Fracture Resistance of Roots after Application of Different Sealers.
BACKGROUND
Vertical root fracture inevitably leads to tooth extraction. Thus, root filling with obturating materials and sealers that can reinforce the tooth would be an ideal way to reduce fracture in root treated teeth. This study aimed to assess the fracture resistance of roots following the application of different sealers including Epiphany, iRoot sealer and AH-plus.


METHODS
Fifty extracted human single-canal premolars without caries, curvature or cracks were used in this study. Tooth crowns were cut to yield 13-mm-long roots. Five roots were put in the negative control group and were left unprepared. Forty-five canals were prepared using ProTaper rotary files up to F3 and were then randomly divided into three groups based on the sealer type (n=15). The root canals were filled using cold lateral condensation technique with gutta-percha and AH-Plus sealer, gutta-percha and iRoot sealer and Resilon and Epiphany sealer, in groups one to three, respectively. The roots were then mounted in acrylic molds for fracture resistance testing and subjected to compressive load at a crosshead speed of 1mm/min until fracture. Data were analyzed using the one-way ANOVA.


RESULTS
The mean fracture resistance was 673.38±170.42 N in AH-Plus, 562.00±184.68 N in iRoot, 708.03±228.05 N in Resilon and 592.59±117.29 N in the control group. No statistically significant difference was found between the experimental groups and the negative control group (P=0.26).


CONCLUSIONS
Application of AH-Plus, bioceramic and Resilon sealers did not change the fracture resistance of roots compared to that of unprepared root canals.
Department of Endodontics, Dental School, Tehran University of Medical Sciences, International Campus , Tehran, Iran.
Fatemeh
F
Dibaji
Department of Endodontics, Dental School, Tehran University of Medical Sciences, International Campus , Tehran, Iran.
Farzaneh
F
Afkhami
General Dentist, Tehran, Iran.
Babak
B
Bidkhori
Statistical Consultant, Dental Research Center, Tehran University of Medical Sciences , Tehran, Iran.
Mohammad Javad
MJ
Kharazifard
AH-Plus; Bioceramic; Epiphany; Fracture Resistance; Resilon; Sealer; iRoot