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  Indian J Med Microbiol
 

Figure 27: "Danger zone" in a C-shaped canal. This C-shaped canal was instrumented with the SAF System. Green: Before; red: After. If such a canal was treated with ultrasonic files, the only current effective alternative, the chance of excessively thinning the wall or even causing a strip perforation in the area marked by the arrow would be high. Such danger zones cannot be recognized from within the root canals or from periapical radiographs. Minimally invasive shaping with the SAF System represents a safe alternative

Figure 27: