Influence of Different Types of Intracanal Medicaments and Root Canal Sealers on Root Dentine Fracture Resistance at 2 Different Time Intervals.

INTRODUCTION

To investigate the influence of different types of intracanal medicaments and root canal sealers on root dentine fracture resistance at different time intervals.

METHODS

A total of 180 single-rooted human mandibular premolars were used. Samples were divided into 3 groups: negative control (unprepared and unfilled, n = 10), positive control (prepared but unfilled, n = 10), and experimental groups (10 groups, n = 15). Root canals were prepared chemomechanically. In single-visit groups, canals were filled with either AH Plus or Bio-C Sealer. In medicament-applied groups, Ultracal XS or Bio-C Temp was applied for 1 week or 1 month before obturation with AH Plus or Bio-C Sealer. Root dentine fracture resistance was measured under vertical loading using a universal testing machine. Material-dentine interface of 10 experimental samples were examined using scanning electron microscope/energy dispersive x-ray spectroscopy. Data were analyzed using the analysis of variance followed by post hoc Tukey's tests, with significance set at P < .05.

RESULTS

Root dentine fracture resistance was highest in the negative control and lowest in the positive control (P < .001). Single-visit groups demonstrated significantly higher root dentine fracture resistance than the medicament-applied groups (P < .001). No significant differences were found in the single-visit AH Plus and Bio-C Sealer (P > .05). Similarly, no significant difference was observed between the groups filled with AH Plus or Bio-C Sealer after application of Ultracal XS or Bio-C Temp (P > .05). Furthermore, the time of medicament application (1 week-1 month) was found to have no significant effect on root dentine fracture resistance (P > .05).

CONCLUSIONS

Different intracanal medicaments (Ultracal XS, Bio-C Temp) and root canal sealers (AH Plus, Bio-C Sealer) exhibited similar effects on root dentine fracture resistance at different time intervals. However, both Ultracal XS and Bio-C Temp may adversely affect root dentine fracture resistance due to their tendency to leave residues on the dentine surface.