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  Indian J Med Microbiol
 

Figure 25: Canal transportation and canal straightening by rotary files. Maxillary molars were instrumented with rotary files (the ProTaper). While the thinner instruments (such as the S1) could likely follow the curvature or S-shape of the canals, the thicker instruments were more rigid and caused transportation of the palatal canal (arrow) and straightening of the S-shaped canal ($ sign). Both represent damage to the remaining dentin by the excessive removal of sound dentin. In both cases, the "percent of canal wall unaffected by the procedure" was also compromised (adapted from Peters et al. 2003)[5]

Figure 25: Canal transportation and canal straightening by rotary files. Maxillary molars were instrumented with rotary files (the ProTaper). While the thinner instruments (such as the S1) could likely follow the curvature or S-shape of the canals, the thicker instruments were more rigid and caused transportation
of the palatal canal (arrow) and straightening of the S-shaped canal ($ sign). Both represent damage to the remaining dentin by the excessive removal of sound dentin. In both cases, the et al. 2003)[5]">