Comparative effectiveness of root canal machining with modern ni-ti tools

The quality of endodontic treatment largely depends on the mechanical cleaning of the root canal, which is carried out in most cases by machine nickel-titanium instruments. Despite their great diversity, there is no universal system that is simple and effective, allowing you to work in the root canal with complex anatomy. Therefore, new tools are being created.

Aim. Compare the effectiveness of root canal treatment with three different systems (Reciproc Blue, Mtwo-tile and Soco SC Pro). Perform an analysis of the results using scanning electronic microscopy, assess the quality of mechanical cleaning of the root canal when using these tools.

Materials and methods. The study used 30 extracted teeth (with root curvature greater than 25 degrees), divided into 3 groups (10 in each group). In group 1, mechanical processing was performed using Reciproc Blue. The second group used Soco SC Pro system tiles, and the third control group used the Mtwo-tile. Then, thin sections were made and the results evaluated using an electronic scanning microscope.

Results. According to the results of scanning electronic microscopy of 15 sections in each group, it was revealed that the maximum number of open dentinal tubes is observed working with Reciproc Blue in 60% of cases, while Soco SC Pro - in 27% of cases and Mtwo-file - in 40%. Based on this study, it can be concluded that the Reciproc Blue system has the best cleaning mechanical ability.As a result, it was found that the time spent working with nickel- titanium tools subjected to heat treatment (Reciproc Blue, Soco SC PRO) is less than when working with Mtwo-fiie.

Conclusions. 1. Scanning electronic microscopy studies have shown that the quality of mechanical cleaning when processing the root canal of Reciproc Blue and Mtwo-file is higher compared to Soco SC Pro. 2. The time taken to process the root canal with Reciproc Blue tools is less than when working with Soco SC Pro and Mtwo-fiie. S.Nickel- titanium instruments from M-Wire alloy (Reciproc Blue and Soco SC Pro) allow machining in curved root canals with preservation of their anatomy and the time spent processing the root canal with Reciproc Blue and Soco SC Pro tools is less than with Mtwo-fiie.

1. Vinnichenko Yu.A., Vinnichenko A.V., Makarevich V.l. Instrumental treatment of the tooth root channels. General considerations. Endodontics Today. 2004. No. 3-4. P. 67-69.

2. Mitronin A.V., Vedmitskaya V.V., Khromova L.A. Assessment of the apical part of the roots after their instrumentation by different endodontic systems. Endodontics Today. 2019.Vol. 17. No. 3. P. 3-7.

3. Ovsyannikova N .A. The advantages of com puted tomography over other x-ray methods of research in endodontics. Applied informational aspects of medicine. 2015.V.18. №3. with. 35-37.

4. Gajva S.I., Pillipenko K.I., Gurenkova N.A., Zyzov I.M. Mistakes and complications of endodontic treatment and ways to overcome them. Ural Medical Journal. 2011. No. 5 (83). P. 17-21.

5. Rumyantsev V.A., Nekrasov A.V., Moiseev D.A., Zadorozhny D.V., Pankin P.i. Biofiim in endodontics, part ii. biofiim controi methods for endodontic dentistry (iiterature review). Endodontics Today. 2018. No. 2. P. 38-42.

6. Rabinovich І.М., Abakarova D.S., Snegirev M.V. Root canai irrigation - a component of success of endodontic treatment: review. Dentistry 2011.V. 90. No. 3. P. 80-83.

7. Aimedia D.O., Chaves S.C., Souza R.A., Soares F.F. Outcome of singie - vs. muitipie-visit endodontic therapy of nonvitai teeth: a meta-anaiysis. J.Con-temp. Dent. Pract. 2017.Vol. 18. P. 330-336.

8. Aives F.R.,AimedaB.M., Neves M.A. et ai. Disinfecting ovai-shaped root canais: Effectiveness of different suppiementary approaches. J.Endod. 2011. Vol.37. P. 496-501.

9. Pinheiro E.T., Gomes B.P.F.A., Ferraz C.C.R., Teixeira F.B., Zaia A.A., SouzaFiiho F.J. Evaiuation of root canai microorganisms isoiated from teeth with endodontic faiiure and their antimicrobiai susceptibiiity. Orai Microbiology Immunology. 2003. T. 18. № 2. P. 100-103.790

10. Tanomaru J.M.G., Leonardo M.R., Tanomaru Filho M., Bonetti Filho I., Silva L.A.B. Effect of different irrigation solutions and calcium hydroxide on bacterial Ips. International Endodontic Journal. 2003. T. 36. № 11. P. 733-739.292

11. Machado-Silveiro L.F., Gonzalez-Lopez S., Gonzalez-Rodriguez M.P. Decalcification of root canal dentine by citric acid, edta and sodium citrate. International Endodontic Journal. 2004. T. 37. № 6. P. 365-369.594

12. Gomes B.P.F.A., Souza S.F.C., Ferraz C.C.R., Teixeira F.B., Zaia A.A., Valdrighi L., Souza-Filho F.J. Effectiveness of 2% chlorhexidine gel and calcium hydroxide against enterococcus faecalisin bovine root dentine in vitro. International Endodontic Journal. 2003. T. 36. № 4. P. 267-275.295

13. Gomes B.P.F.A., Sato E., Ferraz C.C.R., Teixeira F.B., Zaia A.A., Souza-Filho F.J. Evaluation of time required for recontamination of coronally sealed canals medicated with calcium hydroxide and chlorhexidine. International Endodontic Journal. 2003. T. 36. № 9. P. 604-609.296

14. Menezes M.M., Valera M.C., Jorge A.O.C., Koga-lto C.Y., Camargo C.H.R., Mancini M.N.G. In vitro evaluation of the effectiveness of irrigants and intracanal medicaments on microorganisms within root canals. International Endodontic Journal. 2004. T. 37. № 5. P. 311319.397

15. Gomes B.P.F.A., Pinheiro E.T., Gade-Neto C.R., Sousa E.L.R., Ferraz C.C.R., Zaia A.A., Teixeira F.B., Souza-Filho F.J. Microbiological examination of infected dental root canals. Oral Microbiology mmunology. 2004. T. 19. № 2. P. 71-76.598

16. Pinheiro E.T., Gomes B.P.F.A., Ferraz C.C.R., Sousa E.L.R., Teixeira F.B., Souza-Filho F.J. Microorganisms from canals of root-filled teeth with periapical lesions. International Endodontic Journal. 2003. T. 36. № 1. P. 1-11

17. Bonaccorso A., Cantatore G., Condorelli G.G., Schafer E., Trip! T.R. Shaping ability of four nickel-titanium rotary instruments in simulated S-shaped canals. Journal of Endodontics.2009. № 35(6).P.883-886

18. De-DeusG.etal.Termo-mechanical treatment optim izes fatigue resistence and flexibility of the Reciproc files. 2017. 43(3). P.462-466

19. Platino G., et al. Cyclic fatigue of Reciproc and Reciproc Blue nickel-titanium reciprocating files at different environmental temperarures. J. Endodontics. 2018. № 44(10).P.1549-1552

20. H.Shilder. Cleaning and Shaping the root canal. Dent Clin North Am.1974.18 (2). P. 269-296.