Effect of root perforation repair with mineral aggregate-based cements on the retention of customized fiberglass posts

[Abstract] The purpose of this study was to investigate whether the root perforation repair with mineral aggregate-based cements affects the retention of customized fiberglass posts to bovine intraradicular dentin. Sixty-four bovine mandibular incisors had their root canals endodontically treated and prepared for fiberglass posts luting. Teeth were randomly distributed into four groups (n=16), according to the cement used for the perforations repair (MTA HP; calcium aluminate cement-CAC; and CAC+calcium carbonate nanoparticles-nano-CaCO3) and control group (no perforation). The groups were redistributed according to the fiberglass posts luting protocol (n=8): total-etching (TE) (MTA HP/TE; CAC/TE; CAC+CaCO3/TE and control/TE) and self-etching (SE) (MTA HP/SE; CAC/SE; CAC+CaCO3/SE and control/SE). Roots were sectioned into 1.3 mm-thick dentin slices obtaining samples that were submitted to the push-out test in Universal Testing Machine (Instron, Model 4444-0.5 mm/min). The fractured samples were analyzed under stereomicroscope and Scanning Electron Microscope (SEM). CAC/TE and CAC/SE groups had significant difference between the cervical and middle thirds (p