Determining the Corrosion Rates of Ni-Ti Instruments in Different Irrigants

Year 2011, Volume: 38 Issue: 1 - Volume: 38 Issue: 1, 23 - 28, 01.02.2011

Mehmet Can Göktaş Semra Bilgiç Dilek Dalat Demiryürek Ebru Özeser

Abstract

The purpose of this study, was to evaluate and compare the electrochemical corrosion rate of nickel-titanium rotary files when immersed in rrigation solutions. Ni-Ti rotary files ProTaper F 2 Rotary – Dentsply Maillefer, Ballaigues, Switzerland were immersed in 5.25% NaOCl,17% EDTA, 10% citric acid and MTAD irrigants and the corrosion rates were determined electrochemically by the Tafel extrapolation method. Data was obtained with a potentiostat, a voltage scan generator and a recorder. The irrigants were filled into a pyrex glass cell. Cutting flutes of files were immersed in the irrigating solutions and kept for 20 min in the cell prior to each experiment, so that the rest potential of the electrode could be attained. A Saturated calomel electrode was used as a reference and platinium plate was used as a counter electrode. In the experiments, currentpotential curves were obtained and statistical analysis of the data was performed by using the Kruskal-Wallis one-way. According to the results of this study, corrosion rates of Ni-Ti rotary files immersed in irrigation solutions were found 10% citric acid>5.25%NaOCl>17% EDTA>MTAD respectively

Keywords

Corrosion, Ni-Ti rotary intruments, EDTA, Citric acid, MTAD

Ni-Ti kanal farklı irrigasyon solüsyonlarında korozyon hızlarının değerlendirilmesi

Abstract

Araştırmamızın amacı, F2 , Ni-Ti döner kanal aletlerinin EDTA, sitrik asit ve MTAD irrigasyon solüsyonları ile temasında oluşan korozyon hızlarını elektrokimyasal olarak belirlemektir. Bu amaçla çalışmamızda %5.25 lik NaOCl, %17 lik EDTA, % 10 luk sitrik asit ve MTAD solüsyonları ile temasları sonucunda Ni-Ti döner kanal aletlerinin korozyon hızları değerlendirildi. Korozyon hızları elektokimyasal olarak Tafel ekstrapolasyon yöntemiyle belirlendi. İstatistiksel değerlendirme Kruskal-Wallis tek yönlü varyans analiziyle yapıldı. Araştırmanın sonuçlarına göre, çalışılan irrigasyon solüsyonları içinde Ni-Ti kanal aletlerinin korozyon hızları sırasıyla,%10 Sitrik asit>%5.25 NaOCl>%17 EDTA >MTAD olarak bulundu

Keywords

Ni-Ti döner kanal aletleri, EDTA, Sitrik asit, MTAD, Korozyon

References

• Walia H, Brantley WA, Gerstein H. An initial investigation of the bending and torsional properties of Nitinol root canal files. J Endod. 1988; 14: 346-51.
• Bryant ST, Thompson SA, Al-Omari MAO, Dummer PMH. Shaping ability of ProFile rotary nickel-titanium instruments with ISO sized tips in simulated root canals. Part l. Int Endod J 1998; 31; 275-81.
• Gambarini G. Cyclic fatigue of ProFile rotary instruments after prolonged clinical use. Int Endod J 2001; 34: 386-9.
• Deplazes P, Peters O, Barbakow F. Comparing apical preparation of root canals shaped intsruments and nickel- titanium hand instruments. J Endod 2001; 27: 196-202.
• Hulsmann M, Schade M, Schafers F. A comparative study of root canal preparation with Hero 642 and Quantec SC rotary instruments. Int Endod J 2001; 34: 538-46.
• Çalışkan K. Endodontide tanı ve teda- viler. Nobel tıp kitapevleri. 2006. 2. baskı. P. 284-85 .
• Zehnder M. Root canal irrigants. J Endod 2006; 32: 389-98.
• Mueller HJ. Corrosion determination techniques applied to endodontic instruments- irrigating solutions systems. J Endod 1982 1983: 8; 246-52.
• Alaçam T, Uzel İ, Alaçam A, Aydın M. Endodonti. 2.Baskı. Ankara. Türkiye.Barış Yayınları. 2000. s. 292.
• Torabinejad M, Khademi AA, Babagoli J, Cho Y, Johnson WB, Bozhilov K, Kim J, Shabahang S. A new solution for removal of the smear layer. J Endod 2003; 29:170-5
• Torabinejad M, Shabahang S, Aprecio RM, Kettering JD. The antimicrobial effect of MTAD: an in vitro investigation. J Endod 2003; 29: 400-3.
• Shabahang S, Torabinejad M. Effect of MTAD on enterococcus faecalis- contaminated root canals of extracted human teeth. J Endod 2003; 29: 576-9.
• Neal RG, Craig RG, Powers JM. Effects of sterilization and irrigants on the cutting ability of stainless steel files. J Endod 1983; 9: 93-6.
• Praisarnti C, Chang JW, Cheung GS. Electro polishing enhances the resistance of nickel-titanium rotary files to corrosion-failure in hypochlorite. J Endod 2010 36:1354-7.
• Fife D, Gambarini G, Brittto Lr L. Cyclic fatigue testing of ProTaper NiTi rotary instruments after clinical use. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2004; 97: 251-6.
• Wolcott J, Himel VT. Torsional properties of nickel-titanium versus stainless steel endodonic files. J Endod 1997; 23: 217-20.
• Machado Silveriro LF, Gonzalez Lopez S, Gonzalez Rodriguez MP. Decalcification of root canal dentine by Citric acid, EDTA and sodium citrate. Int Endod J 2004; 37: 365-69.
• Katayama H, Yamamato T, Kodama T. Degradation behavior of protective layer in chloride solutions. Corr Engineering 2000; 49: 41-4
• Reinhard G, Radtkem M, Rammelt U. The role of salts of weak acids in the chemical passivation of iron and steel in aqueous solutions. Corrosion Science 1992; 33: 307-13
• Skoog DAS, West DM, Holler FJ. Fundamentals of Analytic Chemistry. 6th ed. Philadelphia. Saunders.1992
• Calt S, Serper A. Time dependent effects of EDTA on dentin structure. J Endod 2002; 28: 17-9.
• Bonaccorso A, Tripi TR, Rondelli G, Condorelli GG, Cantatore G, Schafer E. Pitting corrosion resistance of Nickel-titanium rotary instruments with different surface treatments in seventeen percent ethtylenediamin tetraacetic acid and sodium hypochloride solutions. J Endod 2008; 34: 208-11.