IADR Abstract Archives
Micro-CT Analyses of Different Posts and Cement Materials
Objectives: This evaluation aimed to quantify the volume of voids and the bonded surface area resulting from cast, fiber and anatomic fiber posts cementation technique using micro-computed tomography (microCT) scanning technology/3D reconstructing software.
Methods: 3 post systems (cast, fiber and anatomic fiber posts) were cemented to endo treated bovine teeth (n=3 per group) and samples micro-ct scaned.The outer surface and the spatial relationship of dentin, post, cement layer, and voids were recosntructed. In order to estimate the volume of voids and bonded surface areas, the 3D-models of the teeth were digitally sectioned by the apical aspect of the posts and above the cement-enamel junction acquiring a total of 361 DICOM images per sample. The Amira software processed the image segmentation. The resolution limit employed by such process was from zero to 255 (gray scale contrast). After all structures have been segmented, a 3D model was generated to visualize the internal architecture arrangement and cement interface/voids calculated. Percetange of voids present were reported in percentile for qualitative comparisons.
Results: Initial analyses of 3D spatial architecture of structures and volumetric analysis revealed that 9.89% of the resin cement was composed by voids. Cast and anatomic fiber posts presented 1,85% and 1.78 % respectively of the resin cement with voids.
Conclusions: MicroCT technology was able to non-destructively measure the volume of voids within the cement layer and the bonded surface area at the root/cement/post interfaces. Cast and anatomic posts presented less voids (percentage) after post cementation procedures.
Methods: 3 post systems (cast, fiber and anatomic fiber posts) were cemented to endo treated bovine teeth (n=3 per group) and samples micro-ct scaned.The outer surface and the spatial relationship of dentin, post, cement layer, and voids were recosntructed. In order to estimate the volume of voids and bonded surface areas, the 3D-models of the teeth were digitally sectioned by the apical aspect of the posts and above the cement-enamel junction acquiring a total of 361 DICOM images per sample. The Amira software processed the image segmentation. The resolution limit employed by such process was from zero to 255 (gray scale contrast). After all structures have been segmented, a 3D model was generated to visualize the internal architecture arrangement and cement interface/voids calculated. Percetange of voids present were reported in percentile for qualitative comparisons.
Results: Initial analyses of 3D spatial architecture of structures and volumetric analysis revealed that 9.89% of the resin cement was composed by voids. Cast and anatomic fiber posts presented 1,85% and 1.78 % respectively of the resin cement with voids.
Conclusions: MicroCT technology was able to non-destructively measure the volume of voids within the cement layer and the bonded surface area at the root/cement/post interfaces. Cast and anatomic posts presented less voids (percentage) after post cementation procedures.