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  Indian J Med Microbiol
 

Figure 20: Packing of dentin particles into an isthmus: Rotary file vs. SAF. Mesial roots of mandibular molars that contained two canals connected by an isthmus were treated with either (a) rotary files with syringe and needle irrigation or (b) the SAF System with its continuous irrigation. Left: Before instrumentation; right: After instrumentation. Gray: Area of the isthmus that was radiolucent before and turned radiopaque after instrumentation due to the packing of dentin particles. Note the massive amount of packed debris in the rotary files-treated case compared with the limited amount in the SAF-treated case. The SAF file does not rotate in the canal and does not cut dentin chips. The SAF removes dentin from the walls as a thin powder, which is suspended in and carried out by the continuous fl ow of irrigant, thus avoiding the packing phenomenon (adapted from Paque et al. 2012)[78]

Figure 20: Packing of dentin particles into an isthmus: Rotary file vs. SAF. Mesial roots of mandibular molars that contained two canals connected by an isthmus were treated with either (a) rotary files with syringe and needle irrigation or (b) the SAF System with its continuous irrigation. Left: Before instrumentation; right: After instrumentation. Gray: Area of the isthmus that was radiolucent before and turned radiopaque after instrumentation due to the packing of dentin particles. Note the massive amount of packed debris in the rotary files-treated case compared with the limited amount in the SAF-treated case. The SAF file does not rotate
in the canal and does not cut dentin chips. The SAF removes dentin from the walls as a thin powder, which is suspended in and carried out by the continuous fl ow of irrigant, thus avoiding the packing phenomenon (adapted from Paque <i>et al</i>. 2012)<sup>[78]</sup>