1.The effects of spure and invents on the casting accuracy and porosity of ti-ni castings.
Lee Ra CHO ; Yang Jin YI ; Chan Jin PARK
The Journal of Korean Academy of Prosthodontics 2003;41(3):342-350
STATEMENT OF PROBLEM: Titanium-Nickel alloy might be used in various prosthetic restorations since it has a unique property such as super-elasticity and high fatigue resistance. However, little is known about the casting ability of this alloy. PURPOSE: This in vitro study compared the casting accuracy and the porosity made with different investments and various sprue designs to ascertain what casting condition would be better for the fabrication of Ti-Ni cast restorations. MATERIAL AND METHODS: A total of 70 Ti-Ni alloy crowns were made and divided into 7 groups of 10 copings on a metal master die. For measuring the effect of the sprue numbers, two groups with one and two 8-gauge sprues were compared. Moreover, the results of the conventional sprue and the double thickness sprues were compared. Three investments were used; carbon free phosphate bonded investment, titanium investment and gypsum bonded investment. The cast restorations were evaluated at 48 points on the entire circumferential margin with a stereomicroscope measuring in micrometers. Each crown was radiographically examined for casting defects and porosity. Data on casting accuracy were analyzed using two-way and Post hoc Scheffe's comparison to determine whether significant differences existed at the 95% confidence level. Student-Newman-Keuls test were performed to identify significant differences in the number of voids. RESULTS: The double sprueing group and double thickness group had significantly less marginal discrepancy than the single sprueing group (P<.05 and P<.01, respectively). The castings with phosphate bonded investment showed the least marginal discrepancy and the smoothest surface. The castings invested in the gypsum bonded investment had the greatest gaps in margin and the largest failure rate. The double sprueing group and phosphate bonded investment group had significantly smaller void numbers and smaller void size than the other groups. CONCLUSION: Within the limitations of this in vitro study, the casting accuracy of the groups using thicker, double sprue design and the phosphate bonded investment was significantly superior. Moreover, void number and size were less than other groups.
Alloys
;
Calcium Sulfate
;
Carbon
;
Celiac Disease
;
Crowns
;
Fatigue
;
Investments
;
Porosity*
;
Titanium
3.Clinical Comparison of the Scar Revision According to Two Different Intradermal and Skin Suture Technique.
Jeong Yeol YANG ; Seung Chan LEE ; Yang Soo KANG ; Keun Hong PARK ; Myung Ju LEE
Journal of the Korean Society of Aesthetic Plastic Surgery 2001;7(1):47-52
No abstract available.
Cicatrix*
;
Skin*
;
Suture Techniques*
;
Sutures*
4.Exogenous lipoid pneumonia after ingestion of shark liver oil: a case report.
Jae Bum YANG ; Hyeon Lim SEONG ; Chan Sup PARK ; Yang Hee PARK ; Sang Sun LEE
Journal of the Korean Radiological Society 1991;27(5):644-646
No abstract available.
Eating*
;
Liver*
;
Pneumonia*
;
Sharks*
5.Radiologic evaluation of wrist arthrography.
Yang Hee PARK ; Hyeun Lim SEONG ; Jae Beom YANG ; Chan Sup PARK ; Sang Seun LEE
Journal of the Korean Radiological Society 1991;27(3):393-398
No abstract available.
Arthrography*
;
Wrist*
6.Case of Decreased Serum Valproic Acid Concentration During Concomitant Use of Meropenem in Patients with Traumatic Brain Injury
Chan-Kyu JEONG ; Chan-Mo YANG ; Sang-Yeol LEE ; Seung-Ho JANG
Mood and Emotion 2022;20(3):65-67
Blood valproic acid levels were decreased in patients with traumatic brain injury who had been using valproic acid to control irritability and aggression, and the symptoms worsened coincident with the administration of meropenem, a carbapenem-based antibiotic. Two weeks after the discontinuation of meropenem, valproic acid levels were restored to an effective therapeutic concentration. Therefore, when valproic acid and carbapenem-based antibiotics are used together, blood valproic acid levels may decrease due to drug interaction, and irritability symptoms may worsen. Thus, close monitoring of serum valproic acid levels is required.
7.CT findings of rounded atelectasis.
Chan Wha LEE ; Kyu Ok CHOE ; Jong Doo LEE ; Eun Kyoung HAN ; Woo Ick YANG
Journal of the Korean Radiological Society 1991;27(2):231-235
No abstract available.
Pulmonary Atelectasis*
8.Polycystic ovary in torsion combined with stage in endometrial carcinoma.
Jung In YANG ; Suk Jung KIM ; Byung Seok LEE ; Dong Jei CHO ; Kook LEE ; Chan Ho SONG
Korean Journal of Obstetrics and Gynecology 1991;34(10):1481-1487
No abstract available.
Endometrial Neoplasms*
;
Female
;
Ovary*
9.The Effect of Ethanol on 3'-Methyl-4-dimethylaminoazobenzene Induced Carcinogenesis in Rat Liver.
Chan Il PARK ; Ho Guen KIM ; So Young JIN ; Woo Ick YANG ; Yoo Bock LEE
Korean Journal of Pathology 1991;25(1):21-29
This study is aimed to elucidate the biological nature of the precancerous lesions and to evaluate whether the ethanol alters 3'-Methyl-4-dimethylaminoazobenzene (3'-Me-DAB) induced experimental hepatocarcinogenesis. A total of 108 Sprague-Dawley male rats were used for the experiment and divided into 6 groups according to 3'-Me-DAB and ethanol administration. Administration of the drugs were carried out daily by nasogastric tube insertion and the animals were sacrificed at different interval. A part of right lateral lobe was prepared for the histological examination. Cell kinetics of the immunohistochemical method for bromodeoxyuridine (BrdU). The administration of 3'-Me-DAB induced oval cell proliferation, hyperplastic nodule, cholangiofibrosis and carcinoma in the liver. The mean labelling indices, the percentages of BrdU labelled cells, of hepatocytes were increased by administration of 3'-Me-DAB, only to reverse after cessation of the drug (2.58 vs 0.61). The labelling indices of the oval cells were also affected by the administration and cessation of 3'-Me-DAB (11.41 vs 4.48). In contrast, the cholangiofibrosis did not decrease but were still increasing following cessation of 3'-Me-DAB administration (4.37 vs 5.17 and 8.25 vs 11.29). These finding that the hyperplastic nodule and particularly the cholangiofibrosis have an autonomous proliferative potential and are definite precancerous lesions in the experimental hepatocarcinogenesis. Short term administration of ethanol decreased the incidence of development of the precancerous lesions, but did not affect the labelling indices in all the pathologic lesions of hepatocarcinogenesis.
Male
;
Humans
;
Rats
;
Animals
;
Incidence
10.Prenatal diagnosis of a fetus with recurrent translocation 21 trisomy by chorionic villus sampling.
Sei Kwang KIM ; Yong Won PARK ; Young Ho YANG ; Chan Ho SONG ; Myeong Seon LEE
Korean Journal of Obstetrics and Gynecology 1991;34(8):1158-1162
No abstract available.
Chorion*
;
Chorionic Villi Sampling*
;
Chorionic Villi*
;
Female
;
Fetus*
;
Pregnancy
;
Prenatal Diagnosis*
;
Trisomy*