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  Indian J Med Microbiol
 

Figure 30: The use of SAF in retreatment. (a) Mesial roots of mandibular molars were initially prepared with #40 curved K files and then obturated. (b) When retreatment was performed using D1-D3 ProTaper retreatment files, 35% of the apical third of the canal was still covered with radiopaque residue. (c) Supplementary treatment where the residue was softened with chloroform and the residue was scrubbed using the SAF resulted in a reduction of the residue to 7% of the apical third area of the canal. Please note: In such curved canals, larger rotary instruments are not an option as they may cause severe damage to the remaining dentin of the root (adapted from Abramovitz et al. 2012).[53] (d) A similar 3D micro-CT study in oval canals found that ProTaper retreatment fi les followed by the Protaper F2 left root fi lling debris that represented 5.39% of the volume of the root fi lling. Using the ProFile #20/06 followed by a 2.0- mm diameter SAF left only 0.41% of residue in the root canal (adapted from Solomonov et al. 2012)[54]

Figure 30: The use of SAF in retreatment. (a) Mesial roots of mandibular molars were initially prepared with #40 curved K files and then obturated. (b) When retreatment was performed using D1-D3 ProTaper retreatment files, 35% of the apical third of the canal was still covered with radiopaque residue. (c) Supplementary treatment where the residue was softened with chloroform and the residue was scrubbed using the SAF resulted in a reduction of the residue to 7% of the apical third area of the canal. Please note:
In such curved canals, larger rotary instruments are not an option as they may cause severe damage to the remaining dentin of the root (adapted from Abramovitz <i>et al</i>. 2012).<sup>[53]</sup> (d) A similar 3D micro-CT study in oval canals found that ProTaper retreatment fi les followed by the Protaper F2 left root fi lling debris that represented 5.39% of the volume of the root fi lling. Using the ProFile #20/06 followed by a 2.0- mm diameter SAF left only 0.41% of residue in the root canal (adapted from Solomonov <i>et al</i>. 2012)<sup>[54]</sup>