Kim et al classification system deals with

Kim et al classification of isthmus Classification of the isthmus : by Hus & Kim et al Type I - Is two or three canals with no notable communication. Type II - Is two canals that possess a definite connection between the two main canals. Type III - Is three canals that possess a definite connection between them. Type IV- Is when the canals extend into the isthmus area. Type V- Is the true connection or corridor throughout the section.