XIX National Congress
and VI International of the Spanish Society of Conservative Dentistry
17-19, May 2012
Santiago de Compostela, Spain
Meeting Abstract
Sponsors: Sociedad Española de Odontología Conservadora (SEOC)
- Oral Presentation 15
TITLE: Dissolution of endodontic files via an
electrochemical process.
AUTHORS
García
Rielo, Manuel Miguel 1
Fernández
Alonso, Pablo1
Buceta
Fernández, David2
Rivas Mundiña, Berta1
Martin
Biedma, Benjamín1
1.- Unidad
de Patología y Terapéutica Dental II. Universidad de Santiago de Compostela
2.-
Laboratorio de Magnetismo y Nanotecnología (Nanomag).
Universidad de Santiago de Compostela
SOURCE: Med
Oral Patol Oral Cir Bucal. 2012 August
1;17(Supplement2):S15.
* doi:10.4317/medoral.17643799
http://dx.doi.org/10.4317/medoral.17643799
ABSTRACT
INTRODUCTION The aim of this study is to introduce a
new concept of retrieval of fractured instruments from root canals based on an
electrochemical process. METHODS Eighteen rotary fragments files were produced
(WaveOneTM primary) divided into three groups
according to their length (5, 10 and 17 mm); a 3-electrode electrochemical cell
was used that contained a saturated calomel electrode as reference, platinum as
counter electrode and each of the fragments as the working electrode. The
solution was composed by NaF and NaCl.
A constant anodic potential was applied for one hour, connected to an AutoLab Potentiostat controlled
by a computer. Before and after each test fragments are weighed with a
precision microbalance (Mettler Toledo). Statistical analysis with nonparametric test were performed. RESULTS
There is a dissolution of the fragments files causing a statistically
significant weight loss (Wilcoxon positive) with 85%
of weight loss in the 5 mm. group, 71% in the 10 mm. group and 36% in the 17
mm. group. We found that a greater difference in weight loss obtained is
observed a maximum current potential reached, indicating a good correlation
(Pearson Coefficient 0.85) showing greater dissolution of the fragments.
CONCLUSIONS The results presented here showed that it
is possible to obtain a significant dissolution of endodontic instrument
fragments by an electrochemical process; this concept is the basis for the
development of a effective method to remove fractured instruments from root
canals.
KEYWORDS
Endodontic instrument, fracture, micro-electrodes, nickel-titanium,
retrieval of fractured instrument, active dissolution.