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.