Fracture resistance of roots re-instrumented with various retreatment systems


Creative Commons License

Er K., Taşdemir T., Hergüner Siso Ş., Çelik D., Cora S.

EUROPEAN JOURNAL OF DENTISTRY, cilt.5, sa.4, ss.387-392, 2011 (Scopus)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 5 Sayı: 4
  • Basım Tarihi: 2011
  • Dergi Adı: EUROPEAN JOURNAL OF DENTISTRY
  • Derginin Tarandığı İndeksler: Scopus
  • Sayfa Sayıları: ss.387-392
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

Objectives:

This study was designed to evaluate the fracture resistance of retreated roots using different rotary retreatment systems.

Methods:

Forty eight freshly extracted human canine teeth with single straight root canals were instrumented sequentially increasing from size 30 to a size 55 using K-files whit a stepback technique. The teeth were randomly divided into three experimental and one control groups of 12 specimens each. The root canals were filled using cold lateral compaction of gutta-percha and AH Plus (Dentsply Detrey, Konstanz, Germany) sealer in experimental groups. Removal of gutta-percha was performed with the following devices and techniques: ProTaper Universal (Dentsply Maillefer, Ballaigues, Switzerland), R-Endo (Micro-Mega, Besançon, France), and Mtwo (Sweden & Martina, Padova, Italy) rotary retreatment systems. Control group specimens were only instrumented, not filled or retreated. The specimens were then mounted in copper rings, were filled with a self-curing polymethylmethacrylate resin, and the force required to cause vertical root fracture was measured using a universal testing device. The force of fracture of the roots was recorded and the results in the various groups were compared. Statistical analysis was accomplished by one-way ANOVA and a post hoc Tukey tests.

Results:

There were statistically significant differences between the control and experimental groups (P<.05). However, there were no significant differences among the experimental groups.

Conclusions:

Based on the results, all rotary retreatment techniques used in this in vitro study produced similar root weakness.

Keywords: Fracture resistance, Retreatment, Root fracture, Rotary instruments