No abstract available.

No abstract available.
Adenoma, Pleomorphic ; Mouth Mucosa

No abstract available.

No abstract available.
Carcinoma, Verrucous ; Lip

Adult ; Connective Tissue ; Extremities ; Head ; Histiocytoma, Malignant Fibrous ; Humans ; Maxilla ; Neck ; Radiotherapy ; Sarcoma

As jaws of children differ from those of adults in the aspects of architectural and mechanical properties, site, form and treatment modality of pediatric fractured jaws are somewhat different from those of adults. This study takes stastics of 33 pediatric patients with mandibular fractures (55 fracture sites) who were admitted to the department of oral and maxillofacial surgery. Kyung-hee university from May 1986 to March 1995, aged up to 15years with primary or mixed dentition, by age, cause, site and treatment modality. The results are as follows. 1. The mandibular fracture has sexual predilection for male, 0 to 3 years group. 2. The main cause of mandibular fracture is falling from various position, followed by traffic accident. 3. The highest incidence of fracture site is symphysis and/or condyle area. 4. Circumferential wiring is widely used for pediatric mandibular fracture.
Accidents, Traffic ; Adult ; Child ; Dentition, Mixed ; Humans ; Incidence ; Jaw ; Male ; Mandibular Fractures* ; Surgery, Oral

Carcinomas derived from ameloblastomas have been designated by a variety of terms, including malignant ameloblastoma, ameloblastic carcinoma, metastatic ameloblastoma, and primary intra-alveolar epidermoid carcinoma. The term of ameloblastic carcinoma is differentiated from the term of malignant amelblastoma and is defined as an ameloblastoma in which there is histologic evidence of malignancy in the primary tumor or the recurrent tumor(or metastasis), regardless of whether it has metastasized. The well-documented and adequately followed cases are currently lacking and this report described an instance of ameloblastic carcinoma with good result after treatment and review of literature.
Ameloblastoma ; Ameloblasts* ; Carcinoma, Squamous Cell ; Mandible*

Retinal prostheses are being developed to restore vision for the blind with retinal diseases such as retinitis pigmentosa (RP) or age-related macular degeneration (AMD). Since retinal prostheses depend upon electrical stimulation to control neural activity, optimal stimulation parameters for successful encoding of visual information are one of the most important requirements to enable visual perception. Therefore, in this paper, we focused on retinal ganglion cell (RGC) responses to different voltage stimulation parameters and compared threshold charge densities in normal and rd1 mice. For this purpose, we used in vitro preparation for the retina of normal and rd1 mice on micro-electrode arrays. When the neural network of rd1 mouse retinas is stimulated with voltage-controlled pulses, RGCs in degenerated retina also respond to voltage amplitude or voltage duration modulation as well in wild-type RGCs. But the temporal pattern of RGCs response is very different; in wild-type RGCs, single peak within 100 ms appears while in RGCs in degenerated retina multiple peaks (~4 peaks) with ~10 Hz rhythm within 400 ms appear. The thresholds for electrical activation of RGCs are overall more elevated in rd1 mouse retinas compared to wild-type mouse retinas: The thresholds for activation of RGCs in rd1 mouse retinas were on average two times higher (70.50~99.87micronC/cm2 vs. 37.23~61.65micronC/cm2) in the experiment of voltage amplitude modulation and five times higher (120.5~170.6micronC/cm2 vs. 22.69~37.57micronC/cm2) in the experiment of voltage duration modulation than those in wild-type mouse retinas. This is compatible with the findings from human studies that the currents required for evoking visual percepts in RP patients is much higher than those needed in healthy individuals. These results will be used as a guideline for optimal stimulation parameters for upcoming Korean-type retinal prosthesis.
Animals ; Electric Stimulation ; Fees and Charges ; Humans ; Macular Degeneration ; Mice ; Retina ; Retinal Diseases ; Retinal Ganglion Cells ; Retinaldehyde ; Retinitis Pigmentosa ; Vision, Ocular ; Visual Perception ; Visual Prosthesis

No abstract available.
Calcinosis* ; Humans ; Infant*

This is a retrospective study on condylar fracture of mandible. The stucy based on a series of 112 patients who had treated for the fractures of mandibular condyle on Kyunghee Dental Hospital from January, 1989 to August 1997. We studied the age and sex distributions, causes of fractures, location of fractures and so on. The results as follow : 1. The ratio of male : female was 4:1, and the highest frequency of condylar fractures was registered among patients aged to 21 to 30 years. 2. The most common cause of condylar fractures was fall-down(47.7%), followed in incidence by direct-blow(27.9%) and traffic accidents(20.7%). 3. Subcondylar fracture had highest incidence(50%), and followed by condyle head(27.4%) and condylar neck(22.6%). 4. 9.7% of condylar fractures had occurred bilaterally and in cases of bilateral condylar fractures, condylar head fractures(58.33%) was hightest incidence. 5. Mandibular symphysis was most commonly involved in condylar fracture(63.4%), and 27.7% of condylar fractures had not any other mandibular fractures.
Female ; Head ; Humans ; Incidence ; Male ; Mandible* ; Mandibular Condyle ; Mandibular Fractures ; Retrospective Studies ; Sex Distribution ; Statistics as Topic*