Microscopic evaluation of the dentinal walls of extracted human teeth following electrochemical dissolution of fragmented nickel–titanium instruments. Issue 9 (11th June 2019)

• Record Type: Journal Article
• Authors: Kowalczuck, Alexandre; Borges, Murilo M.; Kruger, Helington; Piasecki, Lucila; da Silva Neto, Ulisses X.; Westphalen, Vânia P. D.; Laurindo, Carlos A. H.; Carneiro, Everdan
• Is Part Of: Microscopy research and technique. Volume 82:Issue 9(2019)
• Page Start: 1529
• Page End: 1534
• Publication Date: 2019-06-11
• Subjects: Electron microscopy -- Technique -- Periodicals; Microscopy -- Periodicals; Microscopy -- Technique -- Periodicals; 502.825
• DOI: 10.1002/jemt.23317
• Languages: English
• ISSNs: 1059-910X

Abstract

Abstract: Electrochemical dissolution is a method in which fluoridated solution in direct contact with the fractured instrument receives an electrical current that speeds up fragment dissolution. The aim of this study was to assess the integrity of dentinal walls during the electrochemical dissolution of fractured rotary endodontic instruments in extracted human teeth. Forty‐five human mandibular incisors subjected to the electrochemical dissolution process using fluoride solution with low NaCl concentration (LC group: NaF 12 g/L + NaCl 1 g/L, pH = 5.0), fluoride solution with saturating NaCl concentration (SC group: NaF 12 g/L + NaCl 180 g/L, pH = 5.0) and distilled water (control group) were evaluated. For each group, 15 incisors were submitted for the scanning electron microscopy (SEM) evaluation. The roots were sectioned longitudinally; each hemisection was analyzed ( n = 30), and energy‐dispersive spectroscopy (EDS) was performed. The amount of dentinal tubule openings was analyzed by SEM. Statistical analyses were performed. The test solutions did not alter the amount of dentinal tubule openings when compared with the control group. No Ni or Ti was impregnated into the dentinal tubules after electrochemical techniques. The dentinal structure remained unchanged following the electrochemical dissolution method. Abstract : Neither pH 5.0 fluoride solutions altered the amount of dentinal tubule openings. After electrochemical dissolution, no Ni or Ti was impregnated into dentinal tubules. The electrochemical dissolution did not alter dentinal structure.