Dissolution of Nickel-Titanium Endodontic Files via an Electrochemical Process: A New Concept for Future Retrieval of Fractured Files in Root Canals

Ormiga, Fabíola; Gomes, José Antônio da Cunha Ponciano; Araújo, Marcos César Pimenta de

doi:10.1016/j.joen.2009.11.024

Cited by 26 publications

(80 citation statements)

References 35 publications

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“…A recent study proposed the electrochemical-induced dissolution of the fractured instrument as a means to recover the original canal path without damaging the root structures (28). According to the method described by Ormiga et al (28), two electrodes must be immersed in the electrolyte, one acting as a cathode and the other as an anode.…”

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confidence: 99%

“…According to the method described by Ormiga et al (28), two electrodes must be immersed in the electrolyte, one acting as a cathode and the other as an anode. Contact between the fractured file and the electrode used as an anode is necessary when the dissolution of the fractured file is the objective of the process.…”

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confidence: 99%

“…Ormiga et al (28) observed a progressive consumption of K3 NiTi endodontic files with increasing polarization time in a sodium fluoride solution. Consequently, it was concluded that the concept of fractured file retrieval by an electrochemical process is feasible.…”

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confidence: 99%

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An Initial Investigation of the Electrochemical Dissolution of Fragments of Nickel-Titanium Endodontic Files

Ormiga

Gomes

Araújo

et al. 2011

Journal of Endodontics

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Introduction: A recent study presented the concept of an electrochemical-induced dissolution technique of fractured instruments. The purpose of this study was to test the ability to dissolve embedded fragments of K3 nickel-titanium (NiTi) files. The surface of the fragment exposed to the electrolytic solution was the main parameter evaluated as an interfering factor on the dissolution process. Methods: Three types of K3 NiTi 30.06 file fragments were produced, resulting in different exposed cross-section areas. Anodic current was recorded and used as a reference to evaluate the dissolution process of the fragments. Analysis of variance (P < .05) was used to compare the total electrical charge obtained from current versus time records among the fragments of the 3 groups. Radiographic analysis was carried out before and after the tests to observe the extension of dissolution achieved. Results: The total electrical charge values generated during the tests evidence a statistical difference among the 3 groups of fragments (analysis of variance, P < .05). The larger is the diameter of the exposed surface cross section, the higher is the total value of electrical charge. The radiographic images obtained before and after the tests showed a significant reduction of the fragment length as a result of the polarization imposed. Conclusions: The results presented here showed that it is possible to obtain a significant dissolution of K3 NiTi endodontic instrument fragments. The diameter of the surface of fragment exposed to the medium affects the current levels used to promote the dissolution. (J Endod 2011;37:526-530)

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An Initial Investigation of the Electrochemical Dissolution of Fragments of Nickel-Titanium Endodontic Files

Ormiga

Gomes

Araújo

et al. 2011

Journal of Endodontics

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“…Further studies are needed to investigate these phenomena in more detail. Ormiga et al (2010) reported the retrieval of fractured instruments from curve canals is possible without obtaining a straight-line access to the fragment. The results presented here indicated that was essential to prepare a staging platform in the four groups, causing wear in the inner walls of the simulated canals.…”

Section: Discussionmentioning

confidence: 99%

“…In this context, a less complex retrieval method that causes minimum damage to dental structure is necessary and the dissolution of a fractured instrument might represent an actual possibility to solve this problem. This dissolution of fractures files would enable the recovery of the original canal path without damaging the root structure (Ormiga et al, 2010). The difficulty in removing fragments and adverse prognostic of this procedural complication is a reason to consider further innovation.…”

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Retrieval of Fractured Files Based on Electrochemical Dissolution

Dufeu¹,

Peña-Farfal²,

Muñoz³

2013

Int. J. Odontostomat.

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ABSTRACT:The purpose of this study was to investigate whether the Electrochemical Dissolution (DE) facilitates the retrieval of fractured files, from Endo-Training block with an artificial root canal, by using ultrasonic techniques (US). Twenty Endo-Training block with an artificial single canal with working length 16 mm and twenty nickel-titanium (NiTi) Protaper Universal rotary files were used. 10 Shaping S1 files and 10 Shaping S2 files, were sectioned transversally within the conduit, to 5mm of the apical tip. Twenty samples were divided into four groups: Group1 and 3 received the action of DE and US, and groups 2 and 4 received the action of US. To remove the fragments we used Staging Platform and Dental Microscope. Outcome was analyzed statistically by Student t test. Statistical Analysis showed a significant difference in retrieval time of the fragments and weight loss mass of Endo training block ultrasonic tips were used, between groups that applied Ultrasonic with electrochemical dissolution and the group using only ultrasonic. It can be concluded that there was weight loss mass of separated fragment by electrochemical action, however, it was not sufficient and its use alone was inconclusive to retrieve the fragments. The procedure needs to be complemented with the use of the staging platform, ultrasonic tips and Dental Microscope.

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Finding Needles in a Haystack—Quiz Case

Jurewitz¹,

Amsterdam²

2013

JAMA Intern Med

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During root canal preparation procedures, the potential for instrument breakage is always present. This review focuses on basic principles involved in separated instrument retrieval, factors on which successful retrieval of the separated instrument depends on and various treatment options available for the same. A decision-making fl owchart for the techniques to be used in the management of intracanal separated instruments is presented. Prognostic factors depending on the phase (that of chemo-mechanical preparation) of separation and pre-operative status of pulp are discussed. Few case reports that document cases with instrument separation that were successfully treated in our department are also presented.

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Dissolution of Nickel-Titanium Endodontic Files via an Electrochemical Process: A New Concept for Future Retrieval of Fractured Files in Root Canals

Cited by 26 publications

References 35 publications

An Initial Investigation of the Electrochemical Dissolution of Fragments of Nickel-Titanium Endodontic Files

An Initial Investigation of the Electrochemical Dissolution of Fragments of Nickel-Titanium Endodontic Files

Retrieval of Fractured Files Based on Electrochemical Dissolution

Finding Needles in a Haystack—Quiz Case

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