Dental archwires are exposed to tribocorrosion processes during their use. The simultaneous processes of chemical and mechanical wear can lead to serious medical issues. Two dental alloys in the form of archwires, namely staineless steel AISI 304 and NiTi alloy will be studied in as-received state. Electrochemical methods (potentiodynamic measurements, electrochemical impedance spectroscopy) will be used to define electrochemical properties of the two different dental alloys in simulated saliva. Also, the influence of different oral cavity environments will be studied and its tendency to localized corrosion will be examined. Tribocorrosion processes will be studied by the use of different electrochemical techniques on reciprocating movement tribometer (potential response, current response at open circuit condition and electrochemical noise). Wear rate and the type of wear mechanism will be estimated. Spectroscopic study that will include wear track analysis by SEM/EDS and X-ray photoelectron spectroscopy will be included in the analysis after the wear. Besides that, the analysis of the dissolved ions during mechanical wear will be followed and evaluated. The aim of the research is to gain the information of the tribocorrosion process and to transfer the result to real environment to predict effect on patients and medical treatment efficiency.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 2241895NiTi alloys as important technological material finds its wide application in different fields. Due to shape memory and superelastic properties it is widely used in biomedical applications. Generally, nickel titanium alloys are known for their good corrosion resistance, but in some circumstances they suffer from different forms of corrosion, like pitting and crevice. Beside corrosion, the wear resistance of this alloy is of critical concern in many applications. Since NiTi dental archwires experience severe failures in applications or reduced performance , it is of great importance to study the causes for such performance or failures. The aim of this paper is to analyse the influence of the nature of the orthodontic archwires on the friction coefficient and wear rate against Al2O3 and materials commonly used as brackets (316L Stainless Steel). The materials selected as orthodontic archwires will be stainless steel and NiTi archwire. Unused and already used dental archwire s with oral deposits will be examined in order todefine the effect of plaque presence on friction coefficient and the performance of the wire. The roughness and hardness will be defined before and after wear tests. Wear tests will be carried out in an artificial saliva. A relationship between the hardness of the materials and the friction coefficients as well as the effect of material and different surface conditions of the dental archwire will be studied in order to correlate and understand different properties of dental archwires.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 2068583Organization of the second international Alpe Adria symposium.
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 282126336Editor of an international book about the use of fixed orthodontic appliances for treatment of different malocclusions. The use of several different techniques is presented along with various methods for the improvement of treatment effectiveness.
C.01 Editorial board of a foreign/international collection of papers/book
COBISS.SI-ID: 214417932