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Separation is a potential risk when using any instrument in the root canal system. Presently, there are no large clinical studies investigating the separation incidence of the ProTaper rotary file system or the number of times a ProTaper rotary file can be safely used. The purpose of this study was to determine if the number of uses affects the separation incidence of ProTaper rotary instruments....
The search for new and better thermoelectric (TE) materials has recently brought to light a somewhat forgotten class of compounds, the clathrates of group 14. The rich phenomenology of these and related cage-like structures has driven the most recent research on their electronic, magnetic, spectral, and conducting properties [Rowe, ed., 1995]. The present studies try to address the issue whether the...
An examination of 5616 endodontically treated and retreated maxillary first and second molars was made in an attempt to determine the percentage of MB2 canals that could be located routinely, and evaluate if there were any significant differences between initial treatments and retreatments. The teeth examined were 3578 first molars and 2038 second molars treated consecutively over a 5-yr period by...
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