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

Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Sciences, Niigata University Graduate School of Medical and Dental Sciences, 2-5274, Gakko-cho-dori, Chuo-ku, Niigata 951-8514, Japan.
Dental Materials Journal (Impact Factor: 0.97). 02/2008; 27(1):75-80. DOI: 10.4012/dmj.27.75
Source: PubMed


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.

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    • "But one study showed that there were no significant differences between gutta-percha and Resilon regarding the time needed for removal.112,121 In relation to the instruments used for the removal of filling materials, it has been shown that rotary files with chloroform are more effective than rotary files with heat,110 K3 than Liberator files, 111 Gates-Glidden than system B116 and heat than K3.122 There were no significant differences between Mtwo, Twisted files, Protaper and R-Endo115 and Hedestrome files in terms of Resilon removal.118 "
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    ABSTRACT: Background and aims. An ideal root canal filling material should completely seal the entire root canal space and block communication between the root canal system and its surrounding tissues; it should also be nontoxic, noncarcinogenic, non-genotoxic, biocompatible, insoluble in tissue fluids and dimensionally stable. Bonding to dentin is a promising property, which can prevent leakage and improve the sealing ability of root canal filling materials. Resilon was developed and rec-ommended initially because the existing rootcanal filling materials did not bond to root canal dentin. Since its introduction in 2004, numerous reports have been published regarding various aspects of this material. The aim of this literature review is to present investigations regarding Resilon’s physical and chemical properties and leakage studies. Materials and methods. A review of the literature was performed by using electronic and hand searching methods for Resilon from May 2004 to April 2012. Results. There are many published reports regarding Resilon. The searchshowed that Resilon is composed of a parent polymer, polycaprolactone or Tone, which is a biodegradable aliphatic polyester, with filler particles consisting of bioactive glass, bismuth oxychloride and barium sulfate. It possesses some antibacterial and antifungal properties. It is a promising material for root canal filling. Despite the presence of numerous case reports and case series regarding these applications, there are few designed research studies on clinical applications of this material. Resilon has some drawbacks such as high cost. Conclusion. Resilon seals well and is a biocompatible material. However, more clinical studies are needed to confirm its efficacy compared with other materials.
    Full-text · Article · Aug 2013
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    • "Commonly used sealers include zinc oxide–eugenol-based cements, glass-ionomer cements, resins and silicones. To remove the root filling materials, hand, rotary and ultrasonic instruments can be used (Friedman et al. 1992, 1993, Moshonov et al. 1994, Wolcott et al. 1999, Bramante & Betti 2000, Imura et al. 2000, Sae-Lim et al. 2000, Ferreira et al. 2001, Ezzie et al. 2006, Schirrmeister et al. 2006 a–d, Zmener et al. 2006, Barletta et al. 2007, 2008, Hassanloo et al. 2007, Hammad et al. 2008, Iizuka et al. 2008, Somma et al. 2008, Tasdemir et al. 2008a,b) with or without solvents or heat to facilitate the procedure (Tamse et al. 1986, Wilcox et al. 1987, Wolcott et al. 1999). Regardless of the retreatment technique and the materials removed, studies have invariably reported the presence of root filling residue on the canal walls (Wilcox et al. 1987, Friedman et al. 1992, 1993, Moshonov et al. 1994, Masiero & Barletta 2005, Hassanloo et al. 2007). "
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    ABSTRACT: Roggendorf MJ, Legner M, Ebert J, Fillery E, Frankenberger R, Friedman S. Micro-CT evaluation of residual material in canals filled with Activ GP or GuttaFlow following removal with NiTi instruments. International Endodontic Journal, 43, 200–209, 2010. Aim To assess the efficacy of removing Activ GP or GuttaFlow from canals using NiTi instruments. Methodology Root canals in 55 extracted pre-molars were prepared to apical size 40, 0.04 taper. The teeth were imaged with micro-CT, and 30 teeth selected that had consistent apical size and taper of the shaped canals. They were randomly assigned to root filling with either the glass-ionomer-based ActivGP system (n = 15) or the polyvinylsiloxane-based GuttaFlow system (n = 15). After 2 weeks, canals were retreated stepwise with size 40–50 EndoSequence 0.04 taper instruments. Micro-CT scans (8 μm) were taken after use of each instrument to detect root filling residue in the coronal, middle and apical segment, and the retreatment time recorded. Residue, expressed as percentage of canal surface area, was compared between groups with t-tests, and within groups with repeated measures anova and Bonferroni-adjusted pairwise comparisons. Retreatment time was analysed with one-way anova. Results The percentage of sealer residue-coated canal surface was consistently highest (P < 0.001) in the apical third of canals, and it did not differ significantly between the two root filling groups. Stepwise enlargement from size 40 to 50 significantly decreased the amount of sealer residue in both groups (P < 0.001). Retreatment time did not differ significantly between groups. Conclusions Both root fillings with ActivGP and GuttaFlow were removed with nickel-titanium rotary instruments. Enlargement of canals up to two sizes beyond the pre-retreatment size was necessary to minimize the amount of sealer remaining.
    Full-text · Article · Feb 2010 · International Endodontic Journal
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