Dimensional Study of Orbital Supporting Bone for Maxillo-facial Implants by Dental Computed Tomograms
This study aimed to determine the bone availability in various locations of the orbital region for craniofacial implants. Thirty dental computed tomograms of Thai volunteers (6 male and 24 female) were transformed to threedimensional images. The measurement was done in 3 bones of the orbital rims (Frontal bone, Maxillary bone and Zygomatic bone). Each bone was divided into 5 areas then the bone thickness at 3 levels was measured. The results showed that the thickness of orbital bone varied from 0.23 to 12.66 millimeters. The thickest area of the frontal bone was located at the lateral part, or lateral supraorbital rim (12.44±5.27 mm). The thickest area of the zygomatic bone was located at the middle, or lateral infraorbital rim (10.37±3.81 mm). For the maxillary bone, the thickest area was located at the middle, or medial infraorbital rim (5.02±1.60 mm). Since, maxillofacial implants provided nowadays require bone thickness of at least 3 mm, we can conclude that the maxillary bone is not suitable for implantation. Therefore, the implantable areas for orbital prosthesis are limited to the frontal and zygomatic bones. Moreover, the data from this study are valuable for designing maxillofacial implants for Thai people.
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