Influence of different cleaning methods on the cutting efficiency and morphological characteristics of Carbide burs
Influência de diferentes métodos de limpeza sobre a eficiência de corte e as características morfológicas de fresas Carbide
Fais, Laiza Maria Grassi; Scardueli, Cássio Rocha; Bordignon, Daniela Cristina; Silva, Regina Helena Barbosa Tavares da; Guaglianoni, Dalton Geraldo; Pinelli, Lígia Antunes Pereira
Rev. odontol. UNESP, vol.40, n4, p.166-173, 2011
Abstract
Introduction: Currently, there are many questions regarding the cleaning methods seeking greater efficiency and less loss of burs. Aim: the aim of this study was to evaluate the influence of cleaning methods on the cutting efficiency and morphological characteristics of stainless steel burs tungsten carbide (carbide). Materials and method: Thirty burs were divided into five groups (n = 5) according with the cleaning method: L1- steel brush, L2- nylon brush, L3- ultrasound + distilled water, L4- ultrasound + descaling solution and L5- no cleaning method (control). The burs were used for the cutting of bovine enamel during six periods of 12 minutes each. After each period, the burs were cleaned (except L5) following the protocol established for each group. The cutting efficiency was determined by mass loss and morphological characteristics. Result: The average amount of wear after 72 minutes of use were L1 = 0.3558 g; L2 = 0.4275 g; L3 = 0.4652 g; L4 = 0.4396 g e L5 = 0.4854 g; significant differences in the time of use (p < 0.001) and cleaning method (p < 0.001). The L1 group showed the worst performance. Regardless of the experimental group, morphological analysis revealed alterations in the cutting blades soon after the first 12 minutes, being L1 the most affected group. Conclusion: The cleaning with wire brush was the most damaging method to the cutting efficiency and to the morphology of carbide burs.
Keywords
Dental instruments, morphology, efficiency, ultrasonics, dentistry, tungsten carbide
Resumo
Introdução: Atualmente, existem muitas dúvidas em relação aos métodos de limpeza de fresas, o que estimula o estudo desses métodos visando maior eficiência e menor prejuízo desses instrumentos rotatórios. Objetivo: Avaliar a influência de métodos de limpeza sobre a eficiência de corte e sobre as características morfológicas de fresas de aço inoxidável de carbeto de tungstênio (carbide). Material e método: Trinta fresas foram divididas em cinco grupos (n = 6), de acordo com o método de limpeza: L1- escova de aço; L2- escova de nylon; L3- ultrassom + água destilada; L4- ultrassom + solução desincrustante; L5- nenhum método de limpeza (controle). As fresas foram utilizadas para o corte de esmalte dental bovino durante seis períodos de 12 minutos cada. Após cada período, as fresas eram limpas (exceto L5) seguindo o protocolo estabelecido para cada grupo. A eficiência de corte foi determinada pelo método da perda de massa e as características morfológicas, por meio de análise fotomicrográfica. Resultado: As médias da quantidade de desgaste após 72 minutos de uso foram: L1 = 0,3558 g; L2 = 0,4275 g; L3 = 0,4652 g; L4 = 0,4396 g, e L5 = 0,4854 g. Houve diferença significante para o tempo de uso (p < 0,001) e o método de limpeza (p < 0,001). O grupo L1 apresentou pior desempenho. Independentemente do grupo experimental, a análise morfológica revelou alterações nas lâminas de corte a partir de 12 minutos, sendo o grupo L1 o mais afetado. Conclusão: O método mais prejudicial à eficiência de corte e que mais alterou as características morfológicas das fresas carbide foi a limpeza com escova de aço.
Palavras-chave
Instrumentos odontológicos, morfologia, eficiência, ultrassom, odontologia, carbeto de tungstênio
References
1. Jatzwauk L, Schone H, Pietsch H. How to improve instrument disinfection by ultrasound. J Hosp Infect. 2001; 48: 80-3. http://dx.doi. org/10.1016/S0195-6701(01)90019-2
2. Miller CH. Tips on preparing instruments for sterilization. Am J Dent. 2002; 15: 66. PMid:12074232.
3. Whitworth M, Martin MV, Gallagher M, Worthington HV. A comparison of decontamination methods used for dental burs. Br Dent J. 2004; 197: 635-40. PMid:15611751. http://dx.doi.org/10.1038/sj.bdj.4811832
4. Watanabe I, Ohkubo C, Ford JP, Atsuta M, Okabe T. Cutting efficiency of air-turbine burs on cast titanium and dental casting alloys. Dent Mater. 2000; 16: 420-5. http://dx.doi.org/10.1016/S0109-5641(00)00038-5
5. Elias K, Amis AA, Setchell DJ. The magnitude of cutting forces at high speed. J Prosthet Dent. 2003; 89: 286-391. PMid:12644805. http://dx.doi.org/10.1067/mpr.2003.35
6. Ercoli C, Rotella M, Funkenbusch PD, Russell S, Feng C. In Vitro comparison of the cutting efficiency and temperature production of ten different rotary cutting instruments. Part I: turbine. J Prosthet Dent. 2009; 101: 319-33. http://dx.doi.org/10.1016/S0022-3913(09)60064-0
7. Hovirus M. Disinfection and sterilization: the duties and responsabilities of dentists and dental hygienists. Int Dent J. 1992; 42: 241-4. PMid:1399042.
