The stability of segments after Le Fort I osteotomy first attracted the researcher&am... more The stability of segments after Le Fort I osteotomy first attracted the researcher's interest when the surgical concept was conceived. Prebent plates are the ultimate modification of plate systems in craniofacial surgery; they have two right angles and are available in different lengths for use in maxillary advancement surgery. For this research, cone-beam computed tomography (CBCT) images of a male patient were obtained and scanned, and a 3D maxillary bone was created. Conventional Le Fort I osteotomies with 5 and 10 mm advancements were performed on both the cortical and trabecular bone using the Surgical Simulation Module of Mimics software; 1.7 mm Leibinger standard orthognathic 5-hole L plates and 1.7 mm Leibinger orthognathic advancement 11-hole prebent plates were adapted to the fragments. Displacement of the segment, the von Mises (VM) stresses (on the titanium miniplates) and the maximum principal (MP) stresses (on the bone) were evaluated for each configuration. Prebent plates offer a good alternative to the conventional two plate system, except in operations where maxillary advancement exceeds 5 mm. Surgical procedures that include advancement exceeding 5 mm or vertical position changes remain controversial and further studies are needed.
We present the case of a 23-year-old woman with aggressive fibromatosis of the oropharynx that wa... more We present the case of a 23-year-old woman with aggressive fibromatosis of the oropharynx that was initially treated elsewhere as a peritonsillar abscess. We discuss the characteristics of this rare tumor and review the literature, stressing the importance of postoperative follow-up for peritonsillar abscesses to avoid missing other important diagnoses, such as the one described here.
Subcutaneous emphysema is the condition in which air or other gases penetrate the skin and submuc... more Subcutaneous emphysema is the condition in which air or other gases penetrate the skin and submucosa causing soft-tissue distention. This type of emphysema may be traumatic, iatrogenic or may occur spontaneously. This report describes the youngest case of subcutaneous emphysema related to dental treatment that has been documented to date. In addition to the patient's age, the case is of interest because subcutaneous emphysema is a rare complication of dental therapy.
The International Journal of Medical Robotics and Computer Assisted Surgery, 2007
The purpose of the present study was to evaluate the accuracy of a computer-assisted imaging syst... more The purpose of the present study was to evaluate the accuracy of a computer-assisted imaging system in predicting the soft tissue response following orthognathic surgery. The study sample consisted of 11 adult patients with a mean age of 23.5 years. The preoperative and postoperative lateral cephalograms were obtained after orthodontic preparation and immediately before surgery and at least 1 year after surgery. The computer-generated soft tissue image and the actual surgical outcome were compared to evaluate the accuracy of the imaging system. In the sagittal plane, the tip of nose was the most accurate site and the largest difference was shown in the upper lip. The lower lip was noted to be the least accurate and the subnasale the most accurate region in the vertical plane. Predictions were found to be more accurate for the sagittal plane when compared with those for the vertical plane. Computer-assisted visual treatment objectives was proved to be satisfactory in predicting the soft tissue outcome following orthognathic surgery.
The stability of segments after Le Fort I osteotomy first attracted the researcher&am... more The stability of segments after Le Fort I osteotomy first attracted the researcher's interest when the surgical concept was conceived. Prebent plates are the ultimate modification of plate systems in craniofacial surgery; they have two right angles and are available in different lengths for use in maxillary advancement surgery. For this research, cone-beam computed tomography (CBCT) images of a male patient were obtained and scanned, and a 3D maxillary bone was created. Conventional Le Fort I osteotomies with 5 and 10 mm advancements were performed on both the cortical and trabecular bone using the Surgical Simulation Module of Mimics software; 1.7 mm Leibinger standard orthognathic 5-hole L plates and 1.7 mm Leibinger orthognathic advancement 11-hole prebent plates were adapted to the fragments. Displacement of the segment, the von Mises (VM) stresses (on the titanium miniplates) and the maximum principal (MP) stresses (on the bone) were evaluated for each configuration. Prebent plates offer a good alternative to the conventional two plate system, except in operations where maxillary advancement exceeds 5 mm. Surgical procedures that include advancement exceeding 5 mm or vertical position changes remain controversial and further studies are needed.
We present the case of a 23-year-old woman with aggressive fibromatosis of the oropharynx that wa... more We present the case of a 23-year-old woman with aggressive fibromatosis of the oropharynx that was initially treated elsewhere as a peritonsillar abscess. We discuss the characteristics of this rare tumor and review the literature, stressing the importance of postoperative follow-up for peritonsillar abscesses to avoid missing other important diagnoses, such as the one described here.
Subcutaneous emphysema is the condition in which air or other gases penetrate the skin and submuc... more Subcutaneous emphysema is the condition in which air or other gases penetrate the skin and submucosa causing soft-tissue distention. This type of emphysema may be traumatic, iatrogenic or may occur spontaneously. This report describes the youngest case of subcutaneous emphysema related to dental treatment that has been documented to date. In addition to the patient's age, the case is of interest because subcutaneous emphysema is a rare complication of dental therapy.
The International Journal of Medical Robotics and Computer Assisted Surgery, 2007
The purpose of the present study was to evaluate the accuracy of a computer-assisted imaging syst... more The purpose of the present study was to evaluate the accuracy of a computer-assisted imaging system in predicting the soft tissue response following orthognathic surgery. The study sample consisted of 11 adult patients with a mean age of 23.5 years. The preoperative and postoperative lateral cephalograms were obtained after orthodontic preparation and immediately before surgery and at least 1 year after surgery. The computer-generated soft tissue image and the actual surgical outcome were compared to evaluate the accuracy of the imaging system. In the sagittal plane, the tip of nose was the most accurate site and the largest difference was shown in the upper lip. The lower lip was noted to be the least accurate and the subnasale the most accurate region in the vertical plane. Predictions were found to be more accurate for the sagittal plane when compared with those for the vertical plane. Computer-assisted visual treatment objectives was proved to be satisfactory in predicting the soft tissue outcome following orthognathic surgery.
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Papers by Ulkem Cilasun