Evaluation of surface roughness of the bracket slot before and after burning

Raudhatul Jannah; Bergman Thahar; Endah Mardiati; Ida Ayu Evangelina

doi:10.22146/majkedgiind.28387

Evaluation of surface roughness of the bracket slot before and after burning

https://doi.org/10.22146/majkedgiind.28387

Raudhatul Jannah^(1*), Bergman Thahar⁽²⁾, Endah Mardiati⁽³⁾, Ida Ayu Evangelina⁽⁴⁾

(1) Orthodontic Specialis Study Program, Faculty of Dentistry, Universitas Padjajaran, Bandung, West Java
(2) Department of Orthodontics, Faculty of Dentistry, Universitas Padjajaran, Bandung, West Java
(3) Department of Orthodontics, Faculty of Dentistry, Universitas Padjajaran, Bandung, West Java
(4) Department of Orthodontics, Faculty of Dentistry, Universitas Padjajaran, Bandung, West Java
(*) Corresponding Author

Abstract

Slot bracket base is one important element to enable sliding movement of the archwire. Bracket reconditioning by means of burning changes the surface roughness of slot bracket base. The heat above 450 °C shows microstructure changes of the slot surface. On this basis, the present study aims to evaluate surface roughness changes of the slot bracket base before and after reconditioning by means of burning. Sixteen premolar brackets standard edgewise were divided into two groups each consisting of eight brackets. These two groups were tested at three different points using Scanning Electron Microscopy (SEM), with 3000 times of magnification. Subsequentl,group A was burned for 5 seconds (approximately 450 °C) and group B was burned for 10 seconds(approximately 643 °C). After treatment,these two groups were tested for the second time using Scanning Electron Microscopy (SEM), with 3000 times magnification and the images were analyzed using a discrete scale quantitative classification. Afterwards, the data were analyzed using ANOVA (p≤0.05) and post hoc analysis. The result showed that surface roughness of the slot bracket base burned for 10 seconds experienced more significant change than that of bracket burned for 5 seconds and that of the control bracket(p≤0.05).Bracket reconditioning using burning either for 5 to 10 seconds change the surface roughness of the slot bracket base.

Keywords

Scanning Electron Microscopy (SEM); slot bracket base; surface roughness

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References

1. Sfondrini MF, Xheka E, Scribante A, Gandini P, Sfonrini G. Reconditioning of self ligating brackets: a shear bond strength study. The Angle Orthod J. 2012; 82(1): 158–164. doi: 10.2319/033011-227.1.

2. House K, Sernetz F, Dymock D, Sandy JR, Ireland AJ. Corrosion of orthodontic ap- pliances, should we care?. Am J Orthod and Dentofac Orthopaedics. 2008; 133(4): 584–592. doi: 10.1016/j.ajodo.2007.03.021.

3. Lunardi N, Gamairo GH, Magnani M, Nouer D, Siqueira V, Consani S, Neto J. The effect of repeated bracket recycling on the shear bond strength of different orthodontic adhesives. Braz J Oral Sci. 2008; 27(7): 1648–1652.

4. Buchman DL. Effects of recycling on metallic direct-bond orthodontic brakets. Am J Or- thod.1980; 77: 654–668.

5. Dolci GS, Spohr AM, Zimer ER, Marchioro EM. Assessment of the dimension and surface characteristics of orthodontic wires and bracket slot. Dental Press J Ort. 2013; 2(18): 69–74.

6. Kumar S, Shetty VS, Mogra S. Effect of different reconditioning methods on slot dimensions, bracket base thickness and base surface area on stainless steel brackets: an in vitro study. The Journal of Indian Orthodontic Society. 2014; 48(4): 393–400.

7. Bringas JE. Handbook of Steel Data: American and European. ASTM International; 2015. 15–23.

8. Hibbeler RC. Mechanics of Materials. 8th ed. Pearson; 2011. 151.

9. Proffit WR, Fields HW, Sarver DM. Contem-porary Orthodontics. 5th ed. Elsevier. St. Louis; 2013. 328–332.

10. Sfondrini MF, Cacciafesta V, Maffia E, Massironi, Scribante A, Alberti G, Biesuz R, Klersy C. Chromium release from new stainless steel, recycled and nikel free orthodontics brakets. Angle Orthod J. 2009; 79(2): 361–367.

11. Van NR. Introduction to Dental Material. 4th ed. Mosby Elsevier; 2014. 73–74.

12. Iluru R, Nellore C, Kamati PK, Thalapaneni, Myla VB, Ramyasree K, Prasad M. The effects of in-office reconditioning on the slot dimensions and static frictional resistance of stainless steel brakets. Journal of Clinical & Diagnostic Research. 2016; 10(1); ZC74-ZC78. doi: 10.7860/jcdr/2016/15645.7154.

13. Matsuoka Y, Iwasaki T, Nakada N, Tsuchiyama T, Takaki S. Effect of grain size on thermal and mechanical stability of austenite in metastable austenitic stainless steel. ISIJ International. 2013; 53(7): 1224–1230.

14. McGuire MF. ASM International: Stainless Steel for Design Engineers; 2008. 69–71.

15. Gupta N, Kumar D, Palla A. Evaluation of the effect of three innovative recyling methods on the shear bond strength of stainless steel brackets-an in vitro study. 2017; 9(4): e550-e555. doi: 10.4317/jced.53586.

16. Pompeo DD, Rosario HD, Lopes BM, Cesar PF, Paranhos LR. Can 10% hydrofluoric acid be used for reconditioning of orthodontic bracket?. Indian J Dent Res. 2016; 27(4): 283–387. doi: 10.4103/0970-9290.191886.

DOI: https://doi.org/10.22146/majkedgiind.28387