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 As per Anderson and D'Alonzo classification the most dangerous type of odontoid fracture is and explain in detail?
Anderson and D'Alonzo classification for odontoid fracture 
Type I : Avulsion of tip .
Type II : Fracture at junction of odontoid process and axis.
Type III : Fracture through the body of axis.
Treatment according to classification 
Type I : Conservatively
Type II : Most dangerous type, treated with screw fixation
Type III : Conservatively