Following root-end resection, the purpose of a root-end filling material is to provide a seal to prevent the leakage of irritants into the periapical tissues and prevent egress of bacteria and inflammatory mediators in the apical tissues into the root canal system. The material’s dimensional stability during setting can affect its marginal adaption to the cavity walls, where microscopic shrinkage can result in gaps and microscopic expansion can further close the interfaces in vivo. In vitro, hydroscopic shrinkage using DIC was observed for Biodentine, whereas expansion was seen for ERRM-FS and W-MTA, with the means being statistically significantly different (p<0.0001). The groups that complied with the maximum 1% shrinkage and 0.1% expansion requirement included Biodentine (-0.01 ± 0.21%) and W-MTA group, excluding the presence of cracks (0.06 ± 0.36%). ERRM-FS exceed the 0.1% expansion recommendations, with expansion in the overall ERRM-FS group and group without cracks measuring 1.86 ± 1.34% and 0.71 ± 0.19%, respectively. In the present study, the occurrence of cracking was significant (p<0.0001), where more fractures were observed in premixed materials with large expansion (Cavit, ERRM-FS). Compared to the x-direction, constraints in the y- direction were always greater, which could set up tensile stresses capable of fracturing the filling materials.
University of Minnesota M.S. thesis.September 2017. Major: Dentistry. Advisor: Scott McClanahan. 1 computer file (PDF); x, 59 pages.
Dimensional Changes And Strain Analysis Of Pro-Root White Mineral Trioxide Aggregate, Endosequence Root Repair Material-Fast Set Putty, And Biodentine During Setting.
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