Endo causes perio because 1. Bacterial products from infected root canals can enter the perio tissues via foramina 2. Then the path of drainage is due to anatomy 3. The dense buccal and lingual cortical plates often prevent a sinus tract forming and force drainage up through the PDL 4. The isolated pocket mimics a crack - so how can we tell the difference between a chronic abscess draining through the PDL due to anatomy and a crack that is a lateral exit and drains up because the location of the

Root Canal and abscess Treatment | Medical Arts