After upper posterior teeth are lost the maxillary sinus cavity has a tendency to pneumatize or "bubble down" and the molar extraction site alveolar bone starts to atrophy. This results in a situation where there can be inadequate bone height to place a dental implant. There is a common procedure that can be done to create additional bone height and result in an adequate receptive site to place a tooth implant and return the option of having attached permanent teeth again. Otherwise, the patient would be relegated to wearing a removable partial or having a dental bridge.

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