STATEMENT OF PROBLEM: Long-term exposure of dental porcelain to saliva during temporary cementation of a porcelain-fused to metal (PFM) restoration could affect mechanical strength of dental porcelain if the restoration is refired. PURPOSE: This work was performed to verify the effect of water on the mechanical strength in aged dental porcelain. MATERIAL AND METHOD: 63 specimens(Vintage Metalbond opaque and opal powder) were distributed to three experimental groups; non-water immersed control, immersed and pedried, and immersed and non-predired groups. The changes in flexural strength and fracture toughness after specimen refiring related to Fourier Transform Infrared (FT-IR) spectroscopy. RESULTS: 1. The FT-IR reflectances assigned to molecular bonds of H2O were noted as significantly different between the first-fired group and three refired groups and between two water-immersed groups and control group after refiring( p<0.05). They were also significantly different between predried group and non-predried group after refiring( p<0.05). 2. For opal specimens, FT-IR absorbances for hydrogen bond of H2O and silanols were significantly higher in non-predried group than in predreid group( p<0.05). 3. Predried opal group showed the highest mean flexural strength( p<0.05). Non-predried group indicated higher mean flexural strength than control group( p<0.05). 4. The mean fracture toughness for predired group was higher than non-predried group( p<0.05). 5. The difference of leucite crystal size is noted between control group and water-immersed, predried group in scanning electron microscopic study(x10000).
Cementation ; Dental Porcelain* ; Fourier Analysis ; Hydrogen ; Saliva ; Spectrum Analysis ; Water*

Interferons(IFNs) exhibit an antiproliferative effect on many normal and transformed cells and have in vivo antitumor activity in a variety of cancers. Recent clinical studies have suggested major activity with IFNs, especially in advanced squamous cell carcinoma of the skin and cervix. With the objective of exploring how the IFNs might work in squamous carcinoma cell line, we studied the effect of IFN-a on cervical cancer cell lines. The effect of IFNs on apoptosis and cell cycle of cervical cancer cell lines(C33A, CaSki, SiHa, HeLa, ME-180) was analysed by flow cytometry in time dependent manner. Results were as follows: (1) According to cell count of studied cancer cell lines treated with 2,000 IU/ml IFN-a for 7 days exposure, IFN-a had the antiproliferative effect on all five tested cervical cancer cell lines. Also this antiproliferative effect was confirmed by WST-1 assay. (2) The effect of IFN-a on apoptosis of each cultute was analysed by flow cytometry after 3 days and 7 days exposure with 2,000 IU/ml IFN-a, Apoptosis was not induced by IFN-a treatment. (3) The effect of IFN-a on the cell cycle of each culture was analysed by flow cytometry after 3 days exposure with 2,000 IU/ml IFN-a. As compared to control cells, treatment with IFN-a resulted in a higher proportion of cells in S phase with lower portion of cells with G2/M phase. (4) Time course of IFN-a effect on HPV 16 and HPV 18 E6 mRNA levels was evaluated by northern blot analysis. In CaSki cell line, HPV 16 E6 mRNA expression induced by IFN-a was not inhibited. But in HeLa cell line, HPV 18 E6 inRNA expression was inhibited. IFN-a appears to have the antiproliferative effect on all five tested cervical cancer cell lines and the antiproliferative effect of IFN-a seemed to be induced not by apoptosis but by disruption on specific cell cycle. Also regulation of HPV E6 mRNA expression induced by IFN-a is not directly related to the mechanisms of the antiproliferative effect of IFN-a in cancer cell lines.
Apoptosis ; Blotting, Northern ; Carcinoma, Squamous Cell ; Cell Count ; Cell Cycle ; Cell Line* ; Cervix Uteri ; Female ; Flow Cytometry ; HeLa Cells ; Human papillomavirus 16 ; Human papillomavirus 18 ; Humans ; RNA, Messenger ; S Phase ; Skin ; Uterine Cervical Neoplasms*

