Which of the following statements about sinus bone grafts is TRUE?

The statement regarding sinus bone grafts aiming to increase sinus height is accurate and reflects the fundamental purpose of such procedures. Sinus bone grafts are primarily performed to augment the bone volume in the posterior maxilla when there is insufficient bone height to support dental implants. When planning for implants, especially longer endosteal implants, there is often a need to ensure that at least a portion of the sinus is filled with graft material to provide stable support for the implants.

In the context of implant placement, filling approximately one-third to half of the sinus cavity is generally considered a guideline to achieve optimal stability and integration of a 12 mm implant. Proper grafting leads to adequate alveolar bone formation, facilitating the successful placement of implants in areas where there is initial bone loss.

Other options reflect misconceptions about the indication and requirements for sinus grafting. While cosmetic improvement is a potential benefit, the primary aim is functional – to create a solid foundation for dental implants. Similarly, the necessity for grafting is not solely determined by the cosmetic aspect or the categorization of implants but rather by the volume of bone available and the specific clinical conditions present. Grafts can be crucial for achieving the required bone density and height to ensure a successful outcome in dental implant therapy.