Abstract
Forty single-canal extracted human teeth with apical curvature of 10 to 35 degrees were instrumented using the crown-down pressureless technique and the other half using a traditional filing technique. Five similar uninstrumented teeth served as controls. Xantopren Blue impression material was injected under vacuum into the root canal systems of all of the specimens, which were then cleared. The specimens were evaluated by five independent evaluators according to several desirable and undesirable instrumentation parameters, and an overall rating was given. Statistical analysis showed a significant difference only in the overall rating. The crown-down pressureless technique received significantly more excellent ratings, while the conventional method received significantly more poor ratings. The crown-down pressureless technique was shown to be an effective method for instrumenting the curved root canals in this study.
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