Human mitochondrial DNA (mtDNA) is generally used to identify highly degraded forensic samples, particularly when the extracted DNA is not sufficient for nuclear DNA analysis. However, direct sequencing, the most widely used mtDNA analysis method, is laborious and time-consuming, and precludes the simultaneous analysis of many samples. Here, we describe a rapid and simple screening method for mtDNA analysis in Koreans using single base extension (SBE) methods. Sixteen highly polymorphic mtDNA SNPs from the control region were selected, and a multiplex SBE system was constructed to analyze them. Because the developed system consists of two duplex PCRs, which produce small amplicons with fewer than 270 bp, it works well with highly degraded samples such as old skeletal remains. Using this multiplex SBE system, 145 different haplotypes were expected to be observed from 593 unrelated Koreans. Seventy-three haplotypes were expected to be observed only once, and the most frequent haplotype was expected to occur 80 times. Since the mean number of pairwise differences was estimated to be 4.55, the developed system could be useful to exclude samples that do not match evidence and reference samples. Therefore, the multiplex SBE system used in this study will be a useful tool to analyze many samples simultaneously and to efficiently screen out non-matching mtDNA sequences in forensic casework.
Asian Continental Ancestry Group ; DNA ; DNA, Mitochondrial* ; Haplotypes ; Humans ; Mass Screening* ; Methods ; Polymerase Chain Reaction ; Polymorphism, Single Nucleotide*

Fournier's gangrene is an infective necrotizing fasciitis of the perineal, genital or perianal regions. Management of this disease has involved prompt surgical debridement with initiation of broad spectrum antibiotics and intensive supportive care. Multiple debridements orchiectomy, urinary deversion, and fecal diversion should be performed as clinically indicated. Hyperbaric oxygen therapy and topical application of unprocessed honey may prove to be useful adjuncts as new therapies. After excision of all necrotic tissue, the tissue losses have been managed by primary repair. split-thickness skin grafts, rotational or free myocutaneous flaps and omental flaps. Skin graft did not take on bare testis lacking the tunica vaginalis, and gracilis myocutanous flap was too bulky to cover the scrotal area. The progress of necrosis ceased by using intravenous PGE1 injection in the aspect of characteristic obliterative endarteritis causing cutaneous and subcutaneous vascular thrombosis and necrosis of tissue in Fournier's gangrene. We have reconstructed large scrotal defects with bilateral superomedial thigh flap in three Fournier's gangrene patients after stopping tissue necrosis with PEG1 treatment and several surgical debridements of the wounds. The use of this flap ensures a virtually normal sensation, which is important for the erotic propensity of the scrotum. Easy flap design and dissection, as well as primary closure of the donor site, are another benefits of this method.
Alprostadil* ; Anti-Bacterial Agents ; Debridement ; Endarteritis ; Fasciitis, Necrotizing ; Fournier Gangrene* ; Honey ; Humans ; Hyperbaric Oxygenation ; Myocutaneous Flap ; Necrosis ; Orchiectomy ; Scrotum ; Sensation ; Skin ; Testis ; Thigh* ; Thrombosis ; Tissue Donors ; Transplants ; Wounds and Injuries

OBJECTIVES: The purpose of this study was to determine the clinical significance of residual amniotic fluid volume, as measured by the amniotic fluid index(AFI), on the prediction of latency period and perinatal outcomes in patients with preterm premature rupture of the membranes(PPROM). METHODS: Study population consisted of 103 singleton pregnancies with PPROM between 24 and 34 weeks' gestation. Amniotic fluid index was determined using transabdominal ultrasound at admission. Latency period was defined as time interval in hours between admission and delivery. All medical records of mothers and neonates were reviewed. Spearman's rho rank correlation, receiver-operator characteristic(ROC) curve analysis, survival analysis and Cox's proportional hazard model were used for statistical analysis. RESULTS: There was a statistically significant correlation between latency period and AFI at admission. ROC curve analysis showed that AFI at admission had a significant predictive value in the prediction of latency period < 48 hours. Survival analysis demonstrated that AFI < 5.0 was strongly associated with the likelihood of shorter latency period, Cox's proportional hazard model indicated that AFI < 5.0 was a significant independent predictor for the occurrence of latency period < 48 hours even after adjustment of other independent variables. The patients with AFI <5.0 had a higher rate of cesarean section due to fetal distress than those with AFI > 5.0 but the incidence of chorioamnionitis was not significantly different between two groups. Comparing the perinatal mortality and neonatal morbidity including infectious morbidity between the neonates born to mothers with AFI <5.0 and those with AFI > 5.0, there was no significance after adjustment of gestational age at birth. CONCLUSION: AFI at admission has a significant correlation with latency period and predictive value in prediction of latency period in the patients with PPROM. AFI <5.0 is a independent predictor for the shorter latency period.
Amniotic Fluid* ; Cesarean Section ; Chorioamnionitis ; Female ; Fetal Distress ; Gestational Age ; Humans ; Incidence ; Infant, Newborn ; Latency Period (Psychology)* ; Medical Records ; Membranes* ; Mothers ; Parturition ; Perinatal Mortality ; Pregnancy ; Proportional Hazards Models ; ROC Curve ; Rupture* ; Ultrasonography

