Electrochemical dissolution of nickel‐titanium instrument fragments in root canals of extracted human maxillary molars using a small reservoir of electrolyte

Abstract

Amaral CCF, Ormiga F, Ara ujo OMO, Lopes RT, Gomes JACP. Electrochemical dissolution of nickeltitanium instrument fragments in root canals of extracted human maxillary molars using a small reservoir of electrolyte.

Ionic concentration in periradicular medium after dissolution of endodontic file fragments: an in vitro study

“…According to Amaral et al's study, this time is close to what could be considered clinically acceptable and a good starting point to bypass the fragment. 8 The results presented here showed mean Flconcentrations of 52.76, 98.13 and 48.31 mg/kg in groups 1, 2 and 3, respectively. These values are lower than those in a range from 12.3 to 22.6 g/L, which have been largely applied in dentistry to inhibit dental structure demineralization.…”

“…In the diffusion tests of the present study, the root canal was filled with 0.02 mL of the test solution, which was maintained in the root canal for two hours. This time was used according to Amaral et al, 8 who observed a significant reduction in the NiTi instrument fragment volume as a consequence of the electrochemical dissolution process in root canals of extracted human maxillary molars using the solution restricted to a small reservoir. According to Amaral et al's study, this time is close to what could be considered clinically acceptable and a good starting point to bypass the fragment.…”

“…In addition, only partial dissolution of the fragments was achieved in the studies where the dissolution method was applied. [5][6][7][8][9] According to the values observed in group 3, the dissolution of half of the fragment generates Ni ion concentrations lower than the range where cellular function impairment and cell proliferation inhibition occur, 10,13 even if no irrigation is performed during dissolution.…”

“…4 The partial dissolution of nickel-titanium (NiTi) and stainless steel instrument fragments has been accomplished in simulated root canals and in root canals of extracted human teeth after electrochemically induced dissolution in NaF-and NaCl-containing solutions for different periods of time. [5][6][7][8] This technical procedure allows the reestablishment of the canal path with manual path files. 5,6,8,9 Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”

“…[5][6][7][8] This technical procedure allows the reestablishment of the canal path with manual path files. 5,6,8,9 Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”