Corrosive properties of fluoride-containing odontologic gels against titanium.
OBJECTIVE
The purpose of this study is to determine, on a quantitative basis, the kinetics of ionization of pure and alloyed titanium in various electrolytic media including commercial dental gels containing fluoride ions (Fluogel).


METHODS
The experimental method is a linear sweep voltammetric analysis, making use of a rotating disc electrode. Several successive analyses of different titanium samples are carried out, particularly as a function of the nature of the electrolytic solutions. The current corrosion I(cor) is measured by the determination of linear polarization resistance Rp.


RESULTS
Rp and I(cor) measurements by the voltammetric and analysis confirm the excellent resistance of titanium in physiological solutions; they also show that a fluoride-containing dental gel, which is a fluoridated and acidic preparation, is significantly harmful with respect to the corrosion process of titanium.


CONCLUSIONS
The results of this study must draw our attention towards the use of prophylactic gels in which pH is acidic. Indeed titanium suffers an important corrosion process in fluoridated acidic media. Recommendations for the prescription and for the optimized composition of the dental gels could be derived.
Toumelin-Chemla
F
F
Laboratoire de Biomatériaux, Faculté de Chirurgie Dentaire, l'Université Paris V, France.
Rouelle
F
F
Burdairon
G
G
D000143:Acids; D000497:Alloys / Q000737:chemistry; D064751:Ammonium Compounds; D003343:Corrosion; D004553:Electric Conductivity; D017097:Electric Impedance; D004563:Electrochemistry; D004566:Electrodes; D004572:Electrolysis; D005459:Fluorides / Q000737:chemistry; D005460:Fluorides, Topical / Q000737:chemistry*; D005782:Gels; D006863:Hydrogen-Ion Concentration; D007552:Isotonic Solutions / Q000737:chemistry; D007700:Kinetics; D000644:Quaternary Ammonium Compounds; D000077331:Ringer's Solution; D012399:Rotation; D012969:Sodium Fluoride / Q000737:chemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D000143:Acids; D000497:Alloys; D064751:Ammonium Compounds; D005460:Fluorides, Topical; D005782:Gels; D007552:Isotonic Solutions; D000644:Quaternary Ammonium Compounds; C031462:titanium alloy (TiAl6V4); C024822:ammonium fluoride; D000077331:Ringer's Solution; D012969:Sodium Fluoride; D014025:Titanium; D005459:Fluorides