19 Most of the unrestored files were the small files size (20/0.04 or 20/0.06), this trend of the inability of small files to recover corroborated the findings of other studies, which showed a trend toward a high incidence of distortion and separation in small NiTi instruments. 20 - 23 An analysis of used HyFlex ® instruments indicated that most of the files showed visible plastic deformation such as unwinding and curving.
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