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  Indian J Med Microbiol
 

Figure 15: Minimally invasive instrumentation of root canals. (a) An oval canal of a distal root of a mandibular molar. (b) A longoval canal of a maxillary second premolar. Red: Before; blue: After instrumentation with the SAF. Note the uniform dentin layer that was removed from the entire perimeter of the canal, with no attempt to machine the canal into a round cross-section (adapted from: Metzger et al. 2010).[20] (c) A maxillary molar instrumented with the SAF System. Green: Before; red: After. Note that the slightly oval palatal canal and the extremely oval mesiobuccal canal were prepared with the SAF according to their original shape (adapted from Peters and Paqué 2011).[24] (d) An extremely oval palatal canal that was prepared with the SAF. Green: Before; red: After. A uniform layer of dentin was removed from the entire canal perimeter. The round buccal canals were prepared as round canals (adapted from Solomonov 2011).[96] Note that any attempt to machine the oval canals in "a", "b" and the palatal canal in "d" to a round cross-section would have led to extreme removal of sound dentin while failing to clean the canal

Figure 15: Minimally invasive instrumentation of root canals. (a) An oval canal of a distal root of a mandibular molar. (b) A longoval canal of a maxillary second premolar. Red: Before; blue: After instrumentation with the SAF. Note the uniform dentin layer that was removed from the entire perimeter of the canal, with no attempt to machine the canal into a round cross-section (adapted from: Metzger <i>et al</i>. 2010).<sup>[20]</sup> (c) A maxillary molar instrumented with the SAF System. Green: Before; red: After. Note that the slightly oval palatal canal and the extremely oval mesiobuccal canal were prepared with the SAF according to their original shape (adapted from Peters and Paqué 2011).[24] (d) An
extremely oval palatal canal that was prepared with the SAF. Green: Before; red: After. A uniform layer of dentin was removed from the entire canal perimeter. The round buccal canals were prepared as round canals (adapted from Solomonov 2011).<sup>[96]</sup> Note that any attempt to machine the oval canals in