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This study evaluated the integrity of calcium silicate sealer–based fillings made with hygro-expandable cones (HEC) that are commercially known as CPoint or Smartpoint.

Fourteen human canines were prepared according to a standardized, conventional endodontic treatment protocol and filled with the HEC/calcium silicate sealer. Three-dimensional imaging was performed with laboratory micro–computed tomography (μCT) at its highest resolution and was compared with synchrotron phase contrast-enhanced μCT (PCE-CT) scans of the treatment extending 1–7 mm from the apex. Conventional destructive optical microscopy validated observations by comparison with virtual slices in the tomographic data.

Conventional laboratory μCT at 10-μm resolution did not reveal the existing voids and defects within the root canal fillings. PCE-CT revealed elongated interfacial delamination …