Fig. 5
From: Endodontic access cavity preparation: challenges and recent advancements

a) The 26 requiring root canal treatment, with a significantly reduced pulp chamber, indicating higher complexity. b) The 36 with a reduced pulp chamber, also indicating additional complexity. Note the gutta-percha cone showing the ___location that the sinus tract is originating from. The reduced sized pulp chambers increase the complexity of treatment due to increased risk of iatrogenic damage including perforation