Objective. This study aimed to define CBCT as a technique for postimplantation in vivo examination of porous hydroxyapatite\r\nand aluminium-oxide orbital implant shape, volume and density changes. Methods and Materials. CBCT was used to evaluate\r\n30 enucleated patients treated with spherical polyglactin 910 wrapped hydroxyapatite and aluminum-oxide orbital implants. The\r\nmean duration of patient followup was 3.2 years or 1338 days with a range of 0.2 to 7.2 years or 79 to 2636 days in a population\r\nwith an average age of 40.8 years. Results. The resolution of currently clinically used CBCT equipment allowed detailed structural\r\nobservation of the orbital hydroxyapatite implants with some modifications. Volume and shape estimations were possible while\r\ndensity evaluation was more complicated compared to medical source computed tomography. The mean densities of the orbital\r\nimplants were followed and a consistent gradual decrease identified from the beginning of implantation which was better defined\r\nafter the applied correction procedure. Conclusion. CBCT with lower dosages of radiation exposure can be used to follow changes\r\nin implanted high-density porous structures. The density evaluation is possible with calibration modifications. Changes in orbital\r\nimplant densities identified in this study may correspond to healing and maturation of soft tissues surrounding and penetrating\r\nthe implants.
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