hrvatski

Korozija nikal-titanijevih ortodontskih žičanih lukova u slini i oralnom probiotskom preparatu

The aim is to examine how the use of probiotic supplements affects corrosion stability of orthodontic archwires made of nickel-titanium alloy (NiTi). MATERIALS AND METHODS: Testing was conducted on NiTi archwires having dimensions 0.508x0.508 and length 2.5 cm. The archwires (composition Ni=50.4%, Ti=49.6%) were uncoated, nitrified and rhodium coated. Surface microgeometry was observed by using scanning electron microscope and surface roughness was measured by profilometer through variables: roughness average, maximum height and maximum roughness depth. Corrosion were examined by way of electrochemical method of cyclic polarisation. Rhodium coated alloy in saliva has significantly higher general corrosion that nitrified alloy and uncoated alloy, with large effect size (p=0.027 ; η2=0.700). In the presence of probiotics, the result was even more pronounced (p<0.001 ; η2=0.936). Probiotic supplement increases general and localised corrosion of rhodium coated archwire, , and slightly decreases general and increases localised corrosion in uncoated , while in the case of nitrified archwire the probability of corrosion is very low. Differences in surface roughness between NiTi wires before corrosion are not significant. Exposure to the saliva decreases roughness average in rhodium coated wire (p=0.015 ; η2=0.501). Media do not significantly influence surface microgeometry in nitrified and uncoated wires. Probiotic supplement affects corrosion depending on the type of coating of the NiTi archwire. It increases general corrosion of rhodium coated wire and causes localised corrosion of uncoated and rhodium coated archwire. Probiotic supplement doesn't have major influence on surface roughness above the influence of saliva.

ortodontske žice ; korozija ; probiotici ; legure ; površinska svojstva

nije evidentirano

engleski

Corrosion of nickel-titanium orthodontic archwires in saliva and oral probiotic supplements

The aim is to examine how the use of probiotic supplements affects corrosion stability of orthodontic archwires made of nickel-titanium alloy (NiTi). MATERIALS AND METHODS: Testing was conducted on NiTi archwires having dimensions 0.508x0.508 and length 2.5 cm. The archwires (composition Ni=50.4%, Ti=49.6%) were uncoated, nitrified and rhodium coated. Surface microgeometry was observed by using scanning electron microscope and surface roughness was measured by profilometer through variables: roughness average, maximum height and maximum roughness depth. Corrosion were examined by way of electrochemical method of cyclic polarisation. Rhodium coated alloy in saliva has significantly higher general corrosion that nitrified alloy and uncoated alloy, with large effect size (p=0.027 ; η2=0.700). In the presence of probiotics, the result was even more pronounced (p<0.001 ; η2=0.936). Probiotic supplement increases general and localised corrosion of rhodium coated archwire, , and slightly decreases general and increases localised corrosion in uncoated , while in the case of nitrified archwire the probability of corrosion is very low. Differences in surface roughness between NiTi wires before corrosion are not significant. Exposure to the saliva decreases roughness average in rhodium coated wire (p=0.015 ; η2=0.501). Media do not significantly influence surface microgeometry in nitrified and uncoated wires. Probiotic supplement affects corrosion depending on the type of coating of the NiTi archwire. It increases general corrosion of rhodium coated wire and causes localised corrosion of uncoated and rhodium coated archwire. Probiotic supplement doesn't have major influence on surface roughness above the influence of saliva.

orthodontic wires ; corrosion ; probiotics ; alloys ; surface properties

nije evidentirano