Influence of root canal irrigants on compressive strength and surface morphology of gray MTA Angelus®

Johnson Campideli Fonseca, Luiz Fernando Ferreira de Oliveira

Objective: The present study aims to evaluate the influence of root-canal irrigants in the compressive strength and surface morphological characteristics of gray MTA Angelus using scanning electron microscopy (SEM). Methods: The MTA was mixed according to the manu instructions from manufacturer and packed incrementally into silicone cylindrical molds with an internal diameter of 2 mm and a height of 4 mm. After the initial setting, 30 samples were randomly divided into 3 groups (n=10). In Group C (control) the samples were immersed in a saline solution, in Group MC the samples were immersed in a 2.5% sodium hypochlorite solution and in Group MH the samples were immersed in a 2% chlorhexidine digluconate solution, all remaining for 1 hour. After rinsed, the compressive strength was measured in an Instron 4410 test machine with a crosshead speed of 0.5 mm / min. The surface morphological characteristics were determined by scanning electron microscopy (SEM). The statistical significance in compressive strength was evaluated by one-way analysis of variance (α=0,05). Results: The average compressive strength values (MPa) were 69.24±7.32 (Group C), 64.74±9.21 (Group MC) e 71.15±11.54 (Group MH), with no significant difference. The results of SEM had demonstrated that the microstructures from group C and MH were crystalline, composed of cubic crystals. A granular structure, in which crystals had not formed, was observed in the Group MC. Conclusion: The immersion in root-canal irrigants did not affect the compressive strength of MTA, with changes only in surface morphological characteristics. Further studies are needed to determine the clinical relevance of this crystal structure.

Keywords: Endodontics. Compressive strength. Microscopy.

How to cite: Fonseca JC, Oliveira LFF. Influence of root canal irrigants on compressive strength and surface morphology of gray MTA Angelus®. Dental Press Endod. 2011 Oct-Dec;1(3):34-40.

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