(J Korean Assoc Oral Maxillofac Surg 2012;38:29-37) Introduction: Fibrous-osseous lesions of the jaws are difficult to diagnose precisely until excised biopsy results are found, so they might be confused with malignant lesions. This clinical study focused on the diagnostic aids of lesions that demonstrate different clinical, radiologic, and histological findings. Materials and Methods: A total of 16 patients with benign fibrous-osseous lesions on the jaws (6 fibrous dysplasias, 6 ossifying fibromas, 3 cemental dysplasias, and one osteoblastoma) were reviewed. Nine patients with malignant fibrous-osseous lesions (8 osteosarcomas and one Ewing's sarcoma) were also retrospectively reviewed. Results: Osteosarcoma patients complained of facial swelling and tooth mobility. The radiographic findings showed the irregular resorption of cortical bone and periosteal reactions. Histological features included cellular pleomorphism and atypical mitosis. An Ewing's sarcoma patient complained of tooth mobility and facial swelling. Onion-skin appearance and irregular expansile marginal bony radiolucency were seen in the radiography. Fibrous dysplasia patients complained of facial swelling and asymmetry. The radiographic features were mostly ground-glass radiopacity. Histological findings showed a bony trabeculae pattern surrounded by fibrous ground substances. Ossifying fibroma patients complained of buccal swelling and jaw pains, showing expanded cortical radiolucent lesions with a radiopaque margin. Histological findings were revealed as cellular fibrous stroma with immature woven bones. In cemental dysplasia, most of their lesions were found in a routine dental exam. Well-circumscribed radiopaque lesions were observed in the radiography, and cementum-like ossicles with fibrous stroma were seen in the microscopy. An osteoblastoma patient complained of jaw pain and facial swelling. Radiographic findings were mottled, dense radiopacity with osteolytic margin. Trabeculae of the osteoid with a vascular network and numerous osteoblasts with woven bone were predominantly found in the microscopy. Conclusion: Our study showed similar results as other studies. We suggest the clinical parameters of diagnosis and treatment for malignant and benign fibrous-osseous lesions of the jaws.

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The magnetoelectric (ME) properties of Tb0.3Dy0.7Fe1.92 (Terfenol-D)/PbZr0.3Ti0.7O3 (PZT) thin films grown on a Pt(111)/Ti/SiO2/Si(100) substrate were investigated. The ferroelectric behavior of a Terfenol-D/PZT bilayer film stack was examined by polarization–electric field hysteresis measurement. The remnant polarization (P r) and coercive field (E c) values were found as 31 µC/cm2 and 124 kV/cm, respectively. The magnetic behavior was observed using a vibration sample magnetometer (VSM) at 300 K with saturation magnetization (M s) and coercivity (H c) values of 6.7 emu/cm3 and 70 Oe, respectively. The application of magnetic field caused a piezomagnetic strain in the Terfenol-D layer hence, the piezoelectric voltage or charge in the PZT thin film was induced. The maximum magnetoelectric voltage coefficient (d E/d H) value of approximately 40 mV cm-1 Oe-1 was obtained at the magnetic field of 5 kOe.