Can I use 6 as abutment? Thinking of 4 tooth bridge as the best option

Hello in those circumstances mostly we prefer an implant supported fixed prostnesis rather than a removable partial. Connection between natural teeth and implants are mostly fragile and do not last long. Because implants are fused with jawbone but natural teeth are supported by ligaments and they move. That is why we are extracting the remaining teeth and place implants like an Allon4 for Allon6 mostly.