Korozija nikal-titanijevih ortodontskih icanih lukova u slini i oralnom probiotskom preparatu/Corrosion of Nickel-Titanium Orthodontic Archwires in Saliva and Oral Probiotic Supplements

• Published in: Acta stomatologica croatica Vol. 51; no. 4; p. 316
• Main Authors: Trolic, Ines Musa, Turco, Gianluca, Contardo, Luca, Serdarevic, Nikolina Leona, Curkovic, Helena Otmacic, palj, Stjepan
• Format: Journal Article
• Language: English
• Published: Sveuciliste U Zagrebu 01-12-2017
• Subjects: Analysis; Chemical properties; Corrosion (Chemistry); Orthodontic appliances; Croatia
• ISSN: 0001-7019
• DOI: 10.15644/aSc51/4/6

Cilj: Ispitati kako uporaba probiotskih preparata utjece na korozijsku stabilnost ortodontskih žicanih lukova nikal-titanijeve legure (NiTi). Materijal i metode: Testirani su NiTi lukovi dimenzija 0,508 X 0,508 mm i duljine 2,5 cm, te (sastav Ni = 50,4 %; Ti = 49,6 %) neobložene, nitrirane i rodirane površine. Površinska mikrogeometrija istraživana je skenirajucim elektronskim mikroskopom pri povecanju od 1000 puta, a površinska hrapavost mjerena je profilometrom te izražena u sljedecim vrijednostima: prosjecna hrapavost, maksimalna visina i maksimalna dubina hrapavosti. Vrsta i dinamika korozije ispitani su elektrokemijskom metodom ciklicke polarizacije. Rezultati: Legura rodirane površine u slini ima znacajno vecu opcu koroziju od nitirirane i neobložene, uz veliku snagu efekta (p = 0,027; ?2 = 0,700). Probiotski preparat povecava opcu i lokaliziranu koroziju rodirane žice i malo smanjuje opcu, te povecava lokaliziranu koroziju neobložene žice, a u slucaju nitrirane žice vrlo je mala mogucnost od pojave korozije. Razlike u površinskoj hrapavosti izmedu nikal-titanijevih žica prije korozije nisu znacajne. Izloženost umjetnoj slini smanjuje prosjecnu hrapavost rodiranih žica (p = 0,015; ?2 = 0,501). Medij ne utjece znatno na površinsku mikrogeometriju nitriranih i neobloženih žica. Zakljucak: Probiotski preparat utjece na opcu i lokaliziranu koroziju, ovisno o vrsti nikal-titanijeve obloge. Povecava opcu koroziju rodirane žice te uzrokuje pojavu lokalizirane korozije neobložene i rodirane žice. Probiotski preparat nema znacajan utjecaj na površinsku hrapavost, osim utjecaja same sline. Zaprimljen: 19. rujna 2017. Prihvacen: 6. studeni 2017. Adresa za dopisivanje Ines Musa Trolic Sveucilište u Zagrebu Stomatološki fakultet Gunduliceva 5, Zagreb [e-mail] Kljucne rijeci ortodontske žice, korozija, probiotici; legure; površinska svojstva Objectives: The aim of the study was to examine how probiotic supplements affect the corrosion stability of orthodontic archwires made of nickel-titanium alloy (NiTi). Materials and Methods: NiTi archwires (0.508x0.508 and having the length of 2.5 cm) were tested. 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 these variables: roughness average, maximum height and maximum roughness depth. Corrosion was examined by electrochemical method of cyclic polarisation. Results: Rhodium coated alloy in saliva has significantly higher general corrosion in saliva than nitrified alloy and uncoated alloy, with large effect size (p=0.027; [eta]2=0.700). In the presence of probiotics, the result was even more pronounced (p<0.001; [eta]2=0.936). Probiotic supplement increases general and localised corrosion of rhodium coated archwire and slightly decreases general corrosion and increases localised corrosion in uncoated archwire , while in the case of nitrified archwire the probability of corrosion is very low. The differences in surface roughness between NiTi wires before corrosion are not significant. Exposure to saliva decreases roughness average in rhodium coated wire (p=0.015; [eta]2=0.501). Media do not significantly influence surface microgeometry in nitrified and uncoated wires. Conclusion: 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 does not have greater influence on surface roughness compared to that of saliva. Received: September 19, 2017 Accepted: November 6, 2017 Address for correspondence Ines Musa Trolic University of Zagreb School of Dental Medicine [e-mail] Key words Orthodontic Wires; Corrosion, Probiotics; Alloys; Surface Properties