In my opinion every finger has a basic cylindrical shape with varying dimensions at various levels depending on which finger we are talking about and with different persons. Confirming your patients pre-morbid finger shape may possibly bring you very close to his ideal finger shape/type.

The prime requisite of a prosthesis should lean towards rehabilitation of function under the guise of looking normal. Having a mild edge taper will allow better approximation of the digits unless a specific functional requirement calls for a certain amount of specific splay/opening

best regards

DocP

the finger has a semi circular shape

Thank you Shaymaa for your answer

semi circular finger is good shape becuase it has good contact area

regards

Thanks Dr. Kahdim