In general, subperiosteal implants tend to be less affordable than endosteal implants. This is because subperiosteal implants are custom-made to fit each patient's jaw, which requires more time and resources than the process of placing an endosteal implant into the jawbone.
Additionally, subperiosteal implants are typically used in cases where there is insufficient bone in the jaw to support an endosteal implant, which may require additional procedures such as bone grafting or sinus lifting, further increasing the cost.