Removal of Resin-based Root Canal Filling Materials with K3 Rotary Instruments: Relative Efficacy for Different Combinations of Filling Materials

Abstract

Removal of resin-based root canal filling materials may cause serious problems during root canal retreatment. This study compared the working time and amount of canal enlargement when different resin-based root canal filling materials were removed with K3 rotary instruments with or without heat-softening using System B. Root canal sealer/filling point combinations tested were Epiphany/Resilon, SuperBond/Resilon, SuperBond/gutta-percha, and Canals N/gutta-percha. The materials were filled into simulated curved resin canals and removed with K3 instruments in a standardized crown-down procedure. In terms of working time, Epiphany/Resilon required a significantly longer working time than the others. However, heat application with System B significantly reduced the working time for the removal of Epiphany/Resilon. In terms of canal enlargement, there were no significant differences among the tested groups as determined with digital morphometry. It was thus concluded that Epiphany removal with K3 rotary instruments might result in extended working time, but which could be reduced with heat-softening using System B.

Influence of the Diameter and Taper of Root Canals on the Removal Efficiency of Thermafil Plus Plastic Carriers Using ProTaper Retreatment Files

“…Recently, nickel-titanium (Ni-Ti) rotary instruments are used for removing root canal fillings (17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32), and specially designed instruments, such as ProTaper Retreatment Files (Dentsply Maillefer, Ballaigues, Switzerland), have been developed (24,26,29,31,32). Ni-Ti rotary instruments are also used for removing Thermafil plastic carriers (16,20,25); Thermafil Plus uses a grooved carrier to facilitate its removal by providing an access point for these instruments (33).…”

Root canal filling using Resilon: a review

“…18,17,136 An advantage of Resilon is that it can be removed in a similar manner to gutta-percha (Table 4). [137][138][139][140][141][142][143][144][145][146][147][148][149][150] A series of studies have compared the removal of Resilon to guttapercha with the time taken for removal and residual material remaining the main variables investigated. Most studies have concluded that Resilon is readily removable using a variety of techniques.…”

Efficacy of rotary Ni-Ti retreatment systems in root canals filled with a new warm vertical compaction technique

“…To properly remove the gutta-percha obturating material, many techniques and materials have been used in root canal-treated teeth. These include K-files or H-files, heat-carrying instruments, chemical solvents, ultrasonic instruments, engine driven rotary files such as Gates Glidden drill, GPX gutta-percha remover, NiTi rotary instruments, retreatment files (R-Endo, ProTaper and Mtwo retreatment files) heat carrier tips, ultrasonic files and lasers 2,[9][10][11] . The ProTaper retreatment file system (DentsplyMaillefer, Ballaigues, Switzerland) includes three retreatment instruments which are various tapers and diameters at the tip (D1, D2, D3).…”