8. Brasil. Ministério da Saúde. Manual de procedimentos básicos em microbiologia clínica para o controle de infecção. Brasília; 1992.
9. Sheriteh Z, Hassan T, Sherriff M, Cobourne M. Decontamination prodedures for tungsten carbide debonding burs: a cross-sectional survey of hospital- based orthodontic departments. J Orthod. 2010; 37: 174-80. PMid:20805346. http://dx.doi.org/10.1179/14653121043074
10. Penel G, Iost A, Libersa JC. Cleaning implantation burs. Observation using scanning electron microscopy. Sci Stomatol Odontol. 2001; 43: 11-3.
11. Burkhart NW, Crawford J. Critical steps in instrument cleaning: removing debris after sonication. J Am Dent Assoc. 1997; 128: 456-63. PMid:9103796.
12. American Dental Association. Council on scientific affairs and American Dental Association Council on dental practice. Infection control recommendations for the dental office and the dental laboratory. J Am Dent Assoc.1996; 127: 672-80. PMid:8642147.
13. Miller CH. Cleaning, sterilization and disinfection: basics of microbial killing for infection control. J Am Dent Assoc. 1993; 124: 48-56.
14. Dyson JR, Darvel BW. The present status od dental rotatory cutting performance. Aust Dent. 1995; 40: 50-60. PMid:7710417. http://dx.doi.org/10.1111/j.1834-7819.1995.tb05615.x
15. Wilwerding T, Aiello A. Comparative efficiency testing 330 carbide dental burs utilizing Macor substrate. Pediatr Dent. 1990; 12: 170-1. PMid:2077493.
16. Galindo DF, Ercoli C, Funkenbusch PD, Greene TD, Moss ME, Lee HJ, et al. Tooth preparation: a study on the effect of different variables and a comparison between conventional and channeled diamond burs. J Prosthodont. 2004; 13: 3-16. PMid:15032891. http://dx.doi. org/10.1111/j.1532-849X.2004.04003.x
17. Patterson CJW, Mclundie AC. The effect of ultrasonic cleaning and autoclaving on tungsten carbide burs. Br Dent J. 1988; 164: 113-5. PMid:3162373. http://dx.doi.org/10.1038/sj.bdj.4806368
18. Tanaka N, Taira M, Wakasa K, Shintani H, Yamaki M. Cutting effectiveness and wear of carbide burs on eight machinable ceramics and bovine dentin. Dent Mater. 1991; 7: 247-53. http://dx.doi.org/10.1016/S0109-5641(05)80023-5
19. Reisbick MH, Bunshah RF. Wear characteristics of burs. J Dent Res. 1973; 52: 1138-46. PMid:4517752. http://dx.doi.org/10.1177/00220 345730520052301
20. Pines M, Schulman A. Characterization of wear of tungsten carbide burs. J Am Dent Assoc. 1979; 99: 831-3. PMid:290679.
21. Liao WM, Taira M, Ohmoto K, Shintani H, Yamaki M. Studies on dental high-speed cutting. J Oral Rehabil. 1995; 22: 67-72. http://dx.doi. org/10.1111/j.1365-2842.1995.tb00212.x
22. Ohmoto K, Taira M, Shintani H, Yamaki M. Studies on dental high-speed cutting with carbide burs used on bovine dentin. J Prosthet Dent. 1994; 71: 319-23. http://dx.doi.org/10.1016/0022-3913(94)90475-8
23. Miyawaky H, Taira M, Yamaki M. Cutting effective ness of diamond point on comercial core composite resins e cements. J Oral Rehabil. 1996; 23: 409-15. http://dx.doi.org/10.1111/j.1365-2842.1996.tb00872.x
24. Berman MH. Cutting efficiency in complete coverage preparation. J Am Dent Assoc. 1969; 79: 1160-7. PMid:4898719.
25. Reams GJ, Baumgartner JC, Kulild JC. Practical application of infection control in endodontics. J Endod. 1995; 2: 281-4. http://dx.doi. org/10.1016/S0099-2399(06)80999-4
26. Johnson GK, Perry FU, Pelleu GB. Effect of four anticorrosive dips on the cutting efficiency of dental carbide burs. J Am Dent Assoc. 1987; 114: 648-50.
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email