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 20

TITLE: Electrochemical studies with rotatory instruments.

AUTHORS

Fernández Alonso, Pablo¹

García Rielo, Manuel Miguel¹

Rivas Mundiña, Berta¹

Varela Patiño, Purificación¹

Martín Biedma, Benjamín¹

1.-Unidad de PTD II USC

SOURCE: Med Oral Patol Oral Cir Bucal. 2012 August 1;17(Supplement2):S20.

* doi:10.4317/medoral.17643804

http://dx.doi.org/10.4317/medoral.17643804

ABSTRACT

Development of two study models using cells electrochemical to realise analysis of corrosion and dissolution of rotatory instruments. Design of two models of electrochemical cell ; first for corrosion studies: rotatory instruments like work electrode are used, a gauce of Pt like counter electrode and Ag/AgCl like reference electrode; all immersed one in sodium hypochlorite and connected to a potenciostat (ACM) to register the originated measures of galvanic current. The second cell design is used it to electrochemical for dissolution studies: fragments of rotatory instruments like work electrode, vitreous carbon like counter electrode and Ag/AgCl like reference electrode; immersed in a solution of NaF and NaCl, connected to a potenciostat that applies a constant anodic potential, registering the obtained values. With the first design of cell is detected that in the rotatory instruments a galvanic couple between the active part, with an anodic behavior and the inactive part, cathodic. In the tip of the instrument, the speed of corrosion is greater. The main responsible in charge for de galvanic couples’s is the concentration gradient that settles down in the electrolyte. With the second cell design is observed dissolution of fragments files causing weight loss; the greater difference in weight loss obtained a maximum potential of reached current is observed. The obtained results show to us that these two models of study using cells electrochemical are effective to realise corrosion and dissolution analysis in rotatory instruments.

KEYWORDS

Corrosion, dissolution, electrochemical, rotatory instruments.