An in vitro comparison of the efficacy of the stepback technique versus a step-back/ultrasonic technique in human mandibular molarsComparacion In vitro de la eficacia de la tecnica escalonada versus la tecnica escalonada ultrasonica en Mòlares inferiores de humanos*,**

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This study compared the effect of the step-back preparation versus a step-back/ultrasound preparation on the tissue removal from the mesial root canals of 60 extracted human mandibular molars. The step-back/ultrasound preparation significantly cleaned isthmuses at both levels and canals at the 1-mm level more effectively than the step-back preparation. Statistical analysis indicated no significant difference, in canal cleanliness at the 3-mm level, between the step-back and the step-back/ ultrasound groups. There were no significant differences demonstrated in isthmus cleaning ability when comparing the step-back group with the control group, at both the 1- and 3-mm levels. At the 1-mm level, operator 1 significantly cleaned canals in the step-back group more effectively than operator 2. However, in the step-back/ultrasound group, no significant differences were demonstrated between operators in their ability to clean canals at this level. In both experimental groups, operator comparisons indicated no significant differences in isthmus cleanliness at the 1-mm level.

Este estudio comparó el efecto de la preparación escalonada versus la preparación escalonada por ultrasonido en la remoción de tejido del conducto de la raiz mesial de 60 molares humanos inferiores extraídos. La preparación escalonada por ultrasonido limpió los istmos en ambos niveles significati-vamente y los conductos a un nivel de 1 mm más efectivamente que la preparación escalonada. El análisis estadístico no indicó diferencias significativas en la limpieza del conducto a un nivel de 3 mm entre los grupos de técnica escalonada y técnica escalonada por ultrasonido. No se demostraron diferencias significativas en la capacidad de limpieza de los itstmos cuando se comparó el grupo de técnica escalonada con el grupo de control, tanto en el nivel de 1 mm como en el de 3 mm. En el nivel de 1 mm, el operador 1 limpió los conductos en el grupo de técnica escalonada en forma significati-vamente más efectiva que el operador 2. Sin embargo, en el grupo de técnica escalonada por ultrasonido, no se demostraron diferencias de importancia entre los operadores en su capacidad de limpiar los conductos a este nivel. En ambos grupos experimentales, las comparaciones del operador no indicaron diferencias significativas en la limpieza de los istmos en un nivel de 1 mm.

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This study was supported by research funding from the Ohio Association of Endodontists.

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This article was adapted from a thesis submitted by Dr. Goodman in partial fulfillment of the requirements for the MS degree at Ohio State University, Columbus, OH. A portion of this article was presented at the 41st Annual American Association of Endodontists meeting, Toronto, Canada, and was honored by a graduate student research award.

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Dr. Goodman is in private practice limited to endodontics, Atlanta, GA. Dr. Reader is associate professor, Department of Endodontics, Ohio State University, Columbus, OH. Dr. Beck is associate professor, Department of Oral Diagnosis, Oral Medicine, Ohio State University. Dr. Melfi is professor and assistant dean, Department of Oral Biology, Ohio State University. Dr. Meyers is professor and chairman, Department of Endodontics, Ohio State University.

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