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Fig. 4 | International Journal of Implant Dentistry

Fig. 4

From: Immediate implant-retained prosthetic obturation after maxillectomy based on zygomatic implant placement by 3D-guided surgery: a cadaver study

Fig. 4

Overview of the several types of measurements and reference planes or coordinate systems for assessing the accuracy of zygomatic implant placement derived from post-op CBCT. In red, the planned zygomatic implant position; in blue, the postoperative zygomatic implant position. Left: the implant coordinate system (ICoS) including the three reproducible reference planes in which the accuracy is measured; the center of the zygomatic implant head, bone entry point of the implant, and bone exit point of the implant. Middle: 3D angular deviation between 3D planned position and post-operative implant position. Right: occlusion plane coordinate system (OCoS). A plane parallel to the prosthetic occlusional plane is defined; perpendicular to this plane is the blue arrow. This arrow indicates the direction in which the abutment height accuracy is calculated

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