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  Indian J Med Microbiol
 

Figure 4: A vertically sectioned model demonstrating the technique for the placement of the apical barrier and MTA. (a)   Pre--operative condition of a tooth with a wide open apex; (b) K-file placed to gauge the diameter of the apical exit of the canal; (c) A system of two large-bore needles in place for placing the material directly in the apical region; (d) Barrier material (white colored) placed and pushed in the bony lesion; (e) Mineral trioxide aggregate (blue colored) placed against the barrier material at a thickness of 4-5 mm; (f) Thermoplasticized Gutta-percha compacted to the orifice level; (g) Composite resin used to seal the coronal access preparation

Figure 4: A vertically sectioned model demonstrating the technique for the placement of the apical barrier and MTA. (a)   Pre--operative condition of a tooth with a wide open apex; (b) K-file placed to gauge the diameter of the apical exit of the canal; (c) A system of two large-bore needles in place for placing the material directly in the apical region; (d) Barrier material (white colored) placed and pushed in the bony lesion; (e) Mineral trioxide aggregate (blue colored) placed against the barrier material at a thickness of 4-5 mm; (f) Thermoplasticized Gutta-percha compacted to the orifice level; (g) Composite resin used to seal the coronal access preparation