ABSTRACT
Objetivo: Este estudo propõe-se avaliar a perda de corte do instrumento rotatório ProTaper® em função do número de uso e esterilização em autoclave. Método: Foram estudados 10 canais simulados de resina acrílica transparente com ângulo de curvatura de 45º, valendo-se de instrumentos Protaper® de numeração S1, S2, F1, F2 e F3, substituindo o Sx pelas brocas de Largo #1. Os blocos foram pesados em balança analítica digital, anotando-se o peso inicial. A seguir, houve o preparo com motor elétrico Endo Pro-Torque® da Driller com reverso automático submetido ao ajuste e controle da velocidade em 350 rpm, torque de 1N, com engate para contra-ângulo modelo Kavo®, tomando-se o cuidado de padronizar o tempo de ação de cada instrumento em 3 minutos. Usou-se o creme de Endo-PTC durante o preparo do canal simulado e após seu tempo de ação, lavava-se o canal com hipoclorito de sódio. Depois, o bloco era lavado com detergente neutro, seco com gaze, canal aspirado, seco com cone de papel absorvente, pesado, anotando-se o peso final. A cada uso as limas rotatórias eram limpas com gaze embebido em álcool e, posteriormente, lavadas com detergente neutro e secas também com gaze e levadas em envelope descartável para processo de esterilização em autoclave com ciclo de 20 minutos. Resultados: Os instrumentos utilizados perderam a sua capacidade de corte em função do número de uso. Conclusão: O instrumento perde a capacidade de corte em função do uso, e só a partir do sé¬timo uso, o instrumento ProTaper® perde consideravelmente sua efetividade, recomendando-se seu descarte
Aims: This investigation aims to evaluate the cutting loss and sterilization of rotary ProTaper® instrument for sterilization process in autoclave. Method: Were studied ten substrate resin simulated canals blocks numbered 1 to 10 with angle of 45º. Before and after instrumentation were used with ProTaper® files numbering S1, S2, F1, F2, F3, is substituting for the Sx Largo drills # 1. These blocks were weighted using an analytical digital scale model Mettler AJ 100 and following it were analyzed of the amount of resin removed in each sample were noted both initial and final weight. The instrumentation was made with Endo-Pro-Torque engine-driven Driller system with automatic reverse and speed control in 350 rpm, torque 1N using stop watch for standardize the 3 minutes time of each instrument. Cream Endo-PTC was used during instrumentation e after that, washing the canals with 5mL the distillate water with plastic syringe. The blocks were washed with detergent, dry with gauze, aspirated canal, dried with paper absorbent points, weighted and noted final weight. In each use the files were clean with gauze alcohol soaked and later washed with detergent and dried with gauze and put in recipient discard able for sterilization in autoclave Sercon model during 20 minutes. Results: The instruments used have lost the cutting ability in relation to the number of use. Conclusions: It?s concluded that occurred a loss of efficiency of the cutting instrument, however the instrument ProTaper loses its cutting ability in use only after the seventh use and thus it?s recommended its discard
Subject(s)
Dental High-Speed Technique , Dental Cavity Preparation , Dental InstrumentsABSTRACT
PURPOSE: This study was aimed to evaluate the effect of implant drilling speed on the composition of particle size of collected bone debris. METHODS: Branemark System (R)drills were used to collect bone debris from 10 drilling holes (1 unit) at 1,500 rpm (Group A) and 800 rpm (Group B) in bovine mandible. After separating particles by size into > 500 microm, between 250 microm and 500 microm, and 500 microm fractions, Group B had significantly higher wet volume % (P = 0.0059) and dry volume % (P = 0.0272) than in Group A. CONCLUSIONS: The drilling speed influenced the composition of particle size in collected drilling bone debris. The drilling in 800 rpm produced the more percentage of large particles than in 1,500 rpm. However, the drilling speed didn't effect on total volume of and weight of bone debris.
Subject(s)
Dental High-Speed Technique , Dental Implantation , Mandible , Mandrillus , Particle SizeABSTRACT
El objetivo de este trabajo fue el de evaluar la microfiltración marginal producida en cavidades cuya profundidad alcanzaba a la dentina en dientes bovinos. Con esta finalidad fueron confeccionadas cavidades utilizando dos sistemas diferentes de preparación: punta diamantada CVD ultrasónica y puntas diamantadas en alta rotación. Una vez terminada la preparación de las cavidades estas fueron restauradas con resina compuesta para a seguir, los cuerpos de prueba ser almacenados en una solución de suero fisiológico durante una semana tiempo después del cual fueron preparados para realizar a los ciclos térmicos correspondientes para posteriormente realizar su inmersión en una solución de fucsina básica a 0.5 por ciento. Los cuerpos de prueba fueron cortados y lijados para poder observarlos en el microscopio óptico. La medición cuantitativa de la microfiltración marginal fue realizada por medio de la imagen digitalizada y de un software específico. Al someter los resultados al análisis estadístico de Mann-Whitney fue comprobada una acentuada infiltración marginal en ambos grupos sin mostrar diferencia estadística significativa entre ellos, sugiriendo como consecuencia que la técnica de preparación cavitaria no tuvo influencia sobre la microfiltración marginal en restauraciones de resina compuesta
The aim of this study was to evaluate the marginal microleakage in cavities with depth in bovine tooth dentin. Cavities preparation were made in two groups using conventional diamond burs associated with air turbine and ultrasonic CVD diamond tip with ultrasound. Cavities were restored with composite resin and after thermocycled, teeth were immersed in basic fucsin, sectioned, sandpapered and analyzed by an optical microscope. Microleakage quantitative evaluation was obtained through a digitalized image and a software program. Mann-Whitney test showed high amount of marginal microleakage in both groups without any statistically significant difference, suggesting that cavity preparation technique had no influence on marginal microleakage of composite resin restorations