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SEM examination showed no topographical differences between instruments in different temperature groups. In relation to a limitation of this study, there was no difference in torsional resistance of NiTi rotary instruments between the BT and RT conditions. This implies that clinicians do not need to consider a decrease of torsional resistance of heat-treated NiTi instruments at BT.In this work, we present the effect of silica's specific surface area (180 m2·g-1 and 380 m2·g-1, respectively) on the crosslinking of styrene-butadiene rubber (
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