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CC BY-NC-ND 4.0 · Eur J Dent 2011; 05(04): 387-379
DOI: 10.1055/s-0039-1698910
Original Article
Dental Investigation Society

Fracture Resistance of Retreated Roots Using Different Retreatment Systems

Kursat Er
a   Akdeniz University, Faculty of Dentistry, Department of Endodontics, Antalya, Turkey.
,
Tamer Tasdemir
b   Karadeniz Technical University, Faculty of Dentistry, Department of Endodontics, Trabzon, Turkey.
,
Seyda Herguner Siso
c   Cumhuriyet University, Faculty of Dentistry, Department of Restorative Dentistry, Sivas, Turkey.
,
Davut Celik
b   Karadeniz Technical University, Faculty of Dentistry, Department of Endodontics, Trabzon, Turkey.
,
Sabri Cora
b   Karadeniz Technical University, Faculty of Dentistry, Department of Endodontics, Trabzon, Turkey.
› Author Affiliations
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Publication History

Publication Date:
30 September 2019 (online)

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ABSTRACT

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. (Eur J Dent 2011;5:387-392)

Key words:

Fracture resistance - Retreatment - Root fracture - Rotary instruments
 

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