for G4, the latter presented a smoother root-end surface. There was no statistically significant difference in the comparisons between G3 group and G4 group (Zekrya burs). The other groups where the root-end resections were with ultrasonic devices proportioned a prolonged time to resection with irregular surfaces.
authors: Department of Dentistry, Endodontics and Dentistry Material, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil; Brazilian Dental Association, Taguatinga, Federal District, Brazil.
authors: Ricardo Affonso
authors: RA
authors: Bernardes
authors: Marco Antonio
authors: MA
authors: Húngaro Duarte
authors: Rodrigo Ricci
authors: RR
authors: Vivan
authors: Jarcio V
authors: JV
authors: Baldi
authors: Bruno C
authors: BC
authors: Vasconcelos
authors: Clóvis Monteiro
authors: CM
authors: Bramante
mesh_terms: D001047:Apicoectomy / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D008963:Molar / Q000000981:diagnostic imaging / Q000601:surgery; D013499:Surface Properties; D013995:Time; D019227:Tooth Apex / Q000000981:diagnostic imaging* / Q000601:surgery*; D014463:Ultrasonography
keywords: Zekrya bur; root-end resection; ultrasound