Restor Dent Endod.  2015 Feb;40(1):85-90. 10.5395/rde.2015.40.1.85.

Canal preparation with nickel-titanium or stainless steel instruments without the risk of instrument fracture: preliminary observations

Affiliations
  • 1Private practice, Toronto, ON, Canada. ghassanyared@gmail.com

Abstract

This report introduces a novel technique that allows a safe and predictable canal negotiation, creation of a glide path and canal preparation with reciprocating nickel-titanium or stainless steel engine-driven instruments in canals where the use of rotary and the newly developed reciprocating instruments is contraindicated. In this novel technique, the instruments are used in reciprocating motion with very small angles. Hand files are not used regardless of the complexity of the canal anatomy. It also allows achieving predictable results in canal negotiation and glide path creation in challenging canals without the risk of instrument fracture.

Keyword

Canal negotiation; Endurance limit; Glide path; Reciprocation

MeSH Terms

Hand
Negotiating
Stainless Steel*
Stainless Steel

Figure

  • Figure 1 Pre-curved instruments. (a) Mtwo 10.04 file; (b) R25 file.

  • Figure 2 Root canal treatment on tooth No. 27. (a) Cone fit radiograph with pre-curved R25 in distobuccal canal. Canal negotiation, glide path creation, and canal preparation in distobuccal canal was accomplished with pre-curved Mtwo 10.04 and R25 instruments used in reciprocating motion (Forward, 6 degrees; Reverse, 1 degree). The palatal canal was enlarged with an R50 instrument at the working length; (b) Obturation radiograph.

  • Figure 3 Root canal treatment on tooth No. 37. (a) Cone fit radiograph. The use of reciprocating motion at small angles (Forward, 6 degrees; Reverse, 1 degree) allowed the successful canal negotiation, glide path creation, and canal preparation of the mesial canal with only one straight R25 instrument despite the presence of a severe apical curvature; (b) Obturation radiograph.

  • Figure 4 Root canal treatment on tooth No. 26 with a complex mesiobuccal (MB) root canal system. (a) Pre-operative radiograph. Canal negotiation and canal preparation of MB2 canal were done with pre-curved engine driven K-reamer instruments with sizes 10 to 25 and 2% taper (VDW Dentsply, Munich, Germany) used in reciprocating motion; (b) Obturation radiograph.

  • Figure 5 Retreatment of tooth No. 36. (a) Pre-operative radiograph. The use of an R25 instrument in reciprocation at small angles (Forward, 6 degrees; Reverse, 1 degree) allowed unblocking the apical millimetres in both mesial and distal canals. Previous several attempts to unblock those canals with hand files were unsuccessful; (b) Radiograph with R25 instruments short of the desired working length; (c) Obturation radiograph after unblocking both canals.


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