The variations of the occipital sinus were studied in 50 Korean adult cadavers. The morphology of the sinus was classified into 5 types accordingo to its number and the connection with the marginal sinus. These results were compared with the data of the occipital sinus of bones (Sir and Chung, 1907). And the opening of the occipital sinus in the confluens sinuum was observed. 1. A single small occipital sinus was found in 40%. Single occiital sinus with two large marginal sinuses was observed in 8%. The single sinus with a left marginal sinus (6%) and with a right marginal sinus(4%) were present. Double occipital sinuses were observed in 10% of the cadavers. No occipital sinus was discernible in 32%. 2. There were 39 openings of the occipital sinus including the double sinuses. The occipital sinuses communicated with the confluence sinuum in 35 cases (89.7%), with the straight sinus in 5.1% and with the right or left transverse sinus in 1 case, respectively. The openings in the confluens sinuum were found on the left side(51.3%), on the right side (10.3%) and in the center(28.2%). 3. The diameters of the occipital sinus were variable according to the connection with the sigmoid sinus. 4. The difference was found between the data of the morphological types of the occipital sinus that were studied in cadavers and in dry bones.
Adult* ; Cadaver ; Colon, Sigmoid ; Humans

OBJECTIVES: The aim of this study was to evaluate the differences in patients with positional dependent sleep apnea according to their non-supine apnea-hypopnea index (AHI, > or =5 vs. <5). METHODS: 92 patients with positional sleep apnea were evaluated. The patients were divided into two groups : group I was non-supine AHI having > or =5 ; group II was non-supine AHI having less than 5. Statistical analysis was performed to find the difference between two groups. RESULTS: In 92 patients, the number of group I patients was 11 (12%) and the number of group II patients was 81 (88%). In the severe AHI group, percentage of group I was dominated (70%) and showing a significant difference compared with the mild and moderate AHI groups (p<.05). In the severe body mass index (BMI) group, percentage of group I was dominated (54.5%) and showing a significant difference compared with of the mild and moderate BMI groups (p<.05). The percentage of group I was significantly higher than group II (p<.05) in the AHI, supine AHI, non-supine AHI and snore time. CONCLUSIONS: In patients with positional sleep apnea, severe OSA and high BMI are more common in patients with non-supine AHI> or =5 than non-supine AHI<5.
Body Mass Index ; Humans ; Sleep Apnea Syndromes ; Sleep Apnea, Obstructive

This is a report of the clinico-pathologic findings in six cases of histologically verified malignant meningiomas-three hemangiopericytic and three anaplastic types. They were three males and three females and two of them were reoperated for recurrence. The hemangiopericytic types had similar angiographic and macroscopic features and malignant characteristics such as increased mitoses. The anaplastic types lacked typical arrangement, but had a large number of mitoses, increased cellularity, focal necrosis, pleomorphism, anaplasia, and the adjacent normal parenchymal infiltration. However the metastasis was not yet proven in these cases.
Female ; Male ; Humans ; Neoplasm Metastasis

This is a report of the clinico-pathologic findings in six cases of histologically verified malignant meningiomas-three hemangiopericytic and three anaplastic types. They were three males and three females and two of them were reoperated for recurrence. The hemangiopericytic types had similar angiographic and macroscopic features and malignant characteristics such as increased mitoses. The anaplastic types lacked typical arrangement, but had a large number of mitoses, increased cellularity, focal necrosis, pleomorphism, anaplasia, and the adjacent normal parenchymal infiltration. However the metastasis was not yet proven in these cases.
Female ; Male ; Humans ; Neoplasm Metastasis

No abstract available.
Trigeminal Nerve*