“…There was also no difference found in the number of cracks created when comparing ultrasonic retropreparation to the use of high‐speed burs for similar retropreparation , and ultrasonically prepared cavities were able to achieve an effective seal when filled with MTA, and even improved the sealing ability of inferior retrofilling materials . Diamond‐coated retropreparation tips, which are widely used, also do not appear to cause significant root‐end cracks , while stainless‐steel tips are able to cause a larger number of cracks than diamond‐coated tips . This, too, has been disputed, with a different study reporting stainless‐steel ultrasonic tips to produce no root‐end fractures .…”