Influência de diferentes métodos de limpeza sobre a eficiência de corte e as características morfológicas de fresas Carbide

• Autor(a) principal: Fais, Laiza Maria Grassi [UNESP]
• Data de Publicação: 2011
• Outros Autores: Scardueli, Cassio Rocha [UNESP], Bordignon, Daniela Cristina, Silva, Regina Helena Barbosa Tavares da [UNESP], Guaglianoni, Dalton Geraldo [UNESP], Pinelli, Ligia Antunes Pereira [UNESP]
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.revodontolunesp.com.br/article/51ae4aa81ef1faca3d0037cf; http://hdl.handle.net/11449/125821
• topic: Dental instruments; Morphology; Efficiency; Ultrasonics; Dentistry; Tungsten carbide; Instrumentos odontológicos; Morfologia; Eficiência; Ultrassom; Odontologia; Carbeto de tungstênio

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.