Figure 6.

Three types (types (I), (II), and (III)) of position relationships between the implant and the maxillary sinus cavity. The starting point of IA on the alveolar crest was defined as point A. If the implant entered the sinus cavity, the point at which it first entered the sinus cavity was defined as point B. The point at which the implant was entirely inside the sinus was defined as point C, and the point at which the implant began to reenter bone was defined as point D. The point at which the implant exited the sinus wall and completely entered bone was defined as point E. The endpoint of IA was defined as point F.