There are several reasons for a lack of bone:
– If you are missing teeth in the upper jaw of your mouth, for example, your back teeth or molars, you most likely will be lacking sufficient bone which is needed for the placement of dental implants.
– Lack of bone in the upper jaw can also be due to periodontal / gum disease.
– Tooth loss causes bone loss in the jaw. When a tooth falls out, the body begins to “resorb” or absorb the bone back into the body. If the teeth have been missing for some time, there may not be enough bone left in the jaw to place dental implants.
– If the upper jaw is too close to the maxillary sinus, implants cannot be placed.