Evaluation of fracture resistance of roots-filled with various root canal sealers at different time periods

Abstract

Purpose

The reinforcement effect of 3 various root canal sealers (AH 26, MTA Plus sealer and

BioRoot RCS) and gutta-percha at different time periods (1 week and 1 month) were

evaluated in the present study.

Materials and Methods

Single-rooted, single-canalled, cracks-free 80 mandibular premolars were

decoronated to a length of 13mm. Group PC (positive control, n=10): samples were

left unprepared and unfilled. Seventy samples were prepared by using the ProTaper

Rotary System up to F4. Group NC (negative control, n=10): samples were left

unfilled. Remaining 60 samples were assigned into 3 groups; Group 1: AH 26 + F4

gutta-percha (GP); Group 2: MTA Plus sealer + F4 GP and Group 3: BioRoot RCS + F4

GP. Filled samples were divided into subgroups according to storage time: Samples

in Groups 1A, 2A, and 3A were stored for 1 week; while Groups 1B, 2B and 3B were

stored for 1 month at 100% humidity to allow the complete setting of the sealers

(n=10, for each). A universal testing machine at a crosshead speed of 1.0 mm/min

was used for fracture testing. For each specimen, the force at the time of fracture

was recorded and the data were analyzed statistically.

Results

The highest fracture resistance values were obtained in Group PC, while the lowest

values were obtained in Group NC. Groups PC and NC were statistically different

from each other and from other groups, regardless of time (p<0.05). Fracture

resistance values of Group AH 26/GP were statistically different from MTA Plus

sealer/GP (p<0.05) and were statistically similar with BioRoot RCS/GP, irrespective of

time. Within group comparisons revealed that there were no statistically differences

between samples filled with same sealer at different time periods.

Conclusion

Root canal preparation caused decreased fracture resistance. All sealers increased

the force values needed to fracture the filled samples compared to unfilled ones.

Time factor had no effect on the fracture resistance values.

Keywords

• Calcium silicate sealer,root canal obturation,vertical root fracture,time,endodontics

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