You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Kim et al classification system deals with: and explain in detail?
According to Kim et al Classification; there are 5 types

Type I incomplete isthmus between 2 canals.
Type II well defined, complete isthmus between 2 canals.
Type III very short but complete isthmus between 2 canals.
Type IV 3 or more canals with the complete or incomplete isthmus.
Type V 3 or more canals without any visible